STAP-based high-speed air maneuvering target detection method

A technology of maneuvering targets and detection methods, applied in radio wave measurement systems, instruments, etc., can solve problems such as detection performance degradation, achieve the effect of simple method, accurate detection, and effective accumulation

Inactive Publication Date: 2011-12-21
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

However, it is only aimed at high-speed targets moving at a constant speed. When the target is maneuvering, the secondary phase term caused by the radial acceleration will produce time-varying modulation on the echo signal. At this time, the detection performance of this method will be greatly reduced.

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Embodiment 1

[0033] Refer to attached Figure 1 to Figure 9 .

[0034] The STAP-based high-speed air maneuvering target detection method of the present invention combines STAP technology with Keystone transform and Wigner-Hough transform ingeniously to realize that the target has serious distance walking, Doppler ambiguity and Doppler walking. moving target detection. like figure 1 shown, including the following steps:

[0035] Step 1: Estimate the clutter covariance matrix of the unit under test based on the data of the reference unit.

[0036] Consider the airborne platform placed along the heading direction Element uniform linear array, array element spacing is , is the working wavelength, and emits within one coherent processing time 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 matrix, assuming that the number of sampling points along the distance direction ...

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Abstract

The invention relates to a high-speed air maneuvering target detection method based on STAP (Spacetime Adaptive Processing), belonging to the technical field of maneuvering target detection. The detection method comprises the following steps of: (1) estimating a clutter covariance matrix of a unit to be detected according to data of a reference unit; (2) multiplying an inverse matrix of the clutter covariance matrix with received data to realize clutter suppression; (3) performing Keystone conversion correction target distance walking on data which are subjected to clutter suppression; (4) performing airspace beam forming on data which are subjected to Keystone conversion correction target distance walking; (5) performing Wignet-Hough conversion on the obtained data to estimate a target acceleration; (6) performing Doppler walking compensation on the acceleration obtained by estimating the data which are subjected to Keystone conversion correction target distance walking obtained in the step (3) according to the step (5); and (7) performing spacetime two-dimensional beam forming on the obtained data to realize target accumulative detection. The method has the advantages of easiness, accurate detection, suitability for severe distance walking of the target, movable target detection during Doppler ambiguity and Doppler walking, and the like.

Description

technical field [0001] The invention belongs to the technical field of maneuvering target detection, in particular to a STAP-based high-speed aerial maneuvering target detection method. Background technique [0002] Airborne early warning radar is the main sensor and intelligence source of early warning aircraft. Early warning radar plays an important role in modern warfare with the development of information technology. With the background of phased array airborne early warning radar, the target detection problem of high-speed air maneuvering (only considering the radial acceleration) is mainly studied. The main difficulties in detecting this type of target are: a. When the airborne early warning radar looks down, the weak target signal is often submerged in the strong ground clutter caused by the broadening of the Doppler spectrum due to the movement of the platform, and only a single channel is used to receive the signal. The Doppler processing method of the echo signal...

Claims

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Application Information

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Patent Type & Authority Applications(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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