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High-speed platform high-speed air moving target detection method based on STAP (Spacetime Adaptive Processing)

A moving target detection, high-speed technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as the influence of two-dimensional characteristics, the difference between target and clutter fuzzy numbers, and reduce the performance of STAP, so as to facilitate engineering implementation and improve computing speed Effect

Inactive Publication Date: 2013-05-15
CIVIL AVIATION UNIV OF CHINA
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AI Technical Summary

Problems solved by technology

However, due to the Doppler ambiguity of the high-speed air-moving target, the ambiguity numbers of the target and the clutter will be different when there is no Doppler ambiguity in the clutter. Wave space-time two-dimensional characteristics affect, thereby reducing STAP performance

Method used

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  • High-speed platform high-speed air moving target detection method based on STAP (Spacetime Adaptive Processing)
  • High-speed platform high-speed air moving target detection method based on STAP (Spacetime Adaptive Processing)
  • High-speed platform high-speed air moving target detection method based on STAP (Spacetime Adaptive Processing)

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Embodiment 1

[0028] Refer to attached Figure 1 to Figure 6 .

[0029] The STAP-based high-speed platform high-speed aerial moving target detection method (KF-STAP method) of the present invention is to utilize figure 1 The shown STAP-based high-speed platform high-speed air moving target detection process is realized, and the specific method is as follows:

[0030] The first step is to perform Keystone transformation on the space-time two-dimensional signal received by the high-speed platform phased array early warning radar to correct the clutter distance.

[0031] Assuming that the airborne / spaceborne platform is placed along the course direction Element uniform linear array, array element spacing is , For the operating wavelength, a CPI emits within pulse, for the first array element at The corresponding complex sampling value on each pulse, then the received data on each range gate can be written as a the matrix , considering that the number of sampling points along...

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Abstract

The invention relates to a high-speed platform high-speed air moving target detection method based on STAP (Spacetime Adaptive Processing), belonging to the technical field of aerial maneuvering target detection. The detection method comprises the following steps of: (1) performing Keystone conversion correction target distance walking on spacetime two-dimensional data received by a high-speed platform phased array radar; (2) estimating a clutter covariance matrix of data subjected to cluster walking correction according to data of a reference unit; (3) multiplying an inverse matrix of the clutter covariance matrix with data subjected to Keystone conversion to realize clutter suppression; (4) switching the suppressed data to a distance frequency domain to prepare for target distance walking compensation; (5) configuring a fuzzy number set according to an aerial moving target speed range and a radar system parameter; (6) configuring a filter group according to the fuzzy number set; and(7) making data obtained in the step (4) pass through the filter group to realize target distance walking correction, and performing spacetime two-dimensional beam foaming on a correction result to realize target accumulation. In the method, a plurality of targets with different fuzzy numbers are detected simultaneously by performing parallel processing; and the method has the advantages of high operation speed, convenience for engineering realization, and the like.

Description

technical field [0001] The invention belongs to the technical field of aerial moving target detection, and in particular relates to a STAP-based high-speed aerial moving target detection method on a high-speed platform. Background technique [0002] The airborne / spaceborne radar is in a down-looking working state, and it faces a more serious problem of ground clutter than ground-based radar. The clutter has a wide distribution range and high intensity; and due to the movement of the platform, the clutter spectrum is greatly expanded, mainly in the main lobe Frequency shift of clutter and broadening of the entire clutter band. Ideally, the space-time two-dimensional clutter spectrum of the front and side arrays is a linear knife-back distribution. The STAP technology proposed by Brennan et al. is an effective ground clutter suppression method. Its core idea is to use the space-time coupling characteristics of clutter to adaptively adjust the response of the two-dimensional f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 吴仁彪贾琼琼李海
Owner CIVIL AVIATION UNIV OF CHINA
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