Going Direct: Improved Accuracy from Reflected Signals and Path Predictions - Inside GNSS
Conclusion
A new DPE method that incorporates visibility and specularity information using specular matching improves position solutions in several highly blocked and reflective environments. The predictions allow NLOS and absent signals to contribute to the position solution. Tests on several data sets showed them to be effective only in environments where there is very limited visibility. The improvement in these cases reduced the RMS horizontal position errors from 30m to 10m. We plan to investigate these and other data sets to better understand the conditions under which urban model-based predictions can enhance GPS positioning performance.
