UHF waveband multi-channel radar radial speed detection method based on tensor product

Abstract

The invention discloses a UHF waveband multi-channel radar radial speed detection method based on a tensor product. The problems that in the prior art, the low-speed moving target detection probability and radial speed estimation precision are low under the condition that an antenna bearing aperture is limited are mainly solved. According to the implementation process, the method comprises the steps that a tensor product operation is carried out on data vectors received by a radar to obtain data with a virtual aperture expanded; a tensor product operation is respectively carried out on search clutter guide vectors and search target guide vectors to obtain search clutter guide vectors and target guide vectors with the virtual aperture expanded; the search clutter guide vectors and target guide vectors with the virtual aperture expanded are tensioned into search signal subspace; the radial speed of a target is estimated through signal subspace fitting. The method has the advantages of being high in low-speed object detection probability and radial speed estimation precision, and is used for estimating the low target radial speed under the condition that the antenna bearing aperture is limited.

Description

technical field [0001] The invention belongs to the technical field of radar detection, and relates to the detection of slow targets and the estimation of radial velocity, in particular to a UHF band multi-channel radar slow expansion target detection method which adopts signal subspace fitting and is based on tensor product , which is used to detect slow targets with high detection probability and estimate target radial velocity with high precision under the condition of limited antenna aperture. Background technique [0002] UHF band airborne multi-channel SAR-GMTI radar comprehensively utilizes synthetic aperture radar (SAR) technology and ground moving target detection (GMTI) technology, which can simultaneously obtain high-resolution static information and real-time dynamic information of the surveillance area; Therefore, UHF airborne multi-channel SAR-GMTI radar has important application value in both civilian and military applications. [0003] For the detection of m...

AI Technical Summary

Problems solved by technology

However, the airborne radar in the UHF band is much smaller than the ratio of the antenna azimuth aperture to the wavelength of the X-band, and the space-time adaptive processing technology is used to suppress the clutter and also cancel all or part of the slow target signal at the same time, resulting in The detection ability of moving targets in the main lobe clutter area will decrease; at the same time, in order to obtain higher azimuth resolution, the synthetic aperture time of airborne UHF band radar is much longer than that of X-band radar. The target defocus will be more serious. At this time, the traditional adaptive matched filter method (AMF) based on point target assumption will fail, which is an inherent defect of UHF band radar in detecting ground moving targets.

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