Equivalent wavelength-based bistatic SAR (synthetic aperture radar) two-dimensional spectrum estimation method

Abstract

The invention discloses an equivalent wavelength-based bistatic SAR (synthetic aperture radar) two-dimensional spectrum estimation method. The invention mainly aims to solve the problem of low accuracy of the estimation of the two-dimensional spectrum of a bistatic synthetic aperture radar in the prior art. The implementation process of the method of the invention includes the following steps that: (1) the echo data of the bistatic SAR are received; (2) the azimuth transmitting frequency of the echo data of the bistatic SAR is calculated; (3) the azimuth receiving frequency of the echo data ofthe bistatic SAR is calculated; (4) the equivalent wavelength of the bistatic SAR along the direction of the center of beams is calculated; and (5) the estimated value of the two-dimensional spectrumof the echo data of the bistatic SAR is calculated. With the method of the invention adopted, the accuracy of the estimation of the two-dimensional spectrum of the bistatic synthetic aperture radar can be improved. The method can be used for the imaging and verification of the echo data of the bistatic SAR.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a two-dimensional spectrum estimation method of a bistatic synthetic aperture radar SAR (Synthetic Aperture Radar) based on an equivalent wavelength in the technical field of radar imaging. The invention can use the bistatic synthetic aperture radar SAR two-dimensional spectrum to image and verify the bistatic synthetic aperture radar SAR data. Background technique [0002] The receiver and transmitter of bistatic synthetic aperture radar SAR are loaded on different airborne platforms, and the working mode of "long-distance transmission and short-distance reception" is adopted, which improves the radar's working distance and improves the flexibility of data acquisition , expanding the application field of synthetic aperture radar SAR. Under war conditions, the bistatic SAR transmitter can work in a relatively safe area far away from the combat zone, while the receiver does n...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that in the process of calculating the two-dimensional spectrum through the two-dimensional Fourier transform, the method uses the principle of stationary phase point to solve, which is an approximate solution and affects the accuracy of the two-dimensional spectrum;

The disadvantage of this method is that the equivalent wavelength obtained by this method is obtained along the distance direction, and the expression of the final two-dimensional spectrum will be different from the real expression, which is not suitable for radars working in the squint mode system

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