1. A receiver for use in a PSK signal translation system comprising a voltage tunable local oscillator for continuously generating a reference frequency signal from which the suppressed carrier can be reconstructed, input signal means for an incoming PSK signal, means for adding said reference frequency signal to produce a synthesized carrier which is amplitude modulated by said incoming PSK signal, diode switch means for demodulating synthesized PSK amplitude modulated carrier for causing synchronous phase shifts of the PSK signal components of modulated synthetic carrier in response to the demodulated signals, to thereby provide a continuous unmodulated signal synthesizing the suppressed carrier of the incoming PSK signals; a servo loop, including said oscillator, said signal adding means and said phase shifting means, for locking said oscillator onto said synthesized carrier.
A signal detection device for a Doppler radar system comprising a circulator having an input, an antenna and a detector port. The signal at the detector port comprises the echo signal received at the antenna port and a small portion of the signal to be transmitted applied at the input port, the latter having a phase which varies transversely across the detector port. The detection device further includes a pair of detectors each connected to one of two points transversely spaced across the detector port for producing output signal of a frequency corresponding to the Doppler frequency and different phase. The phase difference between the two output signals is indicative of the approach or recession of a target with respect to the radar system.
