海面多路径效应对被动微波测角的影响分析

Simulation analysis on influence of sea surface multipath effect on PRS angle measurement

在拦截超低空目标时,海面多路径效应会严重影响被动制导型舰空导弹的测角精度。首先阐述海面多路径效应产生机理,然后结合旋转式相位干涉仪的测角原理,通过建立海面多路径镜面反射几何模型,给出了双天线直达信号和镜面反射信号表达式。在此基础上,选取典型超低空弹道,根据仿真结果代入多路径计算模型,分析超低空弹道多路径效应对测角精度的影响。仿真结果表明,海面多路径效应对被动微波体制导引头测角影响显著,为下一步研究抑制多路径影响措施提供了重要参考。

As attacking the ultralow？altitude targets,the sea surface multipath effect has great influence on passive radar seeker （PRS） angle measuring precision of ship？to？air missile. The occurring principle of sea surface multipath effect is de？scribed. The specular reflection geometric model of the sea surface multipath effect is built in combination with the angle measuring principle of rotating phase interferometer. By this model,the expressions of direct signal and specular reflection signal of dual？atenna are given. On this basis,typical low？altitude ballistic trajectories are selected to analyze the influence of the multipath ef？fect on the angle measuring accuracy according to the results of the simulation calculation in multipath effect model. The simula？tion results show that sea surface multipath effect affects PRS angle measuring accuracy significantly. The achievement provided an important reference for the next research on restraining multipath effect.