@InProceedings{PamboukianKaufMoraKauf:2016:GNGeSy,
author = "Pamboukian, Sergio and Kaufmann, Pierre and Moraes, Rodolpho
Vilhena de and Kaufmann, Pedro L.",
affiliation = "{Universidade Presbiteriana Mackenzie} and {Universidade
Presbiteriana Mackenzie} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal do Estado de S{\~a}o
Paulo (UNIFESP)}",
title = "GNSS-FREE geo-referecing system using multiple LEO CUBESAT
formation",
year = "2016",
organization = "Latin American IAA CubeSat Workshop, 2.",
abstract = "CubeSats are ideal transponder carriers to integrate a new
GNSS-free geo-referencing system. The system concept might be
viewed as an in-verted GPS configuration, utilizing four
groundbased reference sta-tions and a number of repeaters in
space. A time signal transmitted by one of the reference bases is
retransmitted by transponders in space, re-ceived back at the
bases, producing four ranging measurements for each satellite. The
measurements are corrected for time delays in every time coded
retransmission caused by three main sources: the transit time at
the transponders, the path delays, and delays at the ground-based
trans-mitter and receivers antennas, cables and electronics. An
algorithm compares the repeaters positions for at least two groups
of three refer-ence bases, minimizing unknown signal delays,
providing the accurate position for each repeater. Once the
repeaters coordinates are known, the other determinations and
applications become straightforward. It is demonstrated by
simulations, based on the system performance algo-rithms, that
with a formation of at least four repeaters, the position of a
remote target is determined for a single coded time signal
transmission. A formation of multiple CubeSats in low earth orbits
(LEO) is particular-ly suitable to accomplish the new
georeferencing system. Simulations are presented, exhibiting
accuracies which may become comparable to other space-based
systems. This system has various strategic and eco-nomic
applications in remote clock synchronism, navigation and target
geo-positioning. It may be used as a backup to GNSS location
systems in critical applications, or when such systems are not
available.",
conference-location = "Florian{\'o}polis, SC",
conference-year = "28 Feb. - 02 Mar.",
targetfile = "pamboukian.pdf",
urlaccessdate = "27 abr. 2024"
}