CS-LFMCW雷达角度信息提取及其精度影响因素

Influencing Factors on Angle-Measurement Accuracy of CS-LFMCW Radar

线性调频连续波(LFMCW)与圆锥扫描(CS)相结合的雷达体制,可在获得目标高分辨距离像的同时分别测得各个散射中心的角度信息,从而有利于对距离扩展目标的检测和识别。文中给出了圆锥扫描线性调频连续波(CS-LFMCW)雷达信号的形式,研究了角度信息提取方法,详细分析了噪声、天线旋转不稳定、泄漏、弹体旋转等非理想因素对角度信息提取精度的影响,并提出了相应的解决方法。仿真结果验证了分析的有效性。圆锥扫描线性调频连续波雷达具有距离分辨率高、结构简单、体积小、重量轻、能够获取角度信息等优点,因此在近距离、末制导雷达中有着广泛的应用前景。

The radar system based on the combination of linear frequency-modulated continuous wave （LFMCW） with conical scan（CS-LFMCW） can not only obtain high range resolution profile（HRRP）, but also ensure the exact angle information of each scattering centre on spatially distributed targets to be detected respectively, which facilitates the detection and recognition of the spatially distributed targets. In this paper, signal form of the conical scan LFMCW radar is given, and angle measurement method is studied. Influences of such non-ideal factors as noise, unstable antenna rotation, leakage and missile rotation on angle-measurement accuracy are analyzed in detail, and possible methods to overcome these adverse influences are also presented, which are proved to be correct and feasible by computer simulation. CS-LFMCW radar has some advantages, such as high range resolution, simple structure, small volume, light weight and acquisition of angle information, which make it widely be applied in near-range terminal-guidance radar.