REFERENCE BEACON IDENTIFICATION USING TRANSMISSION SEQUENCE CHARACTERISTICS
First Claim
1. A method of identifying a transmitter of a reference beacon signal for geolocation error correction, comprising:
- sequentially transmitting a plurality of reference beacon signal segments, each reference beacon signal segment being characterized by a frequency parameter and a time parameter, wherein at least one of the frequency and the time parameter of each reference beacon signal segment is determined in accordance with a reference beacon identifier.
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Abstract
A method and apparatus for encoding information in a reference beacon signal for use in a time-difference-of-arrival/frequency-difference-of-arrival (TDOA/FDOA) geolocation system. Information is encoded in the reference beacon signal using variations in the times and frequencies of sequential reference signal transmissions. The encoded information may include an identifier associated with the transmitter of the reference beacon signal. A geolocation system receiving the reference beacon signal can thus differentiate it from non-cooperative target emissions as well as from other reference beacon signals.
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Citations
30 Claims
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1. A method of identifying a transmitter of a reference beacon signal for geolocation error correction, comprising:
sequentially transmitting a plurality of reference beacon signal segments, each reference beacon signal segment being characterized by a frequency parameter and a time parameter, wherein at least one of the frequency and the time parameter of each reference beacon signal segment is determined in accordance with a reference beacon identifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for identifying a transmitter of a reference beacon signal for geolocation error correction, comprising:
means for sequentially transmitting a plurality of reference beacon signal segments, each reference beacon signal segment being characterized by a frequency parameter and a time parameter, wherein at least one of the frequency and the time parameter of each reference beacon signal segment is determined in accordance with a reference beacon identifier. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
Specification