Process for the autonomous reduction of acquisition and tracking thresholds of carriers received in orbit
AssigneeCentre National D'Etudes Spatiales
InventorJean-Luc Issler
Life of this patent
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Abstract
The present invention relates to a process for the autonomous reduction of acquisition and tracking thresholds of carriers received in orbit by a receiver accessing an orbital navigator inside or outside said receiver, the latter having at least one phase loop. The phase loop, which is responsible for the acquisition and/or tracking of the carrier, is "pushed" by the fine speed aid and takes up the error between the real speed and the calculated speed. The search for the Doppler frequency of the carrier received takes place around a frequency prediction maintained by the fine speed aid coming from the orbital navigator.
Claims4
A method for autonomously reducing at least one of an acquisition threshold and a tracking threshold of a carrier received in orbit by a receiver on a satellite accessing an on-board orbital navigator, comprising the steps of:
- receiving the carrier by the receiver;
- generating a fine speed aid on-board the satellite with a calculated speed from the on-board orbital navigator;
- pushing a phase loop with the fine speed aid so as to reduce an error between a real speed and the calculated speed;
- and
- performing a Doppler frequency search for the carrier around a frequency prediction provided by the fine speed aid.
Dependencies are inferred from the claim text.