Abstract: The observation data association of the same object before computing the initial orbit is a crucial problem for the double fence radar system. An estimating Doppler velocity method was proposed, which was independent of initial orbit determination with iteration computation, and a corresponding data ssociation rule was designed. The simulation analysis shows that the exactness of the proposed data association rule is similar with that of the rule which is dependent on the Doppler velocity computed by the orbit determination, but the computing time is less than 10% of the latter one.

Key words: Estimating Doppler velocity, Data association, Double fence radar, Spaceobjectsurveillance