 |
| Titel |
Enhanced timing accuracy for Cluster data |
| VerfasserIn |
K. H. Yearby, S. N. Walker, M. A. Balikhin |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
2193-0856
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 2, no. 2 ; Nr. 2, no. 2 (2013-12-19), S.323-328 |
| Datensatznummer |
250084929
|
| Publikation (Nr.) |
 copernicus.org/gi-2-323-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The standard timing accuracy for the Cluster mission is ±2 ms. However
for inter-spacecraft comparisons of waveform data, a much higher accuracy is
needed – for example a timing error of 1 ms results in a phase error of
65° for a signal at 180 Hz. Most Cluster data are recorded on an
onboard solid state recorder and time-stamped using an onboard clock which
is calibrated to coordinated universal time (UTC). Until recently, the error of this onboard clock was
allowed to increase to the ±2 ms limit before a new calibration was
applied. However, the timing error for real-time data is estimated to be
only ~11 μs, so these data may be used to prepare a
time correction data set which allows the standard timing accuracy to be
improved considerably. This paper describes the details of the preparation
and validation of this data set. Two independent source data sets are used:
telemetry to European Space Agency (ESA) ground stations supporting the main operations of the
Cluster spacecraft, and the real-time telemetry to the NASA Deep Space Network (DSN) stations
supporting the Wide-Band Plasma Wave Investigation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|