High resolution wide swath imaging method for frequency diversity array synthetic aperture radar

Abstract

The invention discloses a frequency diversity array synthetic aperture radar high resolution and wide swath imaging method. The purpose of the invention aims at overcoming the problem in the prior art of limited wide swath under high resolution imaging method mode. The method comprises the following steps: 1. designing a frequency increment of a frequency diversity array; 2. the frequency diversity array, in accordance with the frequency increment, determining and transmitting a signal set; 3. the frequency diversity array receiving an echo signal, and successively conducting vector quantization output and receiving a wave beam formation, and obtaining a snapshot vector of the echo signal; 4. conducting range ambiguity resolution on the snapshot vector of the echo signal, and obtaining an echo signal without range ambiguity; and 5. imaging the echo signal without no range ambiguity, and obtaining a high resolution and wide width imaging result of the entire scene. According to the invention, the method can effectively resolve echo signals with range ambiguity in spatial frequency domain, and obtains synthetic aperture radar images with high resolution and wide swath through imaging the echo signals that have range ambiguity resolved. The method is applicable to marine observation and global survey.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a synthetic aperture radar (SAR) high-resolution wide surveying band imaging technology, which can be used for ocean observation and global surveying and mapping. Background technique [0002] Synthetic aperture radar SAR has all-weather, all-weather and long-distance ground imaging capabilities, and has a wide range of requirements and applications in terrain mapping, ocean monitoring, environmental and disaster monitoring and reconnaissance, and airborne / spaceborne synthetic aperture radars are gradually being used Extensive research and application in various countries. On the one hand, many practical applications require high-resolution imaging of observation scenarios, such as ocean and land monitoring, map mapping, and disaster assessment; , ocean observation and global surveying and mapping, etc., wide-swath imaging can shorten the revisit time and greatly improve the...

AI Technical Summary

Problems solved by technology

However, the traditional single-channel SAR system cannot achieve wide swath scene imaging in the high-resolution imaging mode, because the high resolution in the azimuth direction means a large Doppler bandwidth. In order to avoid Doppler ambiguity, sufficient A high pulse repetition frequency (PRF) is used for azimuth sampling. However, a wide swath requires a low pulse repetition frequency (PRF) to ensure no range ambiguity in the swath. requirements, this contradiction is particularly prominent in spaceborne radar

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