Graduate Exam Abstract
Mohit Kumar
Ph.D. Preliminary
July 17, 2019, 1:30 pm - 4:30 pm
Lory Student Center 372
ENHANCEMENTS TO NASA D3R WEATHER RADAR WITH FOCUS ON SECOND TRIP SUPPRESSION SCHEMES
Abstract: The NASA dual-frequency, dual-
polarization, Doppler radar (D3R) is an
important ground validation
tool for the global precipitation
measurement (GPM) missions dual-
frequency precipitation
radar (DPR). The D3R has undergone
extensive field trials starting in 2011
and continues to provide
observations that enhance our
scientific knowledge. To further
enhance its capabilities, the
digital receiver and waveform
generation subsystems are being
upgraded. Due to the new, more
flexible architecture, this upgrade
enables more research frontiers to be
explored with enhanced
performance. One of the primary
motivations for this upgrade is to
enable enhanced radar sensitivity
and increase range resolution to 30
meters.Because of the upgrade and
more flexible architecture, this thesis
also dwells upon the design
and implementation of Intra-pulse
polyphase codes for a weather Radar
system and D3R in particular.
Algorithms to generate codes with
good correlation properties are
discussed. Thereafter,
a new design framework is described,
which optimizes the polyphase code
and corresponding
mis-matched filter, using a cost/error
function. It establishes the
performance of these intra-pulse
techniques with application of second
trip removal. Additionally, this thesis
develops the use of Inter-pulse
frequency diversity scheme for a
weather
Radar system. It establishes the
performance of frequency diversity
technique comparing it with
other inter-pulse schemes. Inter-pulse
coding is widely used for second trip
suppression or crosspolarization
isolation. Here, a new inter-pulse
scheme is discussed taking advantage
of frequency diverse waveforms. The
simulations and test of performance, is
done on D3R.
Adviser: Prof. V. Chandrasekar
Co-Adviser: N/A
Non-ECE Member: Prof. Susan James
Member 3: Prof. Anura P. Jayasumana
Addional Members: Dr Margaret Cheney
Publications:
1) Performance trade-offs and upgrade of NASA D3R weather radar in 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS).
2) Nasa D3R: 2.0, Enhanced Radar with New Data and Control Features in 2018 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Program of Study:
ECE513
ECE656
ECE742
ECE795
MATH550
STAT525
N/A
N/A
