Prof. Wu Chen joined the Hong Kong Polytechnic University in 2000 and currently is a professor at Department of Land Surveying and Geoinformatics, Hong Kong Polytechnic University. He has been actively working on GNSS related research for over 30 years and has been working on a large number of research projects funded by universities, governments, and industries. His main research interests are Geodesy and Geodynamics, Seamless positioning technologies, indoor positioning, navigation and integrity, GNSS positioning and applications, system integration, GNSS performance evaluation, regional GPS network, wireless sensor network positioning, and Airborne Lidar applications. He has published over 300 technical papers in different journals and international conferences, submitted over 30 technical reports to various organizations, granted or filed more than 10 patents.

 Recent Research Projects

Project Title

Funding source

Funding amount

(HK dollar)

Monitoring and Modelling Local Ionosphere Using Regional GPS Networks



Monitoring Ocean Environment with GNSS



Analysis of Galileo Performance in Urban Environments



Mitigating Ionospheric Scintillation for GNSS Applications



Reliable Network RTK Techniques with Multiple GNSS Systems



Development of GNSS reflection signal processing algorithms for slope monitoring



Real-Time High Accuracy Positioning with Multiple GNSS Constellations

RGC (EC/RGC scheme)



Developing a Common Platform of a Software Based Receiver for Multiple GNSS Systems



Developing a GNSS platform to support urban applications



Development of a Hong Kong Positioning Infrastructure based on GPS, Beidou, and Ground based Augmentation System



Reflection Signal Processing Algorithms of Global Navigation Satellite System for Marine time and Land Incessant Remote Sensing



998,000 (Co-PI)

Development of a Hong Kong Indoor Positioning Infrastructure based on GPS Technologies


5,449,625 (Co-PI)

Seamless Navigation in Urban Environment through Multiple Sensor Fusion and GNSS Multipath Mitigation



Improved Positioning of Land Vehicle in ITS Using Digital Map and Other Accessory Information



Seamless Positioning and Tracking Systems for Construction Safety and Management




Airborne Lidar and Applications


RMB 1,000,000

Integrity monitoring for GNSS


RMB 400,000









Recent Journal Publications

1.      Lu M., W. Chen, X. Shen, H.C. Lam, J. Liu (2007), Positioning and Tracking Construction Vehicles in Highly Dense Urban Areas and Building Construction Sites, Automation in Construction, 16(5): 647-656

2.      Zhang L., F. Li, W. Chen (2007), Influence of Gravity Disturbance Resolution on GPS/Gravity Boundary Value Problem, Geomatics and Information Science of Wuhan University, 32(6): 523-526

3.      Lu M., F. Dai, W. Chen, (2007) Real-time decision support for planning concrete plant operations enabled by integrating vehicle-tracking technology, simulation and optimization algorithms, Canadian Journal of Civil Engineering, 34(8): 912-922

4.      Ji S., W. Chen, C. Zhao, X.L. Ding, Y.Q. Chen (2007) Single epoch ambiguity resolution for Galileo with the CAR and LAMBDA methods, GPS Solution, 11 (4): 259-268

5.      Chen W., S. Gao, C. Hu, Y.Q. Chen, X.L. Ding (2008) Effects of ionospheric disturbances on GPS observation in low latitude area, GPS Solution, 12 (1): 33-41

6.      Zhong P, X.L. Ding, D.W. Zheng, W. Chen, D. Huang (2008) Adaptive wavelet transform based on cross-validation method and its application to GPS multipath mitigation, GPS solution, 12(2): 109-117 

7.      Shen X., W. Chen and M. Lu (2008) Wireless Sensor Networks for Resources Tracking at Building Construction Sites, Tsinghua Science & Technology, 13(S1): 78-83

8.      Chen W., Z. Li, M. Yu, and Y.Q. Chen, (2008) An Integrated Map Match Algorithm with Position Feedback and Shape-based Mismatch Detection and Correction, Journal of Intelligent Transportation Systems, 12(4): 168 - 175

9.      Zhang L., F. Li, W. Chen, C. Zhang, (2009) Height datum unification between Shenzhen and Hong Kong using the solution of the linearized fix-gravimetric boundary value problem, J. of Geodesy, 83(5): 411-417

10.  Lu M., X. Shen; and W. Chen (2009) Automated Collection of Mixer Truck Operations Data in Highly Dense Urban Areas, ASCE Journal of Construction Engineering and Management, 135(1): 17-23 

11.  Chen W., C. Hu, S. Gao, Y.Q. Chen, and X.L. Ding (2009) Error Correction Models and Their Effects on GPS Precise Point Positioning, Survey Review, 41:238-252

12.  Yan H., W. Chen, Y. Zhu, W. Zhang, and M. Zhong (2009) Contributions of thermal expansion of monuments and nearby bedrock to observed GPS height changes, Geophysics Research Letters, 36: L13301

13.  Yuan L. G., X. L. Ding, P. Zhong, W. Chen, D. F. Huang (2009) Estimates of ocean tide loading displacements and its impact on position time series in Hong Kong using a dense continuous GPS network. Journal of Geodesy, 83(11):999-1015

14.  Yuan L.G., X.L. Ding, H.P. Sun, P. Zhong and W. Chen (2010) Determination of ocean tide loading displacements in Hong Kong using GPS technique, SCIENCE CHINA Earth Sciences, 53(7): 993-1007

15.  Shen X., M. Lu, and W. Chen (2010) Computing Three-Axis Orientations of a Tunnel Boring Machine through Surveying Observation Points, Journal of Computing in Civil Engineering 1:54

16.  Shen X., M. Lu, and W. Chen (2010) Tunnel Boring Machine Positioning during Microtunneling Operations through Integrating Automated Data Collection with Real Time Computing, Journal of Construction Engineering and Management 1:168

17.  Ji S., W Chen, X.L. Ding, Y.Q. Chen, C. Zhao and C. Hu (2010) Potential Benefits of GPS/GLONASS/GALILEO Integration in an Urban Canyon-Hong Kong, Journal of Navigation, 63: 681-69

18.  Ji S., W. Chen, X.L. Ding, Y.Q. Chen; C. Zhao, C. Hu, (2010) Ambiguity validation with combined ratio test and ellipsoidal integer aperture estimator, Journal of Geodesy, 84(10):597-604

19.  Yan H., W. Chen, Y. Zhu, W. Zhang, M. Zhong, G. Liu, (2010) Thermal effects on vertical displacement of GPS stations in China, Chinese Journal of Geophysics, 53(2): 252_260

20.  Ji, S., W. Chen, X. Ding, and C. Zhao (2011), Equatorial ionospheric zonal drift by monitoring local GPS reference networks, J. Geophys. Res., 116: A08310

21.  Ding Q., W. Chen, B. King, Y.Q. Chen, Y. Liu, H. Zhang, (2011) Coastal Wetland Investigations by Airborne LiDAR: A Case Study in the Yellow River Delta, China, Marine Technology Society Journal, 45(5): 59-70

22.   Xu, G., T. Xu, T.K. Yeh, W. Chen (2011) Analytical solution of a satellite orbit disturbed by lunar and solar gravitation, Monthly Notices of the Royal Astronomical Society, 410(1): 645-653

23.  Xu, G., T. Xu, W. Chen, T.K. Yeh (2011) Analytical solution of a satellite orbit disturbed by atmospheric drag, Monthly Notices of the Royal Astronomical Society
410(1): 654-662

24.  Chong Y., W. Chen, Z. Li, W.H.K. Lam (2011) Method for Preceding Vehicle Type Classification based on Sparse Representation". TRANSPORTATION RESEARCH RECORD: JOURNAL OF TRANSPORTATION RESEARCH BOARD, 2243: 74-80

25.   Iz B., Y. Q. Chen, C. K. Shum, X. L. Ding, B. A. King, W. Chen and M. Berber (2012) Assessing consistency of Chang’E-1 and SELENE reference frames using nearly-colocated laser altimetry footprint positions, Journal of Geodesy, 86(2): 109-117

26.  Chong Y., W. Chen, Z. Li, W. H. K. Lam, C. Zheng and Q. Li (2012) Integrated Real-Time Vision-Based Preceding Vehicle Detection in Urban Roads, Advanced Intelligent Computing, Lecture Notes in Computer Science, Volume 6838/2012: 270-275

27.  Prasanna I., W. Chen, (2012) Geoid modeling using a high resolution geopotential model and terrain data: A case study in Canadian Rockies, J. of Applied Geodesy, 6(2): 89-01

28.  Ji S., W. Chen, X. L. Ding, Y. Q. Chen, C. M. Zhao and C. W. Hu (2013) An improved cascading ambiguity resolution (car) method with Galileo multiple frequencies, survey review, 45(328): 51-58

29.  Kao S., Y. Tu, W. Chen, D. Weng, S. Ji (2013) Factors affecting the estimation of GPS receiver instrumental biases, Survey Review 45(328):59-67

30.  Kao S., Y. Tu, S. Ji, W. Chen, Z. Wang, D. Weng , X.L. Dingc T. Hu (2013) A 2-d ionospheric model for low latitude area – Hong Kong, Advances in Space Research 51(9): 1701-1708

31.  Ding Q., W. Chen, B. King, Y. Liu, G. Liu (2013) Combination of overlap-driven adjustment and Phong model for LiDAR intensity correction, ISPRS Journal of Photogrammetry and Remote Sensing 75:40-47

32.  Ji S., W. Chen, D. Weng, Z. Wang, X.L. Ding (2013) A study on cycle slip detection and correction in case of ionospheric scintillation, Advances in Space Research, 51(5): 742-753

33.  Liu Z., S. Ji; W. Chen; and X.L. Ding, (2013) New Fast Precise Kinematic Surveying Method Using a Single Dual-Frequency GPS Receiver, J. of Surveying Engineering (ASCE), 139(1): 19-33

34.  Prasanna I., W Chen, HB Iz, (2013) High resolution local Moho determination using gravity inversion: a case study in Sri Lanka, Journal of Asian Earth Sciences, 74(25):62-70

35.  Prasanna I. W Chen, D Gomez-Ortiz, (2014) Geophysical Investigation of Lithosphere Structure Beneath Sri Lanka Using Surface and Internal Load Variations. Pure and Applied Geophysics, 171(8): 1951-1962

36.  Ji S., Y. Xu, W. Chen, Z. Wang, D. Weng, B. Huang, S. Fan and G. Sun (2014) Comparison of standalone performance between COMPASS and GPS, Journal of Navigation, 67(1):37-48

37.  Weng D., S. Ji, W. Chen and Z. Liu (2014) Assessment and Mitigation of Ionospheric Disturbance Effects on GPS Accuracy and Integrity, Journal of Navigation, 67(3): 371-384

38.  Xue S., Y.X. Yang, Y. Dang, W. Chen (2014) Dynamic positioning configuration and its first-order optimization, J. of Geodesy, 88:127-143

39.  Chen Q., Y. Shen, X. Zhang, H. Hsu, and W. Chen (2014) Global Earth’s gravity field solution with GRACE orbit and range measurements using modified short arc approach, Acta Geodaetica et Geophysica 50(2): 173-185

40.  Ji, SY  ; X. Wang ; Y. Xu, Y  ; Z. Wang, W. Chen, H. Liu, (2014) First Preliminary Fast Static Ambiguity Resolution Results of Medium-Baseline with Triple-Frequency Beidou Wavebands, J. of Navigation, 67(6): 1109-1119

41.  Ji, S., D. Weng, Z. Wang, W. Chen, W. Chan (2014) Second-order ionospheric effect on PPP over Hong Kong, J. of Atm. and Solar-Terrestrial Physics, 119: 184-192

42.  Chen, Q., Y. Shen, X. Zhang, H. Hsu, W. Chen, X. Ju, and L. Lou (2015), Monthly gravity field models derived from GRACE Level 1B data using a modified short-arc approach, J. Geophys. Res. Solid Earth, 120(3):1804–1819

43.  Xu R., Z. Liu, W. Chen (2015) Improved FLL-assisted PLL with in-phase pre-filtering to mitigate amplitude scintillation effects, GPS Solution, 19(2): 263–276

44.  Weng D., S. Ji, W. Chen, Z. Li, Y. Xu, L. Ye (2015) Assessing and Mitigating the effects of the ionospheric variability on DGPS, GPS Solution, 19(1): 107–116

45.  Hung R., B. King and W. Chen (2015) Conceptual Issues Regarding the Development of Underground Railway Laser Scanning Systems, ISPRS Int. J. Geo-Inf., 4(1): 185-198

46.  Weng D., S. Ji, W. Chen, Z. Li, Y. Xu, L. Ye (2015) Assessing and mitigating the effects of the ionospheric variability on DGPS, GPS Solutions, 19(1): 107-116

47.  Xu R., W. Chen, Y. Xu and S. Ji (2015) A New Indoor Positioning System Architecture Using GPS Signals, Sensors 2015, 15, 10074-10087

48.  Chen Q., Y. Shen, W. Chen, X. Zhang, H. Hsu and X. Ju (2015) A modified acceleration-based monthly gravity field solution from GRACE data, Geophys. J. Int., 202: 1190–1206

49.  Ji S., W. Chen, D. Weng, Z. Wang (2015) Characteristics of equatorial plasma bubble zonal drift velocity and tilt based on Hong Kong GPS CORS network: From 2001 to 2012, J. Geophys. Res. Space Physics, 120: 7021–7029

50.  Xu R., Z. Liu and W. Chen (2015) Multi-PLL with two-stage fusion to mitigate ionospheric scintillation effects on GPS receivers, Radio Science, 50(7): 630–641

51.  Chen Q. Y. Shen, X. Zhang, W. Chen, H. Hsu (2015) Tongji-GRACE01: A GRACE-only static gravity field model recovered from GRACE Level-1B data using modified short arc approach, Advances in Space Research, 56(5): 941–951,

52.  Xu Y., S. Ji, W. Chen, D. Weng (2015) A new ionosphere-free ambiguity resolution method for long-range baseline with GNSS triple-frequency signals, Advances in Space Research, 56(8): 1600–1612

53.  Yan H., W. Chen, L.G. Yuan (2016) Crustal vertical deformation response to different spatial scale GRACE and GCMs surface loading, Geophys. J. Int., 204 (1): 505-516

54.  Wang Z., X. Wang, S. Ji and W. Chen (2016) Optimal cycle slip detection and correction with reliability, Survey Review, 48(349): 233-239

55.  ChenAffiliated withCollege of Surveying and Geo-Informatics, Tongji UniversityDepartment of Land Surveying and Geo-Informatics, Hong Kong Polytechnic UniversityCenter for Spatial Information Science and Sustainable Development Q. Y. Shen, W. Chen, X. Zhang, H. Hsu (2016) An improved GRACE monthly gravity field solution by modelling the non-conservative acceleration and attitude observation errors, J. of Geodesy, 90(6): 503-523

56.  Chen Q. Y. Shen, X. Zhang, W. Chen, H. Xu (2016) GRACE, Data-based High Accuracy Global Static Earth’s Gravity Field Model, Acta Geodaetica et Cartographica Sinica, 45(4):396-403

57.  Kumar S., W. Chen, Z. Liu, S. Ji (2016) Effects of solar and geomagnetic activity on the occurrence of equatorial plasma bubbles over Hong Kong, JGR Space Physics, 121(9): 9164–9178

58.  Tang S., Q. Zhu, W. Chen, M. Chen (2016) Enhanced RGB-D Mapping Method for Detailed 3D Indoor and Outdoor Modeling, Sensors 16(10):1589 

59.  Wang Z., X. Wang, S. Ji & W. Chen (2016) Optimal cycle slip detection and correction with reliability, Survey Review, 48:349: 233-239

60.  Qiao J., and W. Chen (2016) Improving BDS autonomous orbit determination performance using onboard accelerometers, Acta Geodaetica et Cartographica Sinica, 45(S2): 116-131

61.  Darwish W., S. Tang, W. Li, and W. Chen (2017) A New Calibration Method for Commercial RGB-D Sensors, Sensors 17(6): 1204

62.  Yang C., W. Shi, W. Chen (2017) Comparison of Unscented and Extended Kalman Filters with Application in Vehicle Navigation, Journal of Navigation, 70(2): 411-431

63.  Wu Y., Z. Luo, W. Chen and Y.Q. Chen (2017) High-resolution regional gravity field recovery from Poisson wavelets using heterogeneous observational techniques, Earth, Planets and Space, 69:34,

64.  Zheng Y., Y. Yang, and W. Chen (2017) A Novel Range Compression Algorithm for Resolution Enhancement in GNSS-SARs, Sensors 2017, 17(7), 1496

65.  Yu W., X.L. Ding, W. Dai, W. Chen (2017) Systematic error mitigation in multi-GNSS positioning based on semiparametric estimation, J Geod (2017). doi:10.1007/s00190-017-1038-6

66.  Xu R., W. Chen, Y. Xu, S. Ji, J. Liu (2017) Improved GNSS-based indoor positioning algorithm for mobile devices, GPS solution, 2017, DOI 10.1007/s10291-017-0647-0

67.  Kumar S., W. Chen, M. Chen, Z. Liu, R. P. Singh (2017), Thunderstorm/Lightning induced ionospheric perturbation: An observation from equatorial and low latitude stations around Hong Kong" Journal of Geophysical Research - Space Physics, DOI: 10.1002/2017JA023914