Target rotation angle estimating and transverse locating method for inverse synthetic aperture radar

A technology of inverse synthetic aperture and target rotation angle, which is applied in the field of target rotation angle estimation and lateral calibration of inverse synthetic aperture radar, and can solve the problems of low precision and large amount of calculation.

Inactive Publication Date: 2009-08-05
TSINGHUA UNIV
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Problems solved by technology

[0007] In order to overcome the disadvantages of large amount of calculation and low precision of the inverse synthetic aperture radar image horizontal calibrat

Method used

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  • Target rotation angle estimating and transverse locating method for inverse synthetic aperture radar
  • Target rotation angle estimating and transverse locating method for inverse synthetic aperture radar
  • Target rotation angle estimating and transverse locating method for inverse synthetic aperture radar

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Embodiment Construction

[0050] A method for estimating the rotation angle of an inverse synthetic aperture radar and for horizontal calibration of a target provided by the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] like figure 1 As shown, when the rotation speed and the rotation plane of the target relative to the radar are approximately constant, the received target echo data is segmented and imaged to obtain multiple ISAR image sequences about the target. According to the geometric relationship of ISAR imaging , extract the position of the scattering center and classify, track and correlate it, calculate the viewing angle difference between any two images, obtain the estimated rotational speed, and complete the horizontal calibration of the image.

[0052] During the acquisition process of a batch of target image data, the rotation vector of the radar relative to the target remains approximately constant, that i...

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Abstract

The invention discloses a rotating angle estimating and transverse picketage method for an inverse synthetic aperture radar (ISAR) object. Firstly, ISAR data is imaged section by section; the position information of a scattering center in each image is extracted, and the scattering centers of all images are associated; the scattering centers are classified according to the position information of the scattering centers; the scattering centers are combined in an optimizing mode according to the classification result; a visual angle difference between images formed twice is estimated; the rotating speed of the object with respect to a radar is estimated combining the interval of the images formed twice; and a concerned rotating angle is obtained according to pulse count accumulated by the ISAR images so as to determine the transverse size of the images. The invention does not need to suppose a point scattering model and can restrain the influence of migratory motion of an exceeding resolution element. The treatment for an image field is suitable to select the scattering centers and optimize the estimating result. Compared with a picketage method of a time domain, the invention reduces the amount of calculation the picketage and improves the reliability of the picketage.

Description

technical field [0001] The present invention relates to the technical field of radar, and more specifically, the present invention relates to a target rotation angle estimation and lateral calibration method of an inverse synthetic aperture radar. Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) can provide two-dimensional images of moving targets (such as aircraft and ships), thereby enhancing the subsequent target recognition capabilities. ISAR provides high-resolution capabilities along the radar line-of-sight direction (range direction) by transmitting broadband signals, and provides lateral resolution capabilities by coherently accumulating changes in the relative viewing angle between the radar and the target. The resolution in the range direction depends on the bandwidth of the radar transmission signal, which is usually a known quantity; while the lateral resolution depends on the change in the relative viewing angle during the coherent accumulat...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/40
Inventor 叶春茂许稼彭应宁王秀坛左渝戴喜增
Owner TSINGHUA UNIV
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