| Zugriffsnummer | 28016 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Quasi-stationary signal-in-space measurements using traceable antennas |
| Autor(in); Institution |
Bredemeyer, Jochen; FCS Flight Calibration Services GmbH, Braunschweig, GERMANY
Schrader, Thorsten; 2.2, Hochfrequenz und Felder, PTB-Braunschweig
Kleine-Ostmann, Thomas; 2.2, Hochfrequenz und Felder, PTB-Braunschweig
Garbe, Heyno; Universität Hannover, Institut für Grundlagen der Elektrotechnik und Messtechnik, Hannover, GERMANY
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| Quelle/Jahr | 17th International Flight Inspection Symposium:(2012), 125 - 131 |
| Verlag | [s.l.]: Deutsche Flugsicherung |
| Konferenzangaben | 17th International Flight Inspection Symposium: Waypoints to New Horizons, Braunschweig, 04-08, June, 2012, Germany |
| Freie Schlagworte | In-Flight Measurements ; Traceable Antenna Calibration |
| Zusammenfassung | A helicopter-based measurement process to supplement conventional flight inspection of terrestrial navigation aids is described. The platform allows, rather than typical flight inspection with an aircraft, a stationary hover in critical areas which then provides an increased observation time at a quasi-stationary position. A reference antenna having an antenna factor (AF) traceable to national calibration standards and therefore to the International System of Units (SI) is used to measure the true field strength of the electromagnetic far field. The hovering helicopter carries on its load hook the autonomous payload which consists of the reference antenna and the receiving/recording system. In contrast to conventional methods, the raw bandpass signal-in-space covering the complete channel bandwidth is sampled at a high data rate and is directly recorded without any preprocessing. This preserves maximum opportunities for any signal post-processing to draw the essential parameters of interest. The paper describes the deployment of a reference method to measure the absolute field strength within a known uncertainty. This facility is then used to validate the installed performance of flight inspection ILS LOC/VOR antennas. |
