propagation of radio waves through the troposphere is based on minimum travel time between transmitter and receiver. the troposphere layer affects the propagation of gnss signals and causes errors in point positioning due to (1) delay of the signal, and (2) change of the curvature of the signal path. for this reason gnss users apply models for tropospheric error corrections. one of the commonly...

In this paper a practical method for tropospheric effects on GPS derived coordinates in absolute mode is presented. GPS observations at the permanent GPS stations can be used as source of information for the modeling. The developed model is a time-dependent model and as such differs from usual tropospheric models, which are based on atmospheric parameters, i.e. temperature, pressure and humidit...

in this paper a practical method for tropospheric effects on gps derived coordinates in absolute mode is presented. gps observations at the permanent gps stations can be used as source of information for the modeling. the developed model is a time-dependent model and as such differs from usual tropospheric models, which are based on atmospheric parameters, i.e. temperature, pressure and humidit...

The low latitude ionosphere poses a challenge to both GPS users and Satellite-Based Augmentation System (SBAS) providers. Single and dual frequency GPS receivers used in low-latitude regions can suffer from rapid amplitude and phase fluctuations known as scintillation. Scintillation occurs when the GPS or SBAS satellite signal travels through small-scale irregularities in electron density in th...

Abstract This paper describes a novel approach for reducing the kinematic position and time errors on GPS receiver in low Earth orbit. For dual-frequency receivers, point solution are dominated by signal-in-space ranging errors, which introduce sharp discontinuities estimates when visibility changes. These may be calculated removed, greatly peaks of at expense introducing slowly varyin...

Compared with the Global Navigation Satellite System (GNSS), asynchronous pseudolite (PL) navigation system does not provide corrections for frequency deviation between PL signals. To realize precise positioning, a reference receiver is utilized to reduce effect of PLs via differential method using carrier phase measurements. However, there exists time user and receivers due their clocks. With ...