Performance Evaluation Of Real Time Precise Point Positioning (RT-PPP) In Static & Kinematic Modes In Egypt

Transcription

1 Performance Evaluation Of Real Time Precise Point Positioning (RT-PPP) In Static & Kinematic Modes In Egypt Eng. Ahmed Mansour Abdallah Dr. Mahmoud Abd Rabbou Prof. Adel El.shazly Geomatic Branch, Civil Engineering Department, Cairo University Melaha conference, 25 April 2016 Presented by: Eng. Ahmed Mansour

2 OUTLINE Introduction Problem statement Mathematical models Methodology Results and analysis Conclusion Melaha conference, 25 April

3 INTRODUCTION For obtaining a precise position solution in real time, There are two sets of techniques that are available: 1- The common techniques are differential GPS positioning and (RTK) DGPS positioning is used for precise real time positioning and navigation applications. The accuracy of Using This technique achieved better than centimeter. 2- Real Time Precise Point Positioning (RT-PPP) After the appearance of the real time precise products, RT-PPP can become a good alternative as a precise real time positioning for the precise applications Melaha conference, 25 April

4 INTRODUCTION 1- Differential GPS positioning and (RTK) systems Requirements 1. GNSS Receiver on a station whose position is known exactly as a base station and another one on a rover station. 2. RTk requires a radio frequency link between a base station and the rover. 2- Real time PPP system Requirements 1. Only one GNSS receiver on a rover station whose position is unknown. 2. Precise Product (satellite orbit and clock correction) in real time. Melaha conference, 25 April

5 INTRODUCTION To determine the satellite position, There are two sets of data that are available: 1. Broadcast ephemerides (transmitted by the satellites) 2. Precise ephemerides (available from several agencies, such as the International GNSS Service (IGS) According to IGS products description IGS Product Availability Product Final Rapid Ultra-Rapid Realtime Min latency 12 day 17 hrs. 90 min. 0 sec. Melaha conference, 25 April

6 INTRODUCTION Real-time (RTS) products RTS is based on the IGS global network stations, data centers, and analysis centers. Eight analysis centers currently participating in the RTS. A Continuous streams consist of combination solutions generated by processing individual solutions from Real Time Analysis Centers. RTS products are available through several distribution centers around the world as the BKG, The only requirement is user registration. RTS Streams Description Type IGS01, IGC01 IGS02 IGS03 Description - a single-epoch combination solution - Because of no filters are applied, all epochs are independent of each other. - This is a Kalman filter combination solution - The mean satellite position is computed from all AC - same approach as IGS02 - but it also includes GLONASS corrections - offered as an experimental product Orbit reference point APC, CM APC APC Melaha conference, 25 April

7 PROBLEM STATEMENT 1- the common technique that is used heavily till now have some disadvantages as Expensive system required. The need for base station which limited the range area. Finally the common link problems in RTK systems and restrictions. 2- the performance of the Real time PPP is not heavily investigated and evaluated globally till now. And the performance of the new technology is not investigated for Egypt region. Melaha conference, 25 April

8 MATHEMATICAL MODELS Melaha conference, 25 April

9 METHODOLOGY An Open Source multi-stream client program (BNC) version Data is used for data processing (BNC) designed for a variety of real-time GNSS applications provided by Federal Agency for Cartography and Geodesy. Real Time correction product stream IGS03 was registered For processing as RT-PPP. One of IGS stations (FFMJ) was selected to investigate the accuracy of this technique. Melaha conference, 25 April

10 METHODOLOGY Data in Egypt 1- Two stations are processed in static mode (FA, MA) 2- Kinematic data from GNSS receiver on moving railway car Position and distribution of selected Static Stations in Egypt Railway Track Melaha conference, 25 April

11 RESULTS AND ANALYSIS static Station in Egypt (FA) Final Real time (m) dx dy dz dx dy dz max min mean Melaha conference, 25 April

12 RESULTS AND ANALYSIS static Station in Egypt (MA) Final Real time (m) dx dy dz dx dy dz max min mean Melaha conference, 25 April

13 RESULTS AND ANALYSIS Kinematic Data in Egypt (Railway) Static Part Kinematic Part Static Part Kinematic Part Real time Ultra-rapid (m) dx dy dz dx dy dz max min mean Static Part Kinematic Part Melaha conference, 25 April

14 RESULTS AND ANALYSIS For IGS Station (FFMJ) Final Real time (m) dx dy dz dx dy dz max min mean Melaha conference, 25 April

15 CONCLUSION By using only one Dual GNSS receiver connected to one of product caster to download IGS real time stream as (IGS03), we can obtaining precise positioning solution at real time or at no latency Performance comparison of IGS RTS and ultra-rapid products The study investigated the possibility of using real-time IGS services in precise GNSS positioning in EGYPT The performance of Real time PPP in static and kinematic mode reach decimeter level accuracy. The results of tests presented PPP using IGS-RTS corrections for use in the surveying work requiring decimeter level accuracy and GNSS measurements in areas where there are lack of continuously operating reference stations (CORS) Melaha conference, 25 April

16 Thanks you Melaha conference, 25 April