Space-borne SAR echo simulation device and simulation method

Abstract

The invention provides a space-borne SAR echo simulation device and simulation method. The space-borne SAR echo simulation device comprises an external interface module, a GPU echo calculation module,an echo data storage module and a simulation parameter calculation module. The external interface module receives input of a baseband transmission signal, a synchronous reference clock and PRF pulse;the simulation parameter calculation module simulates a target scene irradiated by a satellite antenna beam at the current pulse moment according to a satellite moment input by the external interfacemodule and satellite SAR simulation parameter information set by a user; the GPU echo calculation module calculates impulse response sequence of the target scene according to the information of the target scene and inputs the impulse response sequence to the external interface module; and the external interface module carries out convolution computation on the impulse response sequence of the target scene and the baseband transmission signal to obtain a baseband echo signal, saves the baseband echo signal in the echo data storage module and then, outputs the baseband echo signal. According tothe technical scheme, echo generation efficiency can be improved effectively.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular, to a simulation device of space-borne SAR echo and a simulation method of space-borne SAR echo. Background technique [0002] Spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) operates in orbital space and is not restricted by harsh weather conditions, national borders, etc., and has the advantages of all-day, all-weather work and large-scale imaging. For the research of spaceborne SAR technology, the echo signal received by the radar plays a key role—the radar echo signal includes the influence of satellite attitude, satellite-ground space geometry, radar system parameters, atmospheric environment, etc., and can affect the spaceborne SAR system parameters, Imaging algorithms, performance indicators, etc. are detected, and echo signals are simulated by computer, which is not only flexible and efficient, but also relatively low in cost, so it is wide...

AI Technical Summary

Problems solved by technology

[0003]Spaceborne SAR echo simulation has high precision, low real-time requirements and a huge amount of calculation. Due to the refinement of imaging scene processing, the original echo data The amount of simulation calculations has increased massively, and the simulation on the PC side takes a long time and the simulation efficiency is low. It is difficult to meet the high-speed real-time requirements of 100 billion floating-point operations per second and 100 billion bytes of data processing in engineering research. CPU is used in related technologies , DSP, FPGA and other hardware platforms have their own deficiencies in processing, and the echo generation efficiency is low. There is no effective solution for this at present.

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