Propagation modeling for VHF/UHF-radar detection of targets behind a forest

Proceedings of the 1998 IEEE Radar Conference, RADARCON'98. Challenges in Radar Systems and Solutions (Cat. No.98CH36197) Pub Date : 1998-05-11 DOI:10.1109/NRC.1998.678022

H. Kuschel, D. Schneider

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Abstract

The detection of targets below line-of-sight has been one of the driving subjects in the research, related to the VHF-experimental radar LARISSA (Large wavelength Radar with Interference dependent Spectral Signal Adaptation), developed and operated at FGAN-FHP. A realistic prediction of the attenuation of electromagnetic waves caused by propagation through and above forest areas plays an important role for the configuration and performance evaluation of a VHF radar dedicated to detect hovering helicopters beyond terrain obstacles. In order to evaluate the transmission attenuation above a forest, measurements have been performed on a selected forest area near FGAN. The measurement results have been compared to a propagation model, which regards the forest as a sequence of ideally conducting diffraction screens. This study was conducted to develop, a generalized model for radio wave propagation above forests under the constraint of easy applicability to a coverage prediction model based on a digital terrain database. The measurements and calculations were restricted to horizontal polarization, as being of major importance for the detection of helicopter rotor echoes.

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VHF/ uhf雷达探测森林后目标的传播建模

视距以下目标的探测一直是研究的驱动课题之一，与FGAN-FHP研制并运行的vhf实验雷达LARISSA (Large wavelength radar with Interference dependent spectrum Signal Adaptation)有关。对穿越森林及森林上空的电磁波衰减进行真实预测，对超地形障碍物悬停直升机专用甚高频雷达的配置和性能评估具有重要意义。为了评估森林上方的传输衰减，在FGAN附近选定的森林区域进行了测量。测量结果与传播模型进行了比较，该模型将森林视为一系列理想传导衍射屏。基于数字地形数据库的覆盖预测模型易于适用的约束下，建立了森林上空无线电波传播的广义模型。测量和计算仅限于水平偏振，因为这对直升机旋翼回波的检测至关重要。

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Proceedings of the 1998 IEEE Radar Conference, RADARCON'98. Challenges in Radar Systems and Solutions (Cat. No.98CH36197)

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