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Weighted adaptive detector for flexible control of mismatched subspace signals

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

Active Publication Date: 2019-03-01
AIR FORCE EARLY WARNING ACADEMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Weighted adaptive detector for flexible control of mismatched subspace signals
  • Weighted adaptive detector for flexible control of mismatched subspace signals
  • Weighted adaptive detector for flexible control of mismatched subspace signals

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Embodiment Construction

[0016] In conjunction with the accompanying drawings and embodiments, the present invention will be further elaborated below. Assuming that the number of channels of the phased array radar is 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 with dimension p, the subspace signal s can be expressed as s=Aθ, where the N×p-dimensional full-rank matrix A represents the basis of the signal subspace matrix, p-by-1 dimensional column vector θ representing the unknown magnitude of the signal. Therefore, the data x to be detected 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 needed for this. Assuming that there are L training samples, the lth training sample (l=1, 2, ..., L...

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Abstract

The invention discloses a weighted adaptive detector for flexible control of mismatched subspace signals. With to-be-detected data and a training sample, a subspace adaptive matching filter (SAMF) detector with the robust characteristic for signal mismatching is formed; with the to-be-detected data and the training sample, a whitening subspace orthogonal suppression (W-SABORT) detector having themismatch sensitive characteristic for signal mismatching is formed; a weighted detector is constructed by using the SAMF detector and the W-SABORT detector; and then a detection threshold is calculated based on statistical characteristics of the weighted detector and a system' preset false alarm probability and threshold comparison is carried out to determine whether a target exits. According to the detector, the weighting coefficient is adjusted based on the system's need to realize robust detection or suppression of the mismatched subspace signal. The designed weighted detector has the constant false alarm (CFAR) characteristic and no additional CFAR is needed. The clutter suppression function is realized without the need to take the clutter suppression as an independent processing stepaccording to the designed weighted detector.

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. The beam scanning can be realized by controlling the phase of each transmitting array element and receiving array element, which overcomes the problem that mechanical radar can only realize beam scanning by mechanical rotation. Congenitally deficient. Phased array radar uses many independent array elements to transmit and receive data, and can obtain multiple airspace channel information. Based on this, the combat effectiveness of the radar system can be greatly improved through subsequent array signal processing technology. [0003] For ...

Claims

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Application Information

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Patent Type & Authority Applications(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