CORRECTING FREQUENCY ERRORS IN FREQUENCY DIFFERENCE OF ARRIVAL GEOLOCATION SYSTEMS
First Claim
1. A computer-implemented method comprising:
- determining a frequency of a target signal at a first collector based upon, at least in part, a first reference timebase source associated with the first collector;
determining an intended frequency of a reference carrier signal at the first collector based upon, at least in part, the first reference timebase source associated with the first collector;
determining a frequency of the target signal at a second collector based upon, at least in part, a second reference timebase source associated with the second collector;
determining an observed frequency of the reference carrier signal at the second collector based upon, at least in part, the second reference timebase source associated with the second collector;
calculating a relative timebase error between the first collector and the second collector based upon, at least in part, a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal; and
calculating a corrected frequency difference for the target signal based upon, at least in part, the relative timebase error and a proportional scaling factor.
1 Assignment
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Accused Products
Abstract
A frequency correction for frequency difference of arrival geolocation of transmitted target signals may be provided. A frequency of a target signal may be determined at a first collector based upon a first reference timebase source. A frequency of the target signal may be determined at a second collector based upon a second reference timebase source. An observed frequency of a reference carrier signal based upon the first reference timebase source may be determined at the second collector based upon the second reference timebase source. A relative timebase error between the first collector and the second collector may be calculated based upon a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal. A corrected frequency difference for the target signal may be calculated based upon the relative timebase error and a proportional scaling factor.
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Citations
30 Claims
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1. A computer-implemented method comprising:
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determining a frequency of a target signal at a first collector based upon, at least in part, a first reference timebase source associated with the first collector; determining an intended frequency of a reference carrier signal at the first collector based upon, at least in part, the first reference timebase source associated with the first collector; determining a frequency of the target signal at a second collector based upon, at least in part, a second reference timebase source associated with the second collector; determining an observed frequency of the reference carrier signal at the second collector based upon, at least in part, the second reference timebase source associated with the second collector; calculating a relative timebase error between the first collector and the second collector based upon, at least in part, a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal; and calculating a corrected frequency difference for the target signal based upon, at least in part, the relative timebase error and a proportional scaling factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer program product comprising a computer readable medium having a plurality of instructions stored thereon, which, when executed by a processor, cause the processor to perform operations including:
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determining a frequency of a target signal at a first collector based upon, at least in part, a first reference timebase source associated with the first collector; determining an intended frequency of a reference carrier signal at the first collector based upon, at least in part, the first reference timebase source associated with the first collector; determining a frequency of the target signal at a second collector based upon, at least in part, a second reference timebase source associated with the second collector; determining an observed frequency of the reference carrier signal at the second collector based upon, at least in part, the second reference timebase source associated with the second collector; calculating a relative timebase error between the first collector and the second collector based upon, at least in part, a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal; and calculating a corrected frequency difference for the target signal based upon, at least in part, the relative timebase error and a proportional scaling factor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A computing system comprising:
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a processor and a memory module coupled with the processor, the processor being configured for; determining a frequency of a target signal at a first collector based upon, at least in part, a first reference timebase source associated with the first collector; determining an intended frequency of a reference carrier signal at the first collector based upon, at least in part, the first reference timebase source associated with the first collector; determining a frequency of the target signal at a second collector based upon, at least in part, a second reference timebase source associated with the second collector; determining an observed frequency of the reference carrier signal at the second collector based upon, at least in part, the second reference timebase source associated with the second collector; calculating a relative timebase error between the first collector and the second collector based upon, at least in part, a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal; and calculating a corrected frequency difference for the target signal based upon, at least in part, the relative timebase error and a proportional scaling factor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification