Method of and system for classifying emergency locating transmitters and emergency positions indicating radio beacons
First Claim
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1. A distress location transmitter, comprising:
- oscillator means for generating a carrier signal to be supplied to an antenna during a distress call;
means for modulating said carrier signal with a distress characteristic waveform; and
means for periodically disabling said modulating means at a predetermined rate corresponding to one of a plurality of classes of user for said distress location transmitter in providing a period of unmodulated carrier to identify said user class associated with said distress call.
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Abstract
During a distress call, a distress location transmitter 10 generates a high frequency carrier signal 40 that is modulated by a predetermined distress waveform characteristic 29. The classification of user associated with the distress call is identified by periodically interrupting modulation 42; user classification is determined by the repetition rate of the interruptions, the interruption periods, or both.
16 Citations
10 Claims
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1. A distress location transmitter, comprising:
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oscillator means for generating a carrier signal to be supplied to an antenna during a distress call; means for modulating said carrier signal with a distress characteristic waveform; and means for periodically disabling said modulating means at a predetermined rate corresponding to one of a plurality of classes of user for said distress location transmitter in providing a period of unmodulated carrier to identify said user class associated with said distress call. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A distress location transmitter, comprising:
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oscillator means for generating a carrier signal to be supplied to an antenna during a distress call; means for modulating said carrier signal with a distress waveform; means for enabling an output of said modulating means for a first period of time and for disabling said output for a second period of time; and means for controlling the time periods of said means for enabling and disabling in accordance with one of a plurality of classes of user for said distress location transmitter in providing a period of unmodulated carrier to identify said user class associated with said distress call.
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9. A method of identifying a user class associated with a distress call comprising a carrier signal transmitted at a predetermined frequency and modulated by a distress characteristic waveform, the method comprising the step of periodically interrupting modulation of said carrier signal at a predetermined repetition rate corresponding to one of a plurality of classes of user for said distress call in providing a period of unmodulated carrier to identify the user class.
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10. A method of identifying a user class associated with a distress call comprising a carrier signal transmitted at a predetermined frequency and modulated by a distress characteristic waveform, the method comprising the step of periodically interrupting modulation of said carrier signal for a predetermined time duration corresponding to one of a plurality of classes of user for said distress call in providing a period of unmodulated carrier to identify the user class.
Specification