RU2269874C2 - Ultra long-wave pager broadcasting system - Google Patents

Abstract

FIELD: electro-radio engineering, possible use for delivering notification broadcast signals to clients via ultra long-wave channel.

SUBSTANCE: device additionally includes commutator of lines of manipulation connected to ultra long-wave transmitting radio-stations. ULW radio-stations emit electromagnetic waves, received by client radio-receivers at extensive distances (2000 kilometers and more).

EFFECT: increased delivery distance of broadcast signals with given time-probability characteristics along ultra long-wave radio-channel of pager notification system.

1 dwg

Description

The invention relates to the field of electro-radio engineering and can be used to bring messages to subscribers via a super-long-wave radio channel of a pager warning system.

One of the main requirements for a pager notification system is to ensure stable communication with a large number of personal subscribers located at large distances from the transmitter (up to 2000 km or more).

Known radio transmission device for communication used in a vehicle [Federal Republic of Germany patent No. 3537107, H 04 B 7/155, 1987]. The device consists of a radio transmitter, an external antenna of the connecting feeder, an internal antenna of the amplifier and a receiver. The vehicle has an external antenna that receives signals sent by the radio transmitter. An antenna connecting feeder is introduced into the vehicle, where the received signal is amplified by an amplifier and radiated within the vehicle via an internal antenna.

The disadvantage of the analogue is the inability to establish alerts with a large number of subscribers located over long distances (more than 2000 km).

Closest to the technical nature of the claimed object is a "call system in case of alarm and emergency" [US patent No. 6032036, H 04 Q 7/20 from 02.29.2000]. The system comprises receiving subscriber devices (pagers) installed at the subscribers and connected via the telephone line to the central device. Each receiving subscriber unit is connected via radio communication with alarm transmitters.

If one of the transmitters transmits a warning signal, the corresponding receiving subscriber devices are called in a certain sequence. The various functional parameters of each receiving subscriber unit are stored in its control unit. These functional parameters can be entered, switched or modified remotely from the central unit in accordance with the remote control procedure.

However, this system has significant disadvantages:

- it is necessary to lay communication lines to each subscriber, which leads in most cases to significant requirements for linear cables;

- this system does not provide notification of subscribers at large distances (2000 km or more), since it operates in the VHF range, the range of which is determined by the horizon line.

The aim of the invention is to increase the range of bringing alerts with predetermined probability-time characteristics through the use of super-long-wave (SDV) radio channel pager warning system.

This goal is achieved by the fact that the ultra-long-wave pager notification system includes a central communication post and subscriber radio receivers located at users and connected via radio communication with transmitters of warning or alarm signals, as well as an additionally introduced stand-alone pager terminal on which the telephone set is installed an operator connected to the PBX, an operator display and a keypad connected to the operator’s personal computer, which through the telegraph channel adapter associated with central post and communication through hosted on its control panel and the switch is connected to the manipulation of lines superlong radio station.

The block diagram of the system is shown in the drawing.

It contains an autonomous pager terminal 1, a central communication station 2, transmitting ultra-long-wave radios 3 and subscriber radio receivers 4.

The subscriber pager terminal 1 contains a telephone set of operator 5, which is connected to the telephone exchange, a display of operator 6 with a keypad 1 connected to a PC of operator 8 of the Pentium PC type. The operator’s personal computer 8 is connected to the telegraph channel adapter 9 and operates under the control of the software of an autonomous pager terminal located in its memory and on boot diskettes of the 3, 5 '' format.

The central post of communication 2 contains a control panel 10 and a switch of the manipulation line 11 connected to transmitting SDW radio stations 3.

The stand-alone pager terminal 1 is used to generate messages intended for transmission of an operator 8 operator with a telegraph channel via a super-long-wave pager system for notifying / pairing a PC of operator 8, as well as for automatically generating and transmitting test information via a telegraph channel located in a read-only memory (ROM) of the telegraph adapter channel 9.

The central post 2 carries out the switching of the data transmission channel from the autonomous pager terminal 1 on the manipulation line of the ADD of radio centers and the return channel from the ADD of radio centers to the reception channel of the autonomous pager terminal 1.

Transmitting ADD radios 3, which are located at the transmitting radio centers, operate at a fixed frequency in the normal mode (for example, f = 18.9 kHz in the CT-75 mode at a speed of 64 bit / s).

Subscriber radio receivers 4 are located in service areas of transmitting ADD radio stations. Each subscriber radio receiver 4 has a built-in antenna module and an external adapter block for connecting the radio receiver 4 to external antenna devices of various types (pin, dipole, frame, etc.). The specified technical solution completely solves the problem of radio reception of warning signals in shielded rooms and in conditions of intense industrial interference. In addition, to restore the resource of autonomous power supplies of subscriber radio receivers when charging them during operation, each of them includes an external power adapter.

Subscriber radio receivers 4 are intended for receiving, displaying and storing notification texts received by subscribers at their personal addresses. Each subscriber radio receiver 4 consists of a display on which the received alert text is displayed, RAM random access memory, ROM read-only memory, audio signal supply device and other blocks.

The telephone set of the operator 5 is used for receiving by the operator of the autonomous pager terminal 1 emergency messages intended for transmission over an ultra-long-wave pager system. In addition, reports on the state of technical equipment are made on it and communication with the operators of the SDV radio centers is provided.

The personal computer of operator 8 is used to generate messages intended for transmission via an extra-long-wave pager system of notification, registration, documentation and storage of outgoing pager messages. It provides control over the readiness of the channel and automatic transmission of the generated information package via an extra-long-wave pager warning system.

The information output and control input of the autonomous pager terminal 1 is interfaced with a standard telegraph channel at the junction of C1-TG.

The telegraph channel adapter 9 is designed to interface the PC of the operator 8 with the telegraph channel, as well as to automatically generate and transmit test information stored in the ROM via the telegraph channel.

The software of the stand-alone pager terminal 1 is necessary for controlling the system, as well as for preparing texts of messages intended for transmission to selected subscribers, generating information packets and controlling their transmission along the manipulation lines of the SDV radio centers. The software operates in the WINDOWS operating environment.

The following software operation modes are used: "Administrator", "Operator", "Change Password" and "Windows". In the "Administrator" mode, the operator database is maintained, the operating terminals are managed, the criteria for generating system server overload signals are maintained, the subscriber database is maintained, and statistics of the notification system work are viewed.

In the "Operator" mode, messages are prepared for sending to subscribers. The "Change Password" operating mode is designed to change the password for the administrator working behind the terminal. The "Windows" mode allows you to switch between open program windows.

The control panel 10 serves to enable and disable the data channel of the autonomous pager terminal 1 from the manipulation lines of the transmitting ADD radio centers using the switch of the manipulation lines 11.

The operation of the super-long-wave pager warning system is carried out as follows: the operator of the autonomous pager terminal 1 receives, via telephone channel 5, a message intended for transmission to subscribers of the super-long-wave pager warning system. Using the operator’s typewriter keyboard 7, operator 8 and the super-long-wave pager notification system software, the operator prepares message texts intended for transmission to selected subscribers, generates an information packet for transmission along the manipulation lines to the transmitting ADD radio centers and writes it to the operator 8 personal computer’s memory in the queue for sending out.

When at least one message appears in the queue for sending a message, the software of the super-long-wave pager notification system starts the continuous generation of the “point” signal (meander) with a frequency of 18 Hz into the transmission channel from the stand-alone pager terminal 1 to the central communication post.

With the receipt of the specified signal, the operator of the central post 2 transits the data channel from the autonomous pager terminal 1 to the manipulation line of the on-duty transmitting SDV radio center 3 and the return channel from the SDV radio center 3 to the receive channel of the autonomous pager terminal 1. With receiving from the autonomous pager terminal 1 the “point” signal, the operator of the on-duty SDV radio center 3 provides for 28 seconds a rise in the high voltage of the transmitter of the SDV radio center 3 and its regular broadcasting.

The channel switching produced by the operator of the central communication station 2 provides a return to the stand-alone pager terminal 1 through the return channel (reception channel) of the “point” signal with a frequency of 18 Hz, confirming the readiness of the dedicated ADD radio transmitter for operation.

28 seconds after the receipt of the indicated signal, the software of the super-long-wave pager warning system replaces the 18 Hz “point” signal in the manipulation channel with the text of information messages stored in the PC memory of the operator 8 of the stand-alone pager terminal 1 in the sending queue.

After sending the last informational message from the autonomous pager terminal 1 to the transmission channel to the central post 2, no manipulation signals are received. A pause in the manipulation channel with a duration of more than 4 seconds serves as a signal to the operator of the on-duty SDV of the radio center 3 to remove high voltage and end the information transfer session via the super-long-wave pager warning system.

The total transmission time of one information message when working in the notification mode is from 10 to 45 s, depending on its volume.

In order to prevent sending information messages from the autonomous pager terminal 1 to the radio centers 3 not prepared for operation by the VDS, after the end of each operation session of the super-long-wave pager notification system, the central post office operator 2 disconnects the data transmission channel of the autonomous pager terminal 1 from the VDS radio manipulation center 3 manipulation line and the reverse reception channel data ADD radio center 3 autonomous pager terminal 1.

For operational control of operating modes, the stand-alone pager terminal 1 is equipped with an audible alarm unit, which is connected by the operator to the transmission or reception channel.

Reports on the state of the technical equipment of the autonomous pager terminal 1 are made by its operator using the telephone communication channel 5. The results of receiving pager messages during the operation of the autonomous pager terminal 1 are recorded and processed by the PC of operator 8 using the software of an extra-long-wave pager warning system.

The developed small-sized portable subscriber radio receiver 4 provides the reception of text messages of an ultra-long-wave pager warning system at distances of about 2000 km from transmitting radio stations, including in areas of a high level of interference caused by large industrial centers. Moreover, each subscriber radio receiver 4 has one personal and one common circular call number, as well as up to 5 group call numbers.

The conducted experimental tests showed the high efficiency of the operation of the hardware and software of the super-long-wave pager warning system, developed at the modern technical level.

The technical means of the experimental super-long-wave pager warning system have the following parameters:

- fixed operating frequency - 18.9 kHz;

- an operating mode - frequency telegraphy of ChT-75 at a speed of 64 bit / s;

- type of information - text messages transmitted in packets of up to 1024 characters;

- the number of continuously transmitted packets in one session - up to 50 packets;

- the amount of RAM - up to 198 messages;

- transmission protocol - standard POCSAG pager with noise-resistant coding of information;

- the number of personal subscribers in the system - up to 2 × 10 ⁶ ;

- the voltage of the autonomous power supply of the subscriber radio receiving device is 1.2 V.

An achievable technical result is an increase in the range of signaling warning signals with predetermined probability-time characteristics via a super-long-wave radio channel of a pager warning system.

Claims (1)

An ultra-long-wave pager warning system, comprising a central communication station and subscriber radio receivers located by users and connected by radio communication with transmitters of warning or alarm signals, characterized in that an autonomous pager terminal is installed on which an operator telephone set is connected to the PBX, the operator’s display and the keypad connected to the operator’s personal computer, which is connected via a telegraph channel adapter to the central Through the communication center and through the control panel and the switch of the manipulation lines located on it, it is connected to ultra-long-wave transmitting radio stations.