Stepped dual-frequency, ocean-wave spectrometer
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJohn W. Wright, William J. Plant, Dale L. Schuler
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Abstract
A coherent stepped dual-frequency, ocean-wave, spectrometer radar system for measuring the characteristics of ocean-surface gravity waves includes: a transmitter for transmitting in successive steps coherently related pairs of frequencies having different, small, and known frequency separations; a coherent receiver for receiving and separating the radar returns of the stepped pairs of frequencies, a frequency-shifter for offsetting the doppler spectrum of each radar return, a multiplier for multiplying together the two frequencies of each pair for each step to obtain a Bragg resonance condition for each step; and a plurality of stepped detectors each for detecting a different step of said multiplier output.
Claims13
An ocean-wave, spectrometer radar system comprising:
- transmitter means for generating a first local oscillator frequency and a sync signal, and for transmitting, in successive steps, coherently related pairs of frequencies having different, small, and known frequency separations;
- coherent receiver means for receiving and separating the radar returns of said stepped pairs of frequencies;
- frequency-shifter means connected between said transmitter means and said receiver means for shifting the frequency of said first local-oscillator frequency;
- multiplier means receiving said separated radar returns for said stepped pairs of frequencies from said receiver and multiplying said separated radar returns to obtain a Bragg resonance condition for each step;
- a plurality of stepped detector means, each receiving a sync signal from said transmitter and the output of said multiplier, each for detecting a different step of said multiplier output.
- utilization means receiving the outputs of said stepped detector means, for processing and utilizing the outputs of said stepped detector means.
An ocean-wave spectrometer radar system comprising:
- transmitter means for generating a first local oscillator frequency and a sync signal, and for transmitting, in successive steps, coherently related pairs of frequencies having different, small, and known frequency separations;
- coherent receiver means for receiving and separating the radar returns of said stepped pairs of frequencies;
- frequency shifter means connected between said transmitter means and said receiver means for shifting the frequency of said first local oscillator frequency;
- multiplier means receiving said separated radar returns from said stepped pairs of frequencies from said receiver and multiplying said separated radar returns to obtain a Bragg resonance condition for each step;
- recorder means for recording the output of said multiplier means and the sync signal from transmitter means;
- and
- stepped detector means receiving said sync signal and said multiplier output from said recorder for serially detecting the steps of said multiplier output;
- utilization means receiving the output of said stepped detector means, for processing and utilizing the outputs of said stepped detector means.
An ocean-wave, spectrometer radar system comprising:
- transmitter means including a microwave signal generator, for generating a first local oscillator frequency and a sync signal, and for transmitting, in successive steps, coherently related pairs of frequencies having different, small, and known frequency separations;
- coherent receiver means, including phase-matching circuitry, for receiving and separating radar returns from said stepped pairs of frequencies;
- frequency shifter means recieving the output of said microwave signal generator and providing a frequency-shifted first local-oscillator frequency to said phase-matching circuitry;
- and
- multiplier means for receiving said separated radar returns from said stepped pairs of frequencies from said receiver and multiplying said separated radar returns to obtain a Bragg resonance condition for each step;
- a plurality of stepped detector means, each receiving a sync signal from said transmitter and the output of said multiplier, each for detecting a different step of said multiplier output;
- utilization means receiving the outputs of said stepped detector means for processing and utilizing the outputs of said stepped detector means.
Dependencies are inferred from the claim text.