A DIGITAL KALMAN FILTER FOR RADAR TRACKING WITH FILTER GAINS INDEPENDENT OF SAMPLING INTERVAL

Abstract

In radar tracking using digital Kalman filter, it often becomes necessary to change the sampling rate. As the filter gains to be used in computation are dependent on the sampling rate, it becomes necessary to employ a large memory in the filter to store the time varying filter gains corresponding to each possible value of the sampling interval. In this paper, a method of reducing the total memory requirements and consequently, the number of computations, is proposed through a transformation which makes the filter gains independent of the sampling rate. A block diagram of the system for realizing the proposed digital filter using simple digital circuits such as adders, multipliers, shift registers, etc., which are well suited for integrated circuit(including both MSI and LSI) implementation, is also presented.