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WO2007011258A1 - Procede de radiocommunication entre des objets gardes et un poste de securite centralisee - Google Patents

Procede de radiocommunication entre des objets gardes et un poste de securite centralisee Download PDF

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Publication number
WO2007011258A1
WO2007011258A1 PCT/RU2006/000290 RU2006000290W WO2007011258A1 WO 2007011258 A1 WO2007011258 A1 WO 2007011258A1 RU 2006000290 W RU2006000290 W RU 2006000290W WO 2007011258 A1 WO2007011258 A1 WO 2007011258A1
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WIPO (PCT)
Prior art keywords
message
frequency
protected
time interval
messages
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/RU2006/000290
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English (en)
Russian (ru)
Inventor
Vladimir Petrovich Gribok
Sergey Alexandrovich Kosarev
Yuriy Vitalievich Raygorodsky
Valeriy Vladimirovich Slastin
Alexey Ivanovich Faleev
Alexandr Yurievich Sheptovetsky
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Obschestvo S Ogranichennoj Otvetstvennostju 'altonika'
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Obschestvo S Ogranichennoj Otvetstvennostju 'altonika'
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Publication of WO2007011258A1 publication Critical patent/WO2007011258A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping

Definitions

  • the invention relates to methods for transmitting control and alarm signals using radio communication systems with frequency hopping. Such methods can be used in equipment that establishes a radio link between a central security point (CC) and guarded objects, which can be both vehicles and real estate.
  • CC central security point
  • guarded objects which can be both vehicles and real estate.
  • the radio communication systems used in this equipment are used to transmit command messages from the central monitoring station to any selected protected object and any acknowledged messages (confirming the receipt of the command message), control messages or alarm messages from any protected object to the central monitoring station.
  • the most significant is the transmission of alarm messages to the central monitoring station, since the generation and transmission of alarm messages occurs in case of an emergency at the corresponding guarded object, for example, in case of fire or if unauthorized persons are exposed to the guarded object. Such unauthorized persons may be intruders who penetrated the protected object with the purpose of robbery.
  • Two main types of equipment for a radio communication system are known (from the point of view of organizing the transmission of any messages from a guarded object to a central monitoring station).
  • the first type includes such equipment of the radio communication system in which the moment of formation and transmission of the next message is not known at the guarded object and, as a rule, in the central monitoring station. A certain message is sent from the protected object only after
  • SUBSTITUTE SHEET (RULE 26) the occurrence of an event causing a subsequent transfer. For example, as soon as a fire alarm sensor is triggered, an alarm message about a fire is immediately generated and transmitted to the PCO.
  • Such equipment of a radio communication system is described, for example, in patents DE JY ° 4337211, G 08 V 25/10, G 08 V 29/00, G 08 C 15/00, H 04 V 7/24; EP Jfe0651361, G 08 V 25/10; RU ⁇ 2244959, G 08 ⁇ 25/10, G 08 ⁇ 29/16, ⁇ 60 R 25/10.
  • An object of the present invention relates specifically to the latter second type of apparatus of a radio communication system. And with this equipment, the transmission of messages must be carried out taking into account all the strict restrictions on the power and on the carrier frequency of the radio signal introduced on the territory of a state.
  • SUBSTITUTE SHEET (RULE 26) refuses to purchase similar equipment from this manufacturer and is looking for another manufacturer.
  • the nominal radio frequencies and power are limited to 433.92 MHz ⁇ 0.2% and 5 mW, respectively (when installed on vehicles) and 10 mW (for other protected sites).
  • the distance of the protected objects from the central monitoring station should be several hundred meters. This is not enough to build effective wireless alarm equipment.
  • the traditional way to increase the distance of protected objects from the central monitoring station is to use the relay of signals of protected objects.
  • the construction of a network of repeaters causes additional costs for construction work and, in addition, requires the permission of the state radio frequency services and permissions from the owners of the structures on which the repeaters are installed.
  • One of the promising methods providing the possibility of transmitting messages from protected objects to the central monitoring station without using an extensive network of repeaters is the use of “jumping” frequencies in transmitted messages (Freepeps horpip).
  • SUBSTITUTE SHEET (RULE 26) received as a message from this protected object, indicating its normal operation, this artificial message should not only begin at the appropriate time, but should also be transmitted at the appropriate carrier frequency.
  • this artificial message should not only begin at the appropriate time, but should also be transmitted at the appropriate carrier frequency.
  • the use of “jumping” frequencies significantly reduces the likelihood that a pair of messages will be lost due to the coincidence of the transmission time intervals: for the loss of a pair of messages, the proximity of their carrier frequencies is also needed. However, if you do not control the choice of transmission start times and carrier frequencies, then loss of message pairs cannot be avoided. Let's say that messages from a hundred of protected objects come to the PCO.
  • the time interval from the beginning of the transmission of any message to the beginning of the transmission of the next message is set within two to four minutes (with a hundred equally probable choices).
  • the number of equally probable carrier frequency selection options for each message is one thousand. Then, every hour in the central monitoring station, two to three pairs of messages generated by different protected objects will be lost.
  • the present invention is aimed at improving the prototype, taking into account current restrictions on the range of radio frequencies and powers.
  • the subject of this invention is a radio communication method between guarded objects and a central monitoring station, in which the central monitoring station identifies the need for a corresponding control signal for each protected object, generates a binary code for this control signal and transmits it over the air as part of a command message received at the corresponding protected object, in each of the protected objects they form in binary code and transmit acknowledgment, control or alarm messages to the PCO via radio, moreover, the acknowledgment message A message is generated after receiving a command message from the PCA, an alarm message - after an alarm event is detected at the guarded object, and a control message - if there are no conditions for the generation of an acknowledgment and alarm message, the alarm event is detected in the PCC, which caused the alarm message to be generated, and make a decision adequate to the disturbing event that occurred, when transmitting from each protected object any message - acknowledging, monitoring or alarming - determined dissolved expected T the time interval between the moments of the start of transmission of this and the next message of the protected object and the carrier frequency F of the
  • SUBSTITUTE SHEET (RULE 26) symbols of logical zero and logical units must be transmitted, and if there is no reception of the expected message in the selected frequency areas, they shall take measures adequate to the measures taken when an alarm message is received from the corresponding protected object, if there is a message received by successively shifting the digital filtering time interval by a step, shorter than the transmission time interval of one bit in the message, determine the moments of change in the bits in the message and the shift in time of the start of the message, call Considered by the mismatch of the reference frequency of the generators in the monitoring station and the protected object, they will decrypt the received message and take actions adequate to its content and taking into account the conditions that occur in the central monitoring station, check whether these actions require a control signal to be sent to the protected object, and if there is such a requirement, form a command message containing the desired control signal, and transmit it at frequencies of logical zero and logical units in the received PCO message with amendments taking into account the set when In the case of the message, the reference frequency of
  • the expected time interval for receiving the next message is compared with the previously expected time intervals for the receipt of messages from other protected objects, and the presence of the overlap of these intervals on the expected time
  • SUBSTITUTE SHEET (RULE 26) the reception interval for the next message, taking into account the duration of the additional time interval for the submission of the command message, if such an overlap is detected, the presence of the proximity of the carrier frequencies is checked and, with the proximity of the carrier frequencies established, a change command is generated for the protected object under consideration for the formation and / or carrier frequency of the next message, and then stored in PCO and guarded object adjusted parameters.
  • the time interval T between the moments when the transmission of this and the next message starts from the corresponding protected object is increased to the maximum allowable value T MAX .
  • Digital filtering of messages in the central monitoring station is carried out using the fast Fourier transform.
  • an allowable frequency overlap is established in adjacent spectral regions, at least a step ⁇ p of the frequency grid.
  • each message In the structure of each message, a synchronization marker, an information block made using error-correcting coding, and a checksum are distinguished.
  • the objective of the invention is the creation of a technology that provides an increase in the range of the known alarm equipment used in the protection of vehicles and real estate, taking into account the actual restrictions on the nominal values of the used radio frequencies and radiation powers of the transmitters.
  • the technical result of the invention is to create a fairly simple in technical implementation and not having restrictions
  • At '2 is a block diagram of an exemplary technical realization of the apparatus of the protected object.
  • Fig.3 shows a structural diagram of an example of a technical implementation of the equipment PTsO.
  • the equipment of the guarded facility is installed on the corresponding guarded property or in a vehicle.
  • the structure of an example of technical implementation of the equipment of the protected object (figure 2) includes sensors 1, the outputs of which are connected to the object control unit 2. The corresponding outputs of the object control unit 2 are connected
  • SUBSTITUTE SHEET (RULE 26) to the input of the pseudo-random selection node 4, to the first input of the object time register 6, to the first and second inputs of the object time counter 7 and to the first input of the object shaper 9 messages configured to transmit the corresponding messages over the air to the central monitoring station.
  • the outputs of the object register 6 and the object counter 7 are connected to the corresponding inputs of the matching circuit 8, the output of which is connected to the first input of the object control unit 2 and to the second input of the object driver 9 messages.
  • the third input of the object driver 9 messages is connected to the output of the object register 5 frequency and is connected to the input of the object receiver 3, configured to receive the corresponding command messages from the central monitoring station via radio.
  • the output of the object receiver 3 is connected to the second input of the object block 2 of the control, and the outputs of the node 4 pseudo-random selection are connected, respectively, to the second input of the object register 6 time and to the input of the object register 5 frequency.
  • the equipment of the central monitoring station is installed in general for all protected objects of the central monitoring station.
  • the heterodyne receiver 17 made with the possibility of receiving messages from protected objects is included in the example of technical implementation of the PCO equipment (FIG. 3).
  • the output of the heterodyne receiver 17 through an analog-to-digital converter 18 is connected to the first input of the digital filter block 19.
  • the second input of the digital filter block 19 is connected to the first input of the block 13 of the pseudo-random selection nodes and to the output of the first comparison circuit 12.
  • the first input of the first comparison circuit is connected to the output of the current time counter 11, and the second input is connected to the output of the auxiliary time register 10 and to the first input of the central control unit 22, the second input of which is connected to the first output
  • the second output of the digital filter unit 19 through the decision unit 21 is connected to the third input of the Central control unit 22.
  • the second input of the block 13 of pseudo-random selection nodes is connected to the output of the auxiliary address register 14.
  • the first output of the block 13 of pseudo-random selection nodes is connected through the central frequency register 15 to the fourth input of the central control unit 22.
  • the second output of the block 13 of pseudo-random selection nodes is connected to the first input of the central time register 16, the output of which is connected to the fifth input of the central control unit 22, the sixth input of which is connected to the output of the second comparison circuit 24.
  • the first input of the second comparison circuit 24 is connected to the first output of the buffer memory 23, the first input of which is connected to the second input of the second comparison circuit 24 and to the first output of the central control unit 22.
  • the second output of the central control unit 22 is connected to the input of the command message generator 25 configured to transmit command messages for the respective protected objects over the air.
  • the seventh input of the central control unit 22 is connected to the second output of the buffer memory 23, the second input of which is connected to the third output of the central control unit 22, the fourth output of which is connected to the second input of the central time register 16.
  • the third, fourth and fifth outputs of the buffer memory 23 are connected to the inputs, respectively, of the auxiliary time register 10, the auxiliary address register 14 and the auxiliary frequency register 20.
  • the output of the auxiliary frequency register 20 is connected to the third input of the digital filter unit 19.
  • Sensors 1 are technical means of fire and security alarm systems designed to detect a fire at a guarded object or to detect penetration (attempts
  • SUBSTITUTE SHEET (RULE 26) penetration) of unauthorized persons to the protected facility, as well as to identify the fact of exposure to the protected facility that exceeds the normalized level. That is, the sensors 1 detect alarm events at the guarded object. Upon detection of alarm events, the sensors 1 generate the corresponding alarm notifications. In addition, the sensors 1 can also generate control and diagnostic alerts.
  • the types and main characteristics of technical means of fire and security alarms are widely known in the scientific and technical literature (for example, "Directory of engineering and technical workers and electricians of technical means of security and fire alarms", Moscow, Ministry of Internal Affairs, GUVO, 1997).
  • the object control unit 2, the decision unit 21, the central control unit 22 and the second comparison circuit 24 can be performed, for example, according to the programmable controller circuits.
  • As an analog-to-digital Converter 18 can be used with standard commercially available chips.
  • Block 19 of digital filters can be made on the basis of digital filtering nodes of an integrating type using the fast Fourier transform method.
  • the structure of the equipment of each guarded object includes a special pseudo-random selection node 4 designed specifically for this guarded object. It allows pseudo-random selection of the carrier frequency of the next message and the time interval between sending this message and sending the previous message.
  • the node 4 of the pseudo-random choice is a constant non-volatile memory (although in practice the choice of hardware implementation of the node 4 of the pseudo-random choice can be extremely wide).
  • SUBSTITUTE SHEET (RULE 26) a pseudo-random selection is a set of storage devices, the contents of each of which completely coincides with the contents of the node 4 of the pseudo-random selection (which is part of the corresponding protected object).
  • Block 13 nodes of the pseudo-random selection is made with the possibility of selecting a specific storage device according to the contents of the auxiliary address register 14.
  • the heterodyne receiver 17 should be configured to carry out the transfer of the input frequency band to the region of lower (eg, sound) frequencies when receiving radio signals.
  • the object driver of the message 9 and the driver 25 of the command message are configured to generate signals in the desired frequency band with a corresponding (external to them) selection of the carrier frequency.
  • the object message shaper 9 and command message shaper 25 can be performed according to the standard transmitter scheme with the selected modulation type as the serial code of the message to be transmitted.
  • a number of protected objects are located (Fig. 1).
  • Such protected objects may be vehicles or real estate.
  • SUBSTITUTE SHEET (RULE 26) Each of the protected objects is connected via a corresponding radio channel with a central monitoring station.
  • the central monitoring station generates individual control signals for each protected object transmitted by the binary code over the air as part of the so-called command messages. After receiving the command message at the corresponding guarded object, an acknowledgment message is generated confirming the receipt of the command message.
  • disturbing events can occur, which include, for example, a fire or an attack on this protected object by intruders.
  • Security equipment located at this guarded facility detects alarm events and then sends the corresponding alarm message to the central monitoring station.
  • the PCO determines which alarm event occurred at the guarded object and take appropriate measures, for example, in the event of a fire, a fire brigade is sent to the appropriate address.
  • each of the messages of a certain i-th protected object is supplied and, accordingly, arrives at the central monitoring station at strictly defined time points (t réelle, f ⁇ ... ti, p > ti iP + 1 ). These time points are calculated both in each guarded object and in the central monitoring station.
  • the algorithm for the pseudo-random equiprobable choice of the time interval T is special for each of the protected objects, however, each of the algorithms for the pseudo-random equiprobable choice of the time interval T for the protected object is also known in the central monitoring station. Common to all algorithms for the pseudo-random equiprobable choice of the time interval T are three parameters: Tmin - the minimum allowable time interval;
  • T MAX - the maximum allowable time interval; ⁇ t is the time interval selection step.
  • the binary code of each message is transmitted on a pseudo-randomly selected carrier frequency F.
  • Algorithms for the pseudo-random equiprobable choice of the carrier frequency F are specific for each of the protected objects, however, each of the algorithms for the pseudo-random equiprobable choice of the carrier frequency F for the protected object is also known in the PCO.
  • Common to all algorithms for pseudo-random equiprobable selection of the carrier frequency F are three parameters: Fmin - the minimum allowable carrier frequency; F MAX - maximum allowable carrier frequency; ⁇ F is the step of the frequency grid.
  • frequency modulation When transmitting, frequency modulation is used. For example, a logical zero is transmitted at a carrier frequency F, and a logical unit is transmitted at a frequency F + K- ⁇ F.
  • each message contains: - a synchronizing marker; information block (made, for example, using error-correcting coding); - check sum.
  • the number of bits in each type of message is strictly constant.
  • the duration of the transmission of each discharge is the same.
  • a number of sensors 1 are installed at the guarded object (vehicle or real estate), each of which implements the assigned security function directly for it in the security zone established for it. For example, one of the sensors 1 can make sure that the garage door is closed and maintains its integrity in a secured summer cottage. Another sensor 1 monitors the integrity and closed state of one of the windows of the house, etc.
  • the task of the sensors 1 is to fix certain events (including disturbing events) and transmit information about these events to the object control unit 2 (which can be, for example, a specially programmed microcontroller).
  • a signal from the object receiver 3 also arrives at the object control unit 2 (when any command message from the central monitoring station arrives at this protected object).
  • the object control unit 2 according to the information received from the sensors 1 and from the object receiver 3, prepares a message code (acknowledging, monitoring or alarm) to be transmitted next. After the set minimum acceptable time interval (Tmin) has passed from the moment the last message starts, the object control unit 2 issues a command to node 4
  • Tmin set minimum acceptable time interval
  • the minimum allowable content of the object register 6 times (for example, all logical zeros) between transmitted messages, the minimum allowable time interval Tmin e is set and with the maximum allowable contents of the object register 6 times (for example, all logical units) the maximum allowable time interval T MAX between transmitted messaging.
  • the object control unit 2 resets the object time counter 7 and starts to send counting signals to it, with a period equal to the step ⁇ t of the time interval selection.
  • the equality of the contents of the object time counter 7 to the contents of the object register 6 times means that the set expected time interval T has passed from the moment of the previous message.
  • Matching circuit 8 establishes the coincidence of the contents of the object counter 7 time and the object register 6 times, and then sends a signal to the object shaper 9 messages to the object control unit 2.
  • the object control unit 2 remembers the moment the signal arrives at it from the coincidence circuit 8. This moment the object control unit 2 considers as the moment of the beginning of transmission of the next message, because the signal from the matching circuit 8, the object driver of the message 9 starts transmitting the next message to the air.
  • the object control unit 2 Upon completion of the transmission of the message, the object control unit 2 turns off the object shaper 9 of the message and switches to the standby mode for receiving a command message, which can be received in the object block 2 from the object receiver 3.
  • the carrier frequency of the expected command message is set for the object receiver 3 from the output of the object 5 frequency register.
  • a command message from the ARC (at the same carrier frequency F) is sent strictly to a specific protected object (no address is required). After receiving the command to the object control unit 2, this object control unit 2 starts working out the contents of the received command, carrying out the required actions.
  • the pseudo-random selection node At the address arriving at the block 13 of the pseudo-random selection nodes from the auxiliary address register 14, in the block 13 of the pseudo-random selection nodes, the pseudo-random selection node whose operation algorithm corresponds to the operation algorithm of the pseudo-random selection node 4, which is part of the protected object, is received and received from which it is expected in PTsO.
  • the set of signals appears that should be generated in the corresponding guarded object at the output of the pseudo-random selection node 4 during the formation of the next message. This set of signals goes to the central frequency register 15 and to the central time register 16.
  • SUBSTITUTE SHEET (RULE 26) low frequencies. That is, as a result of the conversion, instead of the carrier frequency F, there appears a certain frequency Fi that is uniquely associated with it by a linear transformation. From the output of the heterodyne receiver 17, the signals are fed to an analog-to-digital converter 18, where they are converted to digital form. Further, the received signals are fed to the digital filter unit 19. The code of the expected frequency Fj is transmitted to the same block of digital filters 19 from the output of the auxiliary frequency register 20. Using this code, the digital filter unit 19 creates several digital filters corresponding to the frequency of the expected signals.
  • the allocated frequency intervals must overlap to ensure the receipt of notifications near the boundaries of the intervals.
  • the amount of overlap is determined when programming the operation of block 19
  • SUBSTITUTE SHEET (RULE 26) digital filters.
  • the digital filter unit 19 was built on the basis of a fast Fourier transform.
  • decision block 21 From the output of digital filter block 19, the signal is sent to decision block 21. If at the expected time for receiving a message at the expected frequency there is no signal reception, then decision block 21 includes a warning about an alarm event: no messages from a specific protected object.
  • the digital filter unit 19 detects the presence of a signal in the desired frequency range, then the integration intervals must be set in the digital filter unit 19, the beginning and end of each of which must correspond to the beginning and end of the discharge transmission in the message of the protected object. Setting integration intervals is carried out when receiving a synchronizing message marker.
  • the signal issued by the first comparison circuit 12 at the time ti ) P will indicate the beginning of message reception.
  • a certain limited time shift is allowed between the beginning of the reception of the message and the beginning of the output signal of the first comparison circuit 12.
  • the maximum permissible value of this shift ⁇ ⁇ can be estimated. That is, it can be considered acceptable that the reception of a message begins at any arbitrary time within
  • This time limit can, for example, be divided into a certain number of equal shares determined by the program of work
  • SUBSTITUTE SHEET (RULE 26) block 19 of digital filters, and choose the moment the message begins to receive the maximum integral function corresponding to finding the received signal in a certain frequency range. If, for example, logical zeros and logical units are transmitted alternately in the synchronization marker, then the signals will appear alternately at the outputs of one of the following filter pairs:
  • the integration time in each of the digital filters is exactly equal to the time of receipt of one bit of the message.
  • the estimated time t i) P of the start of reception is recorded in the auxiliary time register 10, a correction ⁇ to this time moment is set in the digital filter block 19, and the expected value T of the time interval between the filing of the considered message of this protected object is stored in the central time register 16 and by filing the next message from the same guarded facility.
  • the central control unit 22 calculates the expected time t i) P + i of receiving the next message from the i-th guarded object.
  • the central control unit 22 updates the expected frequency value of the next message recorded in the central frequency register 15.
  • the Central control unit 22 sequentially reads from the cells of the buffer memory 23 the values of the expected moments of reception
  • SUBSTITUTE SHEET (RULE 26) Messages from each of the remaining protected sites.
  • each of the read values is compared with the calculated expected time ti ) P + i of receiving the next message from the i-th guarded object. If the comparison reveals the possibility of blocking the message from the i-th protected object (taking into account the fact that a command message can be transmitted immediately after the end of this message) with a message from some other protected object or with a command message, then the second comparison circuit 24 gives about this signal to the Central control unit 22.
  • the central control unit 22 sets in the central time register 16 the content corresponding to the maximum allowable interval between submission of messages from one source (for example, all logical units), and then repeats the calculation of the expected time tj ) P + i of receiving the next message from the i-th protected object, taking into account the change in the contents of the central register 16 time.
  • the central control unit 22 remembers that upon receipt of a message from the i-th protected object, it is necessary to submit a command message about the postponement of the next message from the i-th protected object.
  • central control unit 22 When all the checks carried out the second comparison circuit 24, central control unit 22 writes the i-th cell buffer memory 23, calculated values of the expected moment tj> p + i receive the next message from the i-th protected object and the carrier frequency of the communication.
  • the message continues to be received from the i-th protected object.
  • the message bits are sequentially delivered to the deciding unit 21, where the content of the message is evaluated essentially.
  • the decisive At the end of receiving the message, the decisive
  • SUBSTITUTE SHEET (RULE 26) unit 21 transmits a signal corresponding to the received message to the central control unit 22.
  • the central control unit 22 includes a corresponding alarm, according to which an adequate solution is developed in the central monitoring station. The development of a specific adequate solution does not relate to the subject of this patent.
  • the central control unit 22 After the signal about the received message is received in the central control unit 22, the central control unit 22 checks whether it is necessary to generate a command message for the i-th guarded object. Such a message may be, in particular, a command message about the postponement of the next message by the i-th protected object. If this command message does not need to be generated, then the central control unit 22 checks if there are any requirements for the formation of any other command message. If it is necessary to transmit a command message, the central control unit 22 includes a command message generator 25, which, on an adjusted carrier frequency, transmits over the air a serial code of the corresponding command message.
  • a command message generator 25 which, on an adjusted carrier frequency, transmits over the air a serial code of the corresponding command message.
  • the central control unit 22 Upon completion of the transmission of the command message (or after the fact of the absence of the need for its transmission to be detected), the central control unit 22 starts sequential interrogation of the cells of the buffer memory 23. Using the second comparison circuit 24, the cell of the buffer memory 23 is detected, in which the smallest moment of the expected time of receipt of the message is recorded. After that, from the buffer memory 23 is overwritten:
  • the central monitoring station is prepared to receive the next message from the protected object.
  • the work of the PCO considered above is further completely repeated.
  • the technical implementation of the proposed method is significantly simpler. This provides a significant increase in the signal-to-noise ratio due to the multiple narrowing of the passband of the receiving path in the PCO, which proportionally reduces the noise power in the received frequency band while maintaining the useful signal power.
  • equipment was tested that implements radio communication methods corresponding to the prototype and the claimed technical solution. Tests have shown that when fulfilling the requirements to limit the radio frequencies used and the radio signal power, the use of the proposed technical solution allows, all other things being equal, to increase the maximum permissible distance between the guarded object and the PTOs more than twenty times.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)

Abstract

La présente invention se rapporte à la signalisation de contrôle et d'alerte à sauts de fréquence. Le procédé selon l'invention consiste, dans un objet gardé, à former des messages d'accusé de réception, de contrôle ou d'alerte, et à les transmettre à un poste de sécurité centralisée, une transition d'un zéro logique à une unité logique étant réalisée, lors de la formation du message, à l'aide d'un déplacement de fréquence ; à déterminer, lors de la transmission du message, un intervalle de temps attendu séparant le moment de transmission du message donné de l'objet gardé et celui du message suivant, ainsi que la fréquence porteuse du message suivant ; à attendre, à la fin de la transmission du message, la réception d'un signal de commande émanant du poste de sécurité centralisée durant l'intervalle de temps donné. Dans ledit poste de sécurité centralisée, l'invention consiste : à procéder à une réception large bande de signaux lorsque le moment en cours approche du moment enregistré de distribution du message suivant ; à transférer la bande de fréquences d'entrée dans une plage de fréquences moins élevée ; à effectuer une conversion analogique-numérique ; à sélectionner des plages de fréquences qui sont proches des fréquences de transmission des symboles de zéro et d'unité contenus dans le message attendu ; à déterminer les moments de modifications de bits dans le message et le retard, par le décalage successif de l'intervalle de temps du filtrage numérique ; à déchiffrer le message ; et à transmettre le signal de commande destiné à l'objet gardé sur les mêmes fréquences. L'invention permet d'élargir la zone de service d'un système de signalisation.
PCT/RU2006/000290 2005-07-19 2006-06-02 Procede de radiocommunication entre des objets gardes et un poste de securite centralisee Ceased WO2007011258A1 (fr)

Applications Claiming Priority (2)

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RU2005122868 2005-07-19
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RU2384887C2 (ru) * 2007-06-14 2010-03-20 Сергей Николаевич Кононов Система контроля соблюдения правил дорожного движения
RU2351066C1 (ru) * 2008-03-03 2009-03-27 Общество с ограниченной ответственностью "АЛЬТОНИКА" (ООО "АЛЬТОНИКА") Способ радиосвязи между охраняемыми объектами и пунктом централизованной охраны
RU2444793C1 (ru) * 2010-10-21 2012-03-10 Открытое акционерное общество "Авангард" Система контроля соблюдения правил дорожного движения
US9269258B2 (en) * 2012-04-13 2016-02-23 Vihtori Lehtonen Method and control arrangement to secure an alarm system

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DE4128167A1 (de) * 1991-08-24 1993-02-25 Telefunken Systemtechnik Verfahren zur steuerung der kanalumschaltung in einem nach dem frequenz-hopping-verfahren arbeitenden funkgeraet
JPH099366A (ja) * 1995-06-23 1997-01-10 Kokusai Electric Co Ltd 移動型無線監視システム
JPH11168478A (ja) * 1997-08-12 1999-06-22 Pronet Tracking Syst Inc 無線位置決定方法及びシステム
US6870875B1 (en) * 1999-09-30 2005-03-22 Andrzej Partyka Transmission of urgent messages in frequency hopping system for intermittent transmission
RU2244959C1 (ru) * 2004-04-21 2005-01-20 Общество с ограниченной ответственностью "Альтоника" Способ передачи и приема извещений в системах централизованной охраны объектов недвижимости и транспортных средств

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