Method and apparatus for managing and configuring tracker components for enhanced sensitivity tracking of GNSS signals
AssigneeCSR Technology Inc.
InventorGary Lennen
Life of this patent
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Abstract
The present invention is related to location positioning systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver's navigation calculations. According to a first aspect, the invention provides an extreme sensitivity GNSS tracking architecture. According to other aspects, the architecture includes multiple loops per channel, with the loops implemented with hardware and/or software. According to still further aspects, the architecture includes a multi-level lock detection algorithm designed to provide a trade-off between sensitivity and speed that is not possible with existing tracking architectures.
Claims20
A GNSS tracker apparatus comprising:
- a fast lock detection that calculates a plurality of fast lock detect values for a corresponding plurality of first signal levels;
- a slow lock detection that calculates a plurality of slow lock detect values for the corresponding plurality of second signal levels;
- and
- a threshold detector that compares the calculated fast and slow lock values to associated thresholds.
A GNSS tracker apparatus, comprising:
- a fast lock detection that calculates a plurality of fast lock detect values for a corresponding plurality of first signal levels;
- a slow lock detection that calculates a plurality of slow lock detect values for a corresponding plurality of second signal levels;
- a threshold detector that compares the calculated fast and slow lock values to associated thresholds;
- and
- a signal strength estimator that provides a strength measurement for a signal being tracked based on a filtered version of a prompt signal magnitude.
A GNSS tracking method comprising:
- calculating a plurality of fast lock detect values for a corresponding plurality of first signal levels;
- calculating a plurality of slow lock detect values for the corresponding plurality of second signal levels;
- and
- comparing the calculated fast and slow lock values to associated thresholds.
A GNSS tracking method comprising:
- calculating a plurality of fast lock detect values for a corresponding plurality of first signal levels;
- calculating a plurality of slow lock detect values for a corresponding plurality of second signal levels;
- comparing the calculated fast and slow lock values to associated thresholds;
- and
- determining whether to kill a track using the calculated slow lock detect values,
- wherein the step of determining whether to kill the track is performed only if none of the calculated fast lock detect values for the track exceed their associated thresholds.
Dependencies are inferred from the claim text.