J. Phys. Colloques
Volume 42, Numéro C8, Décembre 1981Troisième Symposium sur les Etalons de Fréquence et la Métrologie / Third Symposium on Frequency Standards and Metrology
|Page(s)||C8-415 - C8-426|
J. Phys. Colloques 42 (1981) C8-415-C8-426
THE IMPACT OF VERY STABLE OSCILLATORS ON NAVIGATION SYSTEMSR. Moreau
Office National d'Etudes et de Recherches Aérospatiales (ONERA), 92320 Châtillon, France
The high stability achieved by oscillators driven by quartz or by atomic transitions is such that their time scales, when used in navigation systems, remain coherent at all locations . For that reason, it is no longer necessary to provide eitheir for transfer o f the time parameter by radio waves from station to station and from station to vehicle, or for its treatment as an additional unknown in the equations. This situation makes it possible to constitute time frequency navigation systems with many advantages, namely direct access to circulator spheric modes, this possibility giving higher accuracy and reduced sensitivity to geometric parameters.