An accurate calculation method, device and equipment for ISAR imaging corner turning

By calculating the angle between the ground-based radar and the target in the geocentric coordinate system, the problem of insufficient accuracy in calculating the rotation angle of ISAR imaging in medium- and high-orbit long-distance observation scenarios is solved, and higher imaging quality and application efficiency are achieved.

CN120233363BActive Publication Date: 2026-06-09XIDIAN UNIV
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Patent Information

Application Number
CN202510374268.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-27
Publication Date
2026-06-09
Estimated Expiration
2045-03-27

AI Technical Summary

Technical Problem

In the context of long-distance observation in medium and high orbits, existing technologies suffer from insufficient accuracy in calculating the rotation angle of ISAR imaging, leading to decreased imaging quality and distortion of target features, thus limiting the application effectiveness of ISAR technology.

Method used

By acquiring the target's coordinates in the radar's geodetic coordinate system and transforming them to the geocentric coordinate system, the angle between the ground-based radar and the target is calculated. Combined with the line-of-sight vector between the geocentric radar and the target, the ISAR imaging rotation angle is accurately calculated, avoiding the limitations of traditional methods.

Benefits of technology

It improves the calculation accuracy of ISAR imaging rotation angle, thereby enhancing the imaging quality and application efficiency in medium- and high-orbit long-distance observation scenarios.

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Abstract

The application provides an accurate calculation method, device and equipment for ISAR imaging rotation angle. The method comprises the following steps: obtaining first coordinate information of a target in a radar large earth coordinate system; converting the first coordinate information into a geocentric coordinate system to obtain third coordinate information; calculating a first included angle and a second included angle by using the third coordinate information in the geocentric coordinate system; and calculating the ISAR imaging rotation angle by using the first included angle and the second included angle. In the application, the spatial relationship among the geocenter, the ground-based radar and the target is coupled and calculated through the conversion among the coordinate systems, so that the correlation between the rotation angle value and the target orbit radius is generated, the limitations brought by the two-by-two spatial calculation model (radar-satellite, geocenter-satellite) of the traditional method are avoided, the accuracy of the imaging rotation angle calculation is improved, and finally the application efficiency of the ISAR technology in the medium-high orbit long-distance observation scene is improved.
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