SPECTRAL EFFICIENT BIT RATE AGILE AND IF FREQUENCY SELECTABLE FQPSK COMMERCIAL AND GOVERNMENT PRODUCTS DEVELOPMENTS
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AbstractRF Networks developed one of the first flight tested practical modems to use the Feher-patented Quadrature Shift Keying (FQPSK)  modulation technique. The modem was developed, using as a base platform, a modem originally developed to transmit data over coaxial cable and microwave systems. Modifications were made to the modem to accommodate the patented modulation at baseband and to ruggedize the modem for prototype testing in flight telemetry applications. Pioneering efforts resulted in the first transmitter/receiver pair to be flight proven utilizing the FQPSK modulation technique. Results of these tests confirmed an acceptable alternative to PCM-FM that provides a significantly improved spectral utilization. Current development of data rate agile transmitters and receivers for aircraft and missile telemetry for the US Air Force will be discussed in general terms.
SponsorsInternational Foundation for Telemetering