A Simulation Method of Synthetic Aperture Radar Echo Signals under Non-straight Track Conditions

Abstract

The invention provides a method for simulating a synthetic aperture radar echo signal under a nonlinear track condition. The method includes the steps of 1. setting a set of linear tracks at equal intervals; 2. for each linear track, using an SAR echo signal simulator under a linear track assuming condition to calculate an SAR echo signal; 3. performing Fourier transform on the echo signal of each SAR transmission pulse on each linear track; 4. on each frequency component k, performing interpolation filtering on the SAR echo signal between different linear tracks; and 5. performing inverse Fourier transform on the echo signal of each SAR transmission pulse. The simulation method provided by the invention can realize function upgrading of the SAR echo signal simulator under an ideal linear track condition without any modification of internal codes; limiting conditions for radar parameters are few, and wide applicability is achieved; the calculation efficiency is high; and the simulation method can serve as a unified framework to be used for echo signal simulation of various SAR imaging modes under the non-linear track condition.

Description

【Technical field】 [0001] The invention belongs to the field of synthetic aperture radar and signal processing, and specifically relates to a simulation technology of synthetic aperture radar echo signals, in particular to a simulation method of synthetic aperture radar echo signals under non-linear track conditions. 【Background technique】 [0002] Synthetic Aperture Radar (SAR) echo signal simulator plays an important role in researching SAR imaging algorithm and verifying SAR system scheme. Under the assumption of an ideal straight track, there are a variety of efficient SAR echo signal simulation technologies available, such as G. Franceschetti, M. Migliaccio, D. Riccio, and G. Schirinzi, "SARAS: a synthetic aperture radar (SAR)raw signal simulator, "IEEE Transactions on Geoscience and Remote Sensing, vol.30, no.1, pp.110–123, 1992 The frequency domain simulation technique disclosed in, and A.Khwaja, L.Ferro-Famil, and E. Pottier, "Efficient SAR rawdata generation for ani...

AI Technical Summary

Problems solved by technology

However, so far, the efficient SAR echo signal simulation method proposed under the assumption of an ideal straight track cannot be used for non-straight track conditions with yaw

Third, although the calculation efficiency of the SAR echo signal simulator is acceptable under a certain non-straight track condition, the Monte Carlo simulation experiment under multiple different track conditions is still very time-consuming

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