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A method for reconstruction of staggered-sar echo signals

A technology of echo signal and transmitting signal, which is applied in the field of radar, and can solve problems such as narrow applicable conditions for multi-channel reconstruction, unsatisfactory two-point linear interpolation results, and large amount of optimal linear interpolation calculations.

Inactive Publication Date: 2018-09-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in the reconstruction process of radar echoes, these methods have the disadvantages of unsatisfactory two-point linear interpolation results, narrow application conditions for multi-channel reconstruction, and large amount of optimal linear interpolation calculations. Therefore, a new reconstruction method is proposed very important

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  • A method for reconstruction of staggered-sar echo signals
  • A method for reconstruction of staggered-sar echo signals
  • A method for reconstruction of staggered-sar echo signals

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[0034] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0035] In order to describe content of the present invention conveniently, at first do following term definition:

[0036] Definition 1. Lagrange interpolation

[0037] It is known that a function f(t) in its domain [p 0 ,p 1 ] There are M+1 different time points t k , k=1,...,M+1, then the M-order interpolation polynomial P of f(t) can be constructed by Lagrangian interpolation M (t) is:

[0038]

[0039] Among them, f(t k ) is the corresponding time is t k When the function value, L k (t) is t k The Lagrangian interpolation basis function of the point can be For details, please refer to the reference: Zhu Chunhui, Research on Conformal Fourier Transform Algorithms. Harbin: Harbin Institute of Technology, 2012, Chapter 3.

[0040] ...

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Abstract

The invention discloses a Staggered-SAR echo signal reconstruction method, and the method employs fonformal Fourier transform to process a radar signal after distance compression. The method gives full consideration to the characteristics of Staggered-SAR echoes, and can obtain a uniform azimuth frequency spectrum suitable for the high-quality imaging of a radar. The frequency spectrum obtained through the method can accurately reflect the frequency spectrum characteristics of azimuth echoes under the conditions of data loss and non-uniform sampling, and finally can be used by a Staggered-SAR system for high-quality imaging. Compared with a conventional method, the method can obtain the uniform azimuth frequency spectrum, is suitable for a classical frequency domain algorithm, and can obtain a high-quality imaging result.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to the imaging technology of High-Resolution Wide-Swath (HRWS) Synthetic Aperture Radar (SAR). Background technique [0002] Staggered-SAR is a new radar mode for high resolution wide swath imaging. Compared with traditional SAR, Staggered-SAR lies in the pulse repetition frequency (Pulse Repetition Frequency, PRF for short). Due to the agile PRF, the Staggered-SAR system can improve the blind area distribution in the radar echo of the traditional SAR system, and can realize the High-resolution wide-swath imaging of targets. Therefore, the Staggered-SAR system can be applied to fields such as all-day and all-weather spaceborne SAR rapid and large-scale map mapping, and plays an important role in the development of the national economy and national security. The Institute for Microwave and Radar Technology of the German Aerospace Agency (DLR) conducted research on Stagge...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/904
Inventor 刘喆邹江波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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