Aiming at multi-source measure data fusion process of low earth orbit (LEO) combined orbit determination (COD) based on bi-satellite positioning system (BPS), two sorts of multi-source data fusion measure models based on independent same distribution and correlation of measure noises were constructed, and a method based on matrix decomposition and noises de-correlation was put forward. A multi-structural nonlinear optimal weighting parameters estimation algorithm of multi-source data fusion meas
