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On One-way Doppler Measurements of Space Craft and Celestial Objects

Jochim, Fritz (2010) On One-way Doppler Measurements of Space Craft and Celestial Objects. Acta Astronautica, Volume 66 (1 - 2), pp. 309-330. Elsevier. DOI: 10.1016/j.actaastro.2009.09.001. ISSN 0094-5765.

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Abstract

The orbital velocity of a spacecraft and other celestial objects is monitored by observing the Doppler frequency shift of the signals received at the ground station. This is possible one-way in case the transmitted frequency is stable enough. In most spacecraft a calibrated transponder allows two-way Doppler frequency registrations. In general, the factor 2 is expected as the quotient between two- and one-way frequencies. However, this is no longer the case when the motion of the observed object deviates from the orbit as predicted. Frequency differences appear. Porsche (1999) has published a formula to describe these differences based on the assumption of a double projection of the true velocity vector. In the present paper a more sophisticated analysis of the influence of state errors on the track-ing results is deduced. This theory has been tested by the Doppler measurements during flybys of the comet space probe GIOTTO penetrating through the comae of the comets P/Halley and P/Grigg-Skjellerup. One-way Doppler measurements of the low Earth satellites CHAMP and TERRASAR-X show a tendency for the applicability of this approach. Finally, some conse-quences for the observation of other celestial objects are discussed.

Document Type:Article
Title:On One-way Doppler Measurements of Space Craft and Celestial Objects
Authors:
AuthorsInstitution or Email of Authors
Jochim, FritzUNSPECIFIED
Date:January 2010
Journal or Publication Title:Acta Astronautica
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Volume 66
DOI:10.1016/j.actaastro.2009.09.001
Page Range:pp. 309-330
Publisher:Elsevier
ISSN:0094-5765
Status:Published
Keywords:One way Doppler measurements Interplanetary missions Giotto Satellite tracking Spacecraft state perturbation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt sicherheitsrelevante Erdbeobachtung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Thomas Neff
Deposited On:05 Feb 2010 07:13
Last Modified:21 Mar 2014 11:30

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