A Study on an Improved Guidance Law Which is Insensitive to the Time-to-Go Estimation Error

PN (proportional navigation) law is in wide use. In this paper, the traditional proportional navigation control system is analyzed, then we find that the traditional proportional navigation guidance law is sensitive to the time-to-go (i.e., time to interception) measurement, in other words, the time-to-go estimation error may cause significant degradation in the performance of the PN guidance law. In this paper, we design a new guidance law which is called reduced sensitivity guidance law (RSL) to solve the problem. At the end of the article, the simulation results show that the RSL method is insensitive to the time-to-go estimation error and the performance of the RSL guidance law system is improved.