• CARRIER-DETECTOR EXTENDS ACQUISITION RANGE OF BPSK

      Chu, Peter; DECOM SYSTEMS, INC. (International Foundation for Telemetering, 1982-09)
      The capture and tracking range of a Costas type BPSK (QPSK) demodulator is limited by its loop bandwidth, which is determined by the synchronization threshold at different Signal-to-Noise Ratio. A frequency locked scheme, which consists of a carrier detector and digital control network, has been developed to work in parallel with the Costas loop, so the BPSK (QPSK) demodulator would be automatically led to its pull-in range at low Signal-to-Noise Ratio. The probabilities of false dismissal for signal and false alarm signal absent are analyzed.