Influence of oscillator variations on the observed frequency behavior in software-based navigation receivers

Author

De Haag, Maarten Uijt ; Kelly, Joseph M.

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Ohio Univ., Athens, OH, USA

Volume

11

Issue

3

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

390

Lastpage

392

Abstract

This letter discusses the effects of oscillator behavior such as phase and frequency offsets on the observed frequency behavior in software-based receivers. Frequency errors introduced by the front-end oscillators and sample clocks cause the observed frequency to differ from the actual frequency. Frequency errors directly affect the user velocity and position estimates in navigation receivers unless these errors are explicitly estimated and removed. This letter will show the derivation of a quantitative relationship between the observed frequency and the true frequency of the received signal in the presence of local oscillator and sample rate errors.

Keywords

Doppler effect; Global Positioning System; radio receivers; radiofrequency oscillators; signal sampling; software radio; band pass sampling; carrier-phase estimation; code estimation; frequency errors; front-end oscillators; local oscillator; observed frequency behavior; oscillator variations; sample rate errors; software-based navigation receivers; software-based radios; user position estimates; user velocity estimates; Clocks; Frequency estimation; Frequency locked loops; Global Positioning System; Local oscillators; Radio navigation; Sampling methods; Satellites; Signal processing; Working environment noise;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2003.822595

Filename

1268037