Dual-polarization SAR image system

Abstract

The present invention discloses a dual-polarized SAR image system which is low in target detection false alarm rate and high in detection rate. According to the technical scheme, a receiving and transmitting conversion module receives horizontal polarization signals of an H transmitting antenna and vertical polarization signals of a V polarization receiving antenna at the same time, the polarization form of the transmitting signals is changed, and a data acquisition board carries out digital down-conversion on acquired frequency mixing signal data and converts the frequency mixing signal datato a baseband; the H-channel pulse pressure module and the V-channel pulse pressure module are connected with a reference function module in parallel, the reference function module carries out Dopplerfrequency modulation, Doppler center estimation, distance bending correction, walking correction, parameter estimation and orientation matching filtering on data, and after a dual-polarization SAR image is obtained, determination fusion processing is carried out on the target to obtain a target detection result, and matrix singular value SVD decomposition is carried out on the covariance matrix corresponding to each pixel so as to obtain a characteristic value of the covariance matrix and a polarization entropy value of each SAR image pixel.

Description

technical field [0001] The invention relates to a SAR image polarization entropy system for reducing the false alarm rate of target detection. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave remote sensing imaging sensor that works in the microwave band and records the echo amplitude information and phase information of ground objects. Earth observation capability, and has a certain penetrating ability, which can reflect the characteristics of ground structure information. And by adjusting the viewing angle, it has a better ability to distinguish the spatial position and morphological characteristics of the target. This unique advantage makes SAR play a huge role in land use survey, resource exploration, geological survey, topographic mapping and so on. Compared with traditional means of information acquisition, SAR imaging systems can not only acquire high-resolution images, but also are not affected by environmental factors such as day...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the prior art, to provide a dual-polarization SAR image system with a low false alarm rate for target detection and a high detection rate, so as to solve the problem that the false alarm rate of the conventional target constant false alarm detection method is too high. high problem

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