GNSS Analysis Center at Shanghai Astronomical Observatory (SHAO)

• "The BDS-2 SISRE Refinement(北斗二号空间信号精度提升) " , a project hosted by Professor Junping Chen, was honored with GNSS positioning and navigation technology excellent  award. Detailed news please reference to:  www.shao.ac.cn/xwzx/ttxw/201809/t20180906_5065173.html.
  
  
• 7.25, Professor Junping Chen attended the 42nd COSPAR Scientific Assembly, held in Passadena USA, and gave an oral presentation ,"An approach for parameter decorrelation in precise dynamic orbit determination".
  
  
• 7.14-7.15,Group members Professor Junping Chen,Dr Bin Wang ,Ph.D students  AHao Wang and Lingdong Meng attended the "2018 CPGPS Forum", which is sponsored by the International Association of Chinese Professionals in Global Positioning Systems(CPGPS) and is organized by Chang'an University in the city of Xi'an China. Junping Chen gave an invited presentation " Data Processing Strategies on the Transition from BDS-2 to BDS-3". Bin Wang and Ahao Wang gave oral presentations respectively while Lingdong Meng posted a poster.
  
  
• 6.25-6.29, Dr Bin Wang attended the 2018 European Frequency and Time Seminar, held in Besancon ,France, at Femto-st institute.
  
  
• 5.27,Group member Xiuqiang Gong successfully has his doctoral thesis defense.
  "Research On the Accaracy Improvement Of BDS Broadcast Ephemeris and Clock Offset Model(北斗广播星历与钟差模型精度提升方法研究)"
  
  
• 5.23-5.25,Group members Professor Junping Chen, Dr. Xiuqiang Gong, Dr Bin Wang ,Ph.D students Qian Chen  AHao Wang and Lingdong Meng and master student Yangfei Hou attended the international conference of China Satellite Navigation Conference(CSNC) 2018,in the city of Haer Bin. Junping Chen gave an invited talk on the status of BDS-2/BDS-3 desired integrated services. Other group members gave 4 oral presentations. Yangfei Hou was awarded the "Best Youth Paper". 
  "Analysis of BDS Satellite Clock in Orbit with ODTS and TWTT Satellite Clock Data(EI)",by Bin Wang.
  "Analysis of BDS Satellite Clock Prediction Contribution to Rapid Orbit Recovery(EI)",by Qian Chen.
  "The Service Improvement of BDS Positioning Based on Advanced Equivalent Satellite Clock Calculation(EI&Best Youth  Paper)",by  Yangfei Hou.
  "Real-Time Detection and Repair of Cycle-Slip Based on Pseudo-range Phase Combinations for Un-differenced GNSS Triple-Frequency Observations(EI)",by Lingdong Meng.
  
  
• 4.21-4.22,Professor Junping Chen attended The China Electronic Information Technology Conference,in the city of Su Zhou, and gave an invited talk on LEO/GNSS integrated navigation technology.
  
  
• 4.10-4.12,Dr Bin Wang attended the 32nd European Frequency and Time Forum,  held in Torino, Italy, and posted a poster.
  "Kalman filter simulation and characterization of BDS satellite clock" ,by Bin Wang.
  
  
• 3.27,Group member Yu Yan successfully has his thesis defense.
  "Characteristics of Precise Clock and Precise Orbit Deviation between IGS and Analysis Centers(分析中心精密钟差及轨道数据与IGS最终产品间的特性)"

2017

• October 2017 ,AHao Wang (王阿昊) joined the Forum of Ph.D students hold in the university of Henan Polytechnic and was honored with excellent report award.

• 8.15-8.18 2017 Professor Junping Chen join the international conference of Asia Pacific Space Geodynamics(APSG) and  host the session on Geodynamics.

• 8.6-811 2017 Professor Junping Chen with Dr Weijing Qu  Dr Xiuqiang Gong   Dr Yueling Cao and Ph.D students Qian Chen attend  the international conference of Asia Oceania Geosciences Society(AOGS) hold in Singapore. Professor Chen host the session "Challenges in precise geodetic data analysis and applications". Others give oral presentations.

• 7.3-7.7 2017 Professor Junping Chen attends IGS workshop held at the University Paris-Diderot in Paris.

• 5.23-5.25 2017, Group members attend the CSNC conference and give two invited presentations, 4 oral presentations and 2 poster presentations.
  "BDS Code Bias and Its Effect on Wide Area Differential Service Performance" by Sainan YANG
  "Initial Assessment of BDS Zone Correction" by Yize ZHANG
  "Precision Analysis of CNAV Broadcast Ephemeris and Its Impact on the User Positioning", by Ahao WANG
  "Realization of BDS Single-Frequency Point Positioning of Sub-Meter Accuracy"
, by Heng WANG

• May 2017, Group members Sainan Yang, Yifan Hu, Heng Wang successfully have their thesis defense.
Ms. Sainan Yang (杨赛男) Thesis:"Research on BDS Decimeter Level SBAS and Its Performance Assesment(北斗分米级增强系统关键技术研究及精度评估)"
Mr. Yifan Hu (胡一帆)Thesis:"The calibration of antenna PCO\PCV based on navigation satellite orbit(卫星导航天线PCO和PCV在轨标定)"
Mr. Heng Wang (王恒)Thesis:"Realization of User Program with BDS Decimeter-level Wide-area SBAS(北斗分米级广域差分增强系统用户端算法研究与实现)"

• 4.30-5.6 2017, Junping attended the ION pacific conference and gave two oral presentations on BDS SIS improvement and the latest GNSS results of the CMONOC network."Recent Results of the Chinese CMONOC GNSS Network"

2016

2014

• December 27, 2014: Mid-term reports of the 863 project "Research on key issues for the performance improvement of Beidou Satellite Navigation System (BDS) 北斗空间信号精度提升关键技术 "  were compiled and evaluated by project evaluation boards.

• September, 2014: Meng Chen (陈猛) Joins GGDAA group .

• September, 2014: Bingbing Duan (段兵兵) leaves for Munich, Germany, and begins new adventure at the Technique University of Munich.

• August, 2014: Qian Chen (陈倩) Joins GGDAA group .

• July, 2014:  Zefeng Zhang  (张泽锋) and Yifan Hu (胡一帆) join GGDAA.  

• June 2014, Junping attends the IGS Workshop at Passadena and the ICG Group D meeting.

• April 2014, Proposal "Decimeter satellite-based wide area augmentation system of Beidou Satellite Navigation System (BDS)"  (分米级相位增强信号播发系统技术) is supported by  the National High Technology Research and Development Program of China (国家高技术研究发展计划,863计划)

• March 2014, Yibing Xie (谢益炳) successfully pass the defense of Maser thesis on "GNSS ionospheric model construction and hardware delay analysis" (GNSS 电离层建模及硬件延迟分析)

• March 2014, Wei Yu (余伟) successfully pass the defense of Maser thesis on "High Precision Positioning Research for Single Frequency Receiver" (GNSS单频接收机高精度定位研究)

2013

• Dec. 2013: Decimeter wide area real-time positioning results using compass (BDS) data are avialable  [COMPASS Wide area augmentation accuracy], Where new design of Augmentation messages, processing scheme and user positioning algorithm are developed.

• Oct. 2013:  Centimeter Precise Point Positioning (PPP) results using compass (BDS) data and precise products are avialable  [COMPASS PPP Repeatability]

• September, 2013:   BingBing Duan  (段兵兵) joins GGDAA.

• August 30 - September 7, 2013:  Junping Chen attend IAG scientific assembly.   

• July, 2013:  Junping Chen was supported by the "Pujiang Scholar" (浦江人才) Project. (Project: GNSS应用于自然灾害预警与监测的关键问题研
  究) 

• June, 2013: Mao Li  (李茂) joins GGDAA.

• May, 2013: Junping Chen, Yize Zhang, Wei Yu, Yibing Xie and Sainan Yang attend the CSNC 2013 conference and contribute 3 oral presentations and 2 posters.  Junping Chen wins the 'outstanding paper' award (GPS/GLONASS System Bias Estimation and Application in GPS/GLONASS Combined Positioning) .

• March, 2013: Jungang Wang (王君刚) joins GGDAA.

• March 2013, Mrs Xiao Pei (裴霄) successfully pass the defense of Maser thesis on "GPS/GLONASS Combined Positioning" (GPS/GLONASS 组合定位)

• March 2013, Proposal "Research on key issues for the performance improvement of Beidou Satellite Navigation System (BDS)" (北斗空间信号精度提升关键技术) is supported by  the National High Technology Research and Development Program of China (国家高技术研究发展计划,863计划)

2012

• September, 2012: Sainan Yang (杨赛男) joins GGDAA.

• September 23-25,2012: Junping Chen and Yibing Xie attend the first general conference of the GLAC.

• August 2012, Proposal "Integrated spatial and temporal frames for Multi-GNSS data analysis" (多卫星导航系统时空基准的统一) is supported by the NSFC program.

• August 13-17,2012: Bin Wu, Junping Chen and Xiuqiang Gong attend the AOGS2012 conference in Singapore and gave 1 invited presentations on CMONOC network status, and other 3 oral presentation on the status of GNSS data analysis center of SHAO and the co-location results of the CMONOC network.

• July 22-27,2012: Junping Chen participated the IGS Workshop 2012 in Olsztyn, Poland gave 1 invited presentations on GNSS bias results. 

• May 14-18,2012: Junping Chen, Haojun Li, Xiao Pei & Yize Zhang participated the 3rd China Satellite Navigation Conference (CSNC) and gave 2 presentations (Chen et al; Pei et al).

• January,2012: Wei Yu and Yibing Xie join GGDAA.

2011

• Nov. 16-24,2011: GGDAA welcomes Dr. Shenyuan Zhu from GFZ Germany. Many topics are discussed, including GGOS activities and GNSS data analysis and applications. 

• Nov. 09-11,2011: Junping Chen attended the supervisor training program of CAS in Fuzhou, Fujian Province.

• Oct. 31,2011:  Beginning of the combined GNSS data analysis using ~100 IGS and ~210 CMONOC stations.

• Oct. 20,2011:  Release of the web of GGDAA and beginning of the http service of SHA products (sp3 orbits and Rinex clocks).

• August 8-12,2011: Junping Chen attend the AOGS2011 conference in Taipei and give two talks.

• August,2011: Xiao Pei and Yize Zhang join GGDAA.

• June. 15,2011: Beginning of the combined daily GNSS data analysis using ~100 GPS+GLONASS stations.

   31 November 2012, originator J.Chen                                                                              (return home)