Non-difference And Non-combination Precise Point Positioning Based On BDS

GNSS Precise Point Positioning(PPP)can obtain decimeter to centimeter-level positioning accuracy in real-time model and millimeter-level positioning accuracy in static model with a single receiver on a global scale.With the rapid development of PPP technology,Non-difference and non-combination PPP has become a hotspot.China's independent research and development of BDS has a regional navigation and positioning capabilities,research BDS non-difference and non-combination PPP,analysis of its parameter estimation accuracy has important theoretical significance and practical value.The basic theory of non-difference and non-combination PPP is studied,and the main error sources and correction methods are analyzed deeply.The non-difference and non-combination PPP delay processing method is studied emphatically.Programming to achieve BDS non-difference and non-combination PPP,using 4 CORS station data and the satellite orbit and clock products provided by GFZ to carry out related experiments.Mainly including static and dynamic PPP experiments.The experimental results show that the Kalman filter static PPP plane orientation accuracy is about 2 cm,the elevation direction positioning accuracy is about 7 cm,and the positive and negative filtering static PPP plane The direction of positioning accuracy of about 2 cm,elevation positioning accuracy of about 4 cm.Simulation of real-time dynamic PPP positioning accuracy of about 6 cm,the elevation direction of positioning accuracy of about 13 cm;post-processing dynamic PPP plane positioning accuracy of about 6 cm,elevation direction positioning accuracy of about 11 cm.BDS ZTD estimated accuracy of 1.4 cm or so.It can be shown that the positioning accuracy of BDS non-difference and non-combination PPP can reach a high level and has wide application prospect.