A passive radar super-resolution three-dimensional imaging method and system

Abstract

The invention discloses a passive radar super-resolution three-dimensional imaging method and system. The method includes: constructing a three-dimensional rotation imaging model rectangular coordinate system according to obtained positions of a receiver, a rotary table and an outer radiation source; obtaining two kinds of narrowband outer radiation source echo signals of an imaging target by employing the receiver, wherein the two kinds of narrowband outer radiation source echo signals comprise a narrowband outer radiation source echo signal rotating around the Y-axis and a narrowband outer radiation source echo signal rotating around the Y-axis and then around the Z-axis; preprocessing the two kinds of narrowband outer radiation source echo signals to obtain a discrete echo signal matrix; determining a signal matching matrix according to the discrete echo signal matrix; and performing focusing imaging according to the signal matching matrix and the discrete echo signal matrix by employing an orthogonal matching pursuit algorithm. According to the adopted method or system, super-resolution imaging is realized, and the imaging effect has high stability.

Description

technical field [0001] The invention relates to the field of radar three-dimensional imaging, in particular to a passive radar super-resolution three-dimensional imaging method and system. Background technique [0002] Passive radar imaging technology is a hot topic in the field of passive radar research. At present, passive radar imaging technology mainly focuses on two-dimensional imaging. As early as the beginning of this century, the University of Illinois in the United States successfully imaged the target using the civilian external radiation source signal using the Fourier inverse transform technology. On this basis, the frequency domain and time domain algorithms for two-dimensional narrowband passive radar imaging were also proposed. . [0003] At present, 3D imaging is a frontier and hot topic in the field of radar imaging. The current radar 3D imaging technologies mainly include synthetic aperture radar, inverse synthetic aperture radar, terahertz and other tech...

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Problems solved by technology

[0003] At present, 3D imaging is a frontier and hot topic in the field of radar imaging. The current radar 3D imaging technologies mainly include synthetic aperture radar, inverse synthetic aperture radar, terahertz and other technologies. Most of the 3D radar imaging systems composed of the above technologies are active radar systems. In order to obtain high-resolution imaging results, it is necessary to use broadband or ultra-wideband signals, but there is no research on narrowband. In addition, imaging is achieved only by three-dimensional rotation, which has high resolution and unstable imaging effects.

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