Mathematical Problems in Engineering
Volume 2009 (2009), Article ID 147326, 19 pages
doi:10.1155/2009/147326
Research Article

Simulations under Ideal and Nonideal Conditions for Characterization of a Passive Doppler Geographical Location System Using Extension of Data Reception Network

Cristina Tobler de Sousa,1 Rodolpho Vilhena de Moraes,1 and Hélio Koiti Kuga2

1UNESP-University, Estadual Paulista, Guaratinguetá, CEP 12516-410, SP, Brazil
2INPE-DMC, CP 515, S.J. Campos, CEP 12245-970, Brazil

Received 30 July 2009; Accepted 5 November 2009

Academic Editor: Maria Zanardi

Copyright © 2009 Cristina Tobler de Sousa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work presents a (Data Reception Network) DRN software investigation considering simulated conditions inserting purposely errors into the Doppler measurements, satellites ephemeris, and time stamp, to characterize the geographical location software (GEOLOC) developed by Sousa (2000) and Sousa et al. (2003). The extension of reception stations in Brazilian territory can result in more precise locations if the network is considered in the GEOLOC. The results and analyses were first obtained considering the ground stations separately, to characterize their effects in the geographical location (GL) result. Six conditions were investigated: ideal simulated conditions, random and bias errors in the Doppler measurements, errors in the satellite ephemeris, and errors in the time stamp in order to investigate the DRN importance to get more accurate locations; an analysis was performed considering the random errors of 1 Hz in the Doppler measurements. The results are quite satisfactory and also show good compatibility between the simulator and the GEOLOC using the DRN.