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Non-adaptive airborne non-side-looking radar short-range clutter suppression method

A short-range clutter, non-adaptive technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of a large number of independent and identically distributed training samples of the covariance matrix, inability to effectively suppress short-range clutter, and high computational complexity , to achieve the effect of small amount of calculation, which is conducive to real-time processing

Inactive Publication Date: 2014-04-23
XIDIAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is: many deficiencies that exist when the existing STAP algorithm is applied to airborne radar clutter suppression, such as high computational complexity, the covariance matrix of estimating clutter requires a large number of independent and identically distributed training samples and cannot effectively To suppress defects such as short-range clutter, the present invention proposes a non-adaptive airborne radar short-range clutter suppression method (SCSA)

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[0019] The implementation process of the method of the present invention will be described below with reference to the accompanying drawings.

[0020] In order to better understand the present invention, the clutter model of the non-side-looking radar is introduced first. figure 1 It is the clutter model diagram of the non-side-looking radar. The M×N planar array is installed on the carrier aircraft, the antennas are co-located for transmitting and receiving, and the intervals between the M×N antennas in the row and column directions are both d. If M array elements in each column are combined by microwave, N synthesis channels can be obtained. The N synthesis channels can be regarded as N uniform linear arrays, which are parallel to the ground ( figure 1 xoy plane in ). Let the working wavelength of the radar be λ, and the pulse repetition frequency be f r . Within a coherent processing interval, K pulses are coherently accumulated. Assume that the carrier plane is fly...

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Abstract

The invention discloses a non-adaptive airborne non-side-looking radar short-range clutter suppression method. A non-adaptive short-range clutter suppression method formed by space-time filtering and space-time matching is used for suppressing airborne radar short-range clutter. The method comprises the steps of firstly arranging received signals of all channels of radar into a column vector, then performing space-time filtering to the received signals to suppress clutter energy, and finally performing space-time two-dimensional matching to realize the detection of a target. The non-adaptive airborne non-side-looking radar short-range clutter suppression method overcomes the defects that a great number of training samples which satisfy independent and identical distribution conditions are needed when the traditional adaptive clutter suppression method is applied to airborne radar, the calculation amount is great and the performance during short-range clutter suppression is seriously decreased. Compared with the traditional adaptive clutter suppression method, the method provided by the invention has the advantages that since the method is a non-adaptive method, the method is not influenced by non-uniform samples, the calculation complexity is low, the clutter suppression can be conveniently and quickly realized and the detection of the target is more greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a non-adaptive short-range clutter suppression method composed of space-time filtering and space-time matching for airborne non-side-looking radars (Short-range Clutter Suppression Approach, SCSA), to suppress the short-range clutter of the non-front-looking radar and realize the detection of the target. Background technique [0002] After the Second World War, modern radar technology has experienced more than 80 years of vigorous development, and some major technological breakthroughs have made the performance of radar more perfect. Because the traditional ground-based radar is placed statically, the clutter echo does not have space-time coupling characteristics, so the ground clutter is mainly distributed near the center zero frequency. The widely used moving target indication (MTI) technology and moving target detection (MTD) Technology can realize the detecti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/292
Inventor 冯大政赵海霞曹杨朱国辉解虎袁明冬
Owner XIDIAN UNIV
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