Phase compensation method for baseline oscillation of interference SAR (synthetic aperture radar) based on back-projection algorithm

A back-projection and baseline technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve problems such as interferogram quality degradation, auxiliary image imaging quality degradation, and elevation inversion baseline selection.

Inactive Publication Date: 2013-01-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] In order to solve the problems such as the decrease of auxiliary image imaging quality, the decrease of interferogram quality, and the selection of elevation inversion baseline in the interferometric synthetic aperture radar imaging processing under the moving baseline (baseline jitter), the invention provides a moving baseline interferometry based on the back projection algorithm. Synthetic aperture radar phase compensation method, adopting the method of the present invention can obtain higher measurement accuracy than the traditional imaging method

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  • Phase compensation method for baseline oscillation of interference SAR (synthetic aperture radar) based on back-projection algorithm
  • Phase compensation method for baseline oscillation of interference SAR (synthetic aperture radar) based on back-projection algorithm
  • Phase compensation method for baseline oscillation of interference SAR (synthetic aperture radar) based on back-projection algorithm

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[0095] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on VC++ and MATLAB7.0. The specific implementation steps are as follows:

[0096] Step 1. Initialize the parameters of the moving baseline interferometric synthetic aperture radar imaging system:

[0097] The initial imaging system parameters include: platform velocity vector [0 150 0], velocity unit is m / s, initial position vector of platform main and auxiliary antenna [0 0 6000], [10 0 6000], scene center position vector [8000 0 0 ], the unit is m, and the roll, yaw and pitch shake angles at each azimuth moment within a synthetic aperture time are The unit is degrees, the radar carrier frequency is 10GHz, the baseline length is 10m, the signal bandwidth of the baseband signal transmitted by the radar is 150MHz, the pulse width of the radar transmitted signal is 1us, the sampling frequency of the radar receiving system is 300M...

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Abstract

The invention discloses a phase compensation method for baseline oscillation of an interference SAR (synthetic aperture radar) based on back-projection algorithm. Due to the fact that a baseline changes along with motion of a platform, errors exist in Doppler phase compensation and coherent accumulation of an auxiliary antenna, which causes defocusing of SAR images of the auxiliary antenna. By multiplying a compensating factor to each direction in a synthetic aperture, the effect of a static baseline is achieved, the images are well focused during coherent accumulation, and interference phase images are equivalent to the interference phase images under a static baseline. Better measuring precision than traditional imaging methods is achieved by the method.

Description

technical field [0001] The technical invention belongs to the field of radar technology, and in particular relates to the field of synthetic aperture radar (SAR) imaging technology. Background technique [0002] Interferometric synthetic aperture radar (InSAR) is an important remote sensing technology that can realize high-resolution and high-precision three-dimensional mapping of the ground. It is one of the fastest-growing and most effective sensors among microwave sensors. Interferometric synthetic aperture radar has an extremely wide range of applications in military affairs, national economic construction and scientific research. [0003] Interferometric SAR is an interferometric technique developed on the basis of SAR. It obtains the ground elevation map (DEM) by interfering with the echo data obtained from the observation of multiple receiving antennas. Interferometric SAR has two working modes: repetitive orbit interferometry and dual-antenna interferometry. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 张晓玲郝伟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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