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Graduate Exam Abstract


Jun Wang

Ph.D. Final

July 24, 2017, 10:00 am - 12:00 pm

ECE conference room C101 B

SPACED-RECEIVER TECHNIQUE FOR IONOSPHERIC IRREGULARITY DRIFT VELOCITY AND HEIGHT ESTIMATION BASED ON HIGH-LATITUDE GNSS SCINTILLATION


Abstract: The conventional spaced-receiver approach uses amplitude scintillations to estimate equatorial ionospheric irregularity drift velocities. This approach is less applicable at high latitudes where there is a lack of substantial amplitude scintillations. This dissertation presents a method to estimate ionosphere irregularity horizontal drift velocities based on GNSS signal carrier phase measurements. After applying an adaptive periodogram technique, cross correlation in the time-frequency domain produces time lag information of propagating radio signals through the same ionospheric structure. Three velocity models are implemented to target specific irregularity shapes, including the point velocity model, the front velocity model, and the anisotropy model. The irregularity height can also be inferred from the anisotropy model. The time lag information are combined these parameters to infer ionospheric irregularity horizontal drift velocity. This dissertation presents the methodology and demonstrates its feasibility using data collected by a GNSS receiver- array at Gakona, Alaska, and a more recent establishment at Fairbanks, Alaska with other in-situ ionosphere monitoring instruments such as an all- sky imager and an incoherent scatter radar.

Adviser: Yu (Jade) Morton
Co-Adviser: N/A
Non-ECE Member: Olivier Pinaud, Math
Member 3: J. Rockey Luo, ECE
Addional Members: Charles Rino, ECE

Publications:
Wang, J., Morton, Y., Spaleta, J..& Bristow W (2014)., Spatial Characterization of High Latitude Ionosphere Scintillation Using An Array of Software Receiver Measurements Proc. ION GNSS+ 2014, Tampa, FL.
Wang, J., & Morton, Y. T. (2015). High-Latitude Ionospheric Irregularity Drift Velocity Estimation Using Spaced GPS Receiver Carrier Phase Time–Frequency Analysis. IEEE Transactions on Geoscience and Remote Sensing, 53(11), 6099-6113.
Wang, J., Morton, Y., Spaleta, J..& Bristow W (2016). A Comparative Study of Ionospheric Irregularity Drift Velocity using a GNSS Receiver Array and SuperDARN at High Latitude. Proc. ION ITM 2016, Monterey, CA.
Wang, J., & Morton, Y. T. (2017a) A Comparative Study of Time Domain and Joint Time-Frequency Domain Methods for Ionospheric Irregularity Drift Velocity Estimation from a GNSS Receiver Array during High Latitude Ionospheric Scintillation,” IES2017, Alexandria, VA, 2017
Wang, J., & Morton, Y. T. (2017b). A Comparative Study of Ionospheric Irregularity Drift Velocity Derived from a GNSS Receiver Array and PFISR Measurements during High Latitude Ionospheric Scintillation. J. Geophys. Res. Space Physics, 122, 2017. doi:10.1002/3028JA024015.


Program of Study:
ECE514
ECE581A4
ECE581A6
ECE651
ECE795
ECE799
MATH618
GSTR600