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US 5,808,580 AGranted
Radar/sonar system concept for extended range-doppler coverage
OwnerGrealie A. Andrews, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A method and apparatus for preventing the occurrence of range ambiguities and Doppler ambiguities in both a radar and sonar environment. A series of N pulses are produced, each of which contains a number of contagious subpulses. Each of the subpulses exhibit a different frequency than the remaining subpulses in that particular pulse. Furthermore, the order of appearance of the subpulses in each of the pulses is unique with respect to the remaining pulses in the series. A matched filter receiver and Doppler processor are used to provide auto correlations and cross correlations to prevent the range ambiguities and Doppler ambiguities.
Claims46
A radar system for determining the range and velocity of one or more targets, comprising:
- a code device for producing at least one series of N radio frequency pulses directed at the targets, each of said pulses separated from adjacent pulses by a time T, each of said pulses containing a plurality of M contiguous subpulses, each of said M subpulses in each of said pulses exhibiting a different frequency than the remaining subpulses in that particular pulse, and further wherein the order of appearance of said M subpulses in each of said pulses is unique with respect to the remaining pulses in said series of N pulses;
- a transmitter connected to said code device for transmitting said at least one series of N pulses directed at the targets;
- and
- a receiver for receiving said at least one series of N pulses reflected from the targets,
- said receiver including a plurality of delay devices, each of said delay devices storing one of said N pulses for a time T;
- a plurality of correlators, each of said correlators connected to either an input of said receiver or one of said delay devices, each of said correlators provided with a replica of one of said N pulses, each of said correlators producing either an auto-correlation or cross-correlation output;
- and
- a Doppler processor for processing said auto-correlation and said cross-correlation outputs of said plurality of correlators to produce both range and velocity measurements of the targets without range ambiguities and Doppler ambiguities.
5 more elements
A sonar system for determining the range and velocity of one or more targets, comprising:
- a code device for producing at least one series of N sonar pulses directed at the targets, each of said pulses separated from adjacent pulses by a time T, each of said pulses containing a plurality of M contiguous subpulses, each of said M subpulses in each of said pulses exhibiting a different frequency than the remaining subpulses in that particular pulse, and further wherein the order of appearance of said M subpulses in each of said pulses is unique with respect to the remaining pulses in said series of N pulses;
- a transmitter connected to said code device for transmitting said at least one series of N pulses directed at the targets;
- a receiver for receiving said at least one series of N pulses reflected from the targets, a plurality of delay devices, each of said delay devices storing one of said N pulses for a time T;
- a plurality of correlators, each of said correlators connected to either said receiver or one of said delay devices, each of said correlators provided with a replica of one of said N pulses, each of said correlators producing either an auto-correlation or cross-correlation output;
- and
- a Doppler processor for processing said auto-correlation and said cross-correlation outputs of said plurality of correlators to produce both range and velocity measurements of the targets without range ambiguities and Doppler ambiguities.
3 more elements
A method for determining the range and velocity of one or more targets utilizing radar comprising:
- producing at least one series of N radio frequency pulses directed at the targets, each of said pulses separated from adjacent pulses by a time T, each of said pulses containing a plurality of M contiguous subpulses, each of said M subpulses in each of said pulses exhibiting a different frequency than the remaining subpulses in that particular pulse, and further wherein, the order of appearance of said M subpulses in each of said pulses is unique with respect to the remaining pulses in said series of N pulses;
- transmitting said at least one series of N radio frequency pulses directed at the targets;
- receiving said at least one series of N pulses reflected from the targets;
- storing each of said N pulses for a time T in a plurality of delay devices;
- sending each of said N pulses from a respective delay device to individual correlators each of which is provided with a replica of one of said N pulses;
- producing from each of said correlators an auto-correlations output or a cross-correlation output;
- processing in a Doppler processor said auto-correlation outputs and said cross-correlation outputs to produce both range and velocity measurements of the targets without range ambiguities and Doppler ambiguities.
4 more elements
A method for determining the range and velocity of one or more target utilizing sonar comprising:
- producing at least one series of N sonar pulses directed at the targets, each of said pulses separated from adjacent pulses by a time T, each of said pulses containing a plurality of M contiguous subpulses, each of said M subpulses in each of said pulses exhibiting a different frequency than the remaining subpulses in that particular pulse, and further wherein, the order of appearance of said M subpulses in each of said pulses is unique with respect to the remaining pulses in said series of N pulses;
- transmitting said at least one series of N radio frequency pulses directed at the targets;
- receiving said at least one series of N pulses reflected from the targets;
- storing each of said N pulses for a time T in a plurality of delay devices;
- sending each of said N pulses from a respective delay device to individual correlators each of which is provided with a replica of one of said N pulses;
- producing from each of said correlators an auto-correlations output or a cross-correlation output;
- processing in a Doppler processor said auto-correlation outputs and said cross-correlation outputs to produce both range and velocity measurements of the targets without range ambiguities and Doppler ambiguities.
4 more elements
Dependencies are inferred from the claim text.