SAR radar moving target detecting and imaging method based on FM continuous wave

Abstract

The invention discloses an SAR radar moving target detecting and imaging method based on an FM continuous wave. The method comprises the steps of establishing a geometric model of an SAR radar based on the FM continuous wave for detecting N moving targets, wherein the SAR radar based on the FM continuous wave comprises B channels, a first channel is a reference channel and N moving targets transmit the FM continuous wave signal, respectively receiving echo signals of the N moving targets by the B channels; after obtaining the echo signals of the N moving targets which are respectively received by the B channels, respectively performing imaging processing, and respectively obtaining images which correspond with the B channels; further successively performing clutter cancellation processing, moving target detecting and orientation dimension reversal conversion, and obtaining distance time domain-orientation time domain echo signals of the N moving targets; performing distance dimension FFT, obtaining original echo signals of the N moving targets after distance dimension fast Fourier transform; further calculating corresponding images of N real moving targets, and respectively calculating respective real moving speeds of the N real moving targets according to an along-track interferometry method.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a SAR radar moving target detection and imaging method based on a frequency modulated continuous wave, namely a SAR radar moving target detection and imaging method based on a frequency modulated continuous wave (FMCW), It is suitable for fast detection and imaging of moving targets under the condition of high duty cycle and low power of frequency-modulated continuous wave FMCW signal. Background technique [0002] Synthetic Aperture Radar (SAR) has a wide range of uses and can work all day and all day without considering the influence of light and weather. It plays an important role in target imaging; SAR radar imaging technology can complete the imaging of ground stationary scenes and obtain Electromagnetic scattering signatures and high-resolution 2D images of stationary objects. However, when there is a moving target in the ground scene, SAR radar...

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Problems solved by technology

[0004] At present, the problems and challenges faced by SAR-GMTI include the following problems: in the SAR radar imaging results, the moving target is usually seriously defocused, the signal-to-noise ratio is low, and it is difficult to detect, and how to quickly complete the detection and imaging of the moving target, especially in the Fast moving target detection and imaging under the FMCW-SAR system;

[0006] The methods discussed above are mainly aimed at fast imaging of strip SAR radar targets, fast detection of FMCW-SAR radar targets, and slow target imaging of FMCW-SAR radar. In the case of blur, the moving target will appear ghost or defocused after imaging, resulting in a decrease in the signal-to-noise ratio of the moving target, and the moving target is not easy to be detected

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