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Radar imaging method based on distance image and ISAR image fusion

A radar imaging and range imaging technology, applied in the field of radar imaging, can solve the problems of small accumulation angle, slow model rotation speed, slow driving speed, etc.

Pending Publication Date: 2021-03-26
HARBIN INST OF TECH
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Problems solved by technology

However, the size of the accumulation angle directly affects the high resolution of the lateral distance. If the angle is too small, the resolution of the lateral distance is low, and a series of effects such as crossing the distance unit will occur.
[0005] When mmWave radar is used to perform ISAR imaging of a driving vehicle, because the vehicle is traveling at a slower speed, the rotation speed of the model is slower when it is equivalent to a turntable model, the accumulation angle is smaller, and the lateral resolution is lower

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  • Radar imaging method based on distance image and ISAR image fusion
  • Radar imaging method based on distance image and ISAR image fusion
  • Radar imaging method based on distance image and ISAR image fusion

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specific Embodiment approach 1

[0049] Specific implementation mode one: refer to Figures 1 to 10 This embodiment is described in detail, a radar imaging method based on the fusion of range image and ISAR image described in this embodiment. There are two radars in the imaging scene, the sight directions of the two radars are perpendicular to each other, one of the radars is a horizontal radar, and the other radar is a longitudinal radar.

[0050] Such as figure 1As shown, it is assumed that the azimuth beamwidth in the imaging scene is calculated as -45° to 45°, and the vertical beamwidth is calculated as -20° to 20°. The distance from the two radars to the center of the scene is both 50m, so the azimuth width that the horizontal radar can observe is -50m to 50m, and the vertical width that the longitudinal radar can observe is -18m to 18m. The target moves along the longitudinal radar line of sight, and the target speed is set at 12m / s, which is about 43.2km / h. The radar acquisition is collected by fram...

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Abstract

The invention discloses a radar imaging method based on distance image and ISAR image fusion, relates to the technical field of radar imaging, and aims to fuse multi-radar data so as to improve the imaging quality. According to the radar imaging method based on distance image and ISAR image fusion, two radars are vertically arranged, one radar is used for ISAR imaging, the other radar is used forobtaining a one-dimensional distance image of a target, and high resolution of the longitudinal distance of the longitudinal radar is used for compensating the resolution of the transverse distance inthe ISAR image of the transverse radar.

Description

technical field [0001] The invention belongs to the technical field of radar imaging. Background technique [0002] The radar transmits broadband signals (77GHz millimeter-wave radar bandwidth B can reach more than 2GHz) and can obtain high-resolution target distance through matched filtering or pulse compression technology, and the distance resolution is C / 2B, so as to obtain high-resolution one-dimensional distance in the radar line of sight direction Each pulse or FM signal cycle corresponds to a range image. The one-dimensional range image expresses the projected distribution of the target's three-dimensional space scattering on the radar line of sight. The radar signal accumulation time is related to the residence time of the target in the radar beam. However, only the high resolution of one-dimensional distance cannot meet the current needs. The actual target has three-dimensional coordinates, so it is necessary to obtain high resolution of distance in another dimens...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9064G01S13/9021
Inventor 陈锐达姜义成胡滨刘子滔
Owner HARBIN INST OF TECH
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