Motorola Corporation

Guy Vernon Morris

Eric Alexander Dounce

Maurice Bernard Aufderheide

An improvement in a pulsed radar system providing coherent-on-receive signals utilizing digital techniques. The phase of the transmitted signal is compared to the phase of a stable local oscillator and the phase relationship is converted to a complex digital number which is then stored in a suitable short term memory. The received signals are also converted to complex digital numbers containing both the phase relationship to the stable local oscillator and the amplitude of the return video signal. The digitized received signals are then digitally phase corrected to provide coherence using the stored complex digital numbers for the correction.

Digital phase correction for coherent-on-receive pulsed radar system

A digital filter for generating a frequency domain output signal in response to an incoming signal arriving in successive receiving cycles whenever the incoming signal has any frequency component lying within the passband of the filter. A means for generating a timing signal is provided. An analog-to-digital converter responsive to the timing signal converts the incoming analog signal into a series of digital input pulses during each range gate interval. A reference generator responsive to the timing signal provides a train of digital reference pulses for each of the successive receiving cycles. A predetermined number of successive receiving cycles constitutes a single correlation frame. The amplitude of each train of digital reference pulses is determined by a composite correlation function. A multiplier multiplies each digital reference pulse with each digital input pulse to generate a train of discrete digital output pulses for each receiving cycle. An accumulator stores the discrete digital output pulses from the multiplier and generates a frequency domain output signal for each frame of reference pulses. The digital filter can also be constructed with either a two-channel or four-channel processor to provide a more sophisticated filter system.

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Scottsdale, AZ, United States of America

Guy Vernon Morris