SAR echo signal simulation method based on quasi-double-station model

Abstract

The invention discloses an SAR echo signal simulation method based on a quasi-double-station model. The SAR echo signal simulation method comprises the following steps: inputting simulation parameters, and carrying out parameter initialization, wherein the simulation parameters include an antenna phase center triaxial coordinate track [X(ti), Y(ti) and Z(ti)] under an earth-fixed coordinate system, a ground target coordinate [xk, yk and zk], a squint angle phi(ti), a look-down angle phi(ti), and a simulation moment tM; calculating a distance vector between an antenna phase center to each ground target at each pulse emission moment, pulse receiving moment and pulse transceiving moment according to the simulation moment; and finally, combining with a mathematic model of an SAR echo signal, so as to obtain corresponding echo data. According to the method, the high-precision SAR echo simulation can be realized based on the quasi-double-station model and a continuous motion model of a radar; the complicated iterative computation is omitted, and very high computation efficiency is realized when the computational accuracy is guaranteed; and the SAR echo signal simulation method is applicable to onboard and satellite-bone SAR echo signal simulation, and the echo simulation of the SAR echo signals under various conditions can be finished.

Description

Technical field [0001] The invention belongs to the field of signal processing, and relates to a simulation parameter calculation method, in particular to a SAR echo receiving time calculation method based on a quasi-dual-station model, which realizes SAR echo signal simulation under the quasi-dual-station model. Background technique [0002] Synthetic Aperture Radar (SAR) has become one of the main themes of the era of rapid development of space information remote sensing technology because it is not affected by weather and climate, and can observe all-time, all-weather, high-resolution, and large-area earth observations. . Because SAR is relatively complex, algorithm verification, performance testing and system debugging are very difficult and complicated, and it needs to meet the SAR raw echo data under specific conditions. It is often not practical to obtain these data through radar carrier flight. The real data acquired by existing SAR satellites cannot be replaced, so SAR ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the error caused by the SAR echo simulation stop-and-go model and the problem of complex parameter calculation algorithms under the non-stop-and-go model, and proposes a method for quickly calculating the receiving time of SAR echo signals based on the quasi-bistatic model , within the allowable range of error, based on the quasi-two-station model to achieve fast simulation, making up for the shortcomings of the stop-and-go model and the non-stop-and-go model

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