ICD

Introduction

The purpose of this document is to define the external interfaces for the satellite communication subsystem. This includes mechanical, electrical, and data interfaces necessary for integration, operation, and testing.

Certain proprietary details governed under a Non-Disclosure Agreement (NDA) between the University of Manitoba STARLab and relevant parties are not included in this document. Access to these details is restricted to authorized personnel as outlined by the NDA.

Overview

The communication subsystem comprises the following components:

• Transceiver: S-band transceiver for telemetry and telecommand (TMTC).

• Antenna Assembly: Two wideband S-band antennas for uplink (Rx) and downlink (Tx) communication.

• Coupler : For combining Tx/Rx signals to be sent from transceiver to wideband antennas.

Electrical Interface

• Input supply voltage: 8V to 18V DC (via H2 stack connector)

• Typical power consumption: 1.66W (in receive mode)

• Overvoltage, overcurrent, and brown-out protection on transceiver

Data Interface

• Primary data bus: RS-485 via H2 stack connector

• Configuration and testing interface: USB-C on the transceiver module

• Supported protocols: ESPS I (proprietary satellite protocol), transparent UART mode for diagnostics

• Data bitrate: 0.1-125 kbps configurable

• Encryption: AES256

• Framing format:

  • CRC32

  • G3RUH scrambling

  • Forward error correction

RF Interface

• Uplink (Rx): 2025-2110 MHz

• Downlink (Tx): 2200-2290 MHz

• Transceiver output power: 26-33 dBm (1 dBm intervals)

• Modulation Schemes: FSK, 4FSK, MSK, PSK, configurable Gaussian filter (0.5, 0.3, and OFF)

• Transceiver to Coupler Connectors: MMCX connectors for Tx and Rx

• Coupler to Antenna Connectors: SMP connectors

• Antenna polarization: Right hand circular polarized (RHCP)

• Antenna Gain: > 5 dBi

• Antenna Half Power Beam Width (HPBW): 70 degrees

Mechanical Interface

Transceiver

• Operational temperature: -40 to 75 Celsius

• Mass: 190.85 g

• Volume: 89.2 mm x 93.7 mm x 18.5 mm

• Mounting : Four attachment bolts - ISO 7380-1 TX M3 A2

• Tightening torque: 1.00 Nm with threadlocker (e.g. Loctite 242)

• Quality testing: ESA standard ECSS-E-ST-10-03C and GEVS standard GSFC-STD-7000A compliant

Antenna (x2)

• Operational temperature: -40 to 125 Celsius

• Mass: 2 x (112.90 +- 2.00) g

• Volume: 96.5 x 69.7 x 4.8 mm

• Quality testing: ESA standard ECSS-E-ST-10-03C and GEVS standard GSFC-STD-7000A compliant

For more information on the mechanical interfaces please refer to the following links:

• S-Band Antennas: Link (LISSA Assembly ICD)

• Hybrid Coupler: Link (POW-COM Module ICD)

Reference Documents

• EnduroSat S-band Transceiver I Datasheet

• EnduroSat Wideband S-Band Antenna Datasheet

• ECSS-E-ST-10-03C Standard

• GSFC-STD-7000A Standard