Gps And Class Gps Measurements For The Formation Constellation State Determined

The Global Positioning System (GPS) is one of the best ways in states determination for satellite formation constellation. However, in high orbit or deep space, GPS may not be reliable sufficiently to determine the states of formation constellation lacking of the GPS satellite that can be observed by formation constellation. Further more, it would be so difficult to resolve the integer ambiguity of carrier phase differential GPS (CDGPS) inter-satellite only using GPS measurement. So, in this paper, like-GPS, one of the measurement technologies between satellites, was introduced on the base of GPS measurement, and then applications of two kinds of measurements and their combination on states determination of formation constellation were discussed separately. Further more, a mathematical model of states determination of formation constellation was set up combining with GPS measurement and like-GPS measurement. Lastly, the result of simulation analysis was given.In order to solve the problem that like-GPS measurement of low orbit formation constellation can not work on for long time, a method of like-GPS antenna's setting was investigated. The attitude of like-GPS antenna and the viable time of like-GPS measurement were studied while like-GPS antenna was set in this method.According to the difference of carrier phase differential base-line, this paper has discussed the initialization of the ambiguity intra-satellite and inter-satellite separately. Based on the method of movement, the initialization of ambiguity intra-satellite was completed. With the centimeter length constraint to the kilometer baseline inter-satellite which supplied by high accurate like-GPS measurement, the ambiguity inter-satellite was initialized quickly using Bayes Least Square. Learning from the result of simulation analysis, the ambiguity intra-satellite could be initialized successfully within 300 seconds at 95% level with the maneuver of satellite attitude within a special range, and the ambiguity inter-satellite could be initialized successfully within 200 seconds at 90% level without any maneuver of satellite attitude. After the initialization of ambiguity was completed, the accuracy of relative positions between satellites is superior to 10^-2m and the accuracy of attitudes of satellite is superior to 10^-5rad.