A Calculation Method of Direction-finding Errors and Localization Errors by A Single Satellite
Based on the fact that the location of surface or sea radioactive sources can be realized instantaneously through one direction finding by a single satellite,this paper presents a positioning model based on the spaceborne direction-finding system.The error expression of phase interferometer direction-finding for two-dimensional arbitrary arrays is derived,and the computing methods of direction-finding localization error by a single satellite from azimuth-pitch and spatial angle are developed.The results of this method are close to the theoretical error value through numerical simulation.Thus,based on arbitrary two-dimensional arrays,the errors of direction-finding and localization in the observation area of the satellite can be quickly evaluated.Compared to direction-finding positioning,direct position determination(DPD)significantly reduces the localization error.
Single satellite direction findingDirection-finding errorLocalization errorDirect position determination(DPD)