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A Weighted Adaptive Detector with Flexible Control for Mismatched Subspace Signals

A detector, adaptive technology, applied in the field of multi-channel active phased array radar

Active Publication Date: 2022-07-12
AIR FORCE EARLY WARNING ACADEMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the difficult problem of subspace signal detection in the presence of signal mismatch

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  • A Weighted Adaptive Detector with Flexible Control for Mismatched Subspace Signals
  • A Weighted Adaptive Detector with Flexible Control for Mismatched Subspace Signals
  • A Weighted Adaptive Detector with Flexible Control for Mismatched Subspace Signals

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Embodiment Construction

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Let the number of channels of the phased array radar be N, the data to be detected can be represented by an N×1-dimensional vector x. When there is a subspace signal s in the data to be detected, and the signal is located in a subspace of dimension p, the subspace signal s can be expressed as s=Aθ, where the N×p-dimensional column full-rank matrix A represents the basis of the signal subspace Matrix with a p×1 dimensional column vector θ representing the unknown amplitude of the signal. Therefore, the data to be detected x can be written as

[0017] x=Aθ+n (1)

[0018] Among them, the N×1-dimensional column vector n is the sum of thermal noise and clutter components. In practice, the statistical properties of n are unknown, and training samples are used for this. Assuming that there are L training samples, the lth training sample (l=1, 2, ..., L) is den...

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Abstract

The invention discloses a weighted adaptive detector for flexible control of mismatched subspace signals. The invention firstly utilizes the data to be detected and training samples to form a subspace adaptive matched filter (SAMF) detector with robust characteristics to signal mismatch; Whitening Subspace Quadrature Suppression (W-SABORT) detector; then use SAMF detector and W-SABORT detector to construct a weighted detector; finally, according to the statistical characteristics of the weighted detector and the false alarm probability preset by the system, the detection threshold is calculated and the detection threshold is calculated. A threshold comparison is performed to determine whether the target exists. The detector designed by the present invention can adjust the size of the weighting coefficient according to the needs of the system, so as to realize robust detection or suppression of mismatched subspace signals; the weighted detector designed by the present invention has the characteristic of constant false alarm (CFAR), and no additional CFAR is required. Processing steps; the weighted detector designed by the present invention can realize the function of clutter suppression without taking clutter suppression as an independent processing step.

Description

technical field [0001] The invention relates to self-adaptive detection under subspace signal mismatch, and is especially suitable for multi-channel active phased array radar. Background technique [0002] No matter how radar technology develops, target detection is always one of the most basic and important functions of radar. The phased array radar antenna is composed of multiple transmitting array elements and receiving array elements. By controlling the phase of each transmitting array element and receiving array element, beam scanning can be realized, which overcomes the problem that mechanical radar can only achieve beam scanning by mechanical rotation. Congenital insufficiency. The phased array radar uses many independent array elements to transmit and receive data, and can obtain multiple airspace channel information. According to this, the combat effectiveness of the radar system can be greatly improved through the subsequent array signal processing technology. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/04G01S7/41
CPCG01S7/414G01S13/04
Inventor 刘维建段克清王永良陈辉杜庆磊
Owner AIR FORCE EARLY WARNING ACADEMY