On the intricacies of multi-epoch filtered PPP-RTK corrections and their impact on GNSS ambiguity resolution

Abstract

Precise point positioning real-time kinematic (PPP-RTK), by capitalizing on its state-space representation (SSR) and its associated flexibility, is naturally emerging as one of the prevalent Global Navigation Satellite System (GNSS) techniques for high-precision positioning. The determination of unbiased ambiguity-resolved positional parameters becomes possible once single-receiver users get access to SSR corrections. However, the fact that such SSR corrections are often estimated in a recursive manner, based on a set of assumptions and a singularity-basis (S-basis) choice made in an arbitrary fashion by the correction provider (i.e., a GNSS network), may lead to serious pitfalls which the P..