State estimation and validation of currents using Delft GNSS single-frequency precise point positioning algorithm: With emphasis on the variance model

The Delft real-time GNSS single-frequency precise point positioning (RT-SF-PPP) algorithm is extended to include velocity and receiver clock drift as unknown states to be estimated from Global Navigation Satellite Systems (GNSS) measurements. Carrier-phase ambiguities are assumed constant over time. Two different variance models are used, one...

Influence of the inhomogeneous troposphere on GNSS positioning and integer ambiguity resolution

The tropospheric delay is one of many error sources that affect the Global Navigation Satellite System (GNSS) positioning solutions. The widely used troposphere models assume a homogeneous atmosphere so that only the zenith delay needs to be determined and is mapped through an elevation-dependent mapping function. This procedure is to reduce...

Precise point positioning on the reliable detection of tropospheric model errors

Precise point positioning (PPP) is one of the well-known applications of Global Navigation Satellite System (GNSS) and provides precise positioning solutions using accurate satellite orbit and clock products. The tropospheric delay due to the neutral atmosphere for microwave signals is one of the main sources of measurement error in PPP. As...

Assessing the performance of multi-GNSS PPP-RTK in the local area

The benefits of an increased number of global navigation satellite systems (GNSS) in space have been confirmed for the robustness and convergence time of standard precise point positioning (PPP) solutions, as well as improved accuracy when (most of) the ambiguities are fixed. Yet, it is still worthwhile to investigate fast and high-precision...

Next Generation Precise Satellite Positioning: Analysis of advanced positioning techniques with multiple navigation satellite systems using Curtin's PPP-RTK User Platform

Many different Global Navigation Satellite Systems (GNSS) are currently in orbit or are being deployed. Research on positioning techniques using these satellites is ongoing. The Curtin GNSS Research Centre has developed a software tool for further testing of these techniques. This thesis represents the testing done on the Curtin PPP-RTK User...

On User Algorithms for GNSS Precise Point Positioning

Precise Point Positioning (PPP) is a Global Navigation Satellite System (GNSS) processing method with the objective of providing high positioning accuracy without the need for a nearby base station or dense network of reference stations operated by the user. To reach this objective, PPP uses the very precise carrier phase measurements in...

GNSS algebraic structures

The first objective of this paper is to show that some basic concepts used in global navigation satellite systems (GNSS) are similar to those introduced in Fourier synthesis for handling some phase calibration problems. In experimental astronomy, the latter are at the heart of what is called ‘phase closure imaging.’ In both cases, the analysis...