Signal path delay determination
First Claim
1. A computer-readable storage medium that is not a transient signal, the computer-readable storage medium having instructions stored thereon, that when executed by at least one processor perform a method comprising:
- detecting a first plurality of signals at a first location;
detecting a second plurality of signals at a second location;
determining which signals of the first plurality and which signals of the second plurality are indicative of coming from a common source;
determining pairs of signals indicative of coming from a common source, wherein a pair of signals comprises a signal from the first plurality and a signal from the second plurality;
determining time delays for the pairs of signals indicative of coming from the common source, wherein a time delay indicates a time difference of arrival at a third location between reception of a signal from the first location and the second location;
determining a maximum time delay from among the determined time delays;
selecting a set of signals exhibiting the maximum time delay; and
estimating a propagation delay from the third location to the second location by combining propagation times of the selected set of signals between the first location and the third location and between the first location and the second location, together with an observed time delay at the third location of the selected set of signals.
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Accused Products
Abstract
Propagation time for a target signal path is determined by detecting and processing a plurality of unknown signals received at two locations. A third location is established, such that the propagation time between the third location and one of the two locations is known, and the signal path between the third location and the other of the two locations is the target signal path. The two locations are monitored for any signals that may be detected. Signals received at the two locations are processed to determine which signals have a common source, and of the signals having a common source, the signal having the greatest delay between times of reception at the two locations is selected. The selected signal is used to determine the propagation time between the two locations.
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Citations
5 Claims
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1. A computer-readable storage medium that is not a transient signal, the computer-readable storage medium having instructions stored thereon, that when executed by at least one processor perform a method comprising:
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detecting a first plurality of signals at a first location; detecting a second plurality of signals at a second location; determining which signals of the first plurality and which signals of the second plurality are indicative of coming from a common source; determining pairs of signals indicative of coming from a common source, wherein a pair of signals comprises a signal from the first plurality and a signal from the second plurality; determining time delays for the pairs of signals indicative of coming from the common source, wherein a time delay indicates a time difference of arrival at a third location between reception of a signal from the first location and the second location; determining a maximum time delay from among the determined time delays; selecting a set of signals exhibiting the maximum time delay; and estimating a propagation delay from the third location to the second location by combining propagation times of the selected set of signals between the first location and the third location and between the first location and the second location, together with an observed time delay at the third location of the selected set of signals. - View Dependent Claims (2, 3, 4, 5)
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Specification