Dechirping one-bit acquisition method and system for broadband radar echoes

Abstract

The invention provides a dechirping one-bit acquisition method and system for broadband radar echoes, and the dechirping one-bit acquisition method comprises the steps: carrying out the frequency shift processing of a dechirping echo signal after dechirping pulse pressure processing, and obtaining a frequency shift echo signal; sampling the echo signal of the frequency shift to obtain a signal inwhich a higher harmonic frequency spectrum is separated from a dechirped echo frequency spectrum; carrying out one-bit quantization processing on a signal obtained by separating the higher harmonic frequency spectrum from the de-chirped echo frequency spectrum; obtaining echo data, wherein the frequency offset coefficient of the frequency shift processing and the sampling frequency of the samplingprocessing are determined according to the maximum frequency in the de-skewed echo signal. The frequency band of the de-chirp echo signal and the frequency band of the higher harmonics can be effectively separated, the influence of the higher harmonics on the imaging quality is reduced, the imaging quality of the radar is improved, the data processing amount and the hardware cost are reduced, andthe working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a deskewing one-bit acquisition method and system for broadband radar echo. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather, all-time long-distance and high-resolution detection capabilities, and plays an important role in remote sensing mapping, regional monitoring, geological exploration, disaster relief and other fields. However, with the continuous increase of radar signal bandwidth, the burden of SAR data acquisition, transmission and processing is also increasing. One-bit quantization of the original echo signal can greatly reduce the amount of data in imaging processing and improve work efficiency, but the traditional one-bit sampling quantization will cause the data to continuously jump between 1 and -1, thus introducing the original The high-order harmonics of the signal reduce the imaging quality of the radar. [0003] G. Frances...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method and system for deskewing one-bit acquisition of broadband radar echoes, aiming to solve the problem of poor imaging quality due to high-order harmonics brought about by traditional one-bit quantization

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