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本文介绍了一种在未知多路径反射特性的地面上,对低仰角辐射源的跟踪可达零点几个波束宽度的系统。这种系统有三个主要特点:(1)使用频率分集对多路径反射信号解相关;(2)使用高效率的宽带多波束天线,因此数据可以用高度对称的Toeplitz相关矩阵来表征;(3)使用布尔格(Burg)反射系数法使最大熵谱快速收敛以确定目标位置。仿真试验(包括不完全解相关,天线误差和暂态结果)表明,利用实用天线及合理的数据处理时间,这个系统可以提供准确的低仰角估值。
This paper presents a system for tracking low-elevation radiation sources up to zero beamwidths on the ground with unknown multipath reflectivity. The system has three main features: (1) the use of frequency diversity to de-correlate multipath reflected signals; (2) the use of high-efficiency wideband multibeam antennas so that the data can be characterized by highly symmetric Toeplitz correlation matrices; (3) The Burg reflection coefficient method is used to quickly converge the maximum entropy spectrum to determine the target position. Simulation experiments (including incomplete decorrelation, antenna error, and transient results) show that this system can provide accurate low-elevation estimation with a practical antenna and reasonable data processing time.