EP0660285A1 - Procédé pour l'élévation de la sécurité contre les pertubations dans un système radio d'alarme - Google Patents

Procédé pour l'élévation de la sécurité contre les pertubations dans un système radio d'alarme Download PDF

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Publication number
EP0660285A1
EP0660285A1 EP94118445A EP94118445A EP0660285A1 EP 0660285 A1 EP0660285 A1 EP 0660285A1 EP 94118445 A EP94118445 A EP 94118445A EP 94118445 A EP94118445 A EP 94118445A EP 0660285 A1 EP0660285 A1 EP 0660285A1
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EP
European Patent Office
Prior art keywords
data telegram
central unit
data
unit
changed
Prior art date
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Application number
EP94118445A
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German (de)
English (en)
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EP0660285B1 (fr
Inventor
Horst Dipl.-Ing. Grundig E.M.V. Elsinger
Werner Dipl.-Ing. Grundig E.M.V. Haake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig AG
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Publication of EP0660285A1 publication Critical patent/EP0660285A1/fr
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/007—Details of data content structure of message packets; data protocols

Definitions

  • the invention relates to a method for increasing the interference immunity of a radio alarm system according to the preamble of claim 1.
  • Alarm systems have become a valuable aid when monitoring apartments or buildings. Fire, theft, burglary and robbery are reported without delay.
  • the individual components of an alarm system perform the following tasks: detection, evaluation and alarming. These three tasks are solved by different components of an alarm system.
  • An alarm is recognized by detectors (detectors), which have different sensors depending on the type of detector (e.g. fire, broken glass or water detector).
  • detectors detectors
  • the signals generated by one or more detectors are evaluated in a central unit. In the The central unit decides on the basis of the detector signals and additional status variables whether an alarm should occur. This can then be done by forwarding an alarm signal to the police or by activating acoustic and / or visual alarm devices (sirens, alarm lights, etc.).
  • a very high level of interference immunity of the alarm system is achieved by the line-based implementation, but very high expenditure is required, in particular when the line network is retrofitted.
  • radio alarm systems are increasingly being used, the components of which are connected via radio links.
  • These radio alarm systems consist of a central unit with a power supply, a radio receiver, an alarm device and outdoor units with a mains-independent power supply, a detector and a radio transmitter.
  • the outdoor units are connected to the central unit by sending data telegrams.
  • the data telegrams contain code numbers that uniquely identify the outdoor units. Depending on the number of bits used for this, more or fewer code numbers can be assigned.
  • the transmitters of the outdoor units only send data telegrams if the detectors determine a malfunction. These data telegrams are repeated at short intervals until the fault has been remedied.
  • the transmitters of the outdoor units can send special data telegrams as status messages at fixed time intervals. The data telegrams for status reporting are generated and emitted in the outdoor units at intervals of several hours, which means that the central unit can monitor the proper functioning of the outdoor units. To differentiate between the different types of data telegrams, additional bits can be added to the data telegrams.
  • a radio alarm system that is easy to install at a later date with increased interference immunity of the radio links is known from EP 0 293 627 A1 in which a radio transmission method for transmitting Information between a central unit and a number of outdoor units is described. The same radio frequency is used for bidirectional radio transmission. All outdoor units, which include the detectors as well as transmitters and receivers, are first checked at the same time as a sum check whether they have switched on their transmitter to transmit information. If at least one switched-on transmitter is recognized, the outdoor units are polled one after the other in a time-division multiplex procedure.
  • the outdoor units are assigned unique code numbers that are predefined or set using switches.
  • the code numbers are part of data telegrams that are exchanged between the central unit and the outdoor units.
  • the known radio alarm system has the disadvantage that malfunctions or alarm triggers can be caused from outside with corresponding technical devices but also with an identical external unit by trying out the possible code numbers.
  • suitable technical equipment it is also possible to wait for radio signals between the outdoor units and the central unit and to register them. The registered signals can then be sent out again by the technical equipment, whereby the radio alarm system can be manipulated.
  • the computing units have a memory in which the algorithmic function is stored. If an outdoor unit detects an alarm, it sends a data telegram to the central unit. The data telegram is processed in the central unit and a request signal is generated which causes the outdoor unit to repeat the data telegram. For this purpose, the request signal is subjected to the algorithmic function in the outdoor unit. The data telegram generated is sent to the central unit as a repeat signal. Since the same algorithmic function is present in the central unit, the same data telegram can be generated and stored in the central unit as is also generated in the external unit. The repeat signal sent by the outdoor unit is compared in accordance with the stored data telegram. A mismatch indicates an attempt to influence it, an alarm is not triggered.
  • a disadvantage of the radio alarm system known from DE 41 41 035 C1 is that both the central unit and the external units must have a transmitter and receiver, as a result of which the alarm system as a whole is complex and expensive.
  • the invention is therefore based on the object of specifying a method which enables a high level of interference immunity to be achieved in a radio alarm system with little implementation effort.
  • the advantage of the method according to the invention lies in particular in the fact that a radio alarm system operated according to this method has a high level of interference immunity of the radio connection between the outdoor units and the central unit, despite the low implementation effort.
  • the invention is explained in more detail below on the basis of an embodiment.
  • the single figure shows the basic structure of a radio alarm system operating according to the method according to the invention.
  • the radio alarm system has several outdoor units A1 to An and a central unit Z.
  • the external units A1 to An each have a detector D, a computing unit RA, a battery or a rechargeable battery B and a transmitter S.
  • the computing unit RA which can be formed, for example, by a microcomputer, evaluates the signals from the detector D and controls them respective outdoor unit.
  • the central unit comprises a receiver E, a computing unit RZ, an alarm device A and a power supply SV.
  • the computing unit RZ which can be formed, for example, by a microcomputer, evaluates the radio signals received from the associated outdoor units A1 to An and controls the central unit.
  • the data telegram consists of a characteristic identification part, which uniquely identifies each of the outdoor units A1 to An by a code number, and a change part, which is changed by the computing unit RA after each transmission of a data word in the respective outdoor unit A1 to An.
  • Each outdoor unit A1 to An is registered by the central unit Z by means of the initialization run. For this, the code number of the identification part is saved.
  • the second component of the data telegram is evaluated by the computing unit RZ.
  • the last used data telegram from the outdoor units A1 to An is thus known in the central unit Z. If another data telegram is sent later during normal operation, the changed part of the change is sent together with the identification part as a new data telegram. Since the data telegram last sent was evaluated in the central unit Z, the changed part of the change can be determined by the computing unit RZ, whereby the new data telegram is known in the central unit Z.
  • the determination of the change part in the central unit Z is possible since the same algorithm for changing the change part is present in the computing unit RZ as is present in the computing units RA of the outdoor units A1 to An.
  • the algorithm can be the same for all outdoor units A1 to An. When using different algorithms, there is an increase in interference immunity.
  • a correct evaluation and alarm message can take place or be suppressed by the alarm device A.
  • An identification of the type of the data telegram can be part of the identification part and can be identified there by means of additional bits. If the data telegram is a status message that - as mentioned at the beginning - is sent at certain intervals and the evaluation shows that the received data telegram does not match the expected data telegram, this indicates an attempt to cover up the unauthorized removal of an outdoor unit , an alarm is triggered.
  • the data telegram is the trigger message of a detector D and the evaluation results in a mismatch between the received data telegram and the expected data telegram, this indicates an attempt to trigger the alarm system without the presence of a corresponding dangerous situation; no alarm is triggered.
  • the disturbances described can be prevented if the computing unit RZ in the central unit not only determines the data telegram to be expected next for the outdoor units A1 to An, but at least one further data telegram. If several, eg a total of three data telegrams are determined in this way (the expected and two more), short-term reception disturbances will not cause false alarms if up to two previous data telegrams have not been received. In addition, it can be provided that if the received data telegram matches one of the other data telegrams, the further data telegram forms the basis for determining the next data telegram to be expected. This compensates for short-term disturbances that occur on the radio link.
  • the simplest algorithm for changing the change part is to increase or decrease a number forming the change part (e.g. binary number resulting from the bits used for the change part). Further algorithms are known per se and are described, for example, in the aforementioned German patent DE 41 41 035 C1.
  • the data telegrams can be changed, for example, by applying a polynomial to the data telegram in the outdoor units and the central unit.
  • the coefficients of the polynomial can be determined by a (pseudo) random process, which is defined in the same way in the respective outdoor unit and the central unit.
  • Further algorithms are also known per se for the direct change of a data telegram consisting only of the identification part and are described, for example, in the aforementioned DE 41 41 035 C1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
EP94118445A 1993-12-23 1994-11-24 Procédé pour l'élévation de la sécurité contre les pertubations dans un système radio d'alarme Expired - Lifetime EP0660285B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4344120 1993-12-23
DE4344120A DE4344120C1 (de) 1993-12-23 1993-12-23 Verfahren zur Erhöhung der Störsicherheit einer Funkalarmanlage

Publications (2)

Publication Number Publication Date
EP0660285A1 true EP0660285A1 (fr) 1995-06-28
EP0660285B1 EP0660285B1 (fr) 2000-02-02

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ID=6505963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118445A Expired - Lifetime EP0660285B1 (fr) 1993-12-23 1994-11-24 Procédé pour l'élévation de la sécurité contre les pertubations dans un système radio d'alarme

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Country Link
EP (1) EP0660285B1 (fr)
AT (1) ATE189550T1 (fr)
DE (2) DE4344120C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505199A1 (de) * 1995-02-16 1996-08-29 Wolfgang Dipl Ing Sachs Eigensichere Funkalarmanlage mit tragbaren Sendern und Empfängern

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4408268C2 (de) * 1994-03-11 2000-11-02 Grundig Ag Verfahren zur Erhöhung der Störsicherheit einer Funkalarmanlage
DE10133367C2 (de) * 2001-07-10 2003-10-23 Horst Ziegler Vebrauchszähler mit einer Funksendeeinrichtung zur Funkübertragung von Zählerstandsinformationen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735353A (en) * 1971-10-28 1973-05-22 Johnson Service Co Alarm transmission line security system utilizing pseudo random encoding
WO1990014484A1 (fr) * 1989-05-18 1990-11-29 Siemens Aktiengesellschaft Systeme emetteur-recepteur
DE4141035C1 (fr) * 1991-12-12 1992-12-17 Schaaf, Norbert, 6200 Wiesbaden, De
GB2257552A (en) * 1991-06-07 1993-01-13 Trw Sipea Spa Extra-safe remote control.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0293627A1 (fr) * 1987-05-19 1988-12-07 Ascom Radiocom AG Méthode de transmission radio

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735353A (en) * 1971-10-28 1973-05-22 Johnson Service Co Alarm transmission line security system utilizing pseudo random encoding
WO1990014484A1 (fr) * 1989-05-18 1990-11-29 Siemens Aktiengesellschaft Systeme emetteur-recepteur
GB2257552A (en) * 1991-06-07 1993-01-13 Trw Sipea Spa Extra-safe remote control.
DE4141035C1 (fr) * 1991-12-12 1992-12-17 Schaaf, Norbert, 6200 Wiesbaden, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505199A1 (de) * 1995-02-16 1996-08-29 Wolfgang Dipl Ing Sachs Eigensichere Funkalarmanlage mit tragbaren Sendern und Empfängern

Also Published As

Publication number Publication date
ATE189550T1 (de) 2000-02-15
DE4344120C1 (de) 1994-12-08
EP0660285B1 (fr) 2000-02-02
DE59409121D1 (de) 2000-03-09

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