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Improved two-dimension constant false alarm method

A two-dimensional constant false alarm and maximum value technology, applied in the field of signal processing, can solve problems such as complex data access control, achieve the effect of reducing memory requirements and reducing the complexity of operations

Active Publication Date: 2012-12-12
CHENGDU SEEKCON MICROWAVE COMM
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Problems solved by technology

But for two-dimensional radar signal processing, the filter output not only has time-domain components, but also has frequency-domain components, so the two-dimensional constant false alarm detection circuit should be two-dimensional CFAR detection in both time domain and frequency domain. The circuit requires CFAR processing for each filter channel formed by FFT in the distance direction, and at the same time, the N pulse data of each distance unit should also be CFAR processed in the frequency domain. This method affects the access speed and capacity of the memory. Both have very high requirements, and at the same time require a lot of memory, so the control of data access is very complicated

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Embodiment Construction

[0016] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

[0017] Such as figure 1 As shown, the improved two-dimensional constant false alarm method provided by the present invention comprises the following steps:

[0018] First, the radar transmits N pulse Doppler signals, and each pulse Doppler signal is distributed in M ​​range units; the FFT operation is performed on the echo signals of the N pulse Doppler signals in each range unit to obtain N data, select the maximum value X from the above N data i , and then the maximum value X i Stored in the cache unit, the address of the cache corresponds to each distance unit; the maximum value of M stored in the cache unit X i Send them to the one-dimensional constant false alarm detection circuit in batches for constant false alarm processing. The specific processing process is as follows: figure 2 Shown:

[0019] There is a sliding window before and afte...

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Abstract

The invention discloses an improved two-dimension constant false alarm method. According to the method, FFT (fast Fourier transform) calculation is carried out N pulse Doppler signals in each distance unit, the maximum value is found out, in addition, the maximum value is stored into a buffer memory unit according to the address of the corresponding distance unit, then, M maximum values Xi stored in the buffer memory are subjected to one-dimension constant false alarm processing, and the target detection is completed. According to the method, only the maximum values of each distance unit after the FFT operation are stored, so the requirement can be met only through the small buffer unit, a half of memory requirement and operation complexity can be reduced, and in addition, the effect similar to the existing two-dimension constant false alarm method is reached.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to an improved two-dimensional constant false alarm method. Background technique [0002] The constant false alarm detection (CFAR) circuit uses an adaptive detection threshold to keep the false alarm probability constant when detecting the target. General signal processing only performs CFAR detection in the time domain, using the unit average constant false alarm detection circuit. This method is to have a sliding window covering several distance units before and after the detection unit, which is used to calculate the average value of the output amplitude and detect A signal amplitude in a cell is considered true if it is greater than the average value within the sliding window. But for two-dimensional radar signal processing, the filter output not only has time-domain components, but also has frequency-domain components, so the two-dimensional constant false alarm det...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292
Inventor 杜成兵叶显唐毅
Owner CHENGDU SEEKCON MICROWAVE COMM
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