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US 2009/0289842 A1Published application
Process for Improving the Continuity in the Case of a Two-Frequency Navigation Satellite System
AssigneeAstrium GmbH
InventorHans L. Trautenberg
Life of this patent
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Abstract
A process for improving continuity in a two-frequency navigation satellite system includes steps of i) observing the ionosphere by measurements in the two or more frequency bands; and ii) transmitting an alert message which informs user systems of a change of the ionosphere when at least one measurement indicates a change of the ionosphere that deviates from one or more predefined conditions.
Claims12
A process for improving continuity in a two-frequency navigation satellite system, said process comprising:
- observing the ionosphere by measurements in at least two frequency bands containing the frequencies of the two-frequency navigation satellite system;
- and
- transmitting an alert message which informs user systems of a change of the ionosphere when at least one measurement indicates a change of the ionosphere that deviates from at least one predefined conditions.
A two-frequency navigation satellite system, which comprises:
- a space segment having several satellites that emit satellite signals in two frequencies, said signals containing navigation messages for reception and evaluation by user systems for position indication and navigation;
- and
- a ground segment that includes a plurality of observation, and command stations which monitor the satellites;
- wherein at least one of the observation stations, command stations and satellites observes the ionosphere by measurements in at least two frequency bands containing the frequencies of the two-frequency navigation satellite system, and transmits an alert message which informs user systems of a change of the ionosphere when at least one measurement indicates a change of the ionosphere that deviates from at least one predefined conditions.
1 more element
Dependencies are inferred from the claim text.