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Improved constant false alarm rate detecting method for ship-borne linear frequency modulation continuous wave radar

A technology of constant false alarm detection and linear frequency modulation, which is applied in the field of signal processing, can solve the problems of complex mean calculation, and the robust algorithm is not suitable for low-cost implementation, and achieves the effect of avoiding the shadowing effect.

Active Publication Date: 2014-12-24
WUHAN ZHONGYUAN ELECTRONICS GRP
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Problems solved by technology

However, these algorithms are at the cost of increasing the amount of calculation. For example, OS-CFAR needs to perform sorting statistics, which is much more complicated than the mean calculation of CA-CFAR.
So robust algorithms such as OS-CFAR are not suitable for low-cost implementation

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  • Improved constant false alarm rate detecting method for ship-borne linear frequency modulation continuous wave radar
  • Improved constant false alarm rate detecting method for ship-borne linear frequency modulation continuous wave radar
  • Improved constant false alarm rate detecting method for ship-borne linear frequency modulation continuous wave radar

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Embodiment Construction

[0068] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0069] An improved constant false alarm detection method for shipborne LFM continuous wave radar, comprising the following steps:

[0070] Step 1, set the constant false alarm probability P expected by the constant false alarm detection method of shipborne LFM continuous wave radar A .

[0071] Step 2, the echoes received by the radar receiver on each echo scanning line and the echoes of different distance bins on each echo scanning line are processed by Doppler to obtain the maximum value of each Doppler channel energy and stored in a two-dimensional data matrix, such as image 3 shown. The two-dimensional data matrix has two dimensions of distance and azimuth. The row direction of the two-dimensional data matrix is ​​called the distance direction of the matrix, and the column direction of the two-d...

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Abstract

The invention discloses an improved constant false alarm rate detecting method for a ship-borne linear frequency modulation continuous wave radar and belongs to the field of signal processing. The method includes: the maximum value of each Doppler channel energy after Doppler treatment of each distance unit is used as the input of a two-dimensional reference window; judgment is performed twice, targets and backgrounds are preliminarily distinguished through the first judgment, and before the second judgment, the units judged as the targets by the first judgment are removed during energy average value calculation of the distance units. Compared with traditional CA_CFAR, the method has the advantages that the defect of mutual shielding of adjacent targets is overcome, the advantage of low calculation complexity of the traditional CA_CFAR is kept, and both detection performance and software-hardware implementation cost are considered.

Description

technical field [0001] The method belongs to the field of signal processing, and in particular relates to a constant false alarm detection method. technical background [0002] The real radar clutter intensity changes with time, distance and azimuth. Using a fixed threshold will lead to a high rate of missed detection or false alarm rate; modern radars mostly use constant false alarm detectors, so that the detection threshold varies with background noise, clutter and interference. Adaptively adjust to ensure a constant false alarm rate. The key to the design of constant false alarm rate detector lies in the method of adaptive adjustment of detection threshold. [0003] The commonly used CA (Cell Average, unit average)-CFAR constant false alarm detection algorithm sums the energy of the units near the detected unit (called the reference unit) and divides it by the number of reference units to estimate the mean value of clutter and noise energy Z , and then multiplied by a c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 张东华任学锋龚涛李宁
Owner WUHAN ZHONGYUAN ELECTRONICS GRP
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