Continuous-Discrete Quadrature Filters for Intercepting a Ballistic Target on Reentry using Seeker Measurements

摘要

In this work, a real-life ballistic target tracking problem is solved with continuous-discrete (CD) quadrature filters, where the measurements are obtained from an inbuilt seeker of an interceptor. To obtain a more accurate approximation of the stochastic differential equation representing the process dynamics, Ito-Taylor expansion of order 1.5 is used. Further, the estimated states are fed to a guidance block which is implemented using proportional navigation guidance (PNG) law. The performance of the closed loop interceptor is studied in terms of root mean square error (RMSE) of target-interceptor states and miss-distance. It has been observed that the RMSE and miss-distances obtained from the CD quadrature filters are less when compared to the discrete-discrete quadrature filters.