Synchronizing a digital GPS receiver

Author

Goiser, Aiois M J ; Berger, Gerald L.

Author_Institution

Inst. of Gen. Electr. & Electron., Tech. Univ. Wien, Austria

Volume

2

fYear

1996

fDate

13-16 May 1996

Firstpage

1043

Abstract

We investigate the synchronization behavior of a digital Global Positioning System (GPS) receiver. We focus our attention on code and carrier synchronization. Due to the large Doppler shift, the inaccurate receiver clock and the noisy environment, a combined time/frequency search is used for acquisition and tracking. Code acquisition is performed by a serial search algorithm. In the frequency domain a broken expanding window search is used. To achieve coherent demodulation, the uncertainty interval for the carrier frequency is minimized in discrete steps. Finally the correct frequency is found by a simple transform domain processing scheme to permit a narrowband digital PLL to lock

Keywords

Doppler effect; Doppler shift; Global Positioning System; demodulation; digital phase locked loops; digital radio; radio receivers; satellite tracking; search problems; signal processing; transforms; Doppler shift; Global Positioning System; broken expanding window search; carrier frequency; carrier synchronization; code acquisition; code synchronization; coherent demodulation; digital GPS receiver synchronization; frequency domain; narrowband digital PLL; noisy environment; receiver clock; serial search algorithm; time/frequency search; tracking; transform domain processing; uncertainty interval; Clocks; Demodulation; Discrete transforms; Doppler shift; Frequency domain analysis; Frequency synchronization; Global Positioning System; Narrowband; Uncertainty; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrotechnical Conference, 1996. MELECON '96., 8th Mediterranean

Conference_Location

Bari

Print_ISBN

0-7803-3109-5

Type

conf

DOI

10.1109/MELCON.1996.551387

Filename

551387