Improvement of high accuracy DGPS with real-time WaveSmooth/spl trade/ multipath mitigation technique

The reduction of multipath has become an essential part of any high precise system architecture using satellite navigation. A recently proposed hybrid domain real-time WaveSmoothtrade multipath mitigation technique using wavelets is a simple and effective technique to offer reliable 50-90% multipath mitigation in a real-time high fidelity fashion. The improvement of high accuracy (cm level) differential Global Positioning System (DGPS) with WaveSmoothtrade multipath mitigation technique is studied in this paper. Two types of user solution approaches are compared: type I uses both code and carrier phase measurements; type II uses only carrier phase measurements. Analysis and simulation results indicate that type I approach results in better performance solution in terms of faster convergence in the fixed solution and overall accuracy. Field data test results show that the utilization of WaveSmoothtrade mitigated code measurements using the type I solution approach reduces the ambiguity resolution convergence time from about 380s to 90s and increases the ambiguity resolution success rate from 27% to 87%, for a 250km baseline. The conclusion is drawn that the WaveSmoothtrade technique improves DGPS positioning performance in terms of accuracy and ambiguity resolution convergence, as well as, implementation complexity/cost and real-time capability