Bistatic synthetic aperture radar imaging method on basis of Doppler frequency expansion

A technology of synthetic aperture radar and Doppler frequency, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve complex problems such as solving two-dimensional spectrum

Inactive Publication Date: 2014-01-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a bistatic synthetic aperture radar system imaging method based on Doppler frequency expansion in order to solve the double root sign problem of bistatic slant distance history and overcome the shortcomings of complex two-dimensional spectrum calculation

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  • Bistatic synthetic aperture radar imaging method on basis of Doppler frequency expansion
  • Bistatic synthetic aperture radar imaging method on basis of Doppler frequency expansion
  • Bistatic synthetic aperture radar imaging method on basis of Doppler frequency expansion

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Embodiment Construction

[0104] The present invention mainly adopts the method of simulation experiment to verify the feasibility of the scheme, and all steps and conclusions are verified correctly on MATLAB7.0.

[0105] In this example, the transceiver platforms are used to fly parallel and in the same direction, and the antenna beam speeds of the two platforms are 2100 (meters per second) and 700 (meters per second) respectively. The center frequency of the transmitted signal is 9.65GHz, the pulse repetition rate is 2500Hz, and the time width of the transmitted signal is 2 (microseconds). Other parameters of the system platform are as follows: Figure 4 shown. The total length of the X-axis of the observation area is 1000 meters, and the total length of the Y-axis is 200 meters. There are 5 reflection points distributed in the entire observation area. The distance between two adjacent points is 250 meters, and the distance in azimuth is 100 meters. The coordinates of the reference point A are (0,70...

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Abstract

The invention discloses a bistatic synthetic aperture radar imaging method on the basis of Doppler frequency expansion. The bistatic synthetic aperture radar imaging method includes performing Taylor expansion on an accurate two-dimensional frequency spectrum expression of bistatic SAR (synthetic aperture radar) about Doppler frequencies and simplifying solving of the two-dimensional frequency spectrum expression; acquiring a two-dimensional STOLT relation of a system by the aid of an idea of an omega-k algorithm according to the two-dimensional frequency spectrum expression; performing approximation two-dimensional STOLT interpolation by means of two-dimensional non-uniform Fourier transform by the aid of the two-dimensional STOLT relation to complete imaging of the system. Compared with the traditional method, the bistatic synthetic aperture radar imaging method has the advantages that the bistatic synthetic aperture radar imaging method is based on simple and accurate two-dimensional frequency spectra, so that point targets can be focused excellently; the influence of high-order terms of the Doppler frequencies on imaging results is sufficiently considered, so that scenes can be precisely imaged by an imaging algorithm; the complexity of the bistatic imaging algorithm can be reduced to a great extent owing to the fact that only the Doppler frequencies need to be considered.

Description

technical field [0001] The technical invention belongs to the technical field of radar, and relates to the technical field of Bistatic Synthetic Aperture (BiSAR) radar imaging. Background technique [0002] Bistatic synthetic aperture radar (BiSAR for short) refers to a radar system in which the transmitting and receiving antennas are separated on two different moving platforms. Compared with single-base SAR, bistatic SAR has the advantages of special structure, high security, good concealment, strong anti-interference ability, low cost and strong flexibility, and can realize some special modes that single-base SAR cannot achieve. Such as forward-looking imaging. Bistatic imaging is a very valuable imaging mode, which can be applied to missile navigation, aircraft navigation and landing in bad weather, etc. In view of the multiple advantages of bistatic SAR, the research on bistatic SAR imaging technology is of great significance. [0003] Since the expression of the two-...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S7/41G01S13/90G01S13/9011G01S13/9058
Inventor 张晓玲张龙陈远河时代奇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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