Time synchronization with ambient sources
First Claim
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1. 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.
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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.
22 Citations
35 Claims
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1. A GNSS system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of processing a signal comprising:
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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. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification