Geo-location of jamming signals
First Claim
1. A method of locating a ground-based source of a jamming signal capable of disrupting a satellite-based navigation system, wherein the method comprises using a detector at locations on a path to make measurements of one or more characteristics of the jamming signal, the method comprising the following steps:
- using the detector at a first location on the path to make one or more of the measurements;
choosing a second location on the path from which one or more further of the measurements are to be made by the detector;
moving the detector from the first location to the second location;
using the detector at the second location to make said one or more further measurements;
choosing a third location on the path from which one or more yet further of the measurements are to be made by the detector, the third location being displaced from the straight line passing through both the first and second locations;
moving the detector to the third location;
using the detector at the third location to make the one or more yet further measurements;
calculating at least one other location based on one or more of the previous measurements made by the detector from which one or more additional of the measurements are to be made;
moving the detector to the at least one calculated other location;
using the detector at the at least one calculated other location to make the one or more additional measurements; and
using measurements made by the detector of the one or more characteristics of the jamming signal to determine a location of the source of the jamming signal.
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Accused Products
Abstract
A ground-based source of a jamming signal capable of disrupting a GNSS satellite-based navigation system, for example a GPS jammer, is located with a detector carried by a suitable platform, for example an airborne UAV or missile. The detector, when the platform is at a first location, measures a characteristic of the jamming signal. The platform and its detector are then moved to a chosen second location, from which a further measurement of the jamming signal is made. The measurements made by the detector are then used to determine the location of the source of the jamming signal.
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Citations
17 Claims
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1. A method of locating a ground-based source of a jamming signal capable of disrupting a satellite-based navigation system, wherein the method comprises using a detector at locations on a path to make measurements of one or more characteristics of the jamming signal, the method comprising the following steps:
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using the detector at a first location on the path to make one or more of the measurements; choosing a second location on the path from which one or more further of the measurements are to be made by the detector; moving the detector from the first location to the second location; using the detector at the second location to make said one or more further measurements; choosing a third location on the path from which one or more yet further of the measurements are to be made by the detector, the third location being displaced from the straight line passing through both the first and second locations; moving the detector to the third location; using the detector at the third location to make the one or more yet further measurements; calculating at least one other location based on one or more of the previous measurements made by the detector from which one or more additional of the measurements are to be made; moving the detector to the at least one calculated other location; using the detector at the at least one calculated other location to make the one or more additional measurements; and using measurements made by the detector of the one or more characteristics of the jamming signal to determine a location of the source of the jamming signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17)
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15. An apparatus comprising:
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a detector for measuring one or more characteristics of a jamming signal capable of disrupting a satellite-based navigation system; a processor; and a memory storing a jammer location and likelihood computation module and a fly-path computation and prediction module, the processor when executing the jammer location and likelihood module and the fly-path computation and prediction module is configured to; choose a fly-path comprising a first location, a second location, a third location and at least one further location; receive detection results from the detector from the first location, the second location, the third location and the at least one further location, the detection results indicating measurements of the one or more characteristics of the jamming signal at respective locations, wherein the at least one further location is calculated based one or more previous detection results; and determine a location of a ground-based source of the jamming signal from the detection results.
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16. An airborne vehicle comprising
a detector for measuring one or more characteristics of a jamming signal capable of disrupting a satellite-based navigation system; -
a processor; and a memory storing a jammer location and likelihood computation module and a fly-path computation and prediction module, the processor when executing the jammer location and likelihood module and the fly-path computation and prediction module is configured to; choose a fly-path comprising a first location, a second location, a third location and at least one further location; receive detection results from the detector from the first location, the second location, the third location and the at least one further location, the detection results indicating measurements of the one or more characteristics of the jamming signal at respective locations, wherein the at least one further location is calculated based one or more previous detection results; and
determine a location of a ground-based source of the jamming signal from the detection results.
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Specification