Company Capability

Zelinda provides a complete design and build capability for radio communication subsystems, both terrestrial and spaceborne.  This capability ranges from initial feasibility studies; simulation; design; prototype build and test through to subcontracted manufacture.   Zelinda specialises in developing novel design solutions using digital processing to improve reliability, reduce size and mass as well as eliminating the need for "tuning" of analogue and RF circuits.   These novel designs are often conceived during "paper" studies undertaken to review and extend the boundaries of currently accepted practice.

While the company expertise is concentrated in the design of digital demodulators by using a network of specialist subcontractors Zelinda is able to offer a service that encompasses RF design and build to ESA space-flight standards.

Background Experience

Zelinda has acquired a wealth of understanding of the needs of space based communications as well as the project management skills needed to deliver on time and within budget.   Our engineers have more than 25 years experience in the space industry covering a diverse range of design activities from orbit prediction software, ground station antenna steering software through more recently to TT&C transponder design.  Our expertise in transponder and ground modem design has been gained through a variety of projects, many of which originate with the European Space Agency (ESA).   These projects include:

  • design and build of a DRS (Data Relay Satellite) ground modem capable of acquiring spread spectrum signals down to C/No of 33 dBHz;
  • design of a Small User Transponder digital demodulator capable of operating either via a relay satellite or in a direct to ground mode.  This used 70 MHz IF sampling together with a demodulator ASIC (Application Specific Integrated Circuit) which was designed using the Hardware Description Language, VHDL;
  • design and build of a direct sampling S-Band transponder which used entirely digital downconversion;
  • design and build of a Digital Processing unit for a Deep Space Transponder  (DST) capable of acquiring signals down to -154 dBm.