L6TE36 PD APR2026.docx

PURCHASE DESCRIPTION

Range #4 Modernization 17 April 2026

1. DESCRIPTION. The Contractor shall provide all the required data, special tooling, support equipment (SE), training, personnel requirements and facilities planning for rehosting of the Indoor Compact Antenna Range (ICAR) 4 System and to procure ICARMS #4 upgrades as a turnkey operation to the Electronics Maintenance Group (EMXG) at Robins Air Force Base (AFB), Georgia. The Contractor shall not change or modify any existing structural, enclosure, or real property like items to include the anechoic chamber, reflector, control room, floor slab, chamber Heating/Ventilation/Air Conditioning (HVAC), power, lighting, and fire protection, without express Government concurrence or approval.

1.1 Background. ICARMS #4 at Robins Air Force Base is a Scientific Atlanta (SA) System consists of the SA 5751 Compact range and SA 2041A Antenna Measurement System produced in the 1980’s.

1.1.1 The Scientific-Atlanta Model 5751 Compact Antenna Range allows antennas to be tested under far-field conditions at an indoor facility. Its size is approximately 20 x 40 feet. The system is capable of making gain, boresight, and pattern measurements for directive microwave antennas. The current range configuration enables direct measurement of the far-field radiation pattern of antennas up to four feet in diameter. The range consists of a large precision (192in x 186in) parabolic reflector, feed assembly, and the test antenna positioning system. Feed antennas operate over standard waveguide bands and transmit linearly polarized radiation. An adjacent room (Control Room) houses the data acquisition, data analysis, positioner control, and positioner display systems.

1.1.2 The SA Model 5751 Compact Antenna Range subsystems of interest for the ICARMS #4 upgrade are: Test Positioner Assembly; Feed Positioner Assembly; Wavefront Alignment Kit; and SA-2041A Antenna Measurement System.

1.1.3 The Test Positioner Assembly consists of a High Accuracy Polarization Positioner mounted on the SA Azimuth/Elevation Test Positioner atop a Slide Assembly. This provides a Roll-over-Azimuth-over-Elevation-over-Slide design. This system was installed with high-accuracy, dual-speed synchros to provide position feedback for each axis.

1.1.4 The Feed Positioner Assembly contains a motorized polarization rotator and a dual-speed synchro package. These items permit the signal feed antenna to be rotated about the longitudinal axis indicated. Using this polarization rotator, the linear polarization of the Model 5751 Compact Antenna Range electromagnetic field can be changed from horizontal to vertical, or vice versa, or a desired point between horizontal and vertical. The current Feed Polarization Positioner Assembly has a continuous range of travel.

1.1.5 The Wavefront Alignment Kit consists of a Nion Model 6B Brightfield Auto-Collimator mounted on an adjustable alignment fixture located atop the mast assembly. The mast assembly includes a mounting tower that is rigidly attached to the floor with a precision ground flat steel plate and mounting hardware. The Wavefront Alignment Kit also consists of a precision mirror tilt assembly attached to the rear of the SA-5751 Polarization Positioner. The Wavefront Alignment Kit is used to align the range’s optical/mechanical reference to the wavefront normal of the range’s electromagnetic axis.

1.1.6 The Scientific-Atlanta 2041A Antenna Measurement System allows for the reception of measurement data from an antenna under test (AUT). The SA-2041A Antenna Measurement System consists of three major subsystems: transmit system; receiving system; and positioning system. The transmit subsystem consists of a SA-2150B Microwave Signal Source and SA-2185 Microwave Frequency Synthesizer. The receiving subsystem consists of a SA-1783 Programmable Microwave Receiver. The positioning subsystem consists of a SA-2012 Positioner Programmer, SA-1842 Digital Synchro Display unit, and SA-4180 Positioner Controller and SCR unit. The SA-4180 Positioner Controller and SCR unit provide motor control for all 5 axes: Azimuth; Elevation; Antenna Roll; Floor Slide; and Feed Polarization. The SA-2041A Antenna Measurement System contains a SA-1580 Pattern Recorder to provide permanent plotted records of the AUT.

1.2 Detail the Commodity/Deliverables:

1.2.1 The Contractor shall provide new supplied components, parts, equipment, and items unless prior approval to use other items is obtained from the PCO and the Government engineering team. The Contractor shall accomplish the ICARMS #4 modernization effort within 24 months after receipt of order.

1.2.2 All upgrades and supplied equipment shall be compatible and operable with the current ICARMS #4 facility power delivery system.

1.2.3 Contractor shall deliver a fully integrated and operational upgraded facility to the Government in accordance with (IAW) this document.

1.2.4 The Contractor shall design the upgrades for modularity by using commercial and open architecture standards to the maximum extent possible to facilitate and maximize system maintainability.

1.2.5 The Contractor shall implement upgrades using system proven but current generation commercially available equipment.

1.2.6 The Contractor shall provide data (quantities and types) as specified in this document.

1.2.7 The Contractor shall propose an upgrade plan designed to minimize contiguous range down time to the maximum extent possible.

1.3 Signal Source System

1.3.1 The current signal source system (SA-2050B Signal Source System, SA-2185 Microwave Frequency Synthesizer, and all ancillary equipment) is to be replaced with modern COTS equipment.

1.3.2 The upgraded signal source system shall contain a synthesized, frequency agile source using a list mode or equivalent and shall be interconnected to the receiver subsystem so that phase-lock is maintained while performing high speed, multiple-frequency measurements.

1.3.3 The signal source subsystem shall have the following minimum frequency step size, resolution, and stability:

· Power Output Level: -20 dBm to +15 dBm

· Resolution: < 0.01 Hz;

· Temperature Stability: 1 x 10-10 per degree Celsius

· Initial Accuracy: ±50 ppb max

· Adjustable phase offset: < 1 degree per step.

1.3.4 The signal source subsystem shall have a frequency range of UHF to Ku bands with optional future coverage ranging from 50 MHz to 100 GHz.

1.3.5 The signal source subsystem shall have a 40 μs or less frequency switching speed.

1.3.6 The signal source subsystem shall contain internal leveling that levels the output signal to within +/- 1 dB/octave band.

1.3.7 The signal source subsystem shall have a spectral purity of -25 dBc or better from UHF to Ku bands with related non-harmonic level less than -40 dBc. Phase noise shall not exceed -100 dBc/Hz at 1 kHz offset at 10 GHz.

1.3.8 The signal source subsystem shall have a dedicated digital data input/output bus to/from the ICARMS #4 host instrument controller to allow for rapid frequency change and status monitoring.

1.3.9 The signal source subsystem shall be furnished complete with all miscellaneous parts, i.e. directional couplers, mixers, cables, switching units, et al. to accommodate the antenna testing as defined in this document as well as general purpose antenna measurements. Except for that which is internal to established COTS equipment braided outer conductor semi-rigid RF cables shall not be used in the signal source subsystem.

1.3.10 The signal source subsystem shall contain additional rack space for future frequency coverage.

1.4 Receiver System

1.4.1 The current receiver system (SA-1783 Microwave Receiver System and all ancillary equipment) is to be replaced with modern COTS equipment.

1.4.2 The ICARMS #4 shall contain a modern Commercial-off-the-Shelf (COTS) receiver subsystem that meets or exceeds (as required by contractor’s specific design) the following performance characteristics:

· Dynamic Range with S/N = 1:

· 78 dB minimum, without sample averaging for UHF to Ku bands

· 89 dB minimum, with sample averaging for UHF to Ku bands

· Frequency Range:

· UHF to Ka (primary receiver range of interest)

· Accuracy:

· Amplitude:

· Linear mode:

· 1 percent of full scale

· Logarithmic mode:

· Full Scale to -3 dB:

· 0.02 dB

· Full Dynamic Range:

· 0.05 dB/10 dB

· Circularity Error:

· Less than 0.001 dB

· Phase:

· 0.4 degrees/10 dB (over full dynamic range)

· Resolution (operator selectable):

· Low .1 percent (Linear) or .1 dB amplitude (Logarithmic); 1 degree phase

· Medium 0.01 percent (Linear) or 0.01 dB (Logarithmic), .1 degree phase

· High 0.001 percent (Linear) or 0.001 dB (Logarithmic), 0.01 degree phase

1.4.3 Multiple Frequencies: Receiver shall process and store single channel data for 500 frequencies minimum.

1.4.4 Measurement Channels: 4 plus reference (5 total); Channels shall operate simultaneously

1.4.5 Measurement Speed: The dynamic range of the receiver subsystem shall not be adversely affected by the operating speed. For a single frequency measurement, the receiver subsystem shall measure and process data for four (4) channels in a time span of 1/1200 second or less.

1.4.6 The receiver subsystem shall allow for mixer leveling for both the signal and reference mixers. Mixer leveling current and mixer shall be optimized for the UHF to Ku bands and shall not reduce the overall system data acquisition speed.

1.4.7 The receiver subsystem shall have 4 channels and control the multiplexing of 3 RF signal channels minimum. The receiver subsystem shall allow multiplexing of 3 RF signal channels minimum from the UUT. This capability shall not degrade system performance. Reference channel to signal channel isolation shall be 100 dB minimum (at reference channel input of -40 dBm). Signal channel to signal channel isolation shall be 100 dB minimum.

1.4.8 The receiver subsystem shall allow for UUT signals, 3 minimum, to be fed to a single mixer connected to the receiver Local Oscillator (LO) via a single coaxial cable to minimize phase and amplitude errors that could be induced by multiple low-loss cables for each test channel. An internal LO source receiver subsystem shall be configurable to alternatively operate with external LO source. Channel multiplexers shall operate in transmit or receive mode.

1.4.9 The receiver subsystem shall have a usable operating frequency range of 50 MHz to 100 GHz with appropriate mixers and/or up/down converters.

1.4.10 The receiver subsystem shall, at the operator’s option, normalize each individual data channel and all data channels to any one of the other data/reference channels.

1.4.11 The receiver subsystem shall have each signal and reference channel's output selectively displayed. Each output shall be displayed in linear, and logarithmic format at the user's discretion. The product and ratio of any 2 (minimum) of the channels shall be available on any or all of the outputs.

1.4.12 The receiver shall have the capability of storing and recalling a minimum of 8 front panel configurations to simplify UUT testing.

1.4.13 The receiver subsystem shall have both a frequency list mode and arbitrary mode for multiple frequency operation.

1.4.14 The receiver subsystem shall have a high speed (500 frequencies per second minimum) frequency switching capability to maximize test efficiencies.

1.4.15 The receiver subsystem shall operate over an ambient temperature range from +50 to +100 degrees Fahrenheit. The receiver subsystem shall be sufficiently thermally stabilized to reduce thermal sensitivity of measured RF signals to less than 0.001 dB/degree Fahrenheit over an ambient temperature range of 60 to 80 degrees Fahrenheit.

1.4.16 The receiver subsystem shall be compatible with the latest high speed digital interfaces.

1.4.17 The receiver subsystem shall have either a physical front panel control or system software supported virtual front panel that can be used to manually control and take reading from the receiver.

1.4.18 The receiver subsystem front panel control shall be menu-driven and have a clear high definition display for ease of use.

1.4.19 The receiver subsystem shall have an external reference input with TTL/CMOS level compatibility.

1.4.20 The receiver subsystem shall have a reference frequency output.

1.4.21 The receiver subsystem shall be delivered complete with all ancillary devices, including low-loss microwave cabling, mixers, switching units, standard gain horns, software/hardware gating/control, et al to accommodate the antenna testing as defined in this document as well as conventional antenna measurements in the X to Ku frequency bands. Except for internal to established COTS equipment, braided outer conductor semi-rigid RF cables shall not be used in the receiver subsystem.

1.5 Positioning System

1.5.1 The upgraded positioning system shall replace the SA-5751 Test Positioner Assembly, Feed Polarization Positioner Assembly, and positioning subsystem components of the SA-2041A—including but not limited to those listed in this document—with modern COTS equipment.

1.5.2 All existing cables for the positioning system shall be replaced. All RF cables in the ICARMS #4 that go across any ICARMS #4 positioner axis where that cable is subject to motion shall be replaced with a robust flex rated cable having electrical performance equal to or better than the original RF cable.

1.5.3 Braided outer conductor semi-rigid coaxial RF cables shall not be used on any part of the system.

1.5.4 All positioner axes shall be controllable by system computer and manual means. Each antenna positioner axis shall be independently controlled and operatable simultaneously with all other axes.

1.5.5 The feed polarization positioner shall be operatable both by manual and system computer control independent and simultaneously with all other positioner axes.

1.5.6 A mobile, cable-mounted local control unit shall be located in the chamber and shall control all positioner axes and all feed axes.

1.5.7 The local control unit shall contain a “live main” switch that will stop all motion once released. There shall also be a conveniently located emergency stop button in both the control room and the chamber.

1.5.8 The cable connecting the local control unit to the positioner controller shall be sufficient in length to reach all areas of the positioner and the user location for the boresight/range alignment kit at the rear of the chamber.

1.5.9 The ICARMS #4 shall contain a positioner display subsystem that shall display absolute and operator offset positions of all axes of the positioners, including the feed axis(s).

1.5.10 The positioner display subsystem shall have the following features minimum:

· process all axes position data (both mixed synchro and encoder) simultaneously

· simultaneous display of all axes with no restrictions as to which axes are to be displayed

· display of all axes in chamber as well as in control room

· compensation for velocity related errors

· IEEE-488 or latest digital interface programmable

· programmable offset angle for each axis (to optionally display either absolute or offset)

· update rate shall be compatible with highest positioner speed, and shall not limit overall system ability to acquire and process data

· 0.0001 degrees display resolution

· 0.5 inch minimum display characters

· axis label for each axis

1.6 Test Positioner Assembly

1.6.1 The current SA-5751 Test Positioner Assembly shall be removed and replaced with a modern, COTS, roll-over-azimuth-over-elevation-over-slide positioner assembly. The new positioner assembly shall have—at minimum—the speed, torque, and range of motion specified in Table 1.

1.6.2 All axes shall have the required torque (withstand and delivered) per Table 1 at all angles and limits of the positioner. All the positioner’s axes, excluding slide axes, shall have 18-bit or better (19, 20-bit, etc.) encoders that will yield a positioning accuracy greater than +/-0.005 degrees, peak-to-peak, and a point-to-point repeatability to within 0.001 degrees. Mean Time Between Failure (MTBF) for the encoders shall be 100,000 hours minimum. For maintainability, the encoders and any associated components shall be designed and installed to allow convenient removal/replacement.

NOTE

"Delivered" torque is defined as the maximum torque delivered by the positioner motor against the unbalanced load movement, in order to effect positioner rotation about the selected axis. "Delivered" torque must be computed in order to select the appropriate motor size, i.e., horsepower at rated current.

"Withstand" torque is defined as the maximum externally-delivered torque about the axis of rotation that can be safely applied to the positioner. It is generally assumed (for purpose of positioner and gearbox design), that the units must withstand this torque intermittently and only for periods of short duration.

1.6.3 All orthogonal positioner axes shall be orthogonal to within +/- 0.05 degrees maximum under loaded conditions, with respect to each other. The orthogonality and intersection of all positioner axes shall be made such that the antenna tests defined in this document are accurately performed with optimum system efficiency.

1.6.4 The positioner as a minimum shall meet the requirements of Table 1. The positioner shall be mounted on a slide axis which shall transverse the length of the test zone. The azimuth axis and the elevation axis shall have high accuracy 18 bit or better (19, 20-bit, etc.) directly-coupled, absolute encoders installed to provide an absolute position accuracy greater than +/- 0.005 degrees, peak-to-peak, and point-to-point repeatability within 0.001 degrees.

1.6.5 The maximum speed (FAST-SPEED MODE) of the positioner axes shall meet the max speeds specified in Table 1.

1.6.6 The minimum speed (SLOW-SPEED MODE) of all axes shall be less than 0.02 degrees per second.

1.6.7 All positioner and feed axes shall be controllable by system computer and manual means. A mobile cable-mounted local control unit shall be located in the chamber to control all positioner axes and all feed axes. A panic stop button or switch shall be available on the local control unit. The cable connecting the local control unit to the positioner controller shall be sufficient in length to reach all areas of the positioner and the user location for the boresight/range alignment kit at the rear of the chamber.

1.6.8 All positioner axes shall have adjustable limit switches located at the specified angular limits of the positioner axes defined in Table 1. The limit switches shall be installed at the appropriate locations on all axes to prevent UUT, fixturing, antenna, and/or positioner damage.

1.6.9 All cables and control wires to or through the positioners shall have disconnect points at the base of the positioner.

1.6.10 The new positioner’s roll axis bolt-hole pattern shall be compatible with that of the current SA-5751 bolt-hole pattern.

1.6.11 Each positioner axis shall have a cable motion management system that ensures that each cable manufacturer’s recommended bending/flexing/twisting limits are not exceeded as the ICARMS #4 UUT positioner system is moved through its range of motion.

1.6.12 Cable motion management components used in the system shall be used in accordance with the respective manufacturer’s guidelines.

1.6.13 The cable management system for each axis shall protect each cable and prevent the snagging and entanglement with other components (equipment, hardware, cables, etc.).

1.6.14 The cable management system for each axis shall prevent twisting of any of the RF cables.

1.6.15 The cable management system shall not negatively impact the cables durability, the ICARMS #4’s RF measurement’s dynamic range, RF channel isolation, repeatability, or accuracy.

1.6.16 All cables (RF cables, control cables, motor cables, etc.) in the ICARMS #4 UUT system that are subject to motion and flexing shall be flex rated cables.

1.6.17 Braided outer conductor semi-rigid RF cables shall not be used.

Table 1: Positioner Motion Requirements Positioner Motion Minimum Requirements

(Delivered / Withstand)

0.001 inch resolution

1.7 Feed Polarization Positioner Assembly

1.7.1 The existing Scientific-Atlanta Feed Polarization Positioner Assembly shall be removed and replaced with a modern COTS range feed polarization positioner.

1.7.2 The range feed polarization positioner shall be installed in a position that optimizes the quiet zone performance of the range at all polarization angles.

1.7.3 The range feed polarization positioner shall allow for continuous rotational motion by way of rotary joint. The maximum speed of the range feed polarization position shall be greater than 3 rpm.

1.7.4 The range feed polarization positioner shall utilize a high-accuracy (18-bit minimum) absolute encoder as its position feedback device.

1.7.5 The range feed polarization positioner shall be furnished and installed with a removable, linear polarized waveguide X-Band range feed for operation between 8 GHz and 12.4 GHz and shall be furnished (but not installed) with a removable, linear polarized waveguide Ku-Band range feed for operation between 12.4 GHz and 18 GHz. Both furnished range feeds shall have cross-polarization discrimination greater than 35 dB.

1.8 Positioner Wavefront Alignment

1.8.1 The new test positioner assembly shall be equipped such that routine wavefront alignments may be performed to align the range’s optical/mechanical reference to the wavefront normal of the range’s electromagnetic axis.

1.8.2 The existing Nikon Model 6B Brightfield Auto-Collimator and mast assembly shall be used to perform wavefront alignment for the new test positioner assembly.

1.8.3 The new Roll positioner shall provide for adjustable a precision spindle mirror that is compatible with the current wavefront alignment setup.

1.8.4 A minimum of four each, 4-inch diameter, precision mirrors with magnetic feet shall also be supplied for optical boresight alignment.

1.8.5 An adjustable magnetic mirror mount shall be supplied and attached to the rear of the UUT positioner's Roll axis. The mirror mount shall have sufficient adjustment to allow the mirror to be adjusted so that there is no apparent wobble of the autocollimator’s line-of-sight when properly adjusted and sighted-in.

1.8.6 The contractor shall align the autocollimator/steel-flat plate assembly perpendicular to the compact range electrical wavefront using GFE antenna/fixture combination P/N X868020.

1.9 Positioner Platform

1.9.1 The new positioning system shall be equipped with a moveable platform that provides the technician safe and easy access to the polarization positioner to safely work on UUT’s while positioner is in the UUT test position.

1.9.2 The existing platform shall be removed from the chamber

1.9.3 The platform shall have staircase equipped with handrails.

1.9.4 The platform shall be moveable to minimize interference with testing.

1.9.5 The platform shall provide enough height for the technician to safely work on UUT’s mounted on the polarization positioner.

1.9.6 The platform shall comply with all Air Force and OSHA regulations.

1.9.7 The platform shall be constructed with non-conductive materials and shall not degrade the ICARMS #4 performance.

1.9.8 RF absorber shall be installed along the front face and edge of the platform to minimize RF reflections.

1.10 Standar Gain Horns

1.10.1 ICARMS #4 shall be furnished with one X-Band Standard Gain Horn and one Ku-Band Standard Gain Horn.

1.10.2 Each gain horn shall be calibrated for gain over frequency with calibration results included.

1.10.3 Each gain horn shall include a waveguide-to-coaxial adapter.

1.10.4 Each gain horn shall have nominal gain greater than 20 dBi.

1.11 RF Absorber

1.11.1 All existing RF absorber shall be removed, and all new RF Absorber shall be installed in the ICARMS #4 test chamber (the chamber dimensions are approximately 20 x 40 x 20 feet).

1.11.2 The anechoic chamber walls, floor, and ceiling shall be lined with microwave absorber material to reduce reflected signal levels to the degree required to meet the test zone performance criteria specified in this document. Damaged areas of chamber shielding shall be repaired using sheet metal and foil tape in manner consistent with best commercial practices.

1.11.3 The absorber shall be sized for optimal performance over the UHF to Ku band frequency range.

1.11.4 Absorber shall be applied to the positioner and front of moveable platform as required to meet the test zone performance criteria specified in this document.

1.11.5 The absorber material shall be treated to minimize fire hazard. The absorber shall comply with tests described in NRL Report 8093, tests 1, 2, and 3. During normal operation the absorber material shall not emit gas or vapors that are hazardous to personnel nor degrade the UUTs' mechanical/electrical integrity and performance.

1.11.6 A fungicide shall be incorporated into the absorber coating to inhibit mold and fungus growth. The fungicide shall not endanger personnel.

1.12 Test/Quiet Zone

1.12.1 The combination of the new positioner, as well as new absorber requires the test zone of the range to be considered.

1.12.2 The upgraded ICARMS #4 shall meet the test zone performance criteria specified in Table 2.

1.12.3 Field probing data shall be provided to ensure performance characteristics of the ICARMS #4 range test zone are met; this data shall be provided in the contractor’s format and included in the Test/Inspection Report.

Table 2: X through Ku Band Test Zone Performance

1.13 Instrument Controller

1.13.1 The ICARMS #4 shall utilize modern COTS computer, operating system, and software to control all critical ICARMS #4 instrumentation and positioning equipment via appropriate interface buss(es) for testing and analyzing the antenna measurements referred to in this document.

1.13.2 Computer, operating system, and software shall provide broad compatibility with standard COTS peripherals and software.

1.13.3 Computer, operating system, and all software shall meet all applicable security requirements.

1.13.4 The instrument controller shall be delivered complete with all ancillary cables, hardware, and software necessary to fulfill ICARMS #4 requirements.

1.13.5 The ICARMS #4 shall be equipped with the following computer hardware and software minimum:

NOTE

Hardware and Software that provides upgraded and improved performance while still maintaining Personal Computer (PC) compatibility may be substituted in place of the list below (Latest releases of the software specified shall be supplied):

· Two PC’s:

· 3 GHz or faster Intel 64-bit CPU

· 32 Gigabytes Random Access Memory (RAM)

· 2 Terabyte or greater removable hard drive (conveniently removable to allow overnight storage in safe)

· High Speed video/graphics capability

· Ergonomic keyboard

· Mouse

· USB Ports (number of ports dependent on system design), USB port blockers with keys for unused USB ports and USB peripheral locks with keys for used ones

· Fast Ethernet ports (number of ports dependent on system design)

· GPIB interface (number of ports dependent on system design)

· Removable CD/DVD Read/Write drive with 100 blank discs

· Heavy Duty Power Supply

· Power Line Surge Suppressor

· Uninterruptable Power Supply (Battery Back-up) with system notification and soft shutdown implemented

· All ancillary peripherals, bus/interface cards, etc. needed to operate and use the system

· Four additional removable hard drives identical to the ones in the delivered PC’s

· Three external DVD-ROM/CD-ROM drives (read only devices, cannot have write capability) compatible with delivered PC’s

· Six 32 inch or greater high-resolution color flat screen monitors (two for the primary controller, two for the secondary controller, and two for monitoring inside the chamber positioner.

· Two modern computer workstations (desks, tables, chairs, etc.)

· Two High-Speed Color Laser Printers (HP Laserjet PRO MFP M277dw or equivalent) with extra set of toner cartridges for each

· All cables, hardware, and software to connect both PCs to peripherals and equipment and to network the controllers together

· All cables, hardware, and software to provide for viewing and controlling the system controller computer from the control room and the chamber

· All cables, hardware, and software to project the system controller computer’s display screen onto the range reflector from inside the chamber

· Two copies (one for each computer) of Microsoft Windows 11 Professional 64-bit or later software

· Two copies (one for each computer) of Microsoft Office Professional (Latest Version) software

· Two copies (one for each computer) of MATLAB (Latest Version) Software

· Two copies (one for each computer) of the Phased Array System Toolbox (Latest Version) for MATLAB

· Two copies (one for each computer) of Microsoft Visual Basic Professional

· Two copies (one for each computer) of development environment used to develop System software

· Two copies (one for each computer) of all software needed to operate and use the system to test the APN-241 antenna.

· Two Site licenses with perpetual rights for all supplied software

· Three copies of all software disks. Operating system and all software necessary to build system to point where external DVD-ROM/CD-ROM drive can be used to install remaining software shall be delivered on DVD-ROM/CD-ROM read only media.

Both computer systems shall be identical and capable of controlling the test process. The ancillary computer shall serve as a backup to the primary computer. Having both computers networked shall allow test operators to archive and further analyze measurement results.

1.14 Measurements

1.14.1 The following antenna measurement capabilities shall be provided at minimum:

- Gain

- Beamwidth

- Side-lobe Levels

- Radiation Pattern

- Boresight

- Axial Ratio

1.14.2 Accuracies of the above parameters should reflect the accuracies and capabilities of the Compact Range, Positioner, Receiver Subsystem, Signal Source Subsystem, etc.

1.15 Data Acquisition and Analysis

1.15.1 Data processing and output modes for the measurement system shall include as a minimum:

- Gain

- Beamwidth (AZ, EL)

- First Side-lobe level (AZ, EL)

- Difference port null depth (AZ, EL)

- Difference port null location (AZ, EL)

- Axial ratio versus aspect

- Plots of patterns versus aspect

- Boresight Error (Mechanical to Electrical)

1.15.2 A test result summary shall be provided as an electronic document and via a printer. Multi-color hard copy plots shall be provided upon operator request.

1.15.3 Data shall be stored on a disc or other removable media, and shall be annotated with the UUT type, serial number, operator, time, and date.

1.15.4 Data and test result summaries shall be organized in a consistent, organized, and sortable folder structure.

1.15.5 The result summary shall include a complete pass/fail result of acquired data as it pertains to the UUTs.

1.15.6 A UUT specific test file shall be generated to acquire, analyze (PASS/FAIL-GO/NO-GO), and report output.

1.15.7 All measurements and calculations shall be accomplished in accordance with the antenna testing defined this document.

1.15.8 Provisions shall be made in the UUT test file or ICARMS #4 main program to allow convenient change of test parameters to accommodate revisions to the UUT specifications. These provisions shall also allow a convenient method of selecting and deselecting individual tests and frequencies which would allow a programmer to lock test parameters.

1.16 Reliability

1.16.1 The ICARMS #4 shall have a Mean-Time-Between-Failure (MTBF), excluding GFE, of 2000 hours minimum. The MTBF shall include all contractor supplied components, parts, equipment, et al. A failure is defined as the degradation of any system function below established levels of acceptable operation.

1.17 Maintainability

1.17.1 System repair is assumed to consist of, primarily, removing and replacing the faulty system TRUs.

1.18 Software The Contractor shall provide COTS software allowing the capability for the Government to create its own integrated programs, scripts, sequencing, and diagnostics modules in the future. The Contractor shall also provide procedures on how to build/maintain software and update parameters. The software shall not require fees other than a one-time fee. The software shall be configured in a way that allows for easy future updates and patches. The Contractor shall provide the Government software license granting full rights to use, modify, reproduce, release, perform, display, or disclose computer software and documentation. CPIN data shall be delivered on electronic media format CD/DVD ROM. For the newly identified Computer Program Configuration Items (CPCIs), the request for CPIN shall be initiated and submitted at least 30 days prior to PDR. Final approval of the CPIN shall be assigned 120 days prior to delivery of CPCI. (CDRL A001, DI-MISC-81454C, ACPIN Data and Control Record)

1.19 ICARMS #4 Operating/Test Software

1.19.1 The ICARMS #4 computer systems shall be equipped with an x86-64 PC compatible computer running the latest Microsoft Windows 11 Professional 64-bit operating system release. The PC shall be all inclusive. The selected operating system shall provide for complete control and analysis capabilities. In addition to providing a user friendly, menu driven environment for developing and executing production test software, the system shall control data acquisition, real-time processing, data storage, graphics processing, self-calibration, and UUT Pass/Fail diagnostic evaluation. All Source Code, Object Code, and Firmware generated by the contractor and/or subcontractors and used to perform the antenna measurements specified herein shall be delivered. Source code for third party utility software packages does not have to be delivered. The ICARMS #4 contractor shall make available to the government any source code updates and/or revisions.

1.19.2 In addition to the GO/NO-GO testing of the APN-241, the software shall provide GO/NO-GO (PASS/FAIL testing) of the antenna measurement parameters specified in this section. System software shall make maximum use of the equipment resolutions, speed, and accuracies, and shall not be the limiting factor in determining overall system accuracy and resolutions. The system software shall be developed to allow the user to display recorded results and shall allow the user to optionally select and execute any portion of the ICARMS #4 Test parameters.

1.19.3 The ICARMS #4 operating/test software shall be window based, mouse driven, and shall make maximum use of icons and pull-down windows. The program shall power down safely in the event of a system power failure to prevent loss of data. The program shall have the following six major elements or equivalent minimum:

· System monitor

· Sequence linker

· Data acquisition

· Data analysis

· Data output

· Manual mode

1.19.4 Each of the above elements shall provide "online context sensitive help" information describing its functions upon request by the ICARMS #4 operator.

1.19.5 The software shall allow the operator to “stop” and “resume” automatic testing at the end of a scan without data loss. The software shall allow the operator to power down, without data loss, at intervals not to exceed 20 minutes.

1.19.6 The ICARMS #4 software shall provide for identification according to the security rating of the contents of all files created and/or managed by the system. The ICARMS #4 software shall prevent creation and/or storage to nonvolatile, non-removable system storage (i.e. hard drive) any file (control, test data, data evaluation, temporary, final, etc.) which contents have been identified with a security rating other than “None or Unclassified”.

1.19.7 The ICARMS #4 software shall be user configurable so as to prompt the operator for test frequency information at the beginning of test selection and execution. Frequency information supplied in this manner to the ICARMS #4 software shall not be stored on any nonvolatile, non-removable system storage device. The ICARMS #4 software shall maintain this frequency information until power down or system reset and shall provide the information to the appropriate elements as necessary.

1.19.8 The system monitor shall provide all functions for directory and file maintenance, equipment configuration and installation, system backup, power-up and power-down, and any other essential administrative tasks. File maintenance shall include but not be limited to producing ASCII text files that contain the analysis and pass/fail information about a particular data file.

1.19.9 Each of the other five major elements shall provide all functions to create, edit, and maintain its particular control file. Each control file shall direct its specific element as to the task that is to be performed. Each control file shall run either separately or through the sequence linker. The sequence linker shall provide for automatic execution of the data acquisition, data analysis, and data output files that comprise a test. Multiple test definitions shall be able to be combined together to form a complete testing package including GO/NO-GO (PASS/FAIL) testing. It shall also allow for prompts to the operator, operator intervention to stop testing at the end of a major element task and allow testing to resume later from the same point without data loss.

1.19.10 The data acquisition element shall setup and control all of the equipment and activities to obtain the data for one test. The equipment setup and data scan parameters shall be stored in a data acquisition definition file. This element shall be able to control all programmable functions of the ICARMS #4 and store this control feature as part of the data acquisition definition file. This element shall also provide control for the following, but not limited to, scan related items:

· Testing from 1 to 1000 (minimum) different frequencies with arbitrary spacing.

· Selection of source of frequency information (supplied by operator at beginning of ICARMS #4 system execution or defined in data acquisition definition file). For operator run-time supplied frequency information the element shall provide for defining how much of the supplied information to use (i.e. which frequencies to use).

· Blanking of frequency display on all equipment when desired.

· Retrace and bi-directional scanning.

· Setting axis for continuous rotation.

· Forward or reverse scanning.

· Setup of a step axis.

· Selection of active axes.

· Pre-scan positioning of the active axes.

· Control of scan speed.

· Minimum five axes position data to be recorded with receiver data at each scan increment.

· Defining, configuring, and utilizing virtual positioner axes as scan and step axis same as physical positioner axes

· Defining, configuring, and utilizing time as scan axis

· Defining, configuring, and utilizing frequency as scan axis

· Internal calibration and optional "no calibration" of the receiver at the beginning of the scan and/or on every scan.

· Real-time confirmation plot on the monitors during and after the data acquisition.

· Handling overspeed (data vs. position assignment over-run) condition.

· Entering comments to be stored in the data acquisition control file.

· Printing the setup defined in the data acquisition control file.

· Selection of destination (storage device/directory/subdirectories/filename), both temporary and final, of acquired data.

· Independent identification of data acquisition definition and resulting test data files according to contents’ security rating including but not limited to: None, Unclassified, Proprietary, Confidential, and Secret.

1.19.11 The data analysis element shall provide all functions to perform the following antenna measurements:

· Gain

· Beamwidth and power points midpoint location (@ operator specified power point level)

· Sidelobe power and location (@ operator specified power change required for sidelobe)

· Null locations and associated power level

· Null width and null lobe imbalance

· Sum and difference cross-over location and power level

· Boresight

· Axial ratio

1.19.12 The data analysis element shall evaluate the scan data with user-specified requirements including GO/NO-GO status. These requirements shall be in the form of: user generated conformance curves; arithmetic operations such as Root-Mean-Square (RMS); mean; standard deviation (multiple sigma); peak; collected data with offset conformance curves; plot overlays, and user specified values for measured parameters. Pass/fail results and information shall be stored along with processed data. The data analysis element shall allow for selection of source (storage device/directory/subdirectories/filename) for conformance data and selection of destination (storage device /directory /subdirectories /filename) in which to store pass/fail results and processed data. The data analysis element shall provide for identification of destination file according to destination file’s content’s security rating. This security rating shall be independent of all other files (i.e. the source file may have one rating and the destination file another).

1.19.13 The data output element shall provide all the functions to output any previously stored data, both raw and processed from any source (storage device /directory /subdirectories /filename), to the CRT, color plotter, and printer. This element shall provide for the following:

· Automatic and manual scaling of data, grids and axes

· User defined labels for all the axes

· Annotation of UUT specific information, test time, date, and operator

· User selected security label including but not limited to: None, Proprietary, Confidential, and Secret

· Output of the data in any of the forms (LOG, Linear) regardless of recorded form

· Annotation of all pass/fail results stored with processed data on output

· User selectable grid types including but not limited to: invisible, solid, dot, and dash

· User selectable line types including but not limited to invisible, solid, dot, and dash

· Sixteen (minimum) user definable colors to be used to distinguish different traces

· Basic information about the data (number of scan positions, step positions, and frequencies)

· Plot formats including but not limited to rectangular, polar, contour, isometric, and colorfill

· Allow 1 to four (minimum) plots to be plotted on the plot output

1.19.14 The manual mode element shall provide all the functions to allow the operator to manually control the positioner and all other ICARMS #4 measurement equipment. This element shall provide the operator with real time digital chart recorder capability. This element shall allow the operator to manually control the positioner while continuously recording and graphing data as defined by the operator’s selected data acquisition element’s control file. Additionally the manual mode element shall provide for the real time recording and graphing of the velocity and acceleration of each positioner axis as well as synchronized recording of operator selectable position, velocity, and acceleration of virtual and constituent axes moving in simultaneous and coordinated motion. The manual mode element shall provide controls for operator manipulation of the digital graph (selection of what data to plot, adjustable scales, colors, plot types, annotations, etc.) as well as saving and printing the graph. In order to expedite and maximize test efficiency, all previously recorded data shall be acquirable manually to allow the operator to manually inspect/compare test data in real-time.

1.19.15 The ICARMS #4 software shall perform convenient "user-friendly" GO/NO-GO (PASS-FAIL) testing of the APN-241 per requirements defined in this document.

1.19.16 The software shall conveniently allow the test engineer to string together a group of test files and have them automatically and sequentially execute in order of importance to the UUT. This set of test files shall be storable as a UUT test file such as "APN-241 Electrical Test Program" so that the ICARMS #4 production operator can easily perform the routine measurements on an as needed basis. Testing criteria (conformance parameters) for PASS-FAIL analysis shall be easily changeable to allow for changes to the Test Requirement Documents such as those in the APN-241 antenna tests defined in this document.

1.19.17 The software shall also provide a means for locking out unauthorized changes so that the integrity of the testing cannot be threatened by accidental or intentional changing of test parameters by operators or unauthorized personnel.

1.19.18 The measurement system shall be programmable, allowing the entry of a complete sequence of operations, which include data acquisition, processing, evaluation, report making, and final data disposition. Full flexibility with respect to data acquisition shall be required, enabling the programming of any sequence of operations. The same shall be true of the processing stages.

1.19.19 An example of sequence operation could consist of performing antenna gain, beamwidth, and side-lobe measurements versus azimuth, elevation, roll position etc. This would be performed at several selected frequencies within the data range. Then, finally, automatic PASS/FAIL OR GO NO GO evaluation would be performed, and the test result summary printed.

1.19.20 The system operating parameters and measurement sequences shall be stored on the system storage media thus allowing any number of measurements utilizing the same sequence to be performed under identical operating conditions. Provisions shall be made so that Sequence files may be altered, deleted, copied, or viewed by system operators but the system shall allow a means for locking-out these features to prevent accidental alteration of performance parameters. Provisions shall be made so that Data files can be copied or viewed by operators.

1.19.21 There shall be no site license fees, user fees, maintenance fees, and/or operating fees, et al. (other than a one-time initial charge) required to operate any of the ICARMS #4 software. The one-time initial charge, if any, shall be included as part of the cost of the ICARMS #4 system.

1.20 Self-Test and Status Monitoring

1.20.1 The ICARMS #4 shall provide a self-test capability to verify the functional integrity of the primary system hardware (Receiver Subsystem, Signal Source Subsystem, UUT Positioner, Positioner Display Subsystem, etc.).

1.20.2 The self-test shall perform pattern and boresight analysis on each reference data set to verify that the reference data is within defined limits and that the mechanical alignments are correct.

1.20.3 The self-test shall perform analysis on reference data and UUT data to monitor the health of the RF cables and RF rotary joints in the system.

1.20.4 The self-test shall ensure the primary Test & Measurement Equipment is on-line prior to initiation of testing.

1.20.5 The self-test shall report the status of the analyses as well as capturing and reporting error flags/conditions reported by the primary system hardware.

1.20.6 Test failures/Error conditions shall be identifiable to the faulty TRU.

1.21 Commercial Software

1.21.1 The Contractor shall make maximum use of commercial off-the-shelf software and provide to the Government as a part of this contract one active, perpetual license per supplied workstation for any commercial software products. These shall include any commercial software required for the operation of the upgraded ICARMS #4.

1.22 Software Source Code

1.22.1 The Contractor shall deliver three copies (on CDROM media) of both source code and executable code for any software and drivers in support of or implemented as part of this upgrade. Software source code and executables shall be delivered at least 30 days prior to Acceptance Testing. Source code for third-party software is not required. (CDRL A002, DI-IPSC-81488/T, Computer Software Product)

1.23 APN-241 System Test and Evaluation

1.23.1 The contractor shall design and implement the ICARMS #4 in accordance with the associated specifications and acceptance test procedures (ATPs) in order to deliver a fully functional APN-241 antenna test capability.

1.23.2 ICARMS #4 shall be designed and instrumented to minimize test time in order to perform all electrical test requirements.

1.23.3 The ICARMS #4 shall be capable of performing a complete Go-No-Go, Pass/Fail analysis of the APN-241 antenna.

1.23.4 Maximum total test time shall not exceed the current maximum test time on Range 2.

1.23.5 Total test time shall include the time required for mounting and dismounting antenna; time used for acquiring all antenna data and computation data; and time for processing and displaying results.

1.23.6 Maximum production test time shall not exceed the current maximum production test time on Range 2. Production test time shall include all requirements for total test time.

1.23.7 The existing APN-241 mounting fixture and waveguide assembly shall be used in the final test procedure.

1.24 System Verification and Validation/Acceptance Test

1.24.1 The Contractor shall develop and submit an Acceptance Test Procedure (ATP) to the Government for approval. The ATP shall be delivered on electronic media format PDF. An initial ATP draft shall be presented to the Government at least 30 days prior to Preliminary Design Review (PDR) and a final draft at least 30 days prior to Critical Design Review (CDR). The ATP shall be finalized 90 days before any Acceptance or Validation/Verification Test. (CDRL A003, DI-NDTI-80603A/T, Test Procedure) 1.24.2

1.24.3 The Contractor shall then follow approved ATP to prove system functionality, performance, and full compliance…