Terrain fusion method based on digital elevation model and radar active detection

CN117055046BActive Publication Date: 2026-08-28LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Patent Information

Application Number
CN202310862678.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-13
Publication Date
2026-08-28
Estimated Expiration
2043-07-13

AI Technical Summary

Technical Problem

[0002]毫米波防撞雷达具有体积小、分辨率高、全天时全天候等优势，是现在飞行器领域中使用和研制的主要防撞设备，但随着直升机朝着超低空高速突防的方向发展，现有防撞设备已经无法满足高速直升机的需求，主要体现在：①探测距离不足，随着飞行速度的提升，探测距离不变将导致飞行员没有足够的反应时间；②探测精度不足，飞行高度的降低对探测精度提出更高的要求，现有的防撞雷达在距离维上的精度基本可以达到要求，但在方位和俯仰方向上的精度还达不到要求；③三维重构精度不高、显示界面不够直观高效，受限于雷达的探测能力，无法对地形进行精细重构，增加了飞行员的判断时间和操作负荷

Benefits of technology

利用数字高程模型的高精度和高分辨率的优势弥补雷达的探测距离和探测精度的不足，并完成精细化地形三维重构，提高载机对高速低空飞行的适应性，降低飞行员对危险地形的辨识难度，提升雷达防碰撞的使用效率。防撞雷达的主动探测存在一定不足，如，雷达波束无法穿透山峰，其背后地形无法被探测；载机前方地形高度超出雷达俯仰上限，雷达探测到的地形高度低于实际地形，影响飞行安全；毫米波信号空间衰减大，探测距离有限等。而数字高程模型具有精度高，分辨率高，显示范围广等优势，可以有效弥补雷达不足；与此同时防撞雷达主动探测又对数字高程模型数据更新周期长，地形发生变化时无法及时增加显示内容的缺点进行了弥补。本发明充分发挥主动探测实时性高，以及数字高程模型精度高，分辨率高的特点，两者扬长避短互为补充，使飞行员更加全面、清晰的了解载机前方地形地貌，保障飞行安全。

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Abstract

The terrain fusion method based on a digital elevation model and radar active detection of the application comprises the following steps: obtaining terrain point information detected by radar antenna rows, compensating terrain point information detected by multiple antenna rows to the same coordinate system, and saving the terrain point information in the same coordinate system according to a preset interval of azimuth angle; fitting the terrain point information; eliminating height deviation after fitting; terrain fusion; and generating a terrain elevation map in front of a current carrier to improve the use performance of the radar.
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Citation Information

Patent Citations

  • Meter-wave radar terrain correction method based on digital elevation model

    CN108983169A