MIMO-SAR imaging method and device based on arc array antenna

Abstract

The invention discloses an MIMO-SAR imaging method and device based on an arc-shaped array antenna. The method includes the steps that echo signals received by the arc-shaped array antenna are sampled, wherein the echo signals are formed by reflecting microwave signals transmitted by the arc-shaped array antenna through an observation scene; according to a sampling angle interval, the received echo signals are sorted, and arc-shaped array imaging data are acquired; distance direction inverse Fourier transformation is conducted on the arc-shaped array imaging data, and then distance compressed signals are acquired; deramping and residual video phase compensation are conducted on the distance compressed signals; distance direction Fourier transformation is conducted on the signals obtained after deramping and residual video phase compensation, and then distance wave number field signals are acquired; filtering and coherence stack imaging processing are conducted on the distance wave number field signals, and then image pixel values are acquired; based on the image pixel values, images are generated. Thus, the microwave imaging region range can be expanded, and effective imaging processing can be conducted on the arc-shaped array antenna signals.

Description

technical field [0001] The present invention relates to the field of microwave imaging, in particular to a MIMO-SAR (Multiple-Input Multiple-Output-Synthetic Aperture Radar) imaging method and device based on an arc array antenna. Background technique [0002] Traditional visual, optical or infrared measures are greatly affected by factors such as terrain, weather and day and night, and do not have the ability to work around the clock. The airborne array antenna forward-looking imaging system can not only penetrate smoke, fog, clouds and floating dust, etc., and is not affected by weather and climate, but also can perform real-time high-resolution imaging of the area in front of and below the aircraft, and can provide information for aircraft landing, Reconnaissance, search and rescue and take-off provide real ground information and enhance the aircraft's navigation and transportation rescue capabilities. [0003] The existing airborne array antenna forward-looking imaging ...

AI Technical Summary

Problems solved by technology

Therefore, it is not conducive to high-resolution imaging observations around airborne platforms

[0004] In addition, since the aperture form of the arc-shaped array MIMO-SAR is arc-shaped, the processing accuracy of BPA (Back Projection Algorithm, BPA for short), which uses the ground plane as the reference platform, is limited, and it is impossible to directly echo the Signal processing for imaging

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