Airborne radar clutter suppression method

A clutter suppression, airborne radar technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as inability to real-time processing, increase in sample and calculation amount, and astonishing amount of calculation and equipment. The effect of reducing requirements and computation

Inactive Publication Date: 2009-10-21
XIDIAN UNIV
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Problems solved by technology

[0005] First, due to the tens of thousands of dimensions of the adaptive processor, it is necessary to invert the high-dimensional covariance matrix, and the amount of calculation and equipment is astonishing, which cannot be processed in real time;
[0006] Second, since the covariance matrix needs to be estimated by statistical average, at least 2 times the number of processor dimensions is required to satisfy the independent and i

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Embodiment Construction

[0022] Refer below figure 1 The implementation process of the method of the present invention is described.

[0023] Step 1. Receive the space-time two-dimensional data X, and at the same time give the spatial steering vector s(ω s ) and time-domain steering vector s(ω t ).

[0024] In the present invention, the radar antenna is a uniform linear array structure, and it can also be an equivalent linear array synthesized by microwaves. The number of antenna array elements is N, and the pulse repetition frequency f r K pulses are emitted, without loss of generality, assuming N≤K. The space-time two-dimensional data of the echo signal received in a CPI can be expressed as a N×K two-dimensional data matrix

[0025]

[0026] where x n，m Indicates the m-th echo received by the n-column sub-array, the two-dimensional data in formula (1) contains not only unwanted clutter and noise signals, but also a target signal S to be detected t , where the target signal matrix S t It ca...

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Abstract

The invention discloses an airborne radar clutter suppression method, belonging to the technical field of radar signal processing and aiming at solving the problems of the current clutter suppression technology such as high sample requirement, large calculation amount and poor real-time performance. The implementation steps are as follows: firstly, carrying out clutter pre-processing on the received data according to the prior information of the clutter spectrum distribution to realize dimensional reduction of the space-time bidimensions and reduce the clutter freedom degree; then carrying out cascade connection low-rank adaptive processing and performing multiple filtering and multiple dimensional reduction of the space-time bidimensions on the echoed signal to realize the clutter suppression and target detection of the signals. Indicated by the results of computer simulation analysis and actually measured data processing, the invention has remarkably reduced sample requirement and calculation amount under the precondition of good performance and the filtering performance is greatly improved under the circumstance of equivalent sample requirement, thus the invention can be used in dynamic target detection.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a method for suppressing airborne radar clutter, which can be used for signal detection and moving target recognition. Background technique [0002] Airborne pulse Doppler radar is one of the most important military sensors on the modern battlefield, and moving target detection is an important function of it. Airborne radar is often in the look-down mode, and ground clutter has a serious impact on its detection performance. The ground clutter is not only powerful, but also because the clutter in different directions has different speeds relative to the carrier aircraft, the clutter spectrum is greatly expanded, and the clutter presents a strong space-time coupling characteristic. How to effectively suppress ground clutter is a difficult problem for airborne radar to look down, and it is also a problem that must be solved. With the current level of technology and...

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Application Information

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IPC IPC(8): G01S7/36
Inventor 冯大政李晓明李运锋向聪曹洋王炜贾建超
Owner XIDIAN UNIV
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