S-Band Communications System requirements.pdf

S-BAND COMMUNICATIONS SYSTEM

The Cognitive Communications project requires engineering and flight models of an S-band Communications System designed for cubesat operations. The system shall include a software-defined radio and a single-board computer. The system and its components shall meet or exceed the following Minimum Technical Requirements:

1 MINIMUM TECHNICAL REQUIREMENTS – SOFTWARE DEFINED RADIO (SDR)

• Transmit Frequency Range: 2000 MHz to 2500 MHz

• Transmit Bandwidth: 10 MHz

• Transmit Channels (simultaneous): 4

• Receive Frequency Range: 2000 MHz to 2500 MHz

• Receive Bandwidth: 10 MHz

• Receive Channels (simultaneous): 4

• Default Tx Waveform: BPSK/QPSK, >1 Msym/sec, Rate-1/2 Convolutional Code

• Default Rx Waveform: BPSK/QPSK, >1 Msym/sec, Rate-1/2 Viterbi Decoder

• Processing Capability: Field-Programmable Gate Array (FPGA)

• FPGA Family: Xilinx Kintex UltraScale – Industrial Grade, or equivalent capability

• Reconfiguration o Shall provide open access to software/firmware on processor/FPGA, allowing custom 3rd party development of software/firmware by government after delivery o Shall provide a radio Board Support Package enabling access to all radio hardware functionality for use by 3rd party developers o Shall provide storage for at least 3 user waveform images on-board the SDR o Shall store a fallback/failsafe waveform image for safe recovery o Shall support on-orbit waveform reprogramming

• Data Interface to Spacecraft Bus: SpaceWire

• Data Interface to Single Board Computer: Any compatible interface, 100 Mbps or greater

• Input Voltage (Typical): 12 Volts

• At least 8 general purpose input/output (GPIO) pins externally accessible through a connector and able to be controlled by user logic in the FPGA.

• RF Connectors: Coaxial

• Maximum Size: 10 cm x 10 cm x 2.5 cm

• All power and interface cables for the SDR shall be provided

2 MINIMUM TECHNICAL REQUIREMENTS – SINGLE BOARD COMPUTER (SBC)

• Processor: 64-bit ARM quad-core, > 1.5 GHz

• Memory: At least 1 GB DDR4 SDRAM with ECC

• Non-Volatile Storage: At least 4 GB solid-state storage

• Data Interface to Spacecraft Bus: 100BASE-T Ethernet or greater

• Data Interface to Software Defined Radio: Any compatible interface, 100 Mbps or greater

• Reconfiguration o Must provide open access to software and operating system on processor, allowing custom 3rd party development of software by government after delivery o Shall provide a SBC development environment that enables access to all SBC hardware functionality for use by 3rd party developers o Shall store a fallback/failsafe boot image for safe recovery

• Input Voltage (Typical): 12 Volts

• Maximum Size: 10 cm x 10 cm x 2.5 cm

• All power and interface cables for the SBC shall be provided

3 SYSTEM MINIMUM TECHNICAL REQUIREMENTS

• The SDR and SBC shall provide a data interface to each other at a minimum of 100 Mbps.

• The SBC shall provide a programming interface for uploading new waveforms to the SDR without physical access to the hardware (e.g. on-orbit waveform reprogramming).

• The SBC shall provide a command and telemetry interface to control the SDR and receive operational telemetry from the SDR.

• All interface cables between the SDR and SBC shall be provided

4 ENGINEERING MODEL AND FLIGHT MODEL MINIMUM TECHNICAL REQUIREMENTS

• Flight Model System Requirements for SDR and SBC o Pressure Range (Operating): 2.7 * 10^-10 Torr (minimum) to 709 Torr o Radiation Tolerance (Survival): >= 20 krad Total Ionizing Dose o Vibration (Survival): 2 g (Sine, 0-100 Hz) o Vibration (Survival): 0.1 g^2/Hz (Random, 50-800Hz) o Shock (Survival): 100 g (1kHz – 10MHz) o Temperature (Operating): -20 to +40 degC o Temperature (Survival): -40 to +85 degC o Materials: The use of metals subject to whisker formation shall be prohibited

• Engineering Model System Requirements for SDR and SBC o The engineering model shall be form, fit, and function equivalent to the flight model.

Environmental testing and/or analysis is not required for an engineering model.

5 QUANTITY

• The vendor shall deliver:

o Quantity 3 - SDR Engineering Models o Quantity 3 - SBC Engineering Models o Quantity 3 - SDR Flight Models o Quantity 3 - SBC Flight Models

• The vendor shall deliver all associated cables as required above for all SDRs and SBCs

• The vendor shall deliver all software and documentation necessary for third-party software and/or firmware development on the SDR and SBC, providing the ability to exercise all hardware capability.