Abstract: Based on the previous paper of the author the two methods of simplified adaptive filter for tracking maneuvering target are presented in this paper. One is the two mode of Kalman filter, the other is the constant gain adaptive filter with variable sampling rate which is discussed in detail. Concerning the critical problem of how to change the sampling rate an adapive algorithm equivalent to the optimal test statisics is suggested, which is more reasonable in theory and is more applicable in engineering compared with the methods of cohen and Gardner. The simulation example given in the paper shows that the two methods have the performance comparable to the method suggested by the author previously.

Key words: maneuvering target, variable sampling rate, adaptive filter