Digital Doppler measurement with spacecraft

Author

Kinman, Peter W. ; Hinedi, Sami M. ; LaBelle, Remi C. ; Bevan, Roland P. ; Del Castillo, Hector M. ; Chong, Dwayne C.

Author_Institution

Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA

Volume

40

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

727

Lastpage

731

Abstract

Digital and analog phase-locked loop (PLL) receivers were operated in parallel, each tracking the residual carrier from a spacecraft. The PLL tracked the downlink carrier and measured its instantaneous phase. This information, combined with a knowledge of the uplink carrier and the transponder ratio, permitted the computation of a Doppler observable. In this way, two separate Doppler measurements were obtained for one observation window. The two receivers agreed on the magnitude of the Doppler effect to within 1 mHz. There was less jitter on the data from the digital receiver. This was due to its smaller noise bandwidth. The demonstration and its results are described

Keywords

Doppler effect; digital radio systems; phase-locked loops; radio receivers; space communication links; tracking systems; analog phase-locked loop; digital Doppler measurement; digital receiver; downlink carrier; instantaneous phase; microwave links; noise bandwidth; residual carrier; spacecraft; telemetry; transponder ratio; uplink carrier; Bandwidth; Doppler effect; Doppler measurements; Downlink; Jitter; Phase locked loops; Phase measurement; Space vehicles; Tracking loops; Transponders;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.85342

Filename

85342