Spaceborne signals of opportunity for reflectometry and scatterometry
Typ
Examensarbete för masterexamen
Program
Communication Engineering (MPCOM), MSc
Publicerad
2020
Författare
Isaksson, Frans-Erik
Bennet, Patrik
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
This master’s thesis is carried out in two main parts. The first part is a compilation
of literature studies of the general passive reflectometry and scatterometry principles,
techniques, capabilities and needs. The second part, motivated by arguing the
results of the previous, consists of an implemented agriculture soil moisture PAssive
Reflectometry and Interferometry System (PARIS) experiment using Ku-band TV
Direct Broadcasting Satellite (TV-DBS) opportunity signals. It includes the definition
of the experiment setup as well as the derivation of a system model indicating
the expected performance. It also covers the process of designing, implementing and
verifying the PARIS RF hardware front-end and signal processing software, generating
the Delay-Doppler Map (DDM) measurement results. The experiment was
performed at the World Heritage Grimeton Radio Station where the PARIS was
installed at 120 meters height in an antenna tower overlooking the surrounding agriculture.
The results show that the Ku-band TV-DBS PARIS is able to clearly detect
the signal at all four measurement areas investigated, even when that differs from
the expected region of specular reflection. The measurements Signal-to-Noise Ratio
(SNR) varies in between about 10 to 24 dB, while the system model expect it to be
exponentially distributed around 18.5 dB. The signal scattering is concluded to consist
of both significant specular and diffuse parts, possibly allowing for simultaneous
measurements of the the whole system antenna beam coverage area independent of
the direction of observation. Future prospects of a Ku-band TV-DBS soil moisture
PARIS is extrapolated from the experiment results and discussed, with focus put on
three thought products - a stationary installation overlooking agriculture, a dronecarried
monitoring system as well as a Low-Earth Orbit (LEO) small satellite Earth
Observation (EO) constellation.
Beskrivning
Ämne/nyckelord
Remote sensing, passive reflectometry, passive scatterometry, spaceborne signals of opportunity, SOOP, soil moisture measurement, passive reflectometry and interferometry system, PARIS, Earth observation, EO, Ku-band reflectometry, TV-DBS opportunity signals, delay-Doppler map, DDM