海面多径环境下雷达目标俯仰角测量提取的研究与应用

在单脉冲测角体制下,由于多径回波信号的干扰,极大地影响了雷达对低空目标俯仰角的测量。通过对多路径反射环境模型分析,同时考虑镜面反射和漫反射的干扰,得出了岸、海基单脉冲雷达低空目标跟踪时俯仰角测量误差的产生原因,将传统的多目标分辨算法(C2算法)与偏差补偿技术相结合应用于低角多径环境下偏轴跟踪目标俯仰角的测量,弥补两种算法各自的不足。在给定的测量环境下对不同高度目标进行仿真,得到良好的仿真结果,表明两种算法结合使用,可较大地提高低空目标偏轴跟踪俯仰角的测量精度。并将其应用于某型雷达对掠海巡航飞行目标测量数据事后俯仰角的提取,与雷达实时输出的俯仰角测量数据相比,验证了该算法的有效性和可实施性。

Research and Application of Radar Target Elevation Measurement Extraction in the Presence of Sea-surface Multi-path

In the presence of sea-surface multi-path,due to the interference of multi-path reflection,the measurement of a low elevation target by monopulse is often greatly affected.So off-axis tracking technique was adopted generally.By means of the analysis based on the model of multi-path reflection environment,both specular reflection and diffuse reflection were considered.Expression for the average bias in the mono-pulse ratio due to specular and diffuse reflections and the noise in the radar channel was derived.Algorithm was combined with bias compensation so as to adapt to the elevation measurement of off-axis tracking targets in the presence of sea-surface multi-path. This is aimed to avoid the disadvantage of both techniques employed here.Throughout the simulation in some scenarios,the results show that the method combining the two algorithms together can improve the precision of low-altitude target elevation measurement.Then it was applied in the extraction of postal data of off-line cruising flying object's elevation measurement,and a comparison was made with real time data elevation measurement by actual radar system.The results indicate that this method is effective and feasible in the off-line elevation extraction and it can remarkably improve the precision of elevation measurement.