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Imaging method for remote sensing satellite irradiation source forward-looking synthetic aperture radar

A technology of synthetic aperture radar and remote sensing satellite, applied in the field of radar

Inactive Publication Date: 2012-10-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiency that the existing SAR frequency domain imaging technology cannot be applied to LSA-FBSAR, and provide a frequency domain imaging method suitable for LSA-FBSAR system: a remote sensing satellite illumination source forward-looking synthetic aperture radar frequency This imaging method fully considers the characteristics of the LSA-FBSAR system. It can not only effectively compensate the two-dimensional space-variation characteristics of the echo signal caused by the speed difference of the system's transceiver platform, but also effectively correct the The nonlinear geometric distortion distortion, so this method can efficiently realize LSA-FBSAR high-resolution imaging

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  • Imaging method for remote sensing satellite irradiation source forward-looking synthetic aperture radar
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  • Imaging method for remote sensing satellite irradiation source forward-looking synthetic aperture radar

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Embodiment Construction

[0087] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB 7.6.

[0088] In this embodiment, the TerraSAR-X satellite and the airborne PAMIR are used as the transmitting and receiving platforms respectively. The two platforms fly in parallel and in the same direction. The satellite platform works in the steering spotlight mode, and the aircraft platform works in the forward-looking mode. The antenna beam speeds are respectively 2100m / s and 700m / s. The center frequency of the transmitted signal is 9.65GHz, the bandwidth of the transmitted signal is 60MHz, the pulse repetition frequency is 2500Hz, and the range sampling frequency of the echo signal is 120MHz. Other system platform simulation parameters such as Figure 5 shown. The simulated imaging scene contains nine point targets, and their relative positions are as follows: figure 2 shown, where the reference point target is P ...

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Abstract

The invention provides a frequency domain imaging method for a remote sensing satellite irradiation source forward-looking synthetic aperture radar (LSA-FBSAR). In the method, a nonlinear mapping relationship between range dimension space-variant range cell migration (RCM) and azimuth dimension space-variant RCM is acquired from the complex coupling relationship of a two-dimensional frequency spectrum by the resolution representation of the frequency spectrum of an LSA-FBSAR system and the characteristic of forward-looking work of a receiving platform. The conventional two-dimensional space-variant RCM compensation processing procedure is improved; the compensation of the target azimuth of a non-reference point and slant-range two-dimensional space-variant RCM is realized by scaled Fourier transform-phase multiplication technology and interpolation-phase multiplication technology; the problem of severe geometric distortion such as bending, distortion and the like of an imaging result caused by two-dimensional nonlinear space-variant RCM is effectively solved; and the method is suitable for realizing the high-resolution imaging of the LSA-FBSAR.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to the imaging technology of forward-looking synthetic aperture radar (abbreviation: LSA-FBSAR) of remote sensing satellite illumination source. Background technique [0002] The transmitter and receiver of remote sensing satellite illumination source forward-looking synthetic aperture radar (LSA-FBSAR) system are placed separately on the low-orbit remote sensing satellite and the aircraft platform. The wideband signal is transmitted to the area, and the receiver acquires the scattered echo of the target and performs synthetic aperture processing, finally realizing high-resolution two-dimensional imaging directly in front of the receiver. [0003] The LSA-FBSAR system has abundant space and motion resources due to the separation of the receiving and transmitting platforms. It can remove the remote sensing field of view limitation of the traditional single-base SAR due to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00G01S13/90G01S7/40
Inventor 刘喆张晓玲杨建宇叶伟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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