Analysis of Regional CORS Networks Contribution to Precise GPS Orbit and Clock Solutions for Supporting Real-Time Positioning
【摘要】：This work explores the benefits of using a regionally enhanced CORS network to derive GPS orbit and clock solutions for supporting real-time positioning. The regionally enhanced network is comprised of a global evenly distributed CORS network with addition of a densely distributed network in Australia and New Zealand region. A series of computational schemes and network configurations were computed with Gamit and PANDA software. The precise orbit result shows overall improvements (up to 14%) in the regionally enhanced solutions compared to the solutions derived from global network. Additionally, the orbital differences over GPS satellite arcs that are visible by any of the five chosen Australian CORS stations shows higher percentage of improvements compared to satellite arcs that are not visible. Analysis have also shown improvements in the regionally enhanced clock solutions where RMS for G65, G65+A50, G100 and G100+50 network configurations are 0.113ns, 0.090ns, 0.073ns and 0.070ns respectively. Finally Panda kinematic PPP results with regionally enhanced net-works shows marginal differences over the global network derived solution, 15.25cm, 15.00cm, 14.48cm and 14.75cm of 3D rms positioning error for G65, G65+A50, G100 and G100+A50 network configurations.