经由过程实例提高GPS水准精度剖析(国外英文资料).docVIP

通过实例进行GPS水准精度分析(国外英文资料) The precision analysis of GPS is carried out by example In the practical application of engineering a selected number of leveling points, on these points for GPS observation, establish datum elevation fitting to the system, and to a certain point of elevation is the height, can say is a kind of independent vertical system, and in the traditional stand-alone leveling network, taking a monohydrate on time elevation is the height, or arbitrary assumption since a point elevation for elevation of the situation is similar. On practical, the height accuracy of GPS point in this system with GPS point the high precision of the earth, the same used some point encryption leveling elevation accuracy in addition to the affected by level elevation difference observation precision, is due to the influence of the geoid and the fitting surface difference. In order to set up the GPS leveling fitting mathematical model with geometric leveling, combined with the actual production, we in huo coal project control network measurement experiment of GPS height fitting made, also on multiple highway measurement verification and comparison, has achieved a certain amount of data and reliable experiment results. First, the project control network for the project control network For D network, the network is cut in setting 84 points, study all the fourth level, zonal distribution along pipeline, the west and low in east-west terrain, elevation difference between the eastern and the maximum is about 52 m, 0.49 m height anomaly changes in, in order to explore establishing GPS measurement results and the mathematical model of geometric leveling fitting, respectively, for the plane fitting and quadratic curve fitting schemes are compared and the fitting are shown in table 1. Table 1 From table 1 shows that when the plane fitting method is used, whether meet the measuring accuracy and fitting precision leveling point about how, when involved in fitting level reaches a certain