Method and device for detecting and locating people buried E. G. under an avalanche
First Claim
1. A method for guiding a rescue worker, carrying a radio receiver device for receiving signals at a standardized frequency, searching for an avalanche victim wearing a radio transmitter device continually transmitting signals in the form of electromagnetic waves at said standardized frequency, said signals received by said receiver device being analyzed by a processor coupled to receiving means of said receiver device, the method comprising successively:
- a detection phase consisting in detecting presence of the transmitter device worn by the victim, during which the rescue worker methodically covers the zone snowed in by the avalanche with said receiver device, this phase comprising comparing amplitude of signals received by the receiver device with a lower threshold, and controlling a first signaling means to indicate to the rescue worker whether or not the signals received exceeds the lower threshold,a directional search phase consisting of a directional searching for the victim, during which the rescue worker rotates the receiver device about a substantially vertical axis, this phase comprising measuring the amplitudes of the signals received by said receiver device in at least two directions, comparing said amplitudes with one another to determine a victim direction, and controlling a second signaling means to indicate to the rescue worker whether or not said receiver device is in a victim direction, in order to indicate the rescue worker whether or not he is headed in the victim direction,an advancing phase consisting in the rescue worker advancing towards the victim, comprising measuring the amplitudes of the signals received to determine whether or not said receiver device is in said victim direction, while controlling said second signaling means, comparing the amplitude of the signal received with an upper threshold, and controlling a third signaling means to indicate the rescue worker whether or not the signal received exceeds the upper threshold.
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Accused Products
Abstract
To search for an avalanche victim wearing a radio transmitter continually transmitting at a standardized frequency, the method according to the invention comprises: a victim detection phase during which a rescue worker wearing a receiver methodically covers the zone snowed in by the avalanche during which time the receiver detects the moments when the amplitude of the signal received is greater than a lower threshold, a phase of directional search for the victim during which the rescue worker rotates with the receiver while the latter detects the moments when the amplitude of the signal received is at the maximum, and signals these moments to the rescue worker who is then pointed towards the victim, a phase during which the rescue worker advances towards the victim, during which the receiver checks that the amplitude of the signal remains at the maximum, and detects the moments when the amplitude of the signal received exceeds an upper threshold.
36 Citations
20 Claims
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1. A method for guiding a rescue worker, carrying a radio receiver device for receiving signals at a standardized frequency, searching for an avalanche victim wearing a radio transmitter device continually transmitting signals in the form of electromagnetic waves at said standardized frequency, said signals received by said receiver device being analyzed by a processor coupled to receiving means of said receiver device, the method comprising successively:
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a detection phase consisting in detecting presence of the transmitter device worn by the victim, during which the rescue worker methodically covers the zone snowed in by the avalanche with said receiver device, this phase comprising comparing amplitude of signals received by the receiver device with a lower threshold, and controlling a first signaling means to indicate to the rescue worker whether or not the signals received exceeds the lower threshold, a directional search phase consisting of a directional searching for the victim, during which the rescue worker rotates the receiver device about a substantially vertical axis, this phase comprising measuring the amplitudes of the signals received by said receiver device in at least two directions, comparing said amplitudes with one another to determine a victim direction, and controlling a second signaling means to indicate to the rescue worker whether or not said receiver device is in a victim direction, in order to indicate the rescue worker whether or not he is headed in the victim direction, an advancing phase consisting in the rescue worker advancing towards the victim, comprising measuring the amplitudes of the signals received to determine whether or not said receiver device is in said victim direction, while controlling said second signaling means, comparing the amplitude of the signal received with an upper threshold, and controlling a third signaling means to indicate the rescue worker whether or not the signal received exceeds the upper threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. A device for guiding a rescue worker towards an avalanche victim, comprising:
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a transmitter device worn by the avalanche victim and comprising a transmitter module transmitting signals at the standardized frequency, a receiver device carried by the rescue worker and comprising a receiver module designed to receive the signals transmitted by the transmitter device worn by the victim, signaling means and a computing and control module connected to an output of the receiver module and to said signaling means in order to control the signaling means as a function of amplitude of the signals received by the receiver module, said computing and control module comprising means for measuring the amplitude of the signals received, means for comparing said amplitude with predetermined lower and higher thresholds and for controlling the signaling means to indicate a value of said amplitude with respect to said thresholds, means for determining a victim direction using at least two amplitudes of the signals received in two respective directions and for controlling said signaling means to indicate whether or not said receiver device is in the victim direction. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification