Classifications

• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
  • A63B29/00—Apparatus for mountaineering
  • A63B29/02—Mountain guy-ropes or accessories, e.g. avalanche ropes; Means for indicating the location of accidentally buried, e.g. snow-buried, persons
  • A63B29/021—Means for indicating the location of accidentally buried, e.g. snow-buried, persons

Definitions

• the invention relates to a search device, in particular an avalanche victim search device (LVS), a method for determining a movement state of such a search device, a method for transmitting a transmission signal with such a search device and an antenna unit for a short-range radio system.
• a search device in particular an avalanche victim search device (LVS)
• LVS avalanche victim search device
• a method for determining a movement state of such a search device a method for transmitting a transmission signal with such a search device and an antenna unit for a short-range radio system.
• the invention relates in particular to search devices which comprise a transmitting / receiving device with which a transmission signal can be transmitted in normal operation (transmission). Due to this transmission signal, the device or the user who carries the device with him, be located in case that the user and his device is buried by an avalanche. A rescuer who also carries such a device can switch his device to "search mode" (search mode) in the event of an avalanche, so that the transmitted signal from the victim's device can be received and the victim's device can be located on the basis of this signal.
• search mode search mode
• the above illustration shows the result of the frequency analysis (amplitude spectrum).
• the associated acceleration signal was recorded on a subject who lying on the ground, moving as little as possible and having put a prototype avalanche transceiver with accelerometer on the right thigh.
• the acceleration sensor signals were recorded separately for each state. Thereafter, these were assembled into a state sequence and passed as an input to a simulation of the described method.
• the level of the "determining average value of the absolute value signal" which determines the state determination differs in each case by about 20 dB in the three states of interest. This can be a clear and reliable distinction of the defined states are performed.
• Known avalanche beacons have the ability to send and receive the locator pulses. However, the transmission of any information between two such search devices using these locating pulses is only possible to a limited extent. There is no known search device that allows efficient communication between such search devices.
• Short Range Devices are short-range radio systems that can be operated license-free.
• the approved frequency bands suitable for the operation of the LVS data channel acc. Chapter 3 are 868 MHz in Europe and 902 MHz ... 915 MHz in the USA / Canada.
• With an antenna that can be used for both frequency ranges there is no need to distinguish between device variants for the European and American markets become. Thus, the additional costs for production and logistics can be avoided.
• Such an antenna could also be used for other SRD applications apart from the radio application in the LVS.
• a network analyzer was used to record the input reflection factor S 11 at the coupling point in the range 700 MHz to 1.2 GHz (see below).
• the two markers are set to the two desired frequencies 868 MHz and 915 MHz.
• a search device transmits its locating pulses without taking into account the locating pulses of other devices, so that the transmission pulses of the 457 kHz transceiver signal from several transceivers can temporally overlap.
• the search of several persons with avalanche transceivers that are spilled is therefore a difficult task according to the current state of the art. In most cases, it will only succeed with targeted strategies by trained rescuers. If the pulses of several avalanche transceivers overlap, they can hardly or no longer be distinguished from the other search devices.
• the search device has corresponding coordination means for coordinating a time position of the transmission pulses of the own transmission signal with a temporal position of the transmission pulses of the other search device.
• the pulses (transmit pulses) of the 457 kHz transmit-LVS signal have a period of the order of 1 second in known transceivers (see ETS 300718).
• ETS 300718 the direction indicator is only updated approximately every second. Leads the User with his avalanche turn through, this can temporarily indicate an incorrect search direction. This may hinder the efficient search of victims. Compass-based interpolation of the search direction indicator can mitigate this problem.
• the presented facility was implemented and tested with a prototype.
• the test results show that the accuracy achieved is sufficient for the implementation of the method described.
• a simple and intuitive main switch is designed to facilitate efficient operation and to erroneously minimize incorrect switch settings.
• the slider In the OFF state, the slider is positioned on the left side.
• the slide (4) before (signal element) is a part of the slide (4) before (signal element), so that the user of the WMS this part in a disturbing way reminds that the device is not turned on.
• the switch can be set to SEND. This could be beneficial if someone gets into an avalanche but has not turned on their device yet. As a result of the turbulence during an avalanche release sufficiently high pressures on the protruding slide part, the device could still be turned on.
• This switch position is the most common condition when using the WMS.
• SEND position a pulsing LED indicates that the device is activated.
• the light from the LED is displayed to the outside via the release (3). Therefore, the release (3) is transparent / semitransparent designed.
• the switch can be set to SEARCH. If, however, SEND is set to OFF, the release (2) must also be pressed so that the avalanche safety device can not be switched off by mistake.
• a part of the slide (4) is analogous to the position OFF. (Signal element) This should alert the user that the device is not in the usual SEND position.
• the SEARCH position can be set to SEND by pressing the protruding part (4) in the direction in which the slider moves.

Landscapes

• Health & Medical Sciences (AREA)
• Pulmonology (AREA)
• General Health & Medical Sciences (AREA)
• Physical Education & Sports Medicine (AREA)
• Alarm Systems (AREA)
• Mobile Radio Communication Systems (AREA)
• Radar Systems Or Details Thereof (AREA)
• Eye Examination Apparatus (AREA)
• Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

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Cited By (2)

Citations (15)

• 2005
  • 2005-11-14 EP EP05405632A patent/EP1785168A1/fr not_active Withdrawn
• 2006
  • 2006-11-14 DE DE502006005965T patent/DE502006005965D1/de active Active
  • 2006-11-14 AT AT06405480T patent/ATE455583T1/de active

Patent Citations (15)

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