ATTACHMENT_ A_ 80MSFC24Q0001_SOW_LunaNet_11302023.pdf

Solicitation 80MSFC24Q0001

ATTACHMENT A

STATEMENT OF WORK

1. Objective/Requirements To support ground testing of future surface navigation networks, NASA requires a pair of navigation sensors that are compatible with LunaNet Augmented Forward Signal (AFS) definition of a radio frequency-based navigation reference signal. Unit 1 transmits the navigation signal as specified below in Section 2.2.1 and 2.2.3. Unit 2 will receive this signal and produce a one-way range measurement per Section

2.2.4. These units will be used to assess and demonstrate this type of navigation approach for future surface navigation networks, as a complement to other signals and sensors.

2. Characteristics, Scope, and Specs

The contractor shall provide the following:

2.1. Provide two hardware elements that can be used for testing of transmission and reception of implemented navigation signal

2.1.1. Vendor can propose two identical units (that can each transmit and receive) or individual dedicated transmission and receiver units.

2.1.2. Note: These will be used in lab and limited outdoor testing with one unit acting as transmitter and one acting as a receiver. Initial testing will be conducted via direct hardware connection. Limited outdoor testing may be conducted, in which case external power amplification and antennas will be added.

2.1.3. Units shall support Radio Frequency (RF) output/reception using SMA.

2.1.4. Note: As intended, ground development hardware is acceptable, such as breadboard systems or engineering models.

2.1.5. Note: The units do not need to be flight quality or form-fit-function to potential flight platforms; it is acceptable for vendors to simply document how the implementation on proposed platform is applicable to a flight implementation.

2.1.6. Note: Environmental testing of the provided hardware is not required.

2.2. Implementation and utilization of a prototype LunaNet-compatible Augmented

Forward Signal as defined below:

2.2.1. Signal defined in LunaNet Interoperability Specification (version 5 is currently out for public comment, this SOW assumes the following implementation) :

2.2.1.1. Modulations adopted shall be in line with current GNSS signals, by utilizing Bi-Phase Shift Keying (BPSK) and/or Binary Offset Carrier (BOC) modulations. Two channels are foreseen, one in-phase (I) and one in quadrature phase (Q). The I-channel will facilitate acquisition, navigation capabilities, and serve as a data channel. The I- channel will consist of a BPSK (1) modulation, utilizing a spreading code at

1.023 Mcps.

2.2.1.2. Signal shall utilize Global Positioning System (GPS) L1 C/A Code as defined in GPS-ICD-200 Section 3.2.1.3; vendor shall define Psuedo-Random Noise (PRN) Code used; it is preferred to use unallocated PRN values.

2.2.1.3. Signal shall be capable of being transmitted at 2483.5-2500MHz per LunaNet Specification.

Solicitation 80MSFC24Q0001

2.2.2. Note: New signal standard in work providing additional content on AFS and LunaNet Navigation Messages. The work requested herein is to simply generate the raw navigation signal and the ability to measure a received phase (with relation to an onboard signal synchronized with its clock). Processing navigation messages or content is not a requirement.

2.2.3. Transmission Mode:

2.2.3.1. Unit shall sync the onboard code to be an input phase value to start transmission at start of a second rollover.

2.2.3.2. The signal shall then be modulated onto an S-Band signal as specified within the LunaNet Specification and in expected frequency ranges (2200-2290 and 2483.5-2500MHz) for transmission and consistent with LunaNet Specification.

2.2.4. Receiver Mode:

2.2.4.1. Unit shall be capable of receiving S-Band signals in the same band being transmitted (2200-2290, 2483.5-2500 MHz).

2.2.4.2. Unit shall compare the phase of an onboard generated code to that received from the transmitter to calculate a difference in phase, allowing for a representative one-way ranging measurement.

2.2.5. Note: It is expected that there will be a residual time offset due to the two clocks not being synchronized. This will be addressed by controlling ground time references

2.2.6. Units shall be capable of being disciplined by external timing reference signal of either 10MHz or 10.23 MHz or 1.023 MHz Reference (per AFS- Specification)

2.3. All units shall be controlled via RS-422 or similar interface with 12-28V power inputs where the unit utilizes onboard power regulation, input of regulated voltages such as 3.3V or 5V are accepted are also acceptable.

2.4. The Vendor shall coordinate with MSFC to schedule a product implementation and review meeting prior to shipment. After review, the hardware shall be delivered to MSFC. Delivery shall be via commercial freight or similar.

2.5. Vendor shall provide ICD and limited documentation verifying command sequence, spectrum of transmitted signals, and verification of capability to measure phase on receiver end.

2.5.1. Note: Ability to correlate to an actual measured range will be conducted by MSFC personnel, assessing stability with various time references, and time synchronization across each unit.

3. Delivery Date: No later than 1 year after order acceptance.