Simplified system for estimating pulse radar doppler frequency
AssigneeThe United States of America as represented by the Secretary of the Army
InventorRobert K. Dahlin
Life of this patent
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Abstract
A method for determining doppler frequency by the measurement of the maxi pulse-to-pulse difference over one doppler cycle. A box-carred (sample-and-hold) phase detector's output is differentiated to obtain pulses whose amplitude represents the amplitude of individual boxcar transitions. The largest pulse amplitude is selected for indication of doppler frequency.
Claims4
In a system having a staircase waveform signal which is amplitude modulated in essentially a sinusoidal manner, the improvement comprises a method of rapidly determining the frequency of the sinusoidal waveform by the steps of:
- differentiating the staircase waveform signals so as to get a train of pulses whose amplitude corresponds to the waveform;
- dividing this train into a plurality of channels;
- utilizing a sample and hold circuit each channel to retain the amplitude of the pulse in that channel;
- selecting the highest valued pulse in the sampling and hold circuits;
- and using the pulse amplitude to define the sinusoidal waveform frequency.
Dependencies are inferred from the claim text.