AIRBORNE TURBULENCE LOCATION SYSTEM AND METHODS
First Claim
1. A method for calculating a range from a turbulent air region to a platform to determine the location of the turbulent air region with respect to said platform, the method comprising:
- propagating an electromagnetic signal through the turbulent air region;
determining a correlation lag value in propagation of an interference pattern comprising said electromagnetic signal from a first antenna to a second antenna, wherein the correlation lag value corresponds to a time shift caused by the turbulent air region, and wherein the turbulent air region is in a path of said electromagnetic signal sent from a satellite to the platform; and
calculating the range based upon the correlation lag value.
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Abstract
A system and methods for calculating a range to a turbulent air region from an antenna platform is disclosed. The methods determine a correlation lag value corresponding to a time shift in receiving propagation of an interference pattern traveling along a path that is subject to the turbulent air region at antennas responsive to incident electromagnetic energy. Based upon the correlation lag value, the methods calculate the range to the turbulent air region from the antenna platform and issue a warning that indicate the range.
17 Citations
27 Claims
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1. A method for calculating a range from a turbulent air region to a platform to determine the location of the turbulent air region with respect to said platform, the method comprising:
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propagating an electromagnetic signal through the turbulent air region; determining a correlation lag value in propagation of an interference pattern comprising said electromagnetic signal from a first antenna to a second antenna, wherein the correlation lag value corresponds to a time shift caused by the turbulent air region, and wherein the turbulent air region is in a path of said electromagnetic signal sent from a satellite to the platform; and calculating the range based upon the correlation lag value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for calculating a range from a turbulent air region to a platform to determine the location of said turbulent air region with respect to said platform, the method comprising:
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propagating an electromagnetic signal from a satellite through said turbulent air region; sampling a first series of said electromagnetic signal amplitudes, corresponding to an interference pattern, at a first antenna and at a sampling interval; sampling a second series of said electromagnetic signal amplitudes corresponding to the interference pattern, at a second antenna and at the sampling interval; calculating temporal correlation coefficients between the first series and the second series of signal amplitudes; calculating correlation lag values corresponding to the calculated temporal correlation coefficients; selecting the correlation lag value corresponding to the highest value of the calculated temporal correlation coefficients, wherein the correlation lag value corresponds to a time shift, caused by the turbulent air region, in receiving the interference pattern at the first antenna and the second antenna; and calculating the range based upon the correlation lag value. - View Dependent Claims (13, 14, 15, 16)
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17. A system for calculating a range from a turbulent air region to a platform to determine the location of said turbulent air region with respect to said platform, the system comprising:
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a plurality of antennas, each responsive to incident electromagnetic energy propagated through the turbulent air region to produce a received interference pattern, wherein the electromagnetic energy travels along a path that is subject to the turbulent air region; a receiver coupled to the antennas and configured to measure properties of the received interference pattern; and a processing logic element coupled to the receiver and configured to; determine a correlation lag value, wherein the correlation lag value corresponds to a time shift, caused by the turbulent air region, in propagation of the received interference pattern from a first antenna to a second antenna; and calculate the range based upon the correlation lag value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for calculating a range from a turbulent air region to a platform to determine the location of said turbulent air region with respect to said platform, the method comprising:
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propagating an electromagnetic signal from a satellite through said turbulent air region; sampling a first series of said electromagnetic signal phases, corresponding to an interference pattern, at a first antenna and at a sampling interval; sampling a second series of said electromagnetic signal phases, corresponding to the interference pattern, at a second antenna and at the sampling interval; calculating temporal correlation coefficients between the first series and the second series of signal phases; calculating correlation lag values corresponding to the calculated temporal correlation coefficients; selecting the correlation lag value corresponding to the highest value of the calculated temporal correlation coefficients, wherein the correlation lag value corresponds to a time shift, caused by the turbulent air region, in receiving the interference pattern at the first antenna and the second antenna; and calculating the range based upon the correlation lag value.
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Specification