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Target signal detection method based on improved COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate)

A technology of target detection and detection method, applied in the field of communication, can solve the problems of missed target detection and insufficient detection performance of clutter edges, and achieve the effect of improving gain and reducing missed detection of clutter.

Inactive Publication Date: 2010-10-27
SHENZHEN KIGLESH TECH
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Problems solved by technology

Its disadvantages are: based on the above method of selecting clutter power, it is easy to ignore some clutter power close to the detection target, resulting in insufficient detection performance of the clutter edge. In multi-target detection, especially when the target distance is small, there is a target leakage inspection phenomenon

Method used

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  • Target signal detection method based on improved COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate)
  • Target signal detection method based on improved COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate)
  • Target signal detection method based on improved COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate)

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Embodiment Construction

[0037] The portable individual radar transmits a linear frequency modulation continuous wave signal, and the transmitted signal in one repetition period is expressed as:

[0038] s ( t ^ , t m ) = rect ( t ^ T p ) e j 2 π ( f c t + 1 2 γ t ^ 2 ) - - - ( 1 - 1 ...

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Abstract

The invention discloses a COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate) detection method in the work adopting a continuous wave system radar. In the COSGO-CFAR detection, firstly, n reference units in a left reference window and a right reference window of a target detection unit are sequenced from small to large according to powder; the left reference window and the right reference window respectively selects powers of former n-k units as clutter average power to respectively obtain two average clutter powders of the left reference window and the right reference window; the greater power of the two obtained average clutter powders is selected as the clutter power; and then the greater power is multiplied with a normalization threshold to obtain a real detection threshold, and the real detection threshold is compared with the power of the target detection unit to obtain a comparison result. The COSGO-CFAR detection method provided in the working adopting the continuous wave system radar realizes two-dimensional coherence accumulation through distance IFFT (Inverse Fast Fourier Transform) pulse pressure and orientation FFT (Fast Flourier Transform) pulse pressure, improves the target signal to noise ratio gain, and reduces the clutter detection omission under multi-object detection.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a new detection technology of average sequence statistics selection-constant false alarm proposed in the work of continuous wave system radar, so as to improve the detection probability of the target. Background technique [0002] In the currently used average order statistics-constant false alarm detection, first sort the 2n reference units in the left and right reference windows of the target from small to large, select the power of the first 2n-2k order units as the average power of clutter, and then normalize After the thresholds are multiplied, the real detection threshold is obtained and compared with the detection unit. The average order statistics-constant false alarm detection processing flow is as follows Figure 11 shown. Its defect is that based on the above method of selecting clutter power, it is easy to ignore some clutter power close to the detection targe...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 钟志诚焦利强
Owner SHENZHEN KIGLESH TECH
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