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Paul Maguire


Zelinda develops cutting-edge Digital Signal Processing (DSP) systems for satellite communications and ranging. This includes system and feasibility studies, mathematical modelling, and simulation, and VHDL and HLS development for both ground and space-based equipment typically using state-of-the art FPGAs.

Our expertise

Zelinda offers a complete service from initial studies through to prototype manufacture and qualification while working closely with customers. This includes DSP designs in both hardware and software for Ground station modems and ranging units, Satellite TTC transponders, and Digital Modulators for Satellite transmitters. 


We have developed considerable expertise in Direct Sequence Spread Spectrum (DSSS), having developed both space-borne and ground-based DSSS systems. We offer flexible and autonomous radio expertise having developed a transponder prototype with autonomous detection of modulation scheme, symbol rate and code rate. 


Finally, our expertise extends to the development of high-speed high precision LDPC codecs and frame synchroniser for CCSDS standards. 

Service domain

  • Ground Segment Systems 

  • Satellite Technology 

Technology domain

  • Ground Station Systems & Networks 

  • On Board Data Systems 

  • RF Payload and Systems 

Products, services and projects

We, jointly with Honeywell UK, developed a low-cost S-band transponder that has sold more than 30 units worldwide for use on a variety of missions including several from ESA. 

Zelinda developed all the DSP for a dual standard transponder which was manufactured by Tesat and is now deployed on the Full Orbit Constellation (FOC) of the Galileo navigation system. 


We can analyse and model complicated communications challenges with high Doppler dynamics (such as Mars Entry Descent and landing) and devise suitable modulation schemes to meet exacting situations. 

Zelinda has developed a high-speed (up to 1.2 Gbps) high-performance ground demodulator for EDRS (European Data Relay System), as well as high speed LDPC decoders for ESOC’s state-of-the-art Tracking, Telemetry and command processor (TTCP). 

More generally we offer a design and development service for exacting communications situations from initial analysis through to prototype. 

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