GPU-based spaceborne SAR real-time echo simulator

Abstract

The invention discloses a GPU-based spaceborne SAR real-time echo simulator. A GPU is adopted as a core component for SAR echo calculation; the GPU-based spaceborne SAR real-time echo simulator comprises a radio frequency transceiver subsystem, an intermediate frequency modulation subsystem and an echo calculation subsystem; and the method comprises the steps of carrying out down-conversion to obtain an intermediate frequency transmission signal according to a local oscillator signal and an SAR load radio frequency transmission signal; transmitting the intermediate frequency transmission signal to an intermediate frequency modulation subsystem; collecting the intermediate frequency transmission signal transmitted from a radio frequency transceiver subsystem under the control of a timing pulse signal and then carrying out digital down-conversion processing to obtain a baseband transmission signal; generating a scene response function by an echo calculation system in real time accordingto externally transmitted satellite operating mode and orbit information; and carrying out real-time convolution on the received baseband transmission signal and the scene response function to obtaina baseband echo signal, carrying out up-conversion through the intermediate frequency modulation subsystem and the radio frequency transceiver subsystem and then obtaining a radio frequency echo signal. The GPU-based spaceborne SAR real-time echo simulator has the advantages of high calculation accuracy, high reliability, better extendibility and the like.

Description

technical field [0001] The invention relates to a GPU-based spaceborne SAR real-time echo simulator, which belongs to the technical field of SAR echo mode. Background technique [0002] Traditional spaceborne SAR echo simulators are mostly realized by equipment based on board card chassis, in which the chip is used as the core computing device to generate SAR real-time echo signals. The traditional spaceborne SAR echo simulator has the disadvantages of complex programming, low calculation accuracy, long period of function expansion and improvement, and high cost. Contents of the invention [0003] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to provide a real-time echo simulator for spaceborne SAR based on GPU, which can reduce the development difficulty of the real-time echo simulator, improve the calculation accuracy of echo signal generation, and improve the The adaptability of spaceborne SAR echo simulation f...

AI Technical Summary

Problems solved by technology

The traditional spaceborne SAR echo simulator has the disadvantages of complex programming, low calculation accuracy, long cycle of function expansion and improvement, and high cost.

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