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An Extended Target Detection Method for Signal Mismatch in Clutter Environment

A technology for expanding targets and detection methods, applied in radio wave measurement systems, radio wave reflection/re-radiation, measurement devices, etc., to achieve the effect of simple structure and improved detection performance

Active Publication Date: 2022-04-05
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of extended target detection when there is a signal mismatch in the clutter environment, and to design a detection method with flexible control characteristics for the mismatch signal

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  • An Extended Target Detection Method for Signal Mismatch in Clutter Environment

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Embodiment Construction

[0021] Preferred embodiments of the invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the invention, and are not intended to limit the protection scope of the invention.

[0022] see figure 1 As shown, an extended target detection method for signal mismatch in a clutter environment includes the following steps: use the sampling covariance matrix to perform quasi-whitening on the signal matrix and the data to be detected; determine the initial value of the adjustable parameter; Spatial dimension and target expansion dimension size, use the quasi-whitened signal matrix and quasi-whitened data to be detected to construct detection statistics; compare the detection statistics with the detection threshold: if the detection statistic is greater than the detection threshold, the target is judged exists; otherwise, the judgment target does no...

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Abstract

The invention provides an extended target detection method for signal mismatch in a clutter environment. Subspace dimension and target expansion dimension size, use the quasi-whitened signal matrix and quasi-whitened data to be detected to construct detection statistics; compare the detection statistics with the detection threshold: if the detection statistic is greater than the detection threshold, the judgment The target exists; otherwise, it is judged that the target does not exist. The invention has flexible mismatch signal detection capability, can realize the suppression of the mismatch signal, and can also realize the robust detection of the mismatch signal; at the same time, it has the constant false alarm characteristic and does not need additional constant false alarm processing steps.

Description

technical field [0001] The invention relates to an extended target detection method when signals are mismatched in a clutter environment, and is especially suitable for multi-channel active phased array radars. Background technique [0002] Target detection is one of the most basic and main functions of radar. With the improvement of radar performance, the resolution of radar continues to increase, and the target often shows an expansion characteristic in the distance dimension, especially for large targets, such as strategic bombers or large sea ships. In addition, due to the existence of array element errors and interference signals, there is often a signal mismatch phenomenon in practice, that is, the system assumed value is inconsistent with the real value. [0003] Depending on the cause of the signal mismatch, the required object detection is also different. If the signal mismatch is caused by element errors, a detection method with robust performance is required. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/04
CPCG01S13/04
Inventor 刘维建王永良杜庆磊陈辉戴凌燕
Owner AIR FORCE EARLY WARNING ACADEMY
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