Waveform design method of two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning

Abstract

The invention provides a waveform design method of a two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning. The method comprises the following implementation steps: setting parameters of a synthetic aperture imaging radar SAR; calculating a transmitted waveform of the antenna array; calculating a time-space directional diagram of the transmitted waveform; calculating an instantaneous beam directional angle of the time-space directional diagram; drawing a zebra map and dividing the zebra map; calculating a wave beam scanning range of a transmitted waveform in an azimuth frequency scanning mode; calculating azimuth dimension time delay and frequency modulation rate according to the beam scanning range; and obtaining a waveform design result of the two-dimensional scanning high-resolution wide-width SAR of azimuth frequency scanning. According to the invention, the fuzzy suppression can be realized by equivalently replacing DBF spatial filtering with frequency spectrum shift under a single channel, the defect that fuzzy suppression is realized by depending on a multi-channel system and a DBF technology in the prior art is overcome, and engineering realization is facilitated; the surveying and mapping band is divided in a pitching dimension, the width of the surveying and mapping band can be increased, and high-resolution wide-width imaging is achieved through two-dimensional scanning.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a waveform design method for high resolution and wide range SAR, in particular to a waveform design method for two-dimensional scanning high resolution and wide range SAR based on intrapulse azimuth dimension frequency scanning, which can be used for SAR Achieve high-resolution wide-format imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is an active Earth observation system that can be installed on aircraft, satellites and other flight platforms to conduct ground-to-ground observations all-weather and all-weather. In application scenarios such as global dynamic observation, ground object classification and recognition, SAR is required to have the imaging capability to achieve high resolution and wide width. Traditional SAR imaging modes include strip mode, spotlight mode and scan mode. The transmitted signal waveforms used in traditional SAR ...

AI Technical Summary

Problems solved by technology

With the continuous improvement of the requirements for resolution and imaging width, SAR uses multi-dimensional waveform coding signals to achieve high-resolution and wide-width imaging, and the number of channels required will become larger and larger, which is not conducive to engineering realization.

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