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WO2011078679A1 - Emetteur d'onde radioélectrique - Google Patents

Emetteur d'onde radioélectrique Download PDF

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Publication number
WO2011078679A1
WO2011078679A1 PCT/NL2010/050890 NL2010050890W WO2011078679A1 WO 2011078679 A1 WO2011078679 A1 WO 2011078679A1 NL 2010050890 W NL2010050890 W NL 2010050890W WO 2011078679 A1 WO2011078679 A1 WO 2011078679A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio
message
data
carrier frequency
radio wave
Prior art date
Application number
PCT/NL2010/050890
Other languages
English (en)
Inventor
Eric Ewout Geelhuysen
Antonius Alphonsus Gerardus Van Buul
Hendrik Jan Van Der Neut
Bart Christiaan Lugtmeijer
Original Assignee
Flister B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flister B.V. filed Critical Flister B.V.
Publication of WO2011078679A1 publication Critical patent/WO2011078679A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas

Definitions

  • the invention relates to a radio wave transmitter for transmitting alarm signals to radio wave receivers, an emergency vehicle comprising such radio wave transmitter a wireless communication device and a method for transmitting alarm signals to radio wave receivers in an area.
  • different stations may transmit at roughly 200 - 400 different frequencies within this band.
  • An emergency vehicle approaching a traffic situation would want to provide alarm signals to drivers of different vehicles, each of which may have his of her radio tuned to a different frequency.
  • a warning would have to be transmitted at each respective frequency within seconds or an even shorter time frame.
  • hundreds of possible frequencies would have to be covered by warning device virtually simultaneously.
  • a signal would have to be transmitted for a sufficient long time to allow the driver to be aware of the situation, which practical implementations have appeared to fail for the reasons cited above.
  • the invention intends to provide a workable warning for drivers that an emergency vehicle is within vicinity.
  • the radio wave transmitter in accordance with an embodiment of the invention comprised the features of claim 1 .
  • a transmitter module is provided for transmitting a radio signal at at least one carrier frequency.
  • a control module is provided for controlling the transmitter module.
  • the control module comprises a memory in which data can be or is stored providing information about a radio broadcasting spectrum at a certain position, respectively in a certain (coverage) area.
  • the control module can now specifically control the transmitter module so as to transmit one or more radio signals at the specific carrier frequencies at which radio stations are available at that specific position resp. in that specific area.
  • the radio wave transmitter does not need to transmit in a whole frequency band, such as a whole FM band, but in stead thereof may be operated so as to transmit a radio signal at the specific carrier frequencies at which radio stations are active at that specific position.
  • the control module further comprises a position data input for entry of a position data from a position measurement system, the position measurement system to measure a position of the radio wave transmitter and/or the vehicle to which it is attached, the control module being arranged to take account of the position data when determining the at least one carrier frequency.
  • position data such as derived from a GPS position measurement system or other position measurement system
  • a larger region may be covered which allows the radio wave transmitter, or the emergency vehicle comprising it, to move throughout the region, the position data from the position measurement system thereby providing information on the actual position, and the control module to take account of the position when determining the at least one carrier frequency, so as to take account of differences in the frequency spectrum at different positions in the region.
  • the radio broadcasting data comprises at least one of antenna position, antenna height, and transmission power of radio broadcasting
  • control module is arranged to determine a radio broadcasting spectrum at the position identified by the position data, from the radio broadcasting data, and to control the transmitter module in accordance with the determined radio broadcasting spectrum. From data such as antenna position, antenna height and transmission power of one or more radio broadcasting transmitters, a radio spectrum at a certain position may be determined. The transmitter module may then transmit the signal in accordance with the determined spectrum so as to specifically transmit the alarm signals at the frequencies of radio stations that provide, according to the calculation, a usable signal strength at the determined position. As a result, using only a limited amount of data, namely characteristics of radio transmitters that transmit into an area of interest.
  • a transmission power level of the radio signal as transmitted by the radio wave transmitter may be kept at a substantially constant power level (i.e. for example independent of a power level of the radio stations in that area).
  • the transmission power level may be set in dependency of a velocity of the emergency vehicle, for example linearly or quadratically dependent on the velocity, or in two or more discrete steps.
  • a first power level is employed in a first velocity range (for example 0 - 70 kilometers per hour which speeds may be driven by the emergency vehicle in urban area's) while a second power level is employed in a second velocity range (for example above 70 kilometers per hour which speeds may be driven by the emergency vehicle outside urban area's, so as to warn a driver more early thereby taking account of higher driving velocities.
  • a data message may be generated and transmitted with the radio signal for one or each of the carrier frequencies.
  • the data message may for example comprise an RDS (radio data system) message thereby transmitting e.g. a text message to be displayed on a display of the radio wave receiver, a code for stopping a play-back (such as a CD play-back or a play-back of a computer music file), or an RDS message to put the radio wave receiver in an emergency mode in which normal music or audio reproduction is interrupted.
  • the RDS message may comprise a program information (PI) code, the message generator preferably being arranged to set for each of the carrier frequencies the program information code to a data value which is the same as a program information code broadcasted at that carrier frequency (i.e.
  • a radio receiver that receives the signal transmitted by the radio wave transmitter, may be frequency locked and thereby prevented from skipping to another carrier frequency at which the same program (having the same program information (PI) code, is transmitted, in an attempt to keep tracing the program material, as this could impede a transmission of a warning to a user, such as a driver of a vehicle.
  • the data may also comprise a TMC (traffic management control) message thereby allowing to provide a message to e.g.
  • a navigation system which may apply the TMC message to provide a warning on a display of the navigation system and/or to provide the user with router direction so as to direct it away from the intended route of the emergency vehicle.
  • the same or different data messages may be transmitted via each carrier frequency.
  • the navigation device commonly requires a same TMC message to be received three times.
  • the message generator may be arranged to transmit the TMC message at least 3 times per second at each carrier frequency, so that successive TMC messages are received shortly after each other and taken into account by the navigation device quickly.
  • the TMC message may comprise a position and/or a heading speed of an emergency vehicle that carries the radio wave transmitter, to enable the position and/or direction of the emergency vehicle to be displayed on a display of the driver's navigation system.
  • the driver may be informed about the position and/or direction of the emergency vehicle, even if the driver may not yet be able to see the emergency vehicle itself.
  • the radio wave transmitter may be arranged to transmit the data message at a modulation level or signal strength that exceeds a modulation level or signal strength of a data message broadcasted at that carrier frequency.
  • the radio wave transmitter may transmit a signal at each of those frequencies simultaneously, however, depending on the hardware of the radio wave transmitter, it may also be possible that a sequential transmission of the carrier frequencies or of subsets of the carrier frequencies are provided, which may for example be advantageous in a situation where more transmissions at different carrier frequencies are required than the amount of carrier frequencies that can be transmitted at a same time by the radio wave transmitter.
  • a warning tone signal can be transmitted (e.g. modulated onto the carrier) so as to alarm a driver of the vehicle in question.
  • the radio wave transmitter may comprise a tachometer input for receiving tachometer data providing information about a speed of the vehicle to which the radio wave transmitter is attached, the control module of the radio wave transmitter thereby being arranged to control an output power of the transmitter module in accordance with the received tachometer data so as to adapt the output power to the speed of the vehicle: if the vehicle is driving at a higher speed, drivers in a larger range are to be alarmed, hence requiring a higher transmission power.
  • the radio signal transmitted by the radio wave transmitter will, within an area, e.g.
  • an area surrounding the emergency vehicle to which the radio wave transmitter is mounted transmit the radio signal at a carrier frequency which may correspond to a frequency of a public radio station and at a power level with which the public radio station transmission will be overridden within that area, thereby effectively "pushing away" the public radio station in the area.
  • a listener to the radio station, including drivers of vehicles, will, in stead of receiving the public radio station, be warned by the alarm signal transmitted by the radio wave transmitter.
  • the data message comprises an activation message (e.g. an RDS message or other signal) arranged to activate a wireless communication device so as to transmit a warning signal.
  • an activation message e.g. an RDS message or other signal
  • it may be highly relevant to know if there are any persons in a certain area, for example in case of avalanches, fires, earthquakes, etc, where a localization and rescue of survivors may be needed.
  • many wireless communication devices are provided with a radio receiver (e.g. a radio broadcast receiver), e.g to enable a user to listen to radio program material and/or to receive data messages, such as TMC messages that are transmitted with radio signals in the radio broadcasting frequency band.
  • the activation message may alternatively or additionally be transmitted in any other suitable form, such as a pilot tone.
  • the wireless communication devices may be arranged to be activated by the activation message so as to transmit the warning signal.
  • the warning signals thus transmitted by the wireless telecommunication devices (such as mobile telephones, personal digital assistants, smart-phones, etc) may enable to more quickly localize any potential survivors in the area of interest.
  • the warning signal may comprise a radio broadcasting band signal (such as an FM or AM signal), an avalanche transponder warning signal, a wireless telecommunication network signal (such as GSM signal, CDMA, W-CDMA or UMTS signal), a mobile data communication network signal (such as a Bluetooth signal, a wireless local area network signal, etc.).
  • the warning signal may comprise a position so as to allow to determine where possible survivors can be found with a high likelihood.
  • the radio wave transmitter may further be arranged to receive the warning signal and provide (data enabling) a display of presence and/or position of the wireless communication device to a rescuer.
  • the invention further comprises a wireless communication device having a radio frequency receiver arranged for receiving a radio broadcast signal, and a warning signal generator arranged for transmitting a warning signal to inform a rescue worker about at least one of a presence, identity and position of the wireless communication device, the wireless communication device being arranged to transmit the warning signal upon receipt of an activation message by the radio frequency receiver.
  • the wireless communication device may be arranged to maintain the radio frequency receiver in an active or standby mode even when the wireless communication device is in a switched off mode, and to activate the warning signal generator upon receipt of the activation message, so that, even when the mobile communication device is switched off, it may be activated to transmit the warning signal.
  • the wireless communication device may further comprise a position measurement device for measuring a position of the wireless communication device, a memory for storing a most recently measured position, the wireless communication device being arranged for, if a position can be measured by the position measurement device, storing the measured position in the memory, and if no usable position measurement can be performed, keeping a previously measured position in the memory, the warning signal generator being arranged for receiving the measured position as stored in the memory and transmitting the warning signal comprising the measured position as stored in the memory.
  • a position measurement for measuring a position of the wireless communication device
  • a memory for storing a most recently measured position
  • the wireless communication device being arranged for, if a position can be measured by the position measurement device, storing the measured position in the memory, and if no usable position measurement can be performed, keeping a previously measured position in the memory
  • the warning signal generator being arranged for receiving the measured position as stored in the memory and transmitting the warning signal comprising the measured position as stored in the memory.
  • the radio frequency receiver and warning signal generator may be comprised in a frequency modulation or amplitude modulation transceiver, such as a radio transceiver integrated circuit, e.g an FM transceiver..
  • a frequency modulation or amplitude modulation transceiver such as a radio transceiver integrated circuit, e.g an FM transceiver.
  • the invention further comprises an emergency vehicle comprising the radio wave transmitter according to the invention.
  • the invention comprises a method for transmitting alarm signals to radio wave receivers in accordance with claim 13.
  • similar advantages and effects may be achieved as with the radio wave transmitter.
  • similar preferred embodiments as described above with reference to the radio wave transmitter according to the invention are also applicable to the method according to the invention, thereby achieving same or similar effects.
  • Fig.1 depicts a highly schematic block diagram of a radio wave transmitter according to the invention
  • Fig. 2 depicts a highly schematic block diagram of control module of the radio wave transmitter according to fig. 1 ;
  • Fig. 3 depicts a table based on which an embodiment of a memory contents in a accordance with embodiments of the invention will be explained
  • Fig. 4 depicts radio broadcasting transmitters in a region based on which an aspect of the invention will be explained, and
  • Fig. 5 schematically depicts a. wireless communication device in accordance with an embodiment of the invention.
  • Fig. 1 depicts a block diagram of a radio wave transmitter comprising a position measurement module PM as a GPS receiver, a control module such as a microprocessor based control, a transmitter module TM comprising a radio wave transmitter, and an antenna AN for transmitting the radio signal as generated by the transmitter module into an area.
  • the position measurement system PM provides at an output thereof position data in the form of any suitable signal, such as a digital data signal, which is transmitted by any suitable means, such as a data bus, a direct data connection, wireless transmission, serial or parallel electric data connection to the control module CM.
  • the control module CM comprises any suitable control device, such as a microprocessor, microcontroller, programmable integrated circuit, programmable logic circuit (PLC), etc and a memory, referred to in fig. 2 as control device CD and memory MM.
  • the control module is connected to the transmitter via any suitable connection including analogue, digital, etc the transmitter in response to a control signal from the control module generating a radio signal at the carrier frequencies in question to be transmitted via the antenna AN.
  • the control module CM comprises a memory MM, the memory for storage of radio broadcasting data e.g. related to a region. Making use of the data in the memory, the control module is able to determine at which frequencies radio stations will be active in the region in question.
  • the radio wave transmitter may according to an aspect of the invention, transmit the alarm signals in an area specifically at the frequencies at which, in that area, radio stations are transmitting, hence the frequencies at which radio wave receivers will be turned in that area.
  • the transmitter will transmit the radio signal with a transmission power that is sufficient to overrule the radio station at those frequencies in an area of several tenths to several hundreds of meters around, preferably in front of the emergency vehicle.
  • a transmission power of in general 100 milliWatt per carrier will be sufficient, however strongly depending on the local field strength of the radio station in question.
  • the position of the may be measured periodically or constantly so that, when the vehicle moves, the required carrier frequencies and the corresponding transmission powers may be determined periodically, so as to adapt them to the radio spectrum in situ.
  • the carrier frequencies and corresponding transmission powers may thus change dynamically as the position changes.
  • several techniques may be used. A first example will be described with reference to fig. 3.
  • Fig. 3 depicts a table in which channels in the radio frequency spectrum are set out against a plurality of different regions, each region being referred to by a letter A, B, C, D etc.
  • the channels at which a radio transmission of a radio station may take place are referred to by respective numbers 1 , 2, 3, etc.
  • transmission of radio stations takes place at channels 1 , 4 and 8
  • transmission takes place at channels 2 and 4, etc.
  • the measurement of the position will allow the control module to define in which zone the vehicle is at present, thereby allowing to look up the corresponding radio stations in a table in accordance with fig. 3.
  • the control module may now control the transmission module to transmit at carrier frequencies corresponding to the channels retrieved from the table.
  • Fig. 4 schematically depicts a map of a region in which radio broadcasting transmitters RB1 , RB2, RB3 and RB4 are located.
  • Each of the radio broadcasting transmitters transmits radio stations each at a carrier frequency and each having a particular transmission power.
  • different carrier frequencies are applied by different radio broadcasting transmitters RB1 , RB2, RB3, RB4, however, it may also be the case that the same or partly the same carrier frequencies are applied.
  • the positions, antenna height and transmission power of the radio broadcasting transmitters are stored, possibly in
  • control module calculates a to be expected spectrum at each position within reach of one or more of the radio broadcasting transmitters RB1 - RB4.
  • Radio broadcasting transmitter RB1 transmits some radio stations which are receivable in a range indicated by A, while also some stations are transmitted at a higher transmission power and being able to be received in the range A1 .
  • the radio stations transmitted by radio broadcasting transmitter RB2 are receivable in range B and the radio stations transmitted by radio broadcasting transmitter RB3 and RB4 are receivable in the ranges C and D
  • radio stations are received from radio broadcasting transmitter RB3 and RB4, while also some stations are received from radio broadcasting transmitter RB1 .
  • the control module may now determine the corresponding frequencies that are available at the position P, and the corresponding signal power at each of those frequencies, from data such as the transmission power, antenna height and distance towards the respective radio broadcasting transmitters, and control the transmitter module to transmit at those
  • a transmission power at each of those frequencies is adapted to a signal strength of the radio broadcasting at the particular position P as obtained from the calculation.
  • a message such as an RDS message or TMC message may be generated by e.g. a message generator MG of the control module CM, and transmitted at the carrier frequencies for reception by the radio wave receivers.
  • a warning tone such as a siren may be generated and transmitted to alert drivers of vehicles.
  • speech recorded via a microphone may be transmitted to the drivers by modulating it onto one or more of the carrier frequencies.
  • a transmission power of the radio wave transmitter may be set in accordance with a speed of the emergency vehicle, speed information being obtained from e.g. a tachometer of the vehicle. Alternatively, a speed information may be derived from a rate of change of position data obtained from the position measurement system.
  • the RDS message may comprise a program information code, the message generator preferably being arranged to set for each of the carrier frequencies the program information code to a data value which is the same as a program information code broadcasted at that carrier frequency,
  • a radio receiver that receives the signal transmitted by the radio wave transmitter, may be frequency locked and thereby prevented from skipping to another carrier frequency at which the same program (having the same program information (PI) code, is transmitted, in an attempt to keep tracing the program material, as this could impede a transmission of a warning to a user, such a s driver of a vehicle.
  • the navigation device commonly requires a same TMC message to be received three times.
  • the message generator may be arranged to transmit the TMC message at least 3 times per second (e.g. between 3 and 6 times per second) at each carrier frequency, so that successive TMC messages are received shortly after each other and taken into account by the navigation device quickly.
  • the TMC message may comprise a position and/or a heading speed of an emergency vehicle that carries the radio wave transmitter, so that the position and direction of the emergency vehicle can be displayed on a display of the driver's navigation system. As a result, the driver may be informed about the position of the emergency vehicle, even if the driver may even not yet be able to see the emergency vehicle itself,
  • the radio wave transmitter may be arranged to transmit the data message at a modulation level or signal strength that exceeds a modulation level or signal strength of a data message broadcasted at that carrier frequency.
  • the data message comprises an activation message (e.g. an RDS message or other signal) arranged to activate a wireless communication device so as to transmit a warning signal.
  • an activation message e.g. an RDS message or other signal
  • many wireless communication devices are provided with a radio receiver, e.g to enable a user to listen to radio program material and. or to receive data messages, such as TMC messages that are transmitted with radio signals in the radio broadcasting frequency band.
  • the wireless communication devices may be arranged to be activated by the activation message so as to transmit the warning signal.
  • the warning signals thus transmitted by the wireless telecommunication devices (such as mobile telephones, personal digital assistants, smart-phones, etc) may enable to more quickly localize any potential survivors in the area of interest.
  • the warning signal may comprise a radio broadcasting band signal (such as an FM or AM signal), an avalanche transponder warning signal, a wireless telecommunication network signal (such as GSM signal, CDMA, W-CDMA or UMTS signal), a mobile data communication network signal (such as a
  • the warning signal may comprise a position so as to allow to determine where possible survivors can be found with a high likelihood.
  • Fig. 5 schematically depicts two wireless communication devices WCD each having a radio frequency receiver RFR arranged for receiving (e.g. via antenna ANT) a radio broadcast signal RBS from an emergency vehicle EV, and a warning signal generator WSG arranged for transmitting (e.g. via antenna ANT) a warning signal to inform a rescue worker about at least one of a presence, identity and position of the wireless communication device WCD, the wireless communication device being arranged to transmit the warning signal WS (e.g. omni-directionally) upon receipt of an activation message by the radio frequency receiver RFR.
  • the Emergency vehicle may be provided with the above described radio wave transmitter arranged to transmit the radio broadcasting signal RBS and activation signal AS (or any other suitable transmitter arranged to transmit such activation signal).
  • the wireless communication device WCD may be arranged to maintain the radio frequency receiver in an active mode even when the wireless communication device is in a switched off mode, and to activate the warning signal generator upon receipt of the activation message, so that, even when the mobile communication device is switched off, it may be activated to transmit the warning signal if needed.
  • communication networks such as mobile telephony networks may break down, and receipt of signals enabling the wireless communication device to perform a position measurement (e.g. GPS signals or mobile telephone network signals) may be disrupted.
  • a position measurement e.g. GPS signals or mobile telephone network signals
  • the wireless communication device may not be able any more to determine its position, nor to transmit a signal via the regular communication means, such as the mobile telephone network.
  • radio broadcasting e.g. amplitude modulation, frequency modulation, e.g.
  • the wireless communication device may hence transmit the warning signal using AM or FM, for example within one of the above mentioned frequency bands, so that even when communication networks such as the mobile telephone network are disrupted, transmission of the warning signal from the wireless communication device, can take place.
  • the wireless communication device may store in a memory (not depicted) a last measured position, and transmit that position when transmitting the warning signal, so that position information of the wireless communication device may be provided even in a disruptive situation.
  • these items may be comprised in a low cost FM or AM transceiver, for example a radio transceiver integrated circuit that provides reception of radio signals for e.g. information and amusement purposes while also enabling to provide the functionality as described here at a minimum of extra cost.
  • the position information and/or other information may be comprised in the warning signal in the form of an RDS signal or using any other known modulation technique.
  • the warning signal may comprise a code, such as an RDS code that represents a warning message.
  • the warning signal may further comprise information that identifies the wireless communication device or its user, for example an international mobile subscriber identity (I MSI) code that contains a unique mobile telecommunication network subscriber identification, or a personal profile (comprising e.g. personal data, medical data, a personal identification number or other data).
  • I MSI international mobile subscriber identity
  • the personal profile may be stored in a memory in the wireless communication device, e.g. using encrypted storage so as to prevent unauthorized access to the personal data.
  • the warning signal may further or instead thereof comprise any other suitable warning signal, such as a pilot tone.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Traffic Control Systems (AREA)
  • Alarm Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un émetteur d'onde radioélectrique destiné à transmettre des signaux d'alarme à des récepteurs d'onde radioélectrique dans une zone, comprenant un module émetteur, agencé pour transmettre un signal radioélectrique sur au moins une fréquence porteuse. L'émetteur d'onde radioélectrique comprend en outre un module de commande destiné à commander le module émetteur. Le module de commande comprend une mémoire pour le stockage des données de radiodiffusion concernant la zone, le module de commande étant agencé pour déterminer la ou les fréquences porteuses provenant des données de radiodiffusion telles que stockées dans la mémoire et pour commander le module émetteur de façon à transmettre le signal radioélectrique sur la ou les fréquences porteuses. Fig. 1
PCT/NL2010/050890 2009-12-24 2010-12-24 Emetteur d'onde radioélectrique WO2011078679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2004016A NL2004016C2 (en) 2009-12-24 2009-12-24 Radio wave transmitter.
NL2004016 2009-12-24

Publications (1)

Publication Number Publication Date
WO2011078679A1 true WO2011078679A1 (fr) 2011-06-30

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NL (1) NL2004016C2 (fr)
WO (1) WO2011078679A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015117184A1 (fr) 2014-02-04 2015-08-13 Emergency Warning Systems Limited Système de communication d'informations

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918425A (en) * 1988-07-25 1990-04-17 Daniel E. Ely Monitoring and locating system for an object attached to a transponder monitored by a base station having an associated ID code
US5572201A (en) * 1994-08-05 1996-11-05 Federal Signal Corporation Alerting device and system for abnormal situations
WO2000050915A2 (fr) * 1999-02-25 2000-08-31 Global Trak, Inc. Telecommande declenchable
WO2002017269A1 (fr) * 2000-08-17 2002-02-28 Petards Civil Systems Limited Dispositif d'alarme
WO2002103653A1 (fr) * 2001-06-19 2002-12-27 Emergency Warning Systems Pty Ltd Appareil de diffusion d'un signal d'avertissement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918425A (en) * 1988-07-25 1990-04-17 Daniel E. Ely Monitoring and locating system for an object attached to a transponder monitored by a base station having an associated ID code
US5572201A (en) * 1994-08-05 1996-11-05 Federal Signal Corporation Alerting device and system for abnormal situations
WO2000050915A2 (fr) * 1999-02-25 2000-08-31 Global Trak, Inc. Telecommande declenchable
WO2002017269A1 (fr) * 2000-08-17 2002-02-28 Petards Civil Systems Limited Dispositif d'alarme
WO2002103653A1 (fr) * 2001-06-19 2002-12-27 Emergency Warning Systems Pty Ltd Appareil de diffusion d'un signal d'avertissement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015117184A1 (fr) 2014-02-04 2015-08-13 Emergency Warning Systems Limited Système de communication d'informations
CN105960766A (zh) * 2014-02-04 2016-09-21 紧急警告系统有限公司 信息通信系统
EP3103206A4 (fr) * 2014-02-04 2017-08-23 Emergency Warning Systems Limited Système de communication d'informations

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Publication number Publication date
NL2004016C2 (en) 2011-06-27

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