Patent ID: 6313782
Filing Date: 2001-11-06
Classification: G01S,H04B

Abstract:
In combination, means for developing a continuous-wave alternating current output generator means for providing a sequence of encoding pulses occurring in a pseudo-random pattern, means for modulating the phase of the continuous wave output signal in accordance with the occurrence of the pseudo-random encoding pulses, means for radiating the phase-modulated output signal toward a target and for receiving a phase-modulated output signal from the target corresponding to the radiated phase modulated signal resonant means responsive to pass only the signals received in a selected frequency range, phase-demodulating means interposed between said resonant means and said receiving means means including a second pseudo-random pulse-generator for controlling the operation of the phase-demodulating means in accordance with the occurrence of pulses in the pseudo-random pattern to convert the signal received from the target to a signal of invariable phase, and means including time delay means included in said controlling means and adjustable in accordance with the range between the target and the radiating and receiving means to cause the control of the phase-demodulating means to coincide with phase modulations in the received signals for the passage of a signal of substantially invariable phase in the selected frequency range to the resonant means for the production of indications as to parameters of the target relative to the radiating and receiving means in accordance with the adjustment in the time delay means.