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US 8,912,955 B2Granted
Time synchronization with ambient sources
AssigneeMaxLinear, Inc.
InventorsCurtis Ling, Anand Anandakumar
Life of this patent
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Abstract
Systems and methods for extracting synchronization information from ambient signals, such as broadcast television signals, and using the synchronization information as a reference for correcting the local time base so that a GNSS positioning receiver system maintains relative time base accuracy with respect to a GNSS time.
Claims35
A GNSS system comprising:
- a GNSS receiver configured to establish a GNSS time;
- and
- an ambient signal receiver configured to:
- search for a plurality of ambient signals;
- detect signal types of the plurality of ambient signals;
- and
- assess a time base stability of each of the plurality of ambient signals, wherein the ambient signal receiver stores a plurality of signal characteristics associated with each of the plurality of ambient signals in the event that the time base associated with each of the plurality of ambient signals is within a predetermined phase stability, and does not store the plurality of signal characteristics associated with each of the plurality of ambient signals in the event that the time base associated with each of the plurality of ambient signals is not within the predetermined phase stability.
4 more elements
A method of processing a signal comprising:
- receiving a GNSS signal to establish a GNSS time;
- searching for a plurality of ambient signals;
- detecting signal types of the plurality of ambient signals;
- and
- assessing a time base stability of each of the plurality of ambient signals
- storing a plurality of signal characteristics associated with the plurality of ambient signals in the event that the time base associated with the plurality of ambient signals falls within a predetermined phase stability;
- and
- not storing the plurality of signal characteristics associated with the plurality of ambient signals in the event that the time base associated with the plurality of ambient signals does not fall within the predetermined phase stability.
5 more elements
Dependencies are inferred from the claim text.