Spaceborne SAR echo correction and pulse compression method based on reference signals

Abstract

The invention discloses a spaceborne SAR echo correction and pulse compression method based on reference signals. The method includes noise and interference suppression of the reference signals and echo signals, amplitude correction and phase compensation factor acquisition from the reference signals, and echo signals amplitude correction and phase compensation. By means of spaceborne SAR echo correction and compensation on the basis of the reference signals, influence on the subsequent imaging processing step and image focusing effect due to signal distortion errors caused by system nonideal phase amplitude characteristics can be reduced, and the harsh phase amplitude characteristic index parameter requirements on a signal source and other single machines by a high-resolution spaceborne SAR system can be alleviated to the certain extent; the compensation and correction method is simple and easy to implement, and the computing efficiency is improved greatly.

Description

technical field [0001] The invention relates to a spaceborne SAR echo correction and pulse compression method based on a reference signal, and belongs to the technical field of pulse radar design. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR), as an important observation method for high-resolution microwave remote sensing of the Earth, has received more and more attention in recent years. SAR has all-day and all-weather working capabilities, and can obtain high-resolution images of targets in multi-band and multi-polarization modes, so it is widely used in terrain mapping, ocean monitoring, disaster reduction and prevention, agriculture, forestry, and military reconnaissance. play an important role. [0003] Generally, SAR obtains high range resolution by transmitting large bandwidth signals. When the instantaneous bandwidth of the system is large, the non-ideal characteristics of the entire link of the system will cause significant distortion in ...

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Problems solved by technology

The method in this paper can improve the quality of subsequent image processing very well, but it does not involve the influence of interference noise contained in the reference signal itself on amplitude correction, phase compensation and pulse compression. When the reference signal itself has a large error, it reduces The performance of amplitude correction, phase compensation, and pulse compression in subsequent imaging processing affects the quality of image focusing; the paper does not involve the joint calculation method of amplitude and phase correction factors, nor does it consider the impact of subsequent imaging processing algorithms on the calculated amplitude and phase The influence of the correction factor increases the computational load of the entire imaging processing algorithm

[0008] According to the existing public information query, there is currently no relevant method that considers the influence of the non-ideal error factors of the reference signal itself on the compensation and correction effect when using the SAR echo correction and pulse compression of the reference signal

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