Regionally-derived orbit corrections in PPP-RTK: methodology and performance

Abstract

In integer ambiguity resolution enabled precise point positioning (PPP-RTK), satellite orbit information is a critical system input. Existing processing strategies generally fall into two categories: estimating satellite orbits as unknown parameters or fixing them using external orbit products. High-precision orbit determination typically relies on globally distributed GNSS networks. When fixed orbit strategies are adopted, two primary sources are available: broadcast ephemeris and precise orbit products. Although broadcast ephemeris are freely and independently available, their limited precision restricts their applicability to small-scale services, where orbit biases can largely be absorbe..