A New Algorithm of Compensation of the Time Interval Error GPS-Based Measurements by ProQuest

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In this paper we present a new algorithm of compensation of the time interval error (TIE) applying an unbiased p-step predictive finite impulse response (FIR) filter at the signal of the receiver Global Positioning System (GPS)-based measurements. The practical use of the system GPS involves various inherent problems of the signal. Two of the most important problems are the TIE and the instantaneous loss of the signal of the GPS by a small interval of time, called "holdover". The error holdover is a problem that at present does not possess solution and the systems that present this type of error produce lines of erroneous synchronization in the signal of the GPS. Basic holdover algorithms are discussed along with their most critical properties. Efficiency of the predictive filter in holdover is demonstrated in applications to GPS-based measurements of the TIE. [PUBLICATION ABSTRACT]

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									                    Sensors & Transducers Journal, Vol. 112, Issue 1, January 2010, pp. 124-137


                                                        Sensors & Transducers
                                                                                             ISSN 1726-5479
                                                                                              © 2010 by IFSA
                                                                                 http://www.sensorsportal.com




    A New Algorithm of Compensation of the Time Interval Error
                   GPS-Based Measurements
                   1,2
                     Jonny Paul ZAVALA DE PAZ, 2Yuriy S. SHMALIY
1
    Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional,
              Cerro Blanco 141, Col. Colinas del Cimatario, C.P. 76090, Querétaro, México
                                     Tel.: (442) 229 0804, ext. 81002
      2
        FIMEE, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago Km 3.5+1.8 Km
                     Comunidad de Palo Blanco, C.P. 36885 Salamanca, Gto., México
                                    E-mail: jopazavala@hotmail.com


         Received: 29 October 2010 /Accepted: 22 January 2010 /Published: 29 January 2010


Abstract: In this paper we present a new algorithm of compensation of the time interval error (TIE)
applying an unbiased p-step predictive finite impulse response (FIR) filter at the signal of the receiver
Global Positioning System (GPS)-based measurements. The practical use of the system GPS involves
various inherent problems of the signal. Two of the most important problems are the TIE and the
instantaneous loss of the signal of the GPS by a small interval of time, called "holdover". The error
holdover is a problem that at present does not possess solution and the systems that present this type of
error produce lines of erroneous synchronization in the signal of the GPS. Basic holdover algorithms
are discussed along with their most critical properties. Efficiency of the predictive filter in holdover is
demonstrated in applications to GPS-based measurements of the TIE. Copyright © 2010 IFSA.

Keywords: GPS-based measurements, Time interval error, Holdover, Unbiased predictive FIR filter



1. Introduction
The problem of accuracy of wirelessly disciplined local clocks and oscillators arises whenever a
synchronizing signal is temporary not available. The relevant operation mode is termed “holdover” and
technical solutions for holdover are often crucial for both ground and space applications. Holdover can
also be implied for available, but “bad” synchronizing signals.

In different applications, it is required to obtain normal functioning in holdover during all time. In deep
                               
								
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