Fast Doppler tracking DSP-based Earth station modem for LEO satellite applications

Author

Kandeepan, Sithamparanathan ; Reisenfeld, Sam

fYear

2004

fDate

18-19 Nov. 2004

Firstpage

332

Lastpage

337

Abstract

A fast Doppler (carrier frequency drift) tracking Earth station modem is presented. The modem is designed to track high carrier frequency offsets for low-Earth orbital (LEO) satellite applications. LEO satellites have very high Doppler offsets with considerable Doppler rates (rate of change of frequency). The Earth station modem tracks Doppler offsets at a data rate of 128 ksym/s for QPSK modulation. The synchronisation circuit of the modem consists of frequency synchronisation, symbol timing synchronisation and phase synchronisation. We look into the design and performance analysis of the modem, particularly the synchronisation system of the modem.

Keywords

Doppler effect; modems; network synthesis; quadrature phase shift keying; satellite ground stations; signal processing; synchronisation; DSP-based modem; Doppler offsets; Doppler tracking modem; Earth station modem; LEO satellite applications; QPSK modulation; carrier frequency drift; frequency synchronisation; phase synchronisation; symbol timing synchronisation; Australia; Finite impulse response filter; Frequency synchronization; Low earth orbit satellites; Modems; Pulse shaping methods; Quadrature phase shift keying; Satellite ground stations; Signal processing; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Signal Processing and Communication Systems, 2004. ISPACS 2004. Proceedings of 2004 International Symposium on

Print_ISBN

0-7803-8639-6

Type

conf

DOI

10.1109/ISPACS.2004.1439070

Filename

1439070