Missile Guidance Law Estimation Using Modified Interactive Multiple Model Filter

Abstract

This paper presents an interactive multiple-model-based guidance law estimation filter. An antiship missile’s threat index, such as the remaining time of flight and impact angle, can be estimated by using the guidance law estimation filter. The filter bank of the filter was composed of models based on proportional navigation and impact angle control guidance laws. In the guidance law estimation filter, state variables, rather than fixed values of navigation constant or impact angle, are used for estimation. To that end, the modified interactive multiple model, which is a modified version of the conventional interactive multiple model method is presented in this paper. The modified interactive multiple model method minimizes the degradation of estimation performance by systematic approach for different state vectors. The effectiveness of the modified interactive multiple model method and the performance of the guidance law estimation filter are examined through the numerical simulation of various engagement scenarios.