The Study Of Integrated Positioning Algorithms Based On GPS/GLONASS

At present, the world’s satellite navigation systems includes: The Global PositioningSystem of America; The GLONASS system of Russia; The Chinese Compass system andThe Galileo of European. As the current existing satellite navigation system whosetechnology is relatively matures and independent, GPS and GLONASS both haveadvantages, but also their own shortcomings. But after GPS and GLONASS combined, theyovercome the shortage of the single system, and play the advantage of the combiningsystem more effectively. It has a brighter application future.The Galileo and thesecond-generation Compass satellite navigation which is all in construction will also beadded to the field of satellite navigation in the near future. The application combinations ofseveral satellite navigation systems will become an inevitable trend. Therefore, thecombination of satellite navigation and positioning has become a research-hotspot in recentyears. Strengthening the research of GPS/GLONASS positioning technology will have greatreference-value to the construction of the second-generation satellite navigation system andother combinational satellite navigation system.This paper studies and discusses severalrelated problems about the combination of GPS and GLONASS satellite positioning system.At first, this paper described the basic components and current status of the GPS andGLONASS satellite positioning system, compare the two systems and give the differencesof their respective advantages and disadvantages in positioning. On this basis, it analyzedboth the feasibility and advantages of the portfolio positioning system. The second,introduced two different time-systems of GPS and GLONASS, And through analysis andcomparison, give the conversion formula between the two time-systems. Meanwhile, wedeeply studied the basic methods and mathematical models of the conversion betweenWGS-84and PZ-90coordinate. It listed a variety of current methods on coordinatetransformation parameters which other countries use. Through the simulation experimentsand comparative analysis, came up with a more suitable method used in China. Andproposed a new method based on pseudo-range method of solving the coordinatetransformation parameters. At last, in this paper, we preliminary studied the combinationpositioning algorithm of GPS/GLONASS. Through the algorithm simulation experiments ofThe Maximum Tetrahedron Volume and The Largest Determinant Algorithm, we comparedthe result and came up with a better positioning algorithm of higher accuracy.