The weighted least squares algorithm based on precision factor versus distance residue in the application of DTMB assisted BeiDou positioning
The construction of the BDS3(BeiDou Narigation Satellite System 3)has been completed,which can provide more accurate positioning information in open areas.But the BeiDou signal is obscured in the urban canyon area.When the number of BeiDou satellites that can provide effective positioning information gradually decreases,the de-viation of the positioning results obtained by using the BeiDou satellites will gradually increase.In view of the above problems,based on the use of the digital terrestrial multimedia broadcast signal to assist the BeiDou,the weighted least squares algorithm based on the precision factor and the distance residual is used for positioning.Compared with the positioning using the least squares algorithm,its positioning accuracy is improved by about 40％to 50％.The algorithm proposed in this paper is useful for resolving the problem of adding different types of base stations to the auxiliary positioning when the number of base stations is insufficient.
improved weighted least squares algorithmprecision factordistance residualauxiliary localization
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