Construction of Augmented Proportion Navigation Law with Tracking Differentiator

A new approach of constructing augmented proportion navigation(APN) is investigated.Light of sight (LOS) angle velocity and acceleration are estimated using a tracking differentiator(TD) with filtering function. A coupler is constructed with a delay section and command softening sector to eliminate the bad effects of TD's transient process on guidance performance.Some typical applications of TDs are given.A new terse fast TD without chattering is designed based on the merits and drawbacks of typical TDs.Simulation results show that APN with TD has good guidance performance,and is simple to implement.