Modeling And Simulation Of Multipath Effects On Passive Radar Seeker

In order to improve the precision of tracking low elevation targets for the missile, we must know how the multipath propagation influenced the missile tracking. In this paper, we discuss the multipath model and the multipath effect for the interferometer passive seeker of the anti-anti-ship-missile. In two different conditions, the flat cement ground and the rough sea surface, we both analyse the multipath effect on the elevation measurement and set up multipath model for it.While the surface is smooth, the specular multipath is very distinct, according to this, wefirst discuss the multipath effect model of the flat cement ground. In this model, we analyse the direct signal and specular signal expression, and compare the phase of the total echo signal to resolve the angle-measuring ambiguity, then we get the elevation simulation results having no-ambiguity . We compared the simulation result with the outfield experiment result. It validated the rationality of the multipath model. The simulation and the experiment indicated that the error caused by multipath effect was more serious while the elevation becomes small.The sea surface multipath effect will seriously depress the Anti-anti-ship missile tracking precision under low-elevation scenarios. So this article further discussed the sea multipath modeling and the influence to the angle measurement of the seeker based on previous flat cement ground work. We first simulate the rough sea surface with three different methods, and then at the surface simulated by the ocean wave spectrum, we set a sea surface multipath model and analyse the multipath effect. The results indicate that the multipath effect declined when the sea wind become large.