RU78019U1 - HF POWER DIVIDER / TOTALIZER - Google Patents

Abstract

The invention relates to the field of railway transport, and in particular, to the field of railway safety equipment, and can be used to provide a passenger train with a wireless address emergency alarm and internal communication. The RF splitter / combiner contains the MDD1 assembly mounted on the circuit board, which includes four connectors, three RF connectors, and two resistors. The use of an RF signal divider / combiner of this design provides reliable communication between passenger and staff cars.

Description

The invention relates to the field of railway transport, and in particular, to the field of railway safety equipment, and can be used to provide a passenger train with a wireless address emergency alarm and internal communication.

This development is intended for use in communication systems on passenger trains of commuter and long-distance for the purpose of organizing communication channels and transmitting alarm signals. The device was developed on the basis of DECT technologies and allows equipping passenger trains with data and telephony devices, preferably taking into account the existing system of flexible formation of the composition of the passenger train, consisting of headquarters and passenger cars.

Known (RU, patent 2206177 Н04В 7/26, 2003) is an on-board communication network of rolling stock, characterized by the presence of a control and diagnostics panel (wearable console of the head of a train), in each car of rolling stock - terminal communication devices (in the form of mobile radiotelephones for staff and passengers , radio sensors and executive devices of the car automation system, miniature video surveillance terminals and other necessary devices) and a unified switching unit (in the form of a base station), a digital radio link connecting the on-board network to connection of the rolling stock with external communication systems, and the connection between the communication terminal devices and the unified communication node, as well as between adjacent

unified switching nodes carry out the radio channel, while the frequency range and level of the radio signal in the radio channel are selected so that the communication terminal devices are connected only with the unified switching node of the car in which the communication terminal devices are currently located, and the control and diagnostic console is made mobile and communicates via radio with a unified switching unit of the car in which the control and diagnostic console is currently located.

Known on-board communication network operates as follows. The control and diagnostic panel (wearable terminal of the train head) transmits and receives the radio signal at any point of the train through a network of unified switching nodes, both when the train head receives the radio signal from the terminal device, and when transmitting the radio signal to the terminal device, including during a passenger conversation by personal mobile phone with a subscriber remote from the train.

A disadvantage of the known on-board system should be recognized as the presence of only one control panel and diagnostics made in the form of a wearable version of the train head, a large number of switching nodes. In addition, the lack of the ability to automatically monitor the condition of the car, especially when replacing the cars included in the passenger train, should also be recognized as a drawback.

Known (RU, patent 0046895, 2005) is a passenger train safety and communication control system characterized by the presence of a central control system and DECT base stations, with each base station connected to a central control system, to each DECT base station via RF

the connectors are connected by two antennas installed on the roof of the carriage of at least one device for transmitting alarms from railway car alarm systems by generating voice messages for transmission to the carriage conductor and the head of the train, including a DECT radio socket, a voice auto-informer, a portable terminal with a push-button a dialer, while the alarm transmission device is connected to the outputs of the car’s emergency and fire alarm systems, at least one wearable terminal To receive signals alarm and automatic two-way phone communication, at least one repeater to amplify radio signals, at least one phone handset in the conductors service compartment and at least one hazard alarm button.

The repeater used in the system is designed to organize the radio access zone of wearable subscriber terminals (wearable phones) within a separate passenger carriage with subsequent transmission of information to the DECT base stations of the system. The wearable terminal is designed for two-way automatic telephone communication with other wearable terminals of this composition, and is also designed to receive information from the alarm sensors of this car (composition) with its subsequent transmission to the central control system. The repeater and the alarm system via a radio controller are usually connected by RF cables to the RF signal splitter (splitter).

The disadvantage of the passenger safety and communication control system of a passenger train is the difficulty of using it due to the unreliability of fastening high-frequency cables to the antenna input.

The technical problem solved by the proposed invention is to develop an improved alarm system and communication of a passenger train.

The technical result obtained by implementing the proposed system is to increase the safety of operation of a passenger train while increasing the level of service.

To achieve the specified technical result, it is proposed to use a splitter characterized by the presence of an MDD1 assembly (SMD type splitter), three RF connectors, and two ceramic resistors R1 and R2 in the specified safety and communication control system of a passenger train.

At the same time, the divider / adder of the RF signal is made in the form of a multilayer printed circuit board:

- to the input P4 MDD1 is connected the RF connector needed to connect an external antenna of the DECT standard;

- resistors R1 and R2 are connected to the input P3 of the MDD1 element, providing an input impedance of 50 Ohms;

- the RF connectors necessary for connecting DECT devices: TARB, repeater are connected to outputs P1 and P2. Functionally, the splitter performs the function of summing / dividing the RF signals from the alarm system through the radio controller and from the repeater (wearable terminal), ensuring their independent operation with the central control center via one DECT antenna.

The specified divider / adder (splitter) is a radio electronic device made in the form of a micro-component assembly with the ability to connect antennas

coaxial cables of electronic devices - repeater and wearable terminal.

The developed device provides information transfer from the repeater of the wearable terminal and the alarm system through the wearable terminal to the central control system and vice versa.

The developed design has the following operational characteristics:

RF splitter / combiner, has the following specifications:

- electrical characteristics:

- operating frequency: 1.88-1.90 GHz;

- wave impedance: 50 Ohms;

- FAC, not worse: 1.2;

- Insertion Attenuation: 3.2 dB;

- Signal power, no more: 3 W.

- mechanical parameters:

- type of RF connectors: SMA / F;

- Range of working temperatures: 0-45 ° С;

- Storage temperature range: -50- + 50 ° С;

The splitter is structurally made in the form of a printed circuit board on which the connectors and auxiliary elements are installed to ensure the performance of the splitter.

The developed splitter is designed to work as part of a communication system and transmit emergency messages of passenger long-distance and commuter trains. The specified security and communication control system for a passenger train consists of two types of functional parts - central and terminal. The central part is located in the head carriage and represents

a central control system (DECT radio controller) with base stations connected to it. Also in the head car are means for displaying emergency situations occurring in the train, and train signaling systems. The terminal parts of the system are located in passenger cars (and also, possibly, in the locomotive’s cabin) and are devices for collecting and transmitting alarm messages from the sensors of the car (and locomotive) via organized radio channels to the central part of the system.

The repeater is also part of the terminal block of the system and is responsible for organizing the local radio access zone of user terminals carried by the conductors within a separate passenger carriage and transmitting information to the central part of the system.

The subscriber terminal worn by the conductors is configured to receive information determining which headquarters car it will operate with the radio controller.

The splitter of the proposed design provides reliable communication between passenger and staff cars.

Claims (1)

An RF signal divider / combiner containing an MDD1 assembly mounted on a printed circuit board, which includes four connectors, three RF connectors and two resistors, with RF connectors made with the possibility of connecting devices operating to the first and second connectors of the assembly in the DECT standard, both resistors are connected in parallel to the third connector, forming an input impedance of 50 Ohms, and the fourth connector is connected to the RF connector needed to connect an external DECT antenna.