Delay Difference Calibration of TWSTFT Earth Station Using Multichannel Modem

Author

Fujieda, Miho ; Aida, Masanori ; Maeno, Hideo ; Lam Quoc Tung ; Amagai, Jun

Author_Institution

Nat. Inst. of Inf. & Commun. Technol., Koganei

Volume

56

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

346

Lastpage

350

Abstract

Delays in signal transmission and reception paths of an Earth station must be calibrated accurately, and their variation should be reduced in the two-way satellite time and frequency transfer (TWSTFT). We have developed a portable TWSTFT station using a modem built by the National Institute of Information and Communications Technology (NICT) and performed calibration between NICT and Telecommunication Laboratories. An uncertainty of about 1 ns in the differential calibration was achieved. In addition, we have monitored the delay variation in the Earth station using a measurement system installed at NICT to improve accuracy of the TWSTFT. The contributed instability was 50 ps/day

Keywords

calibration; delay estimation; frequency standards; measurement systems; measurement uncertainty; modems; portable instruments; satellite ground stations; time measurement; transfer standards; TWSTFT; delay difference calibration; earth station; measurement uncertainty; multichannel modem; pseudonoise coded communication; two way satellite time and frequency transfer; Artificial satellites; Calibration; Communications technology; Delay effects; Frequency; Laboratories; Low-noise amplifiers; Modems; Satellite ground stations; Stimulated emission; Calibration; pseudonoise coded communication;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2007.891127

Filename

4126861