Wideband radar detecting method for correcting correlation matrix based on high resolution target distance image

A technology of target distance and broadband radar, applied in the field of target detection, can solve the problems of ignoring the distance like walking across the distance, it is difficult to obtain the prior knowledge of the target, and it is difficult to obtain the detection performance, so as to improve performance, increase the scope of application, and accurately The effect of detection judgment

Inactive Publication Date: 2009-08-19
XIDIAN UNIV
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Problems solved by technology

In the existing detection technology, some ideal assumptions are often made for the target, but the usual detection technology often ignores the distance walking of the range image, or assumes that the target is moving at a low speed, and requires some prior knowledge about the target
However, for the practical broadband radar detection problem, for high-speed moving flying targets, walking across distances is unavoidable, and it is also difficul

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  • Wideband radar detecting method for correcting correlation matrix based on high resolution target distance image
  • Wideband radar detecting method for correcting correlation matrix based on high resolution target distance image
  • Wideband radar detecting method for correcting correlation matrix based on high resolution target distance image

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Embodiment Construction

[0027] During detection, it is assumed that signals are sent and received continuously through broadband radar, and continuous one-dimensional noisy range images are obtained after matched filtering. distance like x p (m) is a vector with a length of M, and the value of each point represents the amplitude of the distance unit within a certain distance after pulse compression. Here, the length of the range cell corresponds to the length of the radar resolution cell. where H 0 Indicates the situation where there is only clutter and noise but no target, and H 1 Indicates the presence of a signal:

[0028] H 0 : z p ( m ) = ...

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Abstract

The invention provides a method for detecting a broadband radar on the basis of continuous high-resolution target distance image-correction correlation matrix, and the method comprises the following steps: (1) standard deviation estimation is carried out to the noise of distance images that contain noise; (2) based on the standard deviation, a set of non-linear contraction mapping is established, and then the distance images that contain noise are refined according to the contraction mapping, thus obtaining refined multi-pulse distance images; (3) based on the multi-pulse distance images, cross correlation coefficient between every two refined distance images is calculated, thus obtaining a corrected cross correlation coefficient matrix; (4) the cross correlation coefficient matrixes are accumulated to establish the detecting statistic value, and the detecting threshold of current noise variance is set; (5) the detecting statistic value and the detecting threshold are compared to judge whether the target exists. The method has the advantages of cross distance unit detection and multi-pulse accumulation and is used for detecting a non-cooperative target under unknown prior information condition.

Description

technical field [0001] The invention belongs to the technical field of target detection, and in particular relates to a wide-band radar detection method, which is used for target detection under the wide-band radar system. Background technique [0002] Wideband radar (WBR) or ultra-wideband radar (UWB) can resolve a target into many independent scattering points, and the number of resolved scattering points depends on the spread of the target in the radial distance of the radar and the range resolution capability of the radar. It is well known that the range resolution is inversely proportional to the bandwidth of the radar's transmitted waveform. The echoes of wideband radar and ultra-wideband radar contain a large amount of target information, which are usually used in target imaging, recognition and classification. If the target undergoes radial motion or attitude changes during the accumulation process, its high-resolution range profile will vary from pulse to pulse. S...

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Application Information

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IPC IPC(8): G01S13/04
Inventor 水鹏朗许述文刘宏伟
Owner XIDIAN UNIV
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