Do GNSS parameters always benefit from integer ambiguity resolution? A PPP-RTK Network Scenario

Abstract

In this contribution we study the impact of integer ambiguity resolution (IAR) on the precision of GNSS estimable parameters. In doing so, a multivariate formulation of the GNSS undifferenced observation equations of a PPP- RTK network is presented, where appropriate one-to-one transformations to the parameters ease our analysis. Functions of the estimable slant ionospheric delays are shown to have distinct responses to IAR, ranging from zero (of a satellite-/receiver-averaged type) to very significant (of a double-differenced type). While the satellite-/receiver- Averaged components of the estimable clocks and phase biases on a particular frequency remain unaffected after IAR, the precision..