Method for designing multiple-input-multiple-output synthetic aperture radar system on basis of sub-band synthesis

Abstract

The invention relates to a method for designing a multiple-input-multiple-output synthetic aperture radar (MIMOSAR) system on the basis of sub-band synthesis. The method includes the steps that a radar waveform generating module generates quadrature encoding signals needed for transmission of various transmitting array elements; according to radar, M transmitting array elements are used for transmitting signals at the same time, and N receiving array elements are used for receiving echo signals simultaneously; each receiving array element receives the echo signals through a main reception channel, extracts a part of the echo signals as required from the echo signals received by the main reception channel through minor reception channels and is provided with the M minor reception channels; signal reconstruction is carried out on the part of the echo signals obtained by the M minor reception channels of each receiving array element; sub-band synthesis is conducted on the reconstructed signals in a distance. The orientation multi-aperture MIMOSAR system based on a sub-pulse linear frequency modulation stepping system namely sub-band synthesis is adopted, the instantaneous operation bandwidth and sampling rate of the MIMOSAR system are reduced manyfold, and remote high-resolution wide-observation-band imaging can be achieved in an SAR mode.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a multi-input multi-output synthetic aperture radar system design method based on subband synthesis. Background technique [0002] With the continuous development of Synthetic Aperture Radar (SAR) system and signal processing technology, achieving high resolution and wide swath at the same time has become the development goal of the new generation SAR system. In order to break through the limitations of the pulse repetition frequency (PRF) on the observation bandwidth and azimuth resolution, Currie et al. proposed the multi-phase center SAR mode. However, MISO SAR adopts a single-send-multiple-receive system in azimuth, and the number of available spatial samples is limited by the number of receiving array elements. Considering the limitations of actual airborne / satellite motion platform size and payload, the number of receiving array elements and array size of ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system that can double the instantaneous operating bandwidth and sampling rate, effectively solve the problem of PRF limitation in the conventional sub-band synthesis SAR system, and realize long-distance high-resolution in SAR mode A multi-input multi-output synthetic aperture radar system design method based on subband synthesis for wide observation band imaging, the method includes the following sequential steps:

Images