Walter Scott, Jr. College of Engineering

Graduate Exam Abstract

Shashank Srinivas Joshil
M.S. Final
Aug 30, 2018, 9:00 am - 11:00 am
LSC Room 376-78
Salient features of the D3R radar enhancements
Abstract: D3R radar was developed to serve as a
ground validation tool for the dual
precipitation radar in the core satellite
for the Global Precipitation
Measurement mission. In order to have
more flexibility in operations and
improve the features of D3R, the radar
was upgraded. Simulations were
carried out so that the best design
could be determined and implemented
on the upgraded D3R (D3R 2.0). The IF
subsystems and the digital receiver
module which consist of arbitrary
waveform generators and the digital
receivers of the Ku and Ka bands were
changed to support the new features.
To enhance signal processing features
and make the system compatible with
the new design, the D3R software was
also upgraded. In this work, the design,
implementation and tests carried out
during the upgrade work for the D3R
are discussed. The range-velocity
ambiguity techniques which work well
with low frequency radars pose a
challenge in the case of high frequency
radars such as in D3R due to limited
Doppler spectrum available. The
existing method in D3R to mitigate the
range ambiguity problem using random
phase codes and staggered PRT is
explained and the performance of the
method is shown for D3R data. The
performance of random phase codes
and systematic phase codes for range
ambiguity mitigation and future changes
in D3R 2.0 range ambiguity mitigation
technique are discussed. A velocity
ambiguity mitigation technique using
the dual-frequency information is
developed for D3R 2.0; the
implementation is explained along with
its performance on radar observations.
The D3R 2.0 went through initial
calibration and testing before being
deployed to the ICE-POP field
campaign in South Korea. The first
results after the upgrade are presented.
Adviser: Dr. V. Chandrasekar
Co-Adviser: N/A
Non-ECE Member: Dr. Susan P. James
Member 3: Dr. Anura P. Jayasumana
Addional Members: N/A
Please contact for details.
Program of Study: