Determining transmit location of an emitter using a single geostationary satellite
First Claim
1. A method of determining the transmit location of an emitter using a single geostationary satellite, the method comprising:
- receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at first and second time instances;
determining a first line of position based on a first difference in frequency for the received signal between the first and second time instances;
receiving the signal from the emitter and relayed by the geostationary satellite, the signal being received at the ground station at third and fourth time instances;
determining a second line of position based on a second difference in frequency for the received signal between the third and fourth time instances; and
determining the transmit location of the emitter based on the first line of position and the second line of position.
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Accused Products
Abstract
The present invention provides a method and apparatus for determining the transmit location of an emitter using a single geostationary satellite. In an embodiment, a signal is received at a ground station from the emitter and relayed by the geostationary satellite. The signal is received at the ground station at a plurality of time instances and has a plurality of observed frequencies, one for each time instance. A plurality of lines of position are determining based on the plurality of observed frequencies. The transmit location of the emitter is determined based on at least one intersection among the plurality of lines of position.
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Citations
41 Claims
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1. A method of determining the transmit location of an emitter using a single geostationary satellite, the method comprising:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at first and second time instances; determining a first line of position based on a first difference in frequency for the received signal between the first and second time instances; receiving the signal from the emitter and relayed by the geostationary satellite, the signal being received at the ground station at third and fourth time instances; determining a second line of position based on a second difference in frequency for the received signal between the third and fourth time instances; and determining the transmit location of the emitter based on the first line of position and the second line of position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of determining the transmit location of an emitter using a single geostationary satellite, the method comprising:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; determining a plurality of lines of position based on the plurality of observed frequencies; and determining the transmit location of the emitter based on at least one intersection among the plurality of lines of position. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of determining the transmit location of an emitter using a single geostationary satellite, the method comprising:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; determining latitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a first direction; determining longitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a second direction; and determining the transmit location of the emitter based on the determined latitude and longitude. - View Dependent Claims (35)
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36. A computer program product for determining the transmit location of an emitter, the computer program stored on a non-transitory computer readable medium and adapted to perform operations of:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at first and second time instances; determining a first line of position based on a first difference in frequency for the received signal between the first and second time instances; receiving the signal from the emitter and relayed by the geostationary satellite, the signal being received at the ground station at third and fourth time instances; determining a second line of position based on a second difference in frequency for the received signal between the third and fourth time instances; and determining the transmit location of the emitter based on the first line of position and the second line of position.
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37. A computer program product for determining the transmit location of an emitter, the computer program stored on a non-transitory computer readable medium and adapted to perform operations of:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; determining a plurality of lines of position based on the plurality of observed frequencies; and determining the transmit location of the emitter based on at least one intersection among the plurality of lines of position.
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38. A computer program product for determining the transmit location of an emitter, the computer program stored on a non-transitory computer readable medium and adapted to perform operations of:
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receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; determining latitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a first direction; determining longitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a second direction; and determining the transmit location of the emitter based on the determined latitude and longitude.
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39. A system for determining the transmit location of an emitter using a single geostationary satellite, the system comprising:
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a ground station for receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at first and second time instances and the signal being received at the ground station at third and fourth time instances; means for determining a first line of position based on a first difference in frequency for the received signal between the first and second time instances; means for determining a second line of position based on a second difference in frequency for the received signal between the third and fourth time instances; and means for determining the transmit location of the emitter based on the first line of position and the second line of position.
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40. A system for determining the transmit location of an emitter using a single geostationary satellite, the system comprising:
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a ground station for receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at the ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; means for determining a plurality of lines of position based on the plurality of observed frequencies; and means for determining the transmit location of the emitter based on at least one intersection among the plurality of lines of position.
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41. A system for determining the transmit location of an emitter using a single geostationary satellite, the system comprising:
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a ground station for receiving a signal from the emitter and relayed by the geostationary satellite, the signal being received at a ground station at a plurality of time instances and having a plurality of observed frequencies, one for each time instance; means for determining latitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a first direction; means for determining longitude of the emitter from observed frequencies obtained while the geostationary satellite is moving in a second direction; and means for determining the transmit location of the emitter based on the determined latitude and longitude.
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Specification