IMPACT OF USING THE NEW THIRD FREQUENCY ON GPS AMBIGUITY RESOLUTION

Document Type : Original Article

Authors

1 Engineer&Lecturer, Faculty of Engineering, Helwan University, El-Mataria, Cairo, Egypt

2 professor,Faculty of Engineering, Helwan University, El-Mataria, Cairo, Egypt

3 professor, Faculty of Engineering, Helwan University, El-Mataria, Cairo, Egypt

Abstract

 
The new GPS L5 signal, is a part of the U.S. efforts to modernize its global positioning system (GPS). It was designed to support safety of life applications such as civil aviation navigation. Its structure designed to provide higher performance in terms of measurement accuracy. Till now, the GPS system cannot transmit L5 from all satellites. So, in this paper a GPS simulator software in MATLAB environment was implemented to simulate RINEX observations files with the three frequencies. MATLAB: GPSDP (GPS Differential Processing) program was used to process static and kinematic data from all three frequencies .
RINEX files for both base and rover stations had been generated for different baselines lengths 5, 50 and 100 km approximately in different day times. These data are used to study the impact of the third frequency on rate of resolving integer ambiguities and the time needed to fix the integer ambiguities correctly. Also, the positioning accuracy after adding the third frequency to dual frequencies data. All parameters are studied under variation of ionosphere intensities.
The results of experiments have been illustrated and they show efficiency of using the third frequency over dual frequencies.

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