Earth remote sensing from a stratospheric sounding balloon
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REPORT_449.pdf (5,023Mb) (Accés restringit)
ANNEX_305.pdf (1,184Mb) (Accés restringit)
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/328294
Tipus de documentTreball Final de Grau
Data2018-01-10
Condicions d'accésAccés restringit per decisió de l'autor
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Abstract
This project presents the proof-of-concept of the new cost-effective Earth remote sensing
GNSS-DIRECT payload, suitable for small satellites such as CubeSats. This new
instrument has been designed at ESEIAAT-UPC (http://eseiaat.upc.edu/ca) during a
Final Degree Project, and it will be tested for first time during a stratospheric sounding
balloon experiment in the frame of the INSPIRE programme
(http://www.terrassa.upc.edu/contingut/programa-inspire). The processing technique
implemented in the GNSS-DIRECT payload can provide accurate GNSS RadioOccultation (GNSS-RO) observations of the atmosphere. Simultaneously, GNSS
Reflectometry (GNSS-R) measurements of the Earth surface can be collected for
grazing angles, when coherent scattering effects provide strong forward scattered GPS
signals. Results from this experiment will be investigated to determine the degree of
signal coherence over land surfaces from a high altitude, and low speed platform. This
scenario will provide a unique opportunity for research, and conclusions could be useful
to improve our understanding on the use of GNSS for remote sensing.
The experimental set-up has been developed using COTS (Commercial Off-The-Shelf)
components. The On-Board Data Handling (OBDH) subsystem uses an ARM A-53 CPU
with 1.2 GHz clock rate for housekeeping and scientific data management, and data
storage in a SD card. A passive thermal control is implemented to optimize power
consumption, and mass. A GPS receiver, and a Kalman filter-based Inertial
Measurement Unit (IMU) provides timing and positioning information for applications
such as radio-occultation. The GNSS-DIRECT instrument is connected to an active limblooking antenna to receive GPS signals. The up-looking single-patch antenna is
connected to the GPS module, and receives only the direct signal. The GNSS satellites
transmit signals at Right Hand Circular Polarization (RHCP), and thus, this is the selected
polarization for the up-looking antenna. On the other hand, the limb-looking antenna
receives reflected and direct (RO) signals. The reflected signals are mainly Left Hand
Circular Polarized (LHCP), however for elevation angles larger than the Brewster angle,
the RHCP component becomes dominant. In this specific experiment at grazing angles,
the selected polarization is RHCP allowing to combine GNSS-RO and GNSS-R
measurements using a single-port antenna. GNSS-DIRECT will be configured to work in
a single nominal operational mode (conventional GNSS-R or cGNSS-R) in the flight
range up to 30,000 m. The flight duration is expected to be 3 h, and the trajectory is
expected to cover several land-surfaces types.
Descripció
The engineering of a sounding balloon capsule shares many aspects with a satellite, such as thermal regulation problems, mass and power restrictions or the need to use radio links. Also, the data obtained by a sounding balloon in a well-designed experiment can be very interesting from a technical or scientific point of view. This work is part of a series of TFG/TFM that will be carried out with support of Dr. Hugo Carreño, currently working in NASA-JPL, aimed to provide the students with a theoretical and practical knowledge of sounding balloons engineering. GoalThe main goal of this project is to design and operate a radio-occultation payload for Earth remote sensing from an stratospheric balloon
MatèriesReflection (Optics), Global Positioning System, Balloons, Reflexió (Òptica), Sistema de posicionament global, Globus aerostàtics
TitulacióGRAU EN ENGINYERIA EN VEHICLES AEROESPACIALS (Pla 2010)
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
REPORT_449.pdf | 5,023Mb | Accés restringit | ||
ANNEX_305.pdf | 1,184Mb | Accés restringit | ||
BUDGET_461.pdf | 541,4Kb | Accés restringit |