3D Mapping Database Aided GNSS RTK and Its Assessments in Urban Canyons

Ng H.F., Hsu L.T.

IEEE Transactions on Aerospace and Electronic Systems (2021)

Key idea. Carrier-phase RTK collapses in urban canyons because reflected (NLOS) signals corrupt ambiguity resolution. This work brings a 3D building model into the RTK engine to predict and exclude NLOS satellites before they poison the solution.

Impact. It demonstrated that map-aware RTK can hold centimetre-class fixes in environments where conventional RTK fails — a building block of the lab’s 3D-mapping-aided GNSS line and its smartphone/automotive applications.