Abstract:We compare the difference of BDS attitude models published by different analysis centers, and find that the difference of the yaw angle can be nearly 180° at noon and earth shadow time. Furthermore, we compare the effects of three attitude strategies, namely quaternion attitude, model attitude and nominal attitude, on the phase wind-up correction and the final positioning results of precise point positioning(PPP). The results show that different attitude processing models will bring phase wind-up correction difference of nearly 1 cycle. Compared with the nominal attitude RMS, the PPP positioning results of quaternion attitude decreased by 17%, 25%, 34%, respectively, and compared with the model attitude RMS, decreased by 11%, 7%, 7%, respectively. Keeping the consistency of products of the analysis center can improve the precision of PPP.