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Interference reverse synthetic aperture radarimaging method based on multiple-spot

An inverse synthetic aperture and radar imaging technology, applied in the radar field, can solve the problems of image edge blur, InISAR image not being obtained, and imaging quality degradation, etc., and achieve the effect of less calculation and low complexity

Inactive Publication Date: 2007-07-18
XIDIAN UNIV
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Problems solved by technology

[0005] In the traditional point-by-point interferometric inverse synthetic aperture imaging process, due to the different positions of the antennas, there is a Doppler mismatch between the ISAR images used for the interference, and some "bad" points will appear, which will reduce the imaging quality , e.g. to blur the edges of the image
If the echo signal received by the radar receiver is polluted by noise, when the noise is large enough, the traditional InISAR imaging method will fail, and the InISAR image of the target cannot be obtained.

Method used

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Embodiment Construction

[0038] 1-7, the implementation process of the method of the present invention will be described first.

[0039]The present invention takes an aircraft model with 330 scattering points as an example to carry out a simulation test. The distance-azimuth (length-width) top view of the model is shown in Figure 5 below, and its length, width and height are 70m, 60m and 9m respectively. The radar center frequency is 5GHz, the wavelength is 6cm, and the signal bandwidth is 400MHz; when the plane takes off, the target is 20Km away from the radar; the turntable model is used, the rotation speed is 0.5° / s, and the accumulation time is 5 seconds; in order to illustrate the phase winding problem, the antenna spacing here is 60m. The horizontal placement of the antenna can measure the range-azimuth image of the target, and the high-low configuration can measure the distance-elevation image; the distance-azimuth image is used as an example in the experiments to illustrate the present inventi...

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Abstract

An imaging method of interference fitting aperture radar based on multiple ultra-displayed point includes selecting out pixel point with heavy energy named as ultra-displayed point from ISAR image, using interference means to obtain phase main value, making dewrapping on said main value to obtain true value of each ultra-displayed point, carrying out scaling on said point to obtain Doppler frequency and horizontal distance, fitting out relation of said frequency to said distance and carrying out scaling on each pixel point of ISAR image to obtain In ISAR image reflecting true size of object.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to an interferometric inverse synthetic aperture radar imaging method based on multi-characteristic prominent points, which is used to obtain an image reflecting the real geometric size of a target. Background technique [0002] Radar imaging technology was developed in the 1950s, and it is an important milestone in the development of radar. Since then, the radar not only regards the observed object as a "point" target to determine its position and motion parameters, but can obtain images of the target and the scene. At the same time, due to the radar's all-weather, all-day, long-distance and wide observation band, and the ability to easily distinguish moving targets from fixed backgrounds, radar imaging technology has received extensive attention. Inverse Synthetic Aperture Radar (ISAR) is an important development in the field of radar imaging. In the early 1980s, inverse synthetic ...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/02
Inventor 刘宏伟李丽亚
Owner XIDIAN UNIV
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