Apparatus and method for determining signal quality in a geolocation system
First Claim
1. In a geolocation system for determining a geolocation of a target emitter, a method for determining the geolocation comprising:
- receiving a signal transmitted from the target emitter at each one of a plurality of sensors;
determining whether signals received at n sensors, from among the plurality of sensors, have a signal parameter that satisfies an associated threshold values, wherein the signal parameter comprises one or more of a signal amplitude, a signal bandwidth, a signal-to-noise ratio and a stare period, the associated threshold value selected to minimize a lower bound of a variance estimate according to a Cramer Rao equation;
if signals received at n sensors satisfy the threshold value, commanding m of the n sensors to transmit one or both of the signal received thereat or information related to the signal received thereat to a processor;
at the processor, determining time difference estimates for the m received signals; and
determining the geolocation of the target emitter from the time difference estimates.
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Accused Products
Abstract
In a geolocation system for determining a geolocation of a target emitter, a method for determining the geolocation. The method comprises receiving a signal transmitted from the target emitter at each one of a plurality of sensors; determining whether signals received at n sensors, from among the plurality of sensors, satisfy one or more threshold values related to a condition of the received signals; if signals received at n sensors satisfy the threshold value, commanding m of the n sensors to transmit the signal received thereat or information related to the signal received thereat to a processor; at the processor, determining time difference estimates for the m received signals and determining the geolocation of the target emitter from the time difference estimates.
10 Citations
16 Claims
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1. In a geolocation system for determining a geolocation of a target emitter, a method for determining the geolocation comprising:
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receiving a signal transmitted from the target emitter at each one of a plurality of sensors; determining whether signals received at n sensors, from among the plurality of sensors, have a signal parameter that satisfies an associated threshold values, wherein the signal parameter comprises one or more of a signal amplitude, a signal bandwidth, a signal-to-noise ratio and a stare period, the associated threshold value selected to minimize a lower bound of a variance estimate according to a Cramer Rao equation; if signals received at n sensors satisfy the threshold value, commanding m of the n sensors to transmit one or both of the signal received thereat or information related to the signal received thereat to a processor; at the processor, determining time difference estimates for the m received signals; and determining the geolocation of the target emitter from the time difference estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a geolocation system for determining a geolocation of a target emitter, a method for determining the geolocation comprising:
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receiving a signal transmitted from the target emitter at each one of a plurality of sensors; determining whether signals received at n sensors, from among the plurality of sensors, satisfy one or more threshold values related to a condition of the received signals; if signals received at n sensors satisfy the threshold value, commanding m of the n sensors to transmit one or both of the signal received thereat or information related to the signal received thereat to a processor; at the processor, determining time difference estimates for the m received signals; determining the geolocation of the target emitter from the time difference estimates; and wherein the step of determining whether n of the received signals satisfy one or more threshold values further comprises, transmitting data packets from each of the plurality of sensors to the processor, each data packet representing one of the received signals; at the processor receiving the data packets and determining a Fourier transform of each data packet; and if the Fourier transform indicates that n of the received signals satisfy one or more threshold values related to the condition of the received signal, then commanding m of the n sensors to transmit the signal received thereat or information related to the signal received thereat to the processor. - View Dependent Claims (15, 16)
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Specification