الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
 |  | from | 134 |  |  |
| | | from | 134 | | |
المستخلص
In this thesis, a comprehensive study has been carried out on GPS static positioning for control surveying work. The accuracy aspects and sources of error and biases have been emphasized. The classification of GPS errors has been presented in a way that will be of direct help to the GPS users. In the new presentation the errors and biases inherent in the measurement are classified according to the techniques that will remove or reduce them. They are introduced in a comprehensive tabular form from which the quality of observations taken with a certain ”measurement technique” can be easily and directly pinpointed.
This thesis presents the results of investigations to determine accurate position coordinates using the static Global Positioning System (GPS) in Precise Point Positioning (PPP) mode, when dual/single frequency receiver is used on a base station. Also, the improvement that could be achieved to these positions when using data/corrections downloaded from the internet lor differential GPS operation is investigated. With the aid of frcc-of-chargc internet products regular CiPS user can achieve cenlimeler level accuracy and ensure long-term reference frame stability. The internet is used in this research in four distinct aspects:
: i As in all research work nowadays, the internet is used to search and find related references
and research papers: and to download software to be used in the research. Also, to make
contact with others in matters concerning the research etc.
.1) To download data of chosen 1GS stations to be used in conjunction with observation data of ihe present research for differential correction. Also, to download information about each station’s geographical location coordinates, receiver type, antenna phase center and antenna
height.