Fuzzy processing on GPS data to improve positioning accuracy, before and after S/A is turned off
Conclusion
This paper has described how the positioning accuracy of a low cost GPS receiver can be greatly improved with a fuzzy system. Fuzzy logic was used to selection of appropriate data according to the measurement or available information. The result is a highly effective technique for accurate positioning. The validity of the proposed fuzzy system was confirmed by experimental results on implemented unit in this paper (Fig.5). So that position components deviation before turning off the S/A, were decreased from more than 215 to less than 50 meters after fuzzy processing. Similarly, the position components deviation were reduced to less than 10 meters after turning off the S/A, while it was about 55 meters before fuzzy processing.
Fig.5. Implemented unit in this paper
References
- Paul Zarchan, "Global Positioning System: Theory and Applications", Volume I, American Institute of Aeronautics and Astronautics, 1996.
- B.Hofmann-Wellenhof, H.Lichtenegger and J.Collins, "Global Positioning System: Theory and Practice", Third Revised Edition, Springer-Verlag Wien New York, April 1994.
- Timothy Barnes, "Selective Availability via the Levinson Predictor", ION GPS-95, September 1995, pp.533-542.
- Yi Bian, "GPS Signal Selective Availability Modeling and Simulation for FAA WAAS IV & V ", ION GPS-95, September 1995, pp.761-769.
- Sien-Chong Wu and William G. Melbourne, "An Optimal GPS Data Processing Technique for Precise Positioning", IEEE Transactions on Geoscience and Remote Sensing, Vol. 31, No. 1, Jan. 1993, pp.146-152.
- M.H.Refan and K.Mohammadi, "Point Averaging of the Position Components, before and after S/A IS Turned off ".
www.gisdevelopment.net/technology/gps/techgp0014. htm,2001
- "Microtracker LP Operations Manual", Rockwell International Corporation, GPS-16, January 10, 1994.
- "Microtracker LP Designer's Guide", Rockwell International Corporation, GPS-22, January 1, 1995.
- K.Mohammadi and M.R.Mosavi, "Improve the Position Accuracy on Low Cost GPS
Receiver with Neural Networks ", 2nd Iranian Conference of Satellite Based Positioning
System, Iran University of Science and Technology, October 2001, pp.166-173.
- Xian-Jun Gao and Yi-Song Dai Ke Wang, "A Study on the Self-Difference GPS Positioning by Dynamic and Fictitious Datum Station", IEEE Conference on Vehicle Electronics, Vol.1, 1999, pp.16-18.
- Chung- Jie Lin, Yung- Yaw Chen and Fan- Ren Chang, "Fuzzy Processing on GPS Data to Improve Position Accuracy", IEEE Symposium on Soft Computing Intelligent Systems and Information Processing, Asian, 1996, pp.557-562.
- M.R.Mosavi , K.Mohammadi and A. Ghalehnoee, "Improve the position Accuracy on Low Cost GPS Receiver with Fuzzy Logic" , The Third Iranian Seminar on Fuzzy Sets and Its Applications, University of Sistan and Baluchestan, June 2002, pp.171-179.
- Peter Pacini and Bart Kosko, "Adaptive Fuzzy Systems for Target Tracking", IEEE Journal on Intelligent Systems Engineering, Vol.1, NO.1, 1992, pp.3-21.
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