Dual-frequency, remote 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, dual-frequency, ocean wave spectrometer radar system for measuring the characteristics of ocean surface gravity waves includes: a transmitter for transmitting a pair of closely spaced, coherently related, microwave frequencies; a receiver for receiving and separating the radar-return signals of the dual-frequency channels; a frequency shifter for offsetting the doppler spectrum of each radar return signal; and a multiplier for multiplying the radar-return signals of the dual-frequency channels to obtain a Bragg resonance condition indicating the presence of a particular gravity wave frequency on the ocean surface.
Claims12
An ocean-wave spectrometer radar system comprising:
- transmitter means, having closely spaced, coherently related, dual-frequency channels, for generating a first local-oscillator frequency and for transmitting a pair of closely spaced microwave frequencies:
- coherent receiver means for receiving and separating the radar returns of said transmitter dual-frequency channels;
- frequency-shifter means connected to said transmitter means and said receiver means for shifting the frequency of said first local-oscillator frequency;
- and
- multiplier means receiving said separated radar returns from said receiver and multiplying said separated radar returns to obtain a Bragg resonance condition.
An ocean-wave spectrometer radar system comprising:
- trnasmitter means, having closely spaced, coherently related, dual-frequency, transmitter channels and including a microwave signal generator, for transmitting a pair of closely spaced microwave frequencies and generating a first local-oscillator frequency;
- coherent receiver means, including phase-matching circuitry, for receiving and separating radar returns from said transmitter dual-frequency channels;
- frequency shifter means connected to said microwave signal generator and said phase-matching circuitry, for shifting the frequency of said first local-oscillator frequency;
- and
- multiplier means for receiving said separated radar returns from said receiver and multiplying said separated radar returns.
An ocean-wave spectrometer radar system comprising:
- transmitter means, having closely and variably spaced, coherently related, dual-transmitter channels and including a microwave signal generator, for transmitting a pair of closely and variably spaced microwave frequencies and generating a first local-oscillator frequency;
- coherent receiver means, including phase-matching circuitry, for receiving and separating radar returns from said transmitted dual-frequency channels;
- frequency shifter means connected to said microwave signal generator and said phase-matching circuitry for shifting the frequency of said first local-oscillator frequency;
- and
- multiplier means for receiving said separated radar returns from said receiver and multiplying said separated radar returns.
A method for determining the spectrum of capillary wave modulation patterns induced by ocean gravity waves comprising the steps of:
- transmitting a pair of closely and variably spaced microwave frequencies;
- generating a first local-oscillator frequency related to said transmitted frequencies;
- shifting said first local-oscillator frequency;
- coherently detecting radar returns of said pair of transmitted frequencies and utilizing said first localoscillator frequency in said coherent detection;
- and
- multiplying said coherently detected radar returns of both frequency channels to obtain a Bragg resonance.
Dependencies are inferred from the claim text.