PAGE CONTENTS
Objectives
The project was developing an X-band transmitter (8.025GHz to 8.4GHz) using a high-speed baseband processor, coded and modulated to the latest CCSDS standards, in a compact highly integrated and power efficient design. The modulation drives a nonlinear SSPA followed by an integrated post-amplification RF shaping filter (as specified by ECSS-50-05C). Such an approach offers high efficiency at high data rates with low risk. In addition to this mode of operation, the system architecture readily supports linear modulation scheme such as QPSK.
To meet parallel to serial data stream processing as well as baseband processing the intention is to leverage the latest commercial FPGA technology, including commercial IP cores where needed.
The project took an evolutive approach that allowed a stepped development to more advanced coding and modulation techniques.
The result was a more flexible, software configurable product designed to give mission assurance with optimised cost of ownership for the evolving small sat world.
Picture credit: COM DEV Europe Ltd, Heritage C-band product
Challenges
The key challenges were in appropriate component selection for the given design philosophy and the system architecture choices to meet the exacting radiation, thermal, mechanical and electrical environmental factors, while maximising product functionality and configurability. Key experiences in flexible TT&C and heritage flight datalink products, where pragmatic qualification approaches were validated were essential to development success. Our development also required inputs from as many potential users as possible to ensure that its capabilities meet customer needs.
System Architecture
Plan
- MS1 PDR: Architecture development, Concept development & breadboard design
- MS2 CDR: detailed design and MAIT of EM unit
- MS3 TRR: EQM MAIT, test system development and release
- MS4 FR: Qualification of EQM and development.
Current Status
This activity is now completed.
