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Development of Advanced Precise Positioning System (APPS) for Automated Geodetic GPS Processing   

Development of Advanced Precise Positioning System (APPS) for Automated Geodetic GPS Processing   . ICHIKAWA Ryuichi and KOYAMA Yasuhiro Kashima Space Research Center, NICT Xiong MIN and KANZAKI Masayuki Nippon GPS Solution Corporation. Overview. Motivation APPS System Description

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Development of Advanced Precise Positioning System (APPS) for Automated Geodetic GPS Processing   

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  1. Development of Advanced Precise Positioning System (APPS) for Automated Geodetic GPS Processing    ICHIKAWA Ryuichi and KOYAMA Yasuhiro Kashima Space Research Center, NICT Xiong MIN and KANZAKI Masayuki Nippon GPS Solution Corporation

  2. Overview • Motivation • APPS System Description • APPS Processing Procedure • Examples of Processing Results • Concluding Remarks

  3. Motivation • millimeter positioning using GPS [Rocken and Johnson, 1999] • only geodetic specialist • multi-hour static data sets • dual-frequency GPS receiver • high quality GPS orbit • earth’s physical model • earth rotation parameters • atmospheric mapping function • earth tide (solid, ocean, and atmosphere) • highly sophisticated software • high level of data processing expertise • Easy to Use!! • Our purpose -> User can get highly accurate relative positions using just one GPS receiver without any geodetic understandings.

  4. Similar Online GPS Processing Services • AUSPOS • the Australian Surveying and Land Information Group (AUSLIG) Online GPS Processing System, Australia • http://www.ga.gov.au/geodesy/sgc/wwwgps/ • OPUS • the On-line Positioning User Service provided by the National Geodetic Survey (NGS), USA • http://www.ngs.noaa.gov/OPUS/

  5. Comparison with other services

  6. System Descriptions • APPS works with data collected anywhere on Earth • Server system • PC specification • Dual Xeon CPU (2.8GHz, 1MB L2 cache, 800MHz FSB) with 2GB DDR Memory • OS • Red Hat Enterprise Linux • GPS data processing software • Bernese Ver.4.2 [Hugentobler et al., 2001]

  7. Reference stations for user data processing using APPS • International GNSS Service (IGS) tracking station: more than 340 stations

  8. GEONET station Reference stations for user data processing using APPS (contd.) • GEONET • The Geographical Survey Institute (GSI) of Japan is operating the GPS earth observation network (GEONET) consisting of more than 1200 continuous GPS stations in Japan. • APPS processes the user data with the data at the three most closest stations automatically. • User can choose any IGS and GEONET stations as reference stations manually. IGS tracking station

  9. APPS processing procedure • GPS observation by user • To transfer GPS data to APPS server • by e-mail • user’s FTP server • by WEB site (under development) • User GPS data is processed by APPS. • To send back processed results to user • Processing of multiple data files is available.

  10. RINEX data Subject: FORM for APPS PROCESS Date: Wed, 5 Jul 2006 09:38:14 +0900 (JST) From: APPS <apps@ryuu.nict.go.jp> To: ****@XXX.XXX.XX ############################################## Hello, I'm automail service in APPS Thanks to have a contact with me! If you'd like to use this service, please notice the format below ############################################## ##### header part ##### To: apps@nict.go.jp Subject: PROCESS ##### body part ##### #APPS_BODY_START TIME_WIND 00:00:00 23:59:59 0 CUT-OFF 15 SAMPLING 120 PRODUCTS igs FIX_AVE FIXED COMPARE FTP-PATH ELEV-DEP COSZ MAP_FUNC DRY_NIELL EST_TRP LINEAR 8 1 OUT_FORM SNX TRO #APPS_BODY_END ##### attachment file ##### rinex file (????????.??o or ????????.??d) APPS Processing Procedure (contd.) Time Window 00:00:00-23:59:59 (default) multi-session is available ex. session 1 00:00UT - 03:00UT session 2 03:00UT - 06:00UT : : session 8 21:00UT - 24:00UT blank mail Elevation Cut Off Angle 15 degrees (default) • IGS products • Final orbit • (IGS,COD,EMR,ESA, • GFZ,IGS,JPL,MIT,NGS) • Rapid orbit • (IGR,COR) • Ultra rapid orbit • (IGU,COP) <User’s reply> > ##### body part ##### > #APPS_BODY_START > TIME_WIND 00:00:00 23:59:59 0 > CUT-OFF 10 > SAMPLING 120 > PRODUCTS igs > FIX_AVE > FIXED GUAM > COMPARE 0821 0001 0006 0029 > FTP-PATH > ELEV-DEP COSZ > MAP_FUNC DRY_NIELL > EST_TRP NO 24 1 > OUT_FORM SNX TRO TRP > #APPS_BODY_END reply APPS server at KSRC of NICT, Japan low elevation weighting COSZ or NO atmospheric mapping function NMF, Hopfield, and COSZ • tropospheric delay estimation • time interval • With/wo horizontal gradient

  11. Result Result from APPS within 15 minutes COORDINATE OUTPUT ----------------- SITE: 0053 EPOCH: START=06/04/09 00:00:00 END=06/04/16 23:59:59 TIME_WIND Lat. (deg.) Lon. (deg.) Height (m) +-------------------------------------+------------------+------------------+------------------+ 06/04/09 00:00:00 - 06/04/09 23:59:59 37.3823753837000 136.8891647626000 51.3813 06/04/10 00:00:00 - 06/04/10 23:59:59 37.3823754627000 136.8891646849000 51.3646 06/04/11 00:00:00 - 06/04/11 23:59:59 37.3823753016000 136.8891647045000 51.4061 06/04/12 00:00:00 - 06/04/12 23:59:59 37.3823753370000 136.8891646803000 51.3937 06/04/13 00:00:00 - 06/04/13 23:59:59 37.3823752764000 136.8891647522000 51.3967 06/04/14 00:00:00 - 06/04/14 23:59:59 37.3823752845000 136.8891647698000 51.3946 06/04/15 00:00:00 - 06/04/15 23:59:59 37.3823753343000 136.8891647068000 51.3929 06/04/16 00:00:00 - 06/04/16 23:59:59 37.3823752517000 136.8891647584000 51.4249 +-------------------------------------+------------------+------------------+------------------+ AVERAGE: 37.3823753289875 136.8891647274375 51.3944 RMS: 0.0000008259062 0.0000019073486 0.0163 SITE1: GUAM SITE2: 0001 TIME_WIND Slope (m) RES +-------------------------------------+---------------+-------- 06/04/09 00:00:00 - 06/04/09 23:59:59 3493567.1618 0.0030 06/04/10 00:00:00 - 06/04/10 23:59:59 3493567.1697 0.0109 06/04/11 00:00:00 - 06/04/11 23:59:59 3493567.1593 0.0005 06/04/12 00:00:00 - 06/04/12 23:59:59 3493567.1616 0.0028 06/04/13 00:00:00 - 06/04/13 23:59:59 3493567.1540 -0.0048 06/04/14 00:00:00 - 06/04/14 23:59:59 3493567.1549 -0.0040 06/04/15 00:00:00 - 06/04/15 23:59:59 3493567.1581 -0.0008 06/04/16 00:00:00 - 06/04/16 23:59:59 3493567.1513 -0.0076 +-------------------------------------+---------------+-------- AVERAGE: 3493567.1588 RMS: 0.0054 APPS server at KSRC, Japan

  12. User location Example of Processing Resultusing APPS • Reference station • GUAM, TSKB, USUD • Baseline Length • Ranging 50 - 3500km • 8 days data • Apr. 9 – Apr. 16, 2006 TSKB USUD GUAM

  13. Example of Processing Resultsusing APPS (contd.) TSKB - Mt. Fuji USUD - Mt. Fuji

  14. Example of Processing Resultsusing APPS (contd.)

  15. Example of Processing Resultsusing APPS (contd.) Wakkanai Wajima Hamamatsu GUAM

  16. Concluding Remarks • We have developed the APPS. • The prototype of the APPS is in beta test, meaning it is generally available to the researchers. • Please contact: richi@nict.go.jp or koyama@nict.go.jp • Repeatability • 1-12mm RMS in baseline length • 1-8mm RMS in horizontal • 1-25mm RMS in vertical • Estimation of Tropospheric parameters is available. Acknowledgement: We thank the RINEX GPS data used in this study are supplied by IGS and GEONET of GSI, Japan.

  17. Outlook • Processing software upgrade • Bernese Ver.4.2 -> Ver.5.0 • Precise Point Positioning (PPP) • Additional model implementation • Ocean Tide • NAO99b [Matsumoto et al., 2000] • Atmospheric Mapping Function based on the numerical weather model • ex. IMF [Niell, 2001], VMF [Boehm and Schuh, 2004] • Additional Output • Ionosphere information • total electron content (TEC) • Experiment using Satellite Internet link (under consideration)

  18. Communication Satellites for Asia-Pacific regions • Engineering Test Satellite VIII (ETS-VIII) • to be launched in 2006 • Mobile communications • Wideband Internetworking Engineering Test and Demonstration Satellite (WINDS) • to be launched in 2007 • 1.2 Gbps communication

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