Signal path delay determination
First Claim
1. A method for estimating a delay time of a propagation path of, the 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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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
10 Claims
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1. A method for estimating a delay time of a propagation path of, the 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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6. A processor configured to estimate a delay time of a propagation path, the processor comprising:
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an input/output portion configured to; detect a first plurality of signals at a first location; and detect a second plurality of signals at a second location; and a processing portion configured to; determine which signals of the first plurality and which signals of the second plurality are indicative of coming from a common source; determine at least one pair 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; determine a time delay for each pair of signals, wherein a time delay indicates a time difference between reception of a signal at the first location and the second location; determine a maximum delay of the determined time delays; select a signal having the maximum delay; determine a propagation time of the selected signal from the first location to a third location and a propagation time from the second location to a third location; and estimate a propagation delay from the third location to the second location by subtracting a propagation time of the selected signal between the first location and the third location from a propagation time of the selected signal between the first location and the third location. - View Dependent Claims (7, 8, 9, 10)
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Specification