Multi-input multi-output synthetic aperture radar imaging method

Abstract

A multi-input multi-output synthetic aperture radar imaging method comprises the steps that parameters are set; according to the number of azimuth transmitting antennas, a corresponding quantity of orthogonal multidimensional waveform coding signals are determined; according to the number of distance sub-bands, a transmitting waveform of distance array elements is determined; the signals are transmitted to a to-be-imaged scene; after the signals are reflected by a to-be-imaged object, a receiving module receives the signals and forwards the signals to a processing system for sampling; based onthe sampled signals, reflected echoes of the multiple distance sub-bands are separated through space domain filtering; the reflected echoes of the multiple distance sub-bands are further separated through frequency domain filtering, and the isolation degree among the distance sub-band signals is increased; the separated reflected echoes of the distance sub-bands are demodulated, so that a received echo corresponding to each azimuth transmitting antenna is obtained; and the received echoes are imaged through the multi-input multi-output synthetic aperture radar imaging method.

Description

technical field [0001] The present invention relates to the technical field of electronic information technology radar, in particular to a multi-input multi-output Synthetic Aperture Radar (MIMO-SAR) imaging method based on multi-dimensional waveform coded signals and full digital beamforming. Background technique [0002] Synthetic Aperture Radar (SAR), as an all-weather, all-time, high-resolution active microwave imaging radar, has the incomparable advantages of visible light and infrared detection systems. It has been widely used in surveying and mapping, marine research, resource exploration and many other fields. The basic principle is to use the relative motion between the small-aperture antenna in azimuth and the target to virtually synthesize a large antenna, so as to obtain higher azimuth resolution. [0003] For the traditional synthetic aperture radar, the area of ​​the antenna needs to be reduced in order to increase the surveying width, and the reduction of the...

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Problems solved by technology

[0006] The present invention proposes a multi-transmit and multi-receive synthetic aperture radar imaging method to at least partly solve the problems of small surveying and mapping width caused by small antenna area, low gain, imaging capability, and the coding method used in traditional MIMO-SAR in the existing method OFDM-chirp, the problem that OFDM-chirp cannot really achieve high-resolution wide-area mapping

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