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Image fusion method of double/multiple base inverse synthetic aperture radar

An inverse synthetic aperture and radar image technology, applied in the radar field, can solve problems such as low lateral resolution, poor viewing angle, and difficulty in extracting imaging information

Inactive Publication Date: 2010-03-31
TSINGHUA UNIV
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Problems solved by technology

[0005] In order to overcome the defects of low lateral resolution of existing radar images and difficult and inaccurate extraction of imaging information during multi-view image synthesis, the present invention proposes a method based on the extraction of sub-pixel-level scattering center positions in adjacent RD images. Image Fusion Method of Target Rotational Speed ​​and Target Equivalent Center of Rotation

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  • Image fusion method of double/multiple base inverse synthetic aperture radar
  • Image fusion method of double/multiple base inverse synthetic aperture radar
  • Image fusion method of double/multiple base inverse synthetic aperture radar

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Embodiment Construction

[0060] A bistatic / multistatic Inverse Synthetic Aperture Radar (ISAR) image fusion processing method provided by the present invention will be described in detail below in conjunction with the accompanying drawings and an embodiment based on the bistatic ISAR configuration of self-transmission and self-reception.

[0061] In one embodiment according to the present invention, figure 1 Shows the geometric model of bistatic ISAR for imaging a rotating body. In this example, it is assumed that the self-transmitting and self-receiving bistatic ISAR system has the same system parameters such as baseband signal bandwidth and carrier frequency, and simultaneously transmits orthogonal waveforms. The two radars Polar coordinates (R AO , β A ) and (R BO , β B ), the plane formed by the target rotation center is perpendicular to the rotation axis of the uniformly rotating target.

[0062] figure 2 Show the scattering point target model, in the present embodiment, the main simulation...

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Abstract

The invention discloses an image fusion method of a double / multiple base inverse synthetic aperture radar (ISAR), comprising the following steps: equally dividing target echo signals received by all bases and acquiring two range-Doppler (RD) images; extracting more than three more stable specially obvious points from the target RD images acquired from all the bases, and estimating visual angle differences of any two RD images; combining the visual angle differences and obtaining the estimation of rotation speed of the target and the estimation of the visual angle differences among the double / multiple bases; after obtaining the estimation of the rotation speed of the target, estimating an equivalent rotating center of the target; after knowing the target motion information, obtaining scaling RD images of data of all the bases; also obtaining a polar coordinate imaging result or convolution / inverse projection imaging result of the data of all the bases; and obtaining an imaging result of double / multiple base data level fusion.

Description

technical field [0001] The present invention relates to the field of radar technology, and more specifically, the present invention relates to a bistatic / multistatic inverse synthetic aperture radar image fusion processing method. Background technique [0002] Inverse synthetic aperture radar (ISAR) can provide two-dimensional images of non-cooperative 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. When the angle of view of the target accumulated in the image has little change, the range-Doppler (RD) image of the target can be obtained by using efficient FFT processing. [0003] According to the principle of ISAR imaging, when the angle...

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Application Information

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IPC IPC(8): G01S7/02G01S7/48G01S13/90G01S17/89
Inventor 叶春茂许稼彭应宁王秀坛左渝
Owner TSINGHUA UNIV
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