A SAR radar echo acquisition method based on graphics processing unit

Abstract

The invention discloses an SAR echo acquisition method based on a graphics processing unit. The main idea of invention comprises the steps of determining carrier aircraft flight speed of an SAR, synthetic aperture azimuth time of the SAR, carrier aircraft flight direction of the SAR and P point targets in an SAR beam irradiating scanning range; then classifying the P point targets into K concentric circles; selecting an energy amplitude value of the i-th point target in the k-th concentric circle for multiple interpolation operation; sequentially calculating an echo expression of the i-th point target in the k-th concentric circle and an SAR pulse pressure echo corresponding to the k-th concentric circle at the azimuth time t; finally carrying out matched filtering reverse processing after calculating an SAR pulse pressure echo Et corresponding to the K concentric circles at the azimuth time t; calculating an original echo signal before the pulse compression at the azimuth time t; and thus calculating a corresponding SAR original echo signal in the synthetic aperture azimuth time of the SAR.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a SAR radar echo acquisition method based on a graphic processing unit, which is suitable for the simulation real-time processing of the SAR echo in a large scene. Background technique [0002] Synthetic Aperture Radar (SAR) can observe targets or scenes all-weather and all-weather, and has huge application space in disaster monitoring, resource exploration, especially in military and civilian fields. With the development of Synthetic Aperture Radar (SAR) technology, more and more high-resolution new Synthetic Aperture Radars (SARs) have been developed. The received echo signals are accurately simulated, and then the new SAR is evaluated and verified; among them, the echo signals received by the new SAR include point targets and distributed scene targets. For the accurate simulation of point targets, the traditional SAR echo signal simulation method i...

AI Technical Summary

Problems solved by technology

In order to further improve the calculation efficiency, relevant researchers combined the concentric circle algorithm and the graphics processing unit architecture to carry out SAR echo simulation. However, the concentric circle algorithm used in this method is not accurate enough, which will lead to image quality deterioration; moreover, this method does not The design of the graphics processing unit architecture is further optimized, but the efficiency is still low. Compared with the conventional time-domain echo simulation algorithm, the acceleration ratio of the scene target simulation is very low, which cannot meet the real-time processing requirements.

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