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Satellite machine combined double-base synthetic aperture radar frequency domain imaging method

A synthetic aperture radar and bistatic technology, applied in the field of radar, can solve the problems of large amount of computation and high complexity

Inactive Publication Date: 2009-02-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency that the existing SAR frequency domain imaging technology cannot be applied to SA-BSAR, and to provide a frequency domain imaging method suitable for SA-BSAR system: a frequency domain synthetic aperture radar combined with a star-machine The imaging method, which fully considers the system characteristics of SA-BSAR, can not only effectively compensate the two-dimensional space-variant characteristics of the echo signal of the system, but also avoid the problems of large amount of computation and high complexity caused by two-dimensional STOLT interpolation, so This method can efficiently realize SA-BSAR high-resolution imaging

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  • Satellite machine combined double-base synthetic aperture radar frequency domain imaging method

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Embodiment Construction

[0080] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB7.0.

[0081] 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, and work in the steering spotlight and chasing modes respectively. The antenna beam speeds are 2394.8m / s and 853.9m / s respectively. s. The center frequency of the transmitted signal is 9.65GHz, the bandwidth of the transmitted signal is 50MHz, and the pulse repetition frequency is 2000Hz. Other system platform simulation parameters are shown in Table 1. The simulation imaging scene contains five point targets, of which the reference point target is located in the center, and the remaining four point targets are 100 meters away from the reference point target in the slant range and azimuth directions respectively.

[008...

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Abstract

The invention provides a satellite-machine combined frequency domain imaging method of Bistatic Synthetic Aperture Radar (Bistatic SAR), which utilizes characteristics of the SA-BSAR system to obtain the analytical expression of two-dimensional spectrum of the system, and then utilizes Omega-k algorithm thought to obtain SA-BSAR two-dimensional Stolt mapping relation according to the expression of the two-dimensional spectrum; finally, two-dimensional Stolt interpolation can be approximately achieved by using inverse scale Fourier transform and phase multiplication in frequency domain through studying the two-dimensional Stolt mapping relation, so as to complete the compensation for the two-dimensional space variance of the system; the method can avoid the problem of huge calculation and high complexity caused by two-dimensional Stolt interpolation, thereby effectively achieving SA-BSAR imaging with high resolution.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to the imaging technology of a star-machine combined bistatic synthetic aperture radar (abbreviation: SA-BSAR). Background technique [0002] The satellite-aircraft combined bistatic SAR (SA-BSAR for short) system adopts the working mode that the spaceborne platform transmits the signal and the airborne platform receives the target echo signal to realize the imaging of the target area. SA-BSAR not only has good concealment, strong anti-jamming ability and battlefield survivability, but also has the following unique advantages due to its unique "far-sending and near-receiving" working mode: (1) It not only fully utilizes the high , see far, wide coverage and other advantages, and maintain a high image signal-to-noise ratio; (2) reduce the demand for satellite power, data transmission capacity, processing capacity and cost; (3) formulate observation plans according to custom...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02
Inventor 刘喆张晓玲杨建宇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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