US6717545B2
Expired / Lapsed
US
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Adaptive system and method for radar detection
Assignee: Raytheon Canada Ltd
•
Filing: 2003-03-07
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Granted: 2004-04-06
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Expires: 2023-03-07
Abstract
Abstract This invention relates to an adaptive detection system and method for analyzing range-doppler-azimuth data for target detection. The detection system has a threshold calculator for calculating a threshold value that is based on the standard deviation of the range-doppler-azimuth data and a predetermined probability of detection. The detection system also has a detection module in communication with the threshold calculator to receive the threshold value. The detection module calculates an estimated target amplitude and an estimated noise floor amplitude based on the range-doppler data that is located in a detection window. The detection module detects a target when the difference between the estimated target amplitude and the estimated noise floor amplitude is larger than the threshold value.
Inventors
- 👤 Reza Dizaji
- 👤 Tony Ponsford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:33
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/5244; G01S13/0209; G01S13/06; G01S13/08; G01S13/10; G01S13/30; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/2923; G01S7/2927; G01S7/288; G01S7/2883
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
100 words
An adaptive detection system for analyzing range-doppler-azimuth data for target detection, said system comprising: a) a threshold calculator for calculating a threshold value based on the standard deviation of said range-doppler-azimuth data and a predetermined probability of detection; and, b) a detection module in communication with said threshold calculator for receiving said threshold value wherein, said detection module calculates an estimated target amplitude and an estimated noise floor amplitude from range-doppler data located in a detection window and detects a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than said threshold.
Claim 2
Dependent Claim
100 words
An adaptive detection system for analyzing range-doppler-azimuth data for target detection, said system comprising: a) a threshold calculator for calculating a threshold value based on the standard deviation of said range-doppler-azimuth data and a predetermined probability of detection; and, b) a detection module in communication with said threshold calculator for receiving said threshold value wherein, said detection module calculates an estimated target amplitude and an estimated noise floor amplitude from range-doppler data located in a detection window and detects a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than said threshold.
Claim 3
Dependent Claim
71 words
The system of claim 1 , wherein said detection module comprises: i) a window generator for generating said detection window, said detection window having a target region, a guard region and a main region; ii) a signal calculator in communication with said window generator, for calculating said estimated target amplitude and said estimated noise floor amplitude; and iii) a decision module in communication with said signal calculator, for detecting said target.
Claim 4
Dependent Claim
31 words
The system of claim 2 , wherein said detection module further comprises a storage module in communication with said decision module, for storing location and amplitude information for a detected target.
Claim 5
Dependent Claim
21 words
The system of claim 3 , wherein said amplitude information is the average of range-doppler cell amplitudes in said target region.
Claim 6
Dependent Claim
55 words
The system of claim 2 , wherein said guard region surrounds said target region and said main region surrounds said guard region, and said estimated target amplitude is a range-doppler cell amplitude at the center of said target region and said estimated noise floor amplitude is an average range-doppler cell amplitude in said main region.
Claim 7
Dependent Claim
19 words
The system of claim 2 , wherein the size of said target region is varied based on detection mode.
Claim 8
Dependent Claim
19 words
The system of claim 2 , wherein the size of said guard region is varied based on detection mode.
Claim 9
Dependent Claim
19 words
The system of claim 2 , wherein the size of said main region is varied based on detection mode.
Claim 10
Dependent Claim
60 words
The system of claim 1 , wherein said threshold calculator calculates said standard deviation (σ) of said range-doppler-azimuth data and calculates said threshold value (λ) according to the equation λ=X·σ where X is a value obtained from a percentile in a table of percentiles for a χ 1.5 distribution and said percentile is equal to said predetermined probability of detection.
Claim 11
Dependent Claim
132 words
A detection module for analyzing range-doppler data for target detection, said detection module comprising: a) a window generator for generating a detection window having a target region, a guard region surrounding said target region and a main region surrounding said guard region; b) a signal calculator in communication with said window generator, for calculating an estimated target amplitude and an estimated noise floor amplitude, wherein said estimated target amplitude is a range-doppler cell amplitude at the center of said target region and said estimated noise floor amplitude is an average range-doppler cell amplitude in said main region; c) a decision module in communication with said signal calculator, for detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than a predetermined threshold value.
Claim 12
Dependent Claim
132 words
A detection module for analyzing range-doppler data for target detection, said detection module comprising: a) a window generator for generating a detection window having a target region, a guard region surrounding said target region and a main region surrounding said guard region; b) a signal calculator in communication with said window generator, for calculating an estimated target amplitude and an estimated noise floor amplitude, wherein said estimated target amplitude is a range-doppler cell amplitude at the center of said target region and said estimated noise floor amplitude is an average range-doppler cell amplitude in said main region; c) a decision module in communication with said signal calculator, for detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than a predetermined threshold value.
Claim 13
Dependent Claim
31 words
The detection module of claim 10 , wherein said module further includes a storage module in communication with said decision module, for storing location and amplitude information for a detected target.
Claim 14
Dependent Claim
22 words
The detection unit of claim 11 , wherein said amplitude information is the average of range-doppler cell amplitudes in said target region.
Claim 15
Dependent Claim
20 words
The detection unit of claim 10 , wherein the size of said target region is varied based on detection mode.
Claim 16
Dependent Claim
20 words
The detection unit of claim 10 , wherein the size of said guard region is varied based on detection mode.
Claim 17
Dependent Claim
20 words
The detection unit of claim 10 , wherein the size of said main region is varied based on detection mode.
Claim 18
Dependent Claim
80 words
An adaptive detection method for analyzing range-doppler-azimuth data for target detection, said method comprising: a) calculating a threshold value based on the standard deviation of said range-doppler-azimuth data and a predetermined probability of detection; b) calculating an estimated target amplitude and an estimated noise floor amplitude based on range-doppler data contained in a detection window; and, c) detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than said threshold value.
Claim 19
Dependent Claim
80 words
An adaptive detection method for analyzing range-doppler-azimuth data for target detection, said method comprising: a) calculating a threshold value based on the standard deviation of said range-doppler-azimuth data and a predetermined probability of detection; b) calculating an estimated target amplitude and an estimated noise floor amplitude based on range-doppler data contained in a detection window; and, c) detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than said threshold value.
Claim 20
Dependent Claim
30 words
The method of claim 16 , wherein step b) includes generating said detection window to provide range-doppler data for calculating said estimated target amplitude and said estimated noise floor amplitude.
Claim 21
Dependent Claim
36 words
The method of claim 17 , wherein generating said detection window comprises: a) generating a target region; b) generating a guard region surrounding said target region; and, c) generating a main region surrounding said guard region.
Claim 22
Dependent Claim
25 words
The method of claim 18 , wherein calculating said estimated target amplitude comprises obtaining the range-doppler cell amplitude at the center of said target region.
Claim 23
Dependent Claim
24 words
The method of claim 18 , wherein calculating said estimated noise floor amplitude comprises calculating the average range-doppler cell amplitude in said main region.
Claim 24
Dependent Claim
19 words
The method of claim 18 , wherein generating said target region comprises selecting a size based on detection mode.
Claim 25
Dependent Claim
19 words
The method of claim 18 , wherein generating said guard region comprises selecting a size based on detection mode.
Claim 26
Dependent Claim
19 words
The method of claim 18 , wherein generating said main region comprises selecting a size based on detection mode.
Claim 27
Dependent Claim
23 words
The method of claim 18 , wherein storing said amplitude information comprises calculating the average of range-doppler cell amplitudes in said target region.
Claim 28
Dependent Claim
21 words
The method of claim 16 , wherein said method further comprises: d) storing location and amplitude information for a detected target.
Claim 29
Dependent Claim
63 words
The method of claim 16 , wherein calculating said threshold value comprises: a) calculating the standard deviation (σ) of said range-doppler-azimuth data; b) selecting a value (X) from a percentile in a table of percentiles for a χ 1.5 distribution wherein said percentile is equal to said predetermined probability of detection; and, c) calculating said threshold value (λ) according to the equation λ=X·σ.
Claim 30
Dependent Claim
108 words
A detection method for analyzing range-doppler data for target detection, said method comprising: a) generating a detection window having a target region, a guard region surrounding said target region and a main region surrounding said guard region; b) calculating an estimated target amplitude and an estimated noise floor amplitude, wherein said estimated target amplitude is a range-doppler cell amplitude at the center of said target region and said estimated noise floor amplitude is an average range-doppler cell amplitude in said main region; and, c) detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than a predetermined threshold value.
Claim 31
Dependent Claim
108 words
A detection method for analyzing range-doppler data for target detection, said method comprising: a) generating a detection window having a target region, a guard region surrounding said target region and a main region surrounding said guard region; b) calculating an estimated target amplitude and an estimated noise floor amplitude, wherein said estimated target amplitude is a range-doppler cell amplitude at the center of said target region and said estimated noise floor amplitude is an average range-doppler cell amplitude in said main region; and, c) detecting a target when the difference between said estimated target amplitude and said estimated noise floor amplitude is larger than a predetermined threshold value.
Claim 32
Dependent Claim
21 words
The method of claim 27 , wherein said method further comprises: d) storing location and amplitude information for a detected target.
Claim 33
Dependent Claim
23 words
The method of claim 28 , wherein storing said amplitude information includes calculating the average of range-doppler cell amplitudes in said target region.
Claim 34
Dependent Claim
19 words
The method of claim 27 , wherein the size of said target region is varied based on detection mode.
Claim 35
Dependent Claim
19 words
The method of claim 27 , wherein the size of said guard region is varied based on detection mode.
Claim 36
Dependent Claim
19 words
The method of claim 27 , wherein the size of said main region is varied based on detection mode.
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