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positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS

Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2290-2299页

作者： ZHOU ShanShi CAO YueLing ZHOU JianHua HU XiaoGong TANG ChengPan LIU Li GUO Rui HE Feng CHEN JunPing WU Bin Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Beijing Global lnformation Application and Development Center Beijing 100094China

Determined to become a new member of the well-established GNSS family,COMPASS(or BeiDou-2) is developing its capabilities to provide high accuracy positioning *** positioning modes are investigated in this study to assess the positioning accuracy of COMPASS' 4GEO/5IGSO/2MEO *** Point positioning(PPP) for geodetic users and real-time positioning for common navigation users are *** evaluate PPP accuracy,coordinate time series repeatability and discrepancies with GPS' precise positioning are *** show that COMPASS PPP repeatability for the east,north and up components of a receiver within China's Mainland is better than 2 cm,2 cm and 5 cm,*** systematic offsets of several centimeters exist between COMPASS precise positioning and GPS precise positioning,indicating errors remaining in the treatments of COMPASS measurement and dynamic models and reference frame differences existing between two *** common positioning users,COMPASS provides both open and authorized services with rapid differential corrections and integrity information available to authorized *** assessment shows that in open service positioning accuracy of dual-frequency and single-frequency users is about 5 m and 6 m(RMS),respectively,which may be improved to about 3 m and 4 m(RMS) with the addition of differential *** accurate Signal In Space User Ranging Error(SIS URE) and Geometric Dilution of Precision(GDOP) contribute to the relatively inferior accuracy of COMPASS as compared to *** the deployment of the remaining 1 GEO and 2 MEO is not able to significantly improve GDOP,the performance gap could only be overcome either by the use of differential corrections or improvement of the SIS URE,or both.

关键词： PPP real-time positioning authorized services orbit determination

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Research and Application of Indoor positioning Method Based on Fixed Infrared Beacon

Research and Application of Indoor Positioning Method Based ...

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第37届中国控制会议

作者： Wanye Yao Liqi Ma North China Electric Power University

Among various indoor positioning methods,WiFi,UWB,Zigbee,*** highly valued,but due to factors such as indoor building or self-stability,there are often problems such as inaccurate positioning coordinates and positional coordinate drift in practical *** order to improve indoor positioning accuracy and stability and solve the problem of excessive drift in measurement coordinate information,an indoor positioning method based on fixed infrared coordinates and a real-time location K-time grouping algorithm are *** method takes the infrared fixed beacon as the reference point,uses the camera on the car pan-tilt to measure the tag,and calculates the real-time positioning coordinate height according to the angle difference between the horizontal direction and the vertical direction after rotation and the height h of the fixed *** algorithm firstly classifies the car’s walking positioning model into K groups to eliminate floating before and after positioning;Secondly,the x-coordinate information and the y-coordinate information of the analysis trolley are respectively obtained by the system to measure the characteristic value γ=[γγ] of the two angle *** simulation verifies that this method can effectively deal with drift and outliers in positioning data.

关键词： Infrared Label Indoor positioning real-time positioning Data Processing K-time grouping Algorithm

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