Software demodulation allows multi-standard terminals to cover sat-comms data, GPS and cellular without duplication
Software demodulation allows multi-standard terminals to cover sat-comms data, GPS and cellular without duplication
- Author(s): P.G. Mattos
- DOI: 10.1049/ic:19950229
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- Author(s): P.G. Mattos Source: IEE Colloquium on Evolving Technologies for Small Earth Station Hardware, 1995 page ()
- Conference: IEE Colloquium on Evolving Technologies for Small Earth Station Hardware
In 1989 SGS-Thomson and University of Bristol developed a combined GPS/INMARSAT-C terminal, under contract to INMARSAT, who wished to demonstrate the feasibility for the then imminent GMDSS and for fleet-control purposes for trucks. The work was an extension of a fully software GPS receiver design. Moving all the spread-spectrum processing and demodulation into software saved complex hardware, and led to flexibility, both in specification and in the use of the processor. The features of the processor that permitted this flexible use were high speed and high I/O bandwidth. The author discusses the use of this software modulation technique in the GPS, a GSM telephone system, and a generic radio receiver. (5 pages)
Inspec keywords: radio receivers; telecommunication computing; Global Positioning System; satellite ground stations; demodulation; cellular radio
Subjects: Radionavigation and direction finding; Modulation and coding methods; Satellite communication systems; Communications computing; Mobile radio systems
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