Global positioning systems meteorology over Morocco: accuracy assessment and comparison of zenith tropospheric delay from global positioning systems and radiosondes

Global Positioning Systems –

Definition Global Positioning System a.k.a. GPS is a navigational system involving satellites and computers that can determine location (latitude, longitude and altitude) of any point on Earth. The satellite transmits signals which are received on earth by relatively inexpensive receiving device. By calculating the distance between four or more satellites and a receiver, a three-dimensional pos...

An improved global zenith tropospheric delay model

Comparison of Global Positioning System and Water Vapor Radiometer Wet Tropospheric Delay Estimates

Comparison of simultaneous Global Positioning System (GPS) and water vapor radiometer (WVR) measurements at Goldstone over 82 days in the period between June 25 and October 6, 1996, shows agreement in zenith wet path-delay estimates to <6 mm rms. The level of agreement is consistent with the expected levels of GPS and WVR errors. This method shows considerable promise for improving the accuracy...

Tropospheric Zenith Delay Prediction Accuracy for Airborne GPS High-Precision Positioning

When traversing the earth’s neutral atmosphere, GPS radio signals are affected significantly by the variability of its refractive index, which causes primarily a delay, usually referred to in the literature as the tropospheric delay. An inaccurate modeling of this delay results in degradation of position estimates, affecting mainly the height component. The tropospheric delay is commonly divide...

Integrated Global Positioning Systems ( Gps ) Laboratory

The purpose of this research is to develop a user-friendly Integrated GPS lab manual. This manual will help range engineers at NASA to integrate the use of GPS Simulators, GPS receivers, computers, MATLAB software, FUGAWI software and SATELLITE TOOL KTT software. The lab manual will be used in an effort to help NASA engineers predict GPS Coverage of planned operations and analyze GPS coverage o...