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A Moving Target Detection and Processing Method of Radar Data Based on Tracking Filter

A tracking filter and moving target detection technology, applied in radio wave measurement systems, instruments, etc., can solve any problem falling between two adjacent filters, limit the number of MTD filter channels, and suppress clutter failure and other problems, achieve the maximum coherent processing gain, flexible design method, and reduce the effect of false alarm rate

Active Publication Date: 2016-07-06
NANJING LES ELECTRONICS EQUIP CO LTD
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Problems solved by technology

[0005] The existing MTD technology has the following disadvantages: (1) Since the radar data is constrained by the CPI, there is only a limited number of CPI data in one beam, which limits the number of filter channels of the MTD, and the limited filter channels cannot completely Covering all frequency domains, there must be crossover and crossover between two adjacent filters
(2) In traditional MTD processing, the center position of the filter bank is fixed, and the Doppler frequency of the moving target may fall anywhere between two adjacent filters, so signal loss will occur
MTD performance is directly affected by spanning loss and crossing loss, which will lead to failure of clutter suppression in the case of severe loss

Method used

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  • A Moving Target Detection and Processing Method of Radar Data Based on Tracking Filter

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Embodiment Construction

[0043] Such as figure 1 Shown, the specific implementation steps of the present invention are as follows:

[0044] 1. The signal after the pulse pressure is preprocessed to remove the interference and clutter in the signal. Including narrow pulse interference in the time domain, strong signal sidelobe interference under sidelobe suppression, single-cycle asynchronous interference, etc., according to the characteristics of the interference, perform relevant anti-interference processing. For processing methods, refer to the relevant literature on anti-interference (for example: Wan Xianrong et al. Research on the same-frequency and asynchronous interference suppression method for an air intelligence radar, Journal of Electronics, 2012(3)).

[0045] 2. Multi-channel filter banks are used for MTD processing of data. The filtering is divided into two states: detection and tracking: the detection state uses M-channel ordinary MTD filter banks to output the target signal of M-channe...

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Abstract

The invention discloses a radar data moving-target detection processing method based on a tracking filter. The method comprises the following steps: (1) conducting signal preprocessing on a pulse pressure signal; (2) filtering the signal obtained in the step (1), wherein filtration is divided into a detection state and a tracking state, in the detection state, M MTD filters are adopted to output target signals of M Doppler frequency channels, and in the tracking state, a tracking filter is adopted for filtering specified Doppler frequency signals; (3) conducting clutter map processing on output data in the step (2); (4) conducting constant false-alarm processing on a result of the step (3); (5) analyzing and calculating the clutter property, classifying clusters, adopting detecting thresholds in various corresponding clutter areas, and conducting target detection; (6) synchronizing detection signals of the same distance element of various channels to obtain a target detection result of a distance unit.

Description

technical field [0001] The invention relates to a radar data processing method, in particular to a tracking filter-based radar data moving target detection (MTD, MovingTargetDetect, MTD) processing method. Background technique [0002] Moving target detection (MovingTargetDetect, MTD) is an important technology of clutter suppression in radar signal processing. Clutter in radar signal processing includes ground clutter, sea clutter, weather clutter, etc. MTD processing is to carry out coherent accumulation and matched filtering on the radar echo signal, which is characterized by a good ability to suppress dynamic clutter and improve the signal-to-noise ratio of the target. MTD processing uses a narrow-band Doppler filter bank to cover the entire radar repetition frequency range. Because the Doppler frequencies of clutter and targets are different, they appear in different narrow-band filters, which can easily filter out clutter, Preserve the signal, thereby improving the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/414
Inventor 龙超林学黄绍斌赵春光
Owner NANJING LES ELECTRONICS EQUIP CO LTD
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