Sensors & Transducers Journal

    (ISSN 1726- 5479)

Vol. 79, Issue 5, May 2007, pp. 1151-1156

An Analysis of Sawtooth Noise in the Timing SynPaQ III GPS Sensor

Yuriy S. SHMALIY, Oscar IBARRA-MANZANO,

Luis ARCEO-MIQUEL, Jorge MUNOZ-DIAZ

Electronics Department, Guanajuato University, FIMEE

Tampico 912, Salamanca, 36730, Gto., Mexico

E-mail: shmaliy@salamanca.ugto.mx

Received: 9 April 2007   /Accepted: 11 May 2007   /Published: 31 May 2007

Abstract: This paper addresses a probabilistic analysis of sawtooth noise in the one pulse per second (1PPS) output of the timing SynPaQ III GPS Sensor. We show that sawtooth noise is uniformly distributed within the bounds caused by period of the Local Time Clock of the sensor and that the probability density function (pdf) of this noise is formed with 1ns sampling interval used in the sensor to calculate the negative sawtooth. We also show that the pdf has at zero a spike of 1ns width caused by roll-off. It is demonstrated that an unbiased finite impulse response filter is an excellent suppresser of such a noise in the estimates of the time interval errors of local clocks.

Keywords: GPS timing, Time interval error, Time sensor, Sawtooth noise, Probability density function.

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