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Graduate Exam Abstract


Manuel Vega

Ph.D. Final

December 5, 2016, 12:00 pm - 3:00 pm

LSC #322

Multi-frequency Dual-polarized Platform for Validation of Satellite Precipitation Measurements


Abstract: Satellite missions such as the Tropical Rainfall Measuring Mission (TRMM) and the Global Precipitation Measurement (GPM) mission have demonstrated the value of rainfall measurements at a global scale. Both missions use a multi-frequency, active/passive (i.e. radar/radiometer) suite of instruments to achieve their measurement goals. Calibration and validation of these instruments has a vital role in the success of the mission since quantitative characterization of precipitation is the primary goal. Furthermore, these missions have also extended the understanding of the synergy between radar/radiometer observations within the atmospheric science community. From a ground validation (GV) perspective, active/passive observations are typically achieved with co-located, but independent instruments. In some cases, this has introduced radio frequency interference (RFI) between adjacent active/passive frequencies of operation, asynchronous scanning strategies and unmatched observation volumes. The work presented focuses on the following topics: 1) engineering aspects in the design of an active/passive remote sensing platform, 2) the design of a solid-state, dual-polarized, multi-frequency, Doppler radar system and performance characterization and 3) calibration approach for a ground based, multi-frequency, radar/radiometer system and first observations in this mode of operation.

Adviser: Prof. V. Chandrasekar
Co-Adviser: N/A
Non-ECE Member: Prof. Paul Mielke
Member 3: Prog. Anura Jayasumana
Addional Members: Prof. Margaret Cheney

Publications:
M. Vega and V. Chandrasekar, “Towards a Radar/Radiometer Mode on the Dual-frequency, Dual-polarized Doppler Radar (D3R) System,” in 14th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad), 2016.

R. M. Beauchamp, V. Chandrasekar, H. Chen, and M. Vega, “Overview of the D3R Observations during the IFloodS Field Experiment with Emphasis on Rainfall Mapping and Microphysics,” J. Hydrometeorol., vol. 16, no. 5, pp. 2118–2132, 2015.

R. M. Beauchamp, V. Chandrasekar, and M. Vega, “NASA D3R Linear Depolarization Ratio Observations and a New Estimation Technique,” in Geoscience and Remote Sensing Symposium (IGARSS), 2015, pp. 894–897.

M. A. Vega, V. Chandrasekar, J. Carswell, R. M. Beauchamp, M. R. Schwaller, and C. Nguyen, “Salient Features of the Dual-frequency, Dual-polarized, Doppler Radar for Remote Sensing of Precipitation,” Radio Sci., vol. 49, no. May, pp. 1–19, 2014.

V. Chandrasekar, H. Chen, R. M. Beauchamp, M. Vega, M. Schwaller, W. Petersen, D. Wolff, and D. Willie, “Deployment and Performance of the NASA D3R during GPM IFloodS Field Campaign,” in International Geoscience and Remote Sensing Symposium (IGARSS), 2014, pp. 4970–4973.

V. Chandrasekar, R. M. Beauchamp, M. Vega, H. Chen, M. Schwaller, W. Petersen, and D. Wolff, “Overview of the NASA D3R’s Performance During the IFloodS and IPHEX GV Field Campaigns - Preliminary Results,” in European Conference on Radar in Meteorology and Hydrology, 2014.

M. A. Vega, V. Chandrasekar, C. Nguyen, K. V. Mishra, and J. Carswell, “Calibration of the NASA Dual-Frequency, Dual-polarized, Doppler Radar,” in Geoscience and Remote Sensing Symposium (IGARSS), 2012, vol. 2, no. 1, pp. 4625–4628.

K. V. Mishra, V. Chandrasekar, C. Nguyen, and M. Vega, “The Signal Processor System for The NASA Dual-frequency Dual-polarized Doppler Radar,” in Proceedings of the IEEE IGARSS’12, 2012, pp. 4774–4777.

V. Chandrasekar, M. Schwaller, M. Vega, J. Carswell, K. V. Mishra, A. Steinberg, C. Nguyen, M. Le, J. Hardin, F. Junyent, and J. George, “Dual-frequency dual-polarized Doppler Radar (D3R) system for GPM Ground Validation: Update and Recent Field Observations,” in International Geoscience and Remote Sensing Symposium (IGARSS), 2012, pp. 346–349.

P. Saavedra-Garfias, M. Vega, A. Battaglia, C. Simmer, and V. Chandrasekar, “Toward a combined retrieval scheme from the microwave radiometer ADMIRARI and the dual-pol multi- wavelength radar D3R,” in 9th International Symposium on Tropospheric Profiling (ISTP), 2012.

M. Vega, K. V. Mishra, V. Chandrasekar, M. Schwaller, J. Carswell, C. Nguyen, and J. Hardin, “Performance Characteristics of the NASA Dual-frequency Dual-polarized Doppler Radar (D3R),” in International Geoscience and Remote Sensing Symposium (IGARSS), 2011.

M. A. Vega, J. Carswell, V. Chandrasekar, M. Schwaller, and K. V. Mishra, “Realization of the NASA Dual-Frequency Dual-polarized Doppler Radar ( D3R ),” in IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2010, pp. 4815–4818.

V. Chandrasekar, M. Schwaller, M. Vega, J. Carswell, and K. V. Mishra, “Scientific and Engineering Overview of the NASA Dual-frequency Dual-polarized Doppler Radar (D3R) System for GPM Ground Validation,” in International Geoscience and Remote Sensing Symposium (IGARSS), 2010, pp. 1308–1311.

V. Chandrasekar, M. Schwaller, M. Vega, J. Carswell, K. V. Mishra, C. Nguyen, L. Sanghun, M. Le, R. Meneghini, and W. Petersen, “The NASA Dual-Frequency Dual-Polarized Doppler Radar (D3R) System for GPM Ground Validation,” in European Geosciences Union General Assembly, 2010.


Program of Study:
ECE742
ECE752
ECE641
ECE514
ECE512
ECE799
ECE795
N/A