The Method of Distinguishing and Rejecting the Unruly-valuein the Target-tracking System

In the target-tracking system,the measured value of the target coordinates not only includes the random error,but also sometimes includes the bulky error caused by the factors of interference etc.This kind of error is usually called unruly-value,and its value is far larget than the random error.The measured value with the unruly-value will not only cause the measure error and the memory effect,but also make the filter system divergence.Therefore,the umruly-value should berejected.Through analyzing the principle of Kalman filter,this paper discusses the method of distinguishing and rejecting unruly-value based on the Kalman filter.At the same time,it puts forward a method of calculating threshold to distinguish unruly-value.