CN211429529U - A field intensity covers communication system for railway weak field interval - Google Patents

A field intensity covers communication system for railway weak field interval Download PDF

Info

Publication number
CN211429529U
CN211429529U CN201921858480.XU CN201921858480U CN211429529U CN 211429529 U CN211429529 U CN 211429529U CN 201921858480 U CN201921858480 U CN 201921858480U CN 211429529 U CN211429529 U CN 211429529U
Authority
CN
China
Prior art keywords
interval
450mhz
400khz
repeater
signal
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.)
Active
Application number
CN201921858480.XU
Other languages
Chinese (zh)
Inventor
洪清喜
洪杰辉
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to CN201921858480.XU priority Critical patent/CN211429529U/en
Application granted granted Critical
Publication of CN211429529U publication Critical patent/CN211429529U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

The utility model provides a field intensity covers communication system for railway weak field interval, including setting up the many intervals retransmission platforms in whole communication interval, interval retransmission platform converts 450MHz signal into 400KHz signal, each interval retransmission platform passes through 450MHz antenna and is connected with communication terminal equipment, each interval retransmission platform passes through 400KHz antenna coupling to electric power contact net wire, through electric power contact net wire with 400KHz signal transmission to whole communication interval, 450MHz signal of transmission of adjacent two intervals retransmission platform, there is 1/3 crossed signal intensity at the signal field intensity coverage area more than 10 dBuV. The utility model discloses be applied to in the weak spot tunnel interval, carry out interconversion's technique based on the 450MHz 400KHz signal of interval repeater platform, solved the weak spot tunnel interval railway 450MHz wireless communication system field intensity and covered the problem.

Description

A field intensity covers communication system for railway weak field interval
Technical Field
The utility model relates to a mobile communication technical field, specifically speaking relates to a field intensity covers communication system and communication method for railway weak field interval.
Background
At present, most of wireless train dispatching communication systems in electrified railway sections in China use 450MHz frequency bands for communication, because the terrain of China is a plurality of mountainous regions and hills, half of railway lines are in mountainous region tunnels, the railway sections are blind areas of radio communication, the traditional scheme mainly adopts modes of repeaters, leakage cables or optical fiber repeaters and the like for weak field reinforcement so as to meet the use requirement of wireless train dispatching communication, but the equipment has high investment and maintenance cost, large engineering quantity and difficult installation, debugging and maintenance.
With the increasing development of social economy, the railway transportation volume is larger and larger, so how to reliably ensure the safety of railway transportation under the conditions of increasing the railway transportation capacity, increasing the train speed and increasing the transportation density becomes a problem which needs to be solved urgently at present. The wireless train dispatching communication system plays a vital role in railway safety transportation, and effective field intensity coverage of a weak field tunnel interval is one of railway transportation safety guarantees. By arranging the interval forwarding station in the weak field tunnel interval, the investment can be reduced by more than half, the effective field intensity coverage in the weak field tunnel interval is realized, the smooth communication service is provided for railway users, and the safety and the reliability of railway communication are improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model aims to provide a field intensity coverage communication system and a communication method thereof for railway weak field intervals, so as to overcome the defects in the prior art.
In order to achieve the above object, the present invention provides a field intensity coverage communication system for a railway weak field section, which comprises a plurality of section repeaters arranged in the whole communication section; each interval repeater is connected with communication terminal equipment through a 450MHz antenna so as to enable the interval repeaters and the communication terminal equipment to communicate through 450MHz signals; each interval repeater is coupled to a power contact net lead through a 400KHz antenna so as to enable the interval repeaters to communicate through 400KHz signals; the interval forwarding station converts 450MHz signals into 400KHz signals, couples the 400KHz signals to the electric power contact net lead in space, and sends the 400KHz signals to the whole communication interval through the electric power contact net lead; the coverage area of 450MHz signals emitted by two adjacent transponding stations with signal strength above 10dBuV should be 1/3 crossed signal field strength.
By adopting the technical scheme, the interval forwarding table is arranged in the whole communication interval, particularly, the transmission device is applied to the railway weak field tunnel interval, 400KHz signal transmission is carried out by utilizing an electric power contact network cable, and the technology of interconversion is carried out on 450MHz/400KHz signals based on the interval forwarding table, so that the problem of field intensity coverage of the railway 450MHz wireless communication system in the weak field tunnel interval is effectively solved.
As a further explanation of the field intensity coverage communication system of the present invention, preferably, the interval forwarding station is a fixed interval forwarding station, the interval forwarding station adopts an outdoor cabinet structure, the interval forwarding station is installed in the tunnel in a wall-hanging manner, and the interval forwarding station is installed on the telegraph pole in the interval of installation in a hoop locking manner; the 450MHz antenna adopts a dual-directional yagi antenna to cover towards two directions of a railway, and the 400kHz antenna adopts a 400kHz rod-shaped coupling sub-antenna; the power supply of the fixed type interval forwarding platform adopts a station remote power supply mode and is provided with a standby battery to support the power-off continuous work of the fixed type interval forwarding platform for more than 24 hours.
As a further explanation of the field intensity coverage communication system of the present invention, preferably, the interval relay station is a portable interval relay station, and the interval relay station is provided with a tripod support device; the 400kHz antenna uses a pull rod antenna, the 450MHz antenna uses an omnidirectional antenna, the 450MHz antenna is arranged in the range of 1 meter on both sides of a rail, the total height from the ground to the top end of the 450MHz antenna is within 2.8 meters, and objects with the height of more than 1.2 meters cannot be arranged in the range of 1 meter around the interval repeater; the power supply of the portable repeater adopts a 12V/20Ah high-capacity lithium battery for power supply so as to ensure 10 hours of continuous working time.
As a further explanation of the field intensity coverage communication system of the present invention, preferably, the interval forwarding station includes a 450MHz channel machine and a 400KHz channel machine, and both the 450MHz channel machine and the 400KHz channel machine work in the same frequency simplex mode.
As a further explanation of the field intensity coverage communication system of the present invention, preferably, the interval repeater includes a microphone and a speaker, the microphone is in an on-hook state, and the interval repeater operates in a repeating state; the transmitter is in off-hook state, and the local repeater can communicate with other communication terminals at this time.
In order to achieve the above object, the present invention further provides a communication method using the field intensity coverage communication system for railway weak field section, the communication method comprising the following steps: step S1): the communication terminal equipment transmits 450MHz signals and sends out communication requests; step S2): the 450MHz signal is received by the transponding station in the region covered by the signal field intensity, the 450MHz signal is converted into a 400KHz signal, and the 400KHz signal is wirelessly transmitted; step S3): the interval forwarding station spatially couples the 400KHz signal to the electric power contact net lead, and the 400KHz signal is transmitted to the whole communication interval through signal propagation of the electric power contact net lead; step S4): other interval transfer stations receive 400KHz signals, convert the signals into 450MHz signals and wirelessly transmit the 450MHz signals; step S5): all communication equipment under the same frequency in the field intensity range of the forwarding station in other intervals receives the communication request, and the called communication terminal equipment responds to establish communication connection between the communication terminal equipment.
As a further explanation of the communication method, preferably, the interval forwarding station receives the 450MHz signal, before starting to forward the 450MHz signal to the 400KHz signal, it is determined first whether there are other interval forwarding stations in the 400KHz signal transmitting state to occupy the 400KHz communication channel, if so, the 450MHz signal is not forwarded, but the 400KHz signal is received and forwarded as the 450MHz signal, and if not, the 450MHz signal is forwarded to the 400KHz signal.
By adopting the technical scheme, the situation that one mobile communication terminal simultaneously starts a plurality of forwarding stations to forward 450MHz signals into 400KHz signals to cause same frequency interference of 400KHz signal transmission channels is prevented.
As a further explanation of the communication method of the present invention, preferably, the communication terminal device is located in the 450MHz field intensity cross coverage range of two adjacent transponding stations, when the 450MHz signal of the communication terminal device is received by two adjacent transponding stations at the same time, the 400KHz signal is preferentially retransmitted by the transponding station at the interval with relatively large receiving field intensity, and the 400KHz signal is retransmitted after the 200ms-500ms delay of the adjacent transponding station at the interval.
By adopting the technical scheme, one adjacent interval forwarding station can be ensured to be started firstly, when the other interval forwarding station detects that the forwarding station starts to forward 400KHz signals, the interval forwarding station is locked in a state of receiving the 400KHz signals, and the problem that other operators in a certain range of the two interval forwarding stations cannot communicate with the operators due to the fact that the two interval forwarding stations receive the 450MHz signals of the mobile communication terminal and forward the 400KHz signals at the same time is solved.
As a further explanation of the communication method of the present invention, preferably, the interval forwarding station is configured to forward the train tail FFSK data in a manner of FFSK signal regeneration while ensuring the field intensity coverage.
By adopting the technical scheme, the reliability of train tail data communication is improved, and the safe running of the train is ensured.
As a further description of the communication method of the present invention, it is preferable that the entire communication interval has a field intensity coverage of 10 km or more.
The utility model has the advantages as follows: the utility model discloses dispose the interval platform of forwardding in whole communication interval, in particular, be applied to railway weak field tunnel interval in, utilize electric power contact network line to carry out 400KHz signal transmission, not influenced by topography, be an effectual current resource of utilization, practice thrift the construction maintenance cost's weak field interval field intensity covering method, 450MHz/400KHz signal based on interval platform of forwardding carries out interconversion's technique, realize the field intensity covering of 450MHz railway radio communication weak field tunnel district, the problem of weak field tunnel interval railway 450MHz radio communication system field intensity covering has effectively been solved, the wireless train dispatching of railway has been solved, railway operation personnel, the communication demand of 450 MHz's radio communication problem between the reconnection locomotive driver. The interval forwarding station has two forms of a fixed type and a portable type, and can be selected according to different use scenes. The field intensity covering method based on the interval repeater can theoretically realize the field intensity covering of more than 10 kilometers in the whole communication interval.
Drawings
Fig. 1 is a schematic structural diagram of a field intensity coverage communication system for a railway weak field interval according to the present invention;
fig. 2 is a schematic diagram of the field intensity coverage of 450MHz radio signals of the interval repeater of the present invention;
fig. 3 is a schematic view illustrating an application of the field intensity coverage communication system of the present invention in a wireless train dispatching communication system;
fig. 4 is a schematic view of the application of the field intensity coverage communication system of the present invention in the cargo train tail safety protection communication system;
fig. 5 is a schematic view of the application of the field intensity coverage communication system of the present invention in a construction protection communication system;
fig. 6 is a schematic diagram illustrating an application of the field intensity coverage communication system of the present invention in a locomotive reconnection communication system;
fig. 7 is a flowchart of a communication method of the field intensity coverage communication system for railway weak field intervals according to the present invention.
Detailed Description
In order to further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.
As shown in fig. 1, a field intensity coverage communication system for railway weak field intervals comprises a plurality of interval repeater stations 1 arranged in the whole communication interval; each interval repeater 1 is connected with the communication terminal equipment 2 through a 450MHz antenna, so that the interval repeater 1 and the communication terminal equipment 2 communicate through 450MHz signals; the communication terminal device 2 may be a mobile communication device or a fixed communication device. Each interval repeater 1 is coupled to a power contact net lead 3 through a 400KHz antenna, so that the interval repeaters 1 communicate through 400KHz signals; the interval repeater 1 converts 450MHz signals into 400KHz signals, the interval repeater 1 spatially couples the 400KHz signals to an electric power contact net lead 3, the 400KHz signals are transmitted to the whole communication interval through the electric power contact net lead 3, especially, the interval repeater 1 is arranged in the weak field tunnel interval, the electric power contact net lead is used for transmitting the 400KHz signals, the method is not influenced by the terrain, and the method is an effective weak field interval field intensity covering method which utilizes the existing resources and saves the construction and maintenance cost. The interval repeater 1 comprises a 450MHz channel machine and a 400KHz channel machine, and the 450MHz channel machine and the 400KHz channel machine work in a same-frequency simplex mode. The interval forwarding station 1 is provided with a microphone and a loudspeaker, the microphone is in an on-hook state, and the interval forwarding station 1 works in a forwarding state; when the telephone transmitter is in an off-hook state, the local repeater 1 can communicate with another communication terminal. The interval forwarding station also has the functions of decoding and regenerating and encoding the column tail data, and effectively increases the signal intensity of the column tail data signals and effectively improves the anti-jamming capability and reliability of the transmission of the column tail data in the weak field interval by decoding the received column tail data and then coding, restoring and forwarding the column tail data again.
In the whole weak field tunnel region, the installation position of the interval repeater 1 is based on field intensity test. The coverage area of the signal field intensity of 450MHz signals emitted by two adjacent transponding stations 1 with the signal intensity of more than 10dBuV should be 1/3 crossed signal field intensity. As shown in fig. 2, when the mobile communication terminal is ensured to be in the field intensity cross coverage area of two adjacent transponding stations, the 450MHz signal transmitted by the mobile communication terminal can be reliably received and retransmitted by one of the transponding stations.
The interval forwarding station has two forms of a fixed type and a portable type, and can be selected according to different use scenes. When the interval forwarding station 1 is a fixed interval forwarding station, an outdoor cabinet structure is adopted, a wall-hanging installation mode is adopted in a tunnel, and an installation mode that an anchor ear is locked on a telegraph pole is adopted in a bright area; the 450MHz antenna adopts a dual-directional yagi antenna to cover towards two directions of a railway, and the 400kHz antenna adopts a 400kHz rod-shaped coupling sub-antenna; the power supply of the fixed type interval forwarding platform adopts a station remote power supply mode and is provided with a standby battery to support the power-off continuous work of the fixed type interval forwarding platform for more than 24 hours. The fixed mounting mode is applicable to the interval that needs solve the weak field communication problem for a long time, and the equipment fixing test is once accomplished, and it is convenient to use, can realize the field intensity coverage of whole interval more than 10 kilometers theoretically. When the interval repeater 1 is a portable interval repeater, self-provided tripod supporting equipment is adopted; the 400kHz antenna uses a telescopic antenna, the 450MHz antenna uses an omnidirectional antenna, the 450MHz antenna is arranged in the range of 1 meter on both sides of a rail, the total height from the ground to the top end of the 450MHz antenna is within 2.8 meters, and objects with the height exceeding 1.2 meters cannot exist in the range of 1 meter around the interval repeater 1. The portable interval repeater has relatively short communication distance due to the lower installation position, can ensure the field intensity coverage within the range of 3 kilometers by 450MHz wireless signals, and is mainly suitable for temporary railway construction safety protection fields such as mountainous areas, tunnels and the like. The power supply of the portable repeater adopts a 12V/20Ah high-capacity lithium battery for power supply so as to ensure 10 hours of continuous working time.
As shown in fig. 1 and fig. 7, a communication method for covering a communication system with the field intensity for the railway weak field interval includes the following steps:
step S1): the communication terminal device 2 transmits a 450MHz signal, and issues a communication request.
Step S2): in the weak field tunnel interval, the interval repeater 1 in the signal field intensity coverage area receives the 450MHz signal, converts the 450MHz signal into a 400KHz signal, and wirelessly transmits the signal.
Step S3): the interval repeater 1 couples the 400KHz signal space to the electric power contact net lead 3, and through signal propagation of the electric power contact net lead 3, the 400KHz signal is transmitted to the whole communication interval.
Step S4): the repeater 1 in other intervals receives the 400KHz signal, converts the 400KHz signal into a 450MHz signal, and wirelessly transmits the 450MHz signal.
Step S5): all communication equipment under the same frequency in the field intensity range of the forwarding station 1 in other intervals receives the communication request, and the called communication terminal equipment 2 responds to the communication request, so that the communication connection between the communication terminal equipment 2 is established.
Based on the field intensity coverage scheme of the interval repeater, the field intensity coverage of more than 10 kilometers of the whole communication interval can be theoretically realized. The method is suitable for application scenes of railway wireless train dispatching communication, railway construction protection communication, cargo locomotive train tail communication, head-tail locomotive platform communication of the multi-locomotive and the like in weak fields such as tunnels or mountainous areas.
In order to prevent one mobile communication terminal from starting a plurality of forwarding stations simultaneously to forward 450MHz signals to 400KHz signals to cause same-frequency interference of 400KHz signal transmission channels, firstly, the installation position of field equipment is considered; secondly, the threshold of a 450MHz channel machine can be adjusted; finally, the interval forwarding station 1 receives the 450MHz signal, before starting forwarding the 450MHz signal to the 400KHz signal, it is firstly determined whether there is another interval forwarding station in the 400KHz signal transmission state occupying the 400KHz communication channel, if yes, the 450MHz signal is not forwarded, but the 400KHz signal is received and forwarded to the 450MHz signal, if not, the 450MHz signal is forwarded to the 400KHz signal. Here, it can be first determined whether there are other forwarding stations in the 400KHz signal transmission state occupying the 400KHz communication channel by software algorithm technology. The software algorithm technology is a processor chip in an interval forwarding station, an ADC module is used for sampling the strength value of a field intensity signal output by a 400KHz channel machine at equal intervals, and the field intensity signal is sent to a field intensity judgment logic module after being subjected to channel filtering by a raised cosine FIR filter to judge whether the strength value reaches a set threshold value or not. I.e., whether the 400KHz channelizer is actively receiving the carrier signal.
When a constructor works on site, if the communication site of an operator is just in the crossed coverage range of the 450MHz field intensity of two adjacent interval forwarding stations, namely the communication terminal device 2 is in the crossed coverage range of the 1450MHz field intensity of the two adjacent interval forwarding stations, the two adjacent interval forwarding stations 1 can simultaneously receive the 450MHz signal of the communication terminal device 2 and simultaneously forward the 450MHz signal into a 400KHz signal, so that other operators in a certain range of the two interval forwarding stations cannot communicate with the operator, the interval forwarding stations are judged by adopting position and field intensity software technology, the interval forwarding stations 1 with relatively large receiving field intensity are preferentially forwarded into the 400KHz signal, the adjacent interval forwarding stations 1 are delayed for 200ms to 500ms and then forwarded into the 400KHz signal, thus the adjacent interval forwarding stations can be ensured to be started firstly, when the other interval forwarding stations detect that the forwarding stations have started to forward the 400KHz signal, the interval repeater is locked in a state of receiving 400KHz signals, and the problem can be completely solved.
As shown in fig. 3, in the railway wireless train dispatching communication weak field tunnel interval, when the interval repeater station receives the 450MHz signal transmitted by the locomotive radio station, the 400KHz signal is converted into the electric power contact net wire in a wireless coupling manner, the 400KHz signal is transmitted to the interval repeater station near the station through the electric power contact net, the interval repeater station converts the received 400KHz signal into the 450MHz signal and transmits the 450MHz signal to the station radio station, the locomotive joint control conversation between the station and the weak field area is realized, and the requirement of wireless train dispatching communication is ensured.
As shown in fig. 4, in the weak field tunnel region of railway construction protection communication, when the constructor of the construction railway is in the weak field region, the farthest communication distance between the mobile terminals can only reach about 300 meters, and the requirements of normal communication and safety protection communication distance cannot be met. The portable interval repeater station is adopted to carry out field intensity coverage in the construction protection communication weak field interval, tripod supporting equipment is adopted to be placed in a proper position, field intensity coverage in a range of 3 kilometers is realized, smooth and easy communication of a construction site mobile terminal is guaranteed, meanwhile, long-distance 400KHz signal transmission is carried out through an electric power contact net, normal communication between constructors and safety protection personnel outside 1-4 kilometers is realized, and the construction protection level is improved.
As shown in fig. 5, in weak field areas such as railway tunnels, the cargo train tail locomotive platform and the train tail host cannot normally communicate, so that the wind pressure state at the train tail cannot be queried, and potential safety hazards of driving exist. The interval forwarding station adopts the FFSK signal regeneration mode to forward the train tail FFSK data while ensuring the field intensity coverage, thereby improving the reliability of train tail data communication and ensuring the safe running of the train.
As shown in fig. 6, in a weak field section such as a railway tunnel, when a train is drawn by two locomotives in a 1+1 mode in a reconnection mode (one is pulled in front and the other is pushed in back), the locomotives need reconnection communication in the running process to ensure synchronous control of the locomotives, normal communication cannot be performed between the two locomotives in the weak field section, and serious driving accidents may be caused. The transfer station is reasonably placed in the weak field area, so that smooth communication of the multi-locomotive can be ensured, and traffic safety accidents can be prevented.
It should be noted that the above mentioned embodiments and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims (5)

1. A field intensity coverage communication system for a railway weak field interval is characterized by comprising a plurality of interval repeater stations (1) arranged in the whole communication interval; wherein the content of the first and second substances,
each interval repeater (1) is connected with the communication terminal equipment (2) through a 450MHz antenna, so that the interval repeaters (1) and the communication terminal equipment (2) communicate through 450MHz signals;
each interval repeater (1) is coupled to a power contact net lead (3) through a 400KHz antenna, so that the interval repeaters (1) communicate with each other through 400KHz signals; the interval forwarding station (1) converts 450MHz signals into 400KHz signals, the interval forwarding station (1) spatially couples the 400KHz signals to an electric power contact net lead (3), and the 400KHz signals are sent to the whole communication interval through the electric power contact net lead (3);
the coverage area of the signal field intensity of 450MHz signals emitted by two adjacent intermediate repeater stations (1) with the signal intensity of more than 10dBuV should be 1/3.
2. The field intensity coverage communication system according to claim 1, wherein the regional repeater (1) is a fixed regional repeater, the regional repeater (1) adopts an outdoor cabinet structure, the regional repeater (1) is installed in a tunnel in a wall-hanging manner, and the regional repeater (1) is installed on a telegraph pole in a bright region in a hoop locking manner;
the 450MHz antenna adopts a dual-directional yagi antenna to cover towards two directions of a railway, and the 400kHz antenna adopts a 400kHz rod-shaped coupling sub-antenna;
the power supply of the fixed type interval forwarding platform adopts a station remote power supply mode and is provided with a standby battery to support the power-off continuous work of the fixed type interval forwarding platform for more than 24 hours.
3. The field intensity coverage communication system of claim 1, wherein the local repeater (1) is a portable local repeater, and the local repeater (1) is provided with a tripod supporting device;
the 400kHz antenna uses a pull rod antenna, the 450MHz antenna uses an omnidirectional antenna, the 450MHz antenna is arranged in the range of 1 meter on both sides of a rail, the total height from the ground to the top end of the 450MHz antenna is within 2.8 meters, and objects with the height of more than 1.2 meters cannot exist in the range of 1 meter around the interval repeater (1);
the power supply of the portable repeater adopts a 12V/20Ah high-capacity lithium battery for power supply so as to ensure 10 hours of continuous working time.
4. A field intensity coverage communication system according to any one of claims 1-3, characterized in that the inter-zone repeater (1) comprises a 450MHz channel machine and a 400KHz channel machine, and the 450MHz channel machine and the 400KHz channel machine both work in a same frequency simplex mode.
5. A field intensity coverage communication system according to any of claims 1-3, wherein the inter-zone repeater (1) comprises a microphone and a loudspeaker, the microphone is in an on-hook state, and the inter-zone repeater (1) operates in a repeating state; when the transmitter is in an off-hook state, the local repeater (1) can communicate with other communication terminals.
CN201921858480.XU 2019-10-31 2019-10-31 A field intensity covers communication system for railway weak field interval Active CN211429529U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921858480.XU CN211429529U (en) 2019-10-31 2019-10-31 A field intensity covers communication system for railway weak field interval

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921858480.XU CN211429529U (en) 2019-10-31 2019-10-31 A field intensity covers communication system for railway weak field interval

Publications (1)

Publication Number Publication Date
CN211429529U true CN211429529U (en) 2020-09-04

Family

ID=72284587

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921858480.XU Active CN211429529U (en) 2019-10-31 2019-10-31 A field intensity covers communication system for railway weak field interval

Country Status (1)

Country Link
CN (1) CN211429529U (en)

Similar Documents

Publication Publication Date Title
CN102127998B (en) Screen door linkage control system
CN101511091A (en) Emergency communication system for mine production
CN109474935A (en) A kind of tunnel microwave communication Transmission system and method
CN105141343A (en) Cable tunnel positioning and broadcasting system employing VLC-PLC technologies
CN201365252Y (en) Emergency communication system for mine production
CN102142864B (en) Broadband communication device for long-distance high-speed power line
CN202014336U (en) Digital mobile wireless skynet system
CN211429529U (en) A field intensity covers communication system for railway weak field interval
CN207559995U (en) Digital radio Heibei provincial opera simulcasting system
CN111416651A (en) Frequency shift relay device for wireless shunting locomotive signal and monitoring system
CN203466972U (en) Moderate-distance wireless relay type electric power emergency communication transmission link system
CN205122759U (en) High -speed railway mobile communication network covers system
CN110730462A (en) Field intensity coverage communication system and method for railway weak field interval
CN102291570B (en) For wireless supervisory control system and the method for subway
CN105059330A (en) Equipment, system and method for ground reinforcement of combined train
CN210327573U (en) Coaxial network 5G signal amplifier system
CN204741449U (en) Emergency communication car
CN201369606Y (en) Power supply switching device for optical fiber repeater far-end machine
CN201369725Y (en) Wireless communication system for emergency and disaster relief of mine
CN210640734U (en) Power line monitoring and wireless extension device
CN110611695B (en) Data transmission system and vehicle-mounted terminal of rail transit rolling stock
CN201846431U (en) Wireless audio and video transmission system
CN204956523U (en) A ground reinforcement equipment and system for combined train
JPH07107634A (en) Method and apparatus for maintaining/monitoring transmission line
CN107317597A (en) A kind of field Radio Network System

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant