SAR IMAGE FORMATION WITH EMBEDDED QPSK COMMUNICATIONS IN LFM GUARDBANDS AND UAV ANTENNA CHARACTERIZATION
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Authors
Negron Perez, Mariano
Subjects
unmanned aerial vehicle
UAV
SAR
radar
embedded QPSK
linear frequency modulated
LFM
UAV
SAR
radar
embedded QPSK
linear frequency modulated
LFM
Advisors
Jenn, David C.
Romero, Ric
Date of Issue
2022-03
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Synthetic aperture radar (SAR) imaging with the use of a small-sized unmanned aerial vehicle (UAV) is a fairly recent and very promising application. There are two main thrusts in this thesis: a) SAR imaging with radar-communications waveform, and b) antenna characterizations with a UAV. Quadrature phase shift keying (QPSK) modulation is embedded to transmit data to a communications receiver via the guardbands of a linear frequency modulated (LFM) signal for SAR. Images are formed with the LFM-QPSK combined signal (i.e., there is no need to filter out the communications signal in the radar receiver). We vary signal-to-noise power ratio and LFM to communications bandwidth ratio and investigate how each parameter affects the SAR images generated. We also look at the effect of shifting the communications carriers away from the LFM spectrum on the SAR image. The next step in developing and fielding a system is selecting an antenna and performing a pattern characterization with a UAV via radio frequency transmission to ground receiver. Antenna characterization is performed by transmitting a continuous wave signal from a UAV and measuring received power from a seven-element Yagi antenna on the ground.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
Sponsors
SAF
Funder
Format
Citation
Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.