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《Science of Surveying and Mapping》 2005-02
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Recent progress in global navigation of satellite system

CHEN Jun-yong~①,DANG Ya-min~②(①State Bureau of Surveying & Mapping,Beijing 100830;②Chinese Academy of Surveying and Mapping,Beijing 100039)  
Global Navigation Satellite System 2004 Annual Symposium (ION GNSS 2004) was held in Long Beach CA,USA,Sept 21-24,by Institute of Navigation.The main topics in the GNSS 2004 are as follows.①Continuously operating reference stations (CORS).CORS is run by National Geodetic Survey (NGS),an office of National Oceanic and Atmospheric Administration (NOAA).CORS can provide GPS carrier phase and code range to the costumers in support of 3D positioning activities throughout the USA.CORS enables positioning accuracies that approach a few centimeters relative accuracy for a GPS baseline,both in horizontally and vertically.GPS user in USA may submit their static GPS data to NGS via the Web,and then the each summated data file will be processed with respect to three CORS sites,and the GPS user receives the computed position via email.Now there are more than 500 GPS CORS sites in USA.②Progress in GPS.GPSⅡR type satellite is better both in its shape and function.It reduces the errors obviously in its orbit position and the distance measurement.There are 9 GPS II R type satellites on the GPS orbit till Jan.01,2004.③Space based GPS wide area augmentation system (WAAS).The horizontal and vertical accuracies of the GPS positioning,by using of WAAS L1 and L2 band in USA,has reached 1~2m and 2~3m level respectively.④Reconstruction of GPS signal.A artificial or fictitious GPS signal system with high fidelity has been developed in USA.The fictitious signal radiation emission equipment can land base,space base or air base.GPS receiver can use the fictitious GPS signal to conduct precise positioning.⑤The preparation for Galileo system.The orbit height,constitution of signal and message,time frame and clock difference for Galileo system have been carefully studied again,and they are confirmed finally.Besides,the special attention has been paid on the joint operation with GPS system for satellite positioning customer.
【CateGory Index】: P228
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