A New Independent GPS-Free System for Geo-Referencing from Space - Positioning

POS > Vol.5 No.2, May 2014

Positioning

Volume 5, Issue 2 (May 2014)

ISSN Print: 2150-850X ISSN Online: 2150-8526

Google-based Impact Factor: 1 Citations

A New Independent GPS-Free System for Geo-Referencing from Space ()

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Download as PDF (Size: 478KB) PP. 37-45

DOI: 10.4236/pos.2014.52005 3,595 Downloads 5,132 Views Citations

Author(s)

P. Kaufmann, P. L. Kaufmann, S. V. D. Pamboukian, R. Vilhena de Moraes

Affiliation(s)

Dinamica Orbital e Planetologia, Universidade Federal do Estado de S?o Paulo, S?o José dos Campos, Brasil.
Escola de Engenharia, CRAAM, Universidade Presbiteriana Mackenzie, S?o Paulo, Brasil; Centro de Componentes Semicondutores, Universidade Estadual de Campinas, Campinas, Brasil.
Escola de Engenharia, CRAAM, Universidade Presbiteriana Mackenzie, S?o Paulo, Brasil; Escola de Engenharia, Laboratório de Geotecnologias, Universidade Presbiteriana Mackenzie, S?o Paulo, Brasil.
Instituto de Matemática e Estatística, Universidade de S?o Paulo, S?o Paulo, Brasil.

ABSTRACT

A new system’s geo-referencing from space is entirely free from any GNSS (GPS or equivalent) systems. The system addresses to various strategic and economic applications such as in remote clock synchronism, aircraft and balloon navigation, missile and smart bombs tracking, satellite orbital determination and remote target geo-positioning. The new geometry concept corresponds to an “inverted GPS” configuration, utilizing four ground-based reference stations, synchronized in time, installed at well known geodesic coordinates and a repeater in space, carried by an aircraft, balloon, satellite, etc. Signal transmitted by one of the reference bases is retransmitted by the transponder, received back by the four bases, producing four ranging measurements which are corrected for the time delays undergone in every retransmission. A minimization function was derived to compare the repeater’s positions referred to at least two groups of three reference bases, to correct for the signal transit time at the repeater and propagation delays, and consequently to provide the accurate repeater position for each time interaction. Once the repeater’s coordinates are known, the other determinations and applications become straightforward. The system solving algorithm and process performance has been demonstrated by simulations adopting a practical example with the transponder carried by an aircraft moving over bases and a target on the ground. Effects produced by reference clock synchronism uncertainties at the four bases on the measurements are reviewed.

KEYWORDS

Geo-Referencing from Space, GPS-Free Time Synchronization, Navigation and Positioning, Space Geodesy, Remote Ranging Transponder Transit Times, Propagation Path Delays

Share and Cite:

Kaufmann, P. , L. Kaufmann, P. , V. D. Pamboukian, S. and Vilhena de Moraes, R. (2014) A New Independent GPS-Free System for Geo-Referencing from Space. Positioning, 5, 37-45. doi: 10.4236/pos.2014.52005.

Cited by

[1]	Geolocal–A New System for Geo-Referencing: Analysis of Base Distribution
	2020

[2]	ESTUDO DA TOPOLOGIA DO SISTEMA GEOLOCAL: UM SISTEMA DE NAVEGAÇÃO BRASILEIRO INDEPENDENTE DE GNSS
	2020

[3]	Análise gráfica do PDOP no sistema Geolocal
	2019

[4]	PRELIMINARY SATELLITE ORBIT DETERMINATIONS USING A NEW SYSTEM FOR GEO-REFERENCING
	Conference Paper, 2015

[5]	1INPE, São José dos Campos-SP, Brazil; 2U. P. MACKENZIE-SP, Brazil, 3UNIFESP, São José dos Campos-SP, Brazil

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