@InProceedings{MoraesKugKauKauPam:2015:PrSaOr,
author = "Moraes, Rodolpho Vilhena de and Kuga, H{\'e}lio Koiti and
Kaufmann, Pierre and Kaufmann, P. L. and Pamboukian, S. V. D.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Preliminary satellite orbit determinations using a new system for
geo-referencing",
year = "2015",
organization = "IUGG General Assembly, 26.",
abstract = "The orbit of an artificial satellite carrying a radio signal
transponder is determined using a new geo-referencing system. It
utilizes four ground-based reference stations, synchronized in
time, installed at well known geodetic coordinates, and a repeater
in space. It is based in coded time signal propagation times from
one base to the others bounced back by the transponder. The
process corrects added up time delays due to signal transit times
in the transponder, and for delays due to propagation paths and
electronics at distinct ends. We examine the process application
for an artificial satellite carrying transponder, the orbit of
which we want to determine. The influence of harmonics of high
order and degree due to the non-uniform distribution of the Earths
mass are considered in orbit determination. The paper describes
aspects of the new geo-referencing system and the dynamic modeling
used in the orbit determination system. The specific uncertainties
of measurements arising from this system are properly taken into
account. A simulation performed with four ground bases located in
Brazil and low altitude transponder proved the system concept.
Results show that transponder position accuracies of less than 1
meter are attainable using standard good quality synchronized
clocks. We extend this simulation to orbit determination of
satellites. The major advantages and drawbacks of such system are
discussed. Actual tests on orbiting satellites may be accomplished
using available transponders in existing satellites, as well as in
future cubesat satellites being developed by Brazilian
universities.",
conference-location = "Prague, Czech Republic",
conference-year = "22 June - 02 July",
targetfile = "moraes_preliminary.pdf",
urlaccessdate = "27 abr. 2024"
}