Patent ID: 6359586
Filing Date: 2002-03-19
Classification: G01S

Abstract:
A bias estimating method for a target tracking system, comprising the steps of:collecting target tracks (T) and associated measurements (M) from said target tracking system; calculating estimates of bias parameters (b) based on said target tracks (T) and associated measurements (M); providing said target tracking system with said calculated estimates of bias parameters (b), characterized in that the calculating step comprises the steps of: generating an error function, comprising at least two terms, where a first term is dependent of at least the magnitude of the discrepancy between measurements and a measuring model, where the measuring model is a model function of an unknown target position and unknown bias parameters, and where a second term is dependent of at least predetermined evaluations of the a priori statistical distributions of the bias errors (15) and said unknown bias parameters; and minimising said error function with respect to said bias parameters as well as said target position.