Research On The Category Extraction And Interpolation Of The Regional Corrections In Cors System

Continuously Operating Reference System (CORS)-a newly GNSS technique, which generated in 1990s, is used as the Dynamic Coordinate Frame in one area. The Network Real-Time Kinematic positioning technology is the most important application in CORS system, while compared with Standard Real-Time Kinematic technology, it has the predominance of wide scope of operation, high accuracy and better steadily.Go with the speediness development of social and economy, the renewal circle of the geography information become shorter. With the ability to provide high accuracy coordinate data anywhere of the area, Network Real-Time Kinematic technique become the most important application in CORS systems. By now, the main CORS positioning techniques are Virtual Reference Station (VRS), Master-Auxiliary Concept (MAC), Flchen Korrektur Parameter(FKP) and Augmentation Reference Station (ARS).The purpose of this article is to improve the accuracy and steadily of CORS NRTK positioning, it includes the following contents:1. On the base of the research on each kind of CORS positioning techniques, the article expounds the positioning arithmetic theory and the positioning procedure of each technique, and discusses the merits and disadvantages of each technique. Base on the VRS observation equation, the article research on the remove and weaken the effects of the non-space-correlate errors, and both the classified distill and the Interpolation Method of space-correlate errors.2. The article studies the weaken methods of multipath effects and observation noise, and make research on the classified distill methods of satellites orbit error, troposphere delay error and ionosphere delay error. Studied the researches remove and weaken methods of each error, the article give proper methods for each delay error.3. Through the Studies of Interpolation Methods which can be used in CORS system, the article gives the proper interpolation method for each delay error.4. Using the real observation GPS data, the article employs the arithmetic, and analyses the results of positioning accuracy and steadily.On the base of studying the nowadays researches of improving positioning accuracy and steadily of Network Real-Time Kinematic, the article educe some valuable conclusions, which are valuable of the construction and application of Network Real-Time Kinematic system.