CN116367114B - Communication wireless system of urban rail transit - Google Patents
Communication wireless system of urban rail transit Download PDFInfo
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- CN116367114B CN116367114B CN202310184943.3A CN202310184943A CN116367114B CN 116367114 B CN116367114 B CN 116367114B CN 202310184943 A CN202310184943 A CN 202310184943A CN 116367114 B CN116367114 B CN 116367114B
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- 230000010287 polarization Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 102100024462 Cyclin-dependent kinase 4 inhibitor B Human genes 0.000 claims description 3
- 101000980919 Homo sapiens Cyclin-dependent kinase 4 inhibitor B Proteins 0.000 claims description 3
- 101100473189 Schizosaccharomyces pombe (strain 972 / ATCC 24843) rpn1 gene Proteins 0.000 claims description 3
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- 238000005520 cutting process Methods 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010295 mobile communication Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 abstract description 7
- 230000008054 signal transmission Effects 0.000 abstract description 6
- 241000576451 Dimetra Species 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0003—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a communication wireless system of urban rail transit, which is a Motorola Dimetra IP compact/expandable TETRA digital trunking system, comprising a central device, a base station device, an optical repeater and a passive device, wherein the central device comprises a network structure and a general service platform; a base station apparatus, comprising: RFDS, power PSU, TSC, BR and EAS; the optical repeater comprises a near-end machine and a far-end machine; the passive device comprises a power divider, a coupler, a feeder line, a leaky cable and an antenna, wherein a direct coupling mode is adopted between the near-end machine and the base station, and the information source is pure; the transmission distance is long by using optical fiber transmission; the optical fiber link signal transmission adopts a wavelength division multiplexing mode, so that optical fiber resources are saved, and the field intensity coverage problem in a daily inspection warehouse and a joint maintenance warehouse of an ultra-long section and a vehicle section is solved by arranging an optical fiber repeater in each station section and the vehicle section.
Description
Technical Field
The invention relates to the technical field of communication wireless systems, in particular to a communication wireless system for urban rail transit.
Background
Urban rail transit is the backbone of urban public transportation and has the characteristics of energy conservation, land conservation, large transportation capacity, less pollution and safety. Belongs to a green environment-friendly traffic system, accords with the principle of sustainable development, and is particularly suitable for large and medium cities; along with the acceleration of urban construction pace, the central city continuously radiates to the periphery, and the urgency of rail traffic construction is also increased; china has formed a track traffic construction market with the largest regulation and the fastest development in the world; the development dynamics of the subways and the light rails in China are observed, and the market prospect of the rail transportation and the equipment manufacturing thereof in China is wide within 5-10 years in the future. In order to solve the field intensity coverage problem in a daily inspection warehouse and a joint overhaul warehouse of an ultra-long section and a vehicle section, a communication wireless system of urban rail transit is provided for solving the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a communication wireless system for urban rail transit, which is used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a communication wireless system of urban rail transit comprises a central device, a base station device, an optical repeater and a passive device;
the central equipment comprises a network structure and a general service platform;
a base station apparatus, comprising: RFDS, power PSU, TSC, BR and EAS;
the optical repeater comprises a near-end machine and a far-end machine;
and the passive device comprises a power divider, a coupler, a feeder line, a leaky cable and an antenna.
As a further scheme of the invention: the network structure consists of several parts: (1) a call processing subsystem, (2) a data subsystem, (3) a scheduling subsystem, (4) a telephone interconnection subsystem, (5) a transmission network subsystem, and (6) a network management subsystem.
As a further scheme of the invention: the universal service platform adopts 1 universal server platform to reduce the required standby equipment; the general server platform is HP DL 360G 9, which is used as a PZS, SZS, PMS, PDS, MTIG server in the system, and the operating system of the server is Linux.
As a further scheme of the invention: the RFDS is a radio frequency transmission system and consists of a combiner and a filter unit;
the combiner is called a combiner and is divided into a resonance combiner and a hybrid combiner; the insertion loss of the hybrid combiner is larger, and the channel interval of the transmitter is not limited; the resonant combiner is divided into an automatic tuning resonant combiner and a manual tuning resonant combiner, the ATCC is normally used, the ATCC can combine two paths of radio frequency signals into one path and automatically tune the frequency, and the resonant combiner is only used for an MTS4 base station and cannot be used for an MTS2 base station;
three filters, a duplexer, a preselect filter and a post filter; the bandwidth of all filters is 15MHz, the TX and RX receiving and transmitting intervals of the duplexer are 45MHz, and the filter accords with the TETRA standard; the duplexer is composed of two band-pass filters, one of the two band-pass filters processes a transmitting signal and the other of the two band-pass filters processes a receiving signal, the bandwidths of the two filters are 15MHz, the duplex frequency interval between the transmitting frequency and the receiving frequency is 45MHz, wherein the transmitting frequency is higher, and the duplexer integrates a receiver multipath coupler and a digital power meter; the preselection filter is a bandpass filter, which has a bandwidth of 15MHz, and which integrates a receiver multipath coupler, allowing only "receiver" signals to pass; the post-filter may support a non-duplex configuration, allowing only "transmitter" signals to pass, and the post-filter integrates a digital power meter.
As a further scheme of the invention: two layers of the base station are respectively provided with a PSU, each PSU supplies power for the TSCs of the upper layer and the lower layer, and a single BR is supplied power by the PSU of the same layer, which means that when one PSU fails, the TSCs of the same layer can continue to work and the BR cannot work normally;
the TSC is responsible for controlling the resources of the Base station, including allocating frequency and time slot to the mobile station, the TSC is integrated with a global positioning system, responsible for receiving the positioning signal used for generating the timing signal of the high-precision system, the TSC communicates with the transceiver through the 10Base2 Ethernet interface, communicate with the network through X.21 or E1 link;
the transceiver BR provides the functions of signal transmission and reception, signal processing and modulation, etc., in order to realize these functions, the transceiver integrates a transceiver controller, a receiver and an exciter and a PA, the BRC is the main control unit of the transceiver, the BRC is responsible for providing signal processing and operation control functions for other modules of the transceiver, the RCV can support 3 paths of signal reception, i.e. each BR supports at most three diversity reception, the power amplifier cooperates with the exciter EXC to provide the signal transmission function for the transceiver, the PA receives the low-level radio frequency signal transmitted by the exciter, amplifies the signal and transmits the signal through the radio frequency output connector.
As a further scheme of the invention: the power divider mainly aims at dividing the signal into a plurality of parts for different coverage areas to use, and the common active power division, the common active power division and the common active power division are mainly indicated by distribution loss and insertion loss, wherein the distribution loss refers to the reduction of signal power compared with an original input signal after ideal power distribution, and the insertion loss refers to the reduction of the power output by the actual power divider after the signal power passes through the actual power divider and the actual value of the distribution loss subtracted from the reduction of the signal power compared with the original input signal.
As a further scheme of the invention: the coupler has the main function of dividing the signal unevenly into two parts, and the types of the coupler are more, and are usually 5dB, 10dB, 15dB, 20dB, 25dB, 30dB and the like. The main indexes are as follows: coupling degree, insertion loss, which is the direct difference between the power output from the coupling port and the power input through the coupler, and insertion loss, which is the value obtained by subtracting the distribution loss from the reduced value of the power output from the coupling port.
As a further scheme of the invention: the feeder is a radio frequency coaxial cable, the radio frequency cable is selected as a foam insulation cable, the reliability is high, the performance is excellent, and the feeder can be used for various wireless communication systems and has the following characteristics:
(1) Good mechanical properties;
(2) Low attenuation;
(3) Low reflection coefficient and low VSWR;
(4) High rated power;
(5) Low intermodulation;
(6) Reliable work can be realized in a poor environment;
(7) Good shielding effect.
As a further scheme of the invention: the main indexes of the antenna comprise: gain, polarization direction and standing wave ratio,
(1) Gain: the difference in electric field strength between a particular antenna and an ideal point source antenna within the coverage area; the general omni-directional antenna is about 2dBi, and the plate-shaped orientation is as follows: 4-18 dBi, etc., the gain is generally expressed in dBi and dBD units;
(2) Polarization direction: typically land mobile communications are only 2 types, vertical and horizontal;
(3) Standing wave ratio: the matching capability of the antenna input port is an important sign for measuring the antenna technology and quality level, generally 1.2 to 1.5, and the directional antenna is slightly higher by 1.2 to 2.0.
As still further aspects of the invention: leaky cables generally use a thin copper sheet as an outer conductor, and electromagnetic energy can partially penetrate from the inside of the cable to the outside of the cable by cutting slots in different forms in the outer conductor, and of course, the electromagnetic energy outside the cable is induced into the cable.
Compared with the prior art, the invention has the beneficial effects that: according to the communication wireless system of urban rail transit, a direct coupling mode is adopted between a near-end machine and a base station, so that the information source is pure; the transmission distance is long by using optical fiber transmission; the optical fiber link signal transmission adopts a wavelength division multiplexing mode, so that optical fiber resources are saved; the system has the optical path gain AGC function, and is adaptive to different optical link loss working environments; the maximum support of the near-end machine is 1 to 8, namely one near-end machine is provided with 8 far-end machines at most; the near-end machine has a power supply backup function, realizes non-transient and uninterrupted backup after power failure, and improves the reliability of the system; the remote machine has the functions of power amplifier module backup and power module backup, effectively improves the reliability and maintenance flexibility of the system, ensures uninterrupted and transient-free access of backup power supply, and does not influence the system operation; gain, alarm threshold setting and state inquiry can be carried out on the near-end machine or the far-end machine through the portable computer. The internal FSK MODEM is uniformly configured, a user can finish setting and inquiring of the opposite end at the near-end machine or the far-end machine, uncapping connection is avoided, and engineering debugging is facilitated. Configuring wireless GSM MODEM or TCP/IP protocol network card data to be transmitted to a network management center for unified monitoring, and completing remote parameter setting and monitoring; the remote machine case adopts a cast aluminum full-sealed shell, has high heat dissipation design, is effectively waterproof, dampproof and anticorrosive, and is competent for all-weather operation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of a network structure according to the present invention.
Fig. 3 is a schematic structural diagram of a base station apparatus according to the present invention.
Fig. 4 is a schematic structural diagram of a passive device in the present invention.
Detailed Description
In one embodiment, as shown in fig. 1-4, a communication wireless system of urban rail transit is a Motorola Dimetra IP compact/scalable TETRA digital trunked system, and comprises a central device, a base station device, an optical repeater and a passive device;
the central equipment comprises a network structure and a general service platform;
a base station apparatus, comprising: RFDS, power PSU, TSC, BR and EAS;
the optical repeater comprises a near-end machine and a far-end machine;
the passive device comprises a power divider, a coupler, a feeder line, a drain cable and an antenna;
the network structure consists of several parts: (1) a call processing subsystem, (2) a data subsystem, (3) a scheduling subsystem, (4) a telephone interconnection subsystem, (5) a transmission network subsystem, and (6) a network management subsystem;
the call processing subsystem and the network management subsystem are composed of a zone control server main zone control server PZS, a standby zone control server SZS and a network management server PMS, wherein the PZS and the SZS are mutually backup, the data of the PZS and the SZS are consistent, and ZC control local data is stored; the network management server PMS contains UCS, ZDS, UEM, ATR, ZSS five service databases:
UCS configures service for user;
ZDS serves regional data;
UEM is the alarm data service;
ATR is voice traffic routing service;
ZSS is an intra-area data statistics service;
the data subsystem supports packet data service, short data service and letter text service; the system mainly comprises a packet data routing service PDR, a wireless network gateway service RNG, a short data routing service SDR, a GPRS gateway support node router GGSN and a boundary router BR; since the system is compact, the three services PDR, RNG, SDR are all installed on one PDS server;
the transmission network subsystem consists of four parts, namely a hot standby core gateway router, a hot standby local area network switch and a patch panel;
the core gateway router has wide area network interface and multicast function, supports multicast flow to realize group calling, and can send packets between different VLAN and multicast router to realize multicast call control;
the local area network switch, all servers, routers and clients provide Ethernet interfaces, equipment related to voice is connected to two switches at the same time, and when one switch fails, the other switch is switched to;
a patch panel providing an interface between the core router and the E1 wide area network, each patch panel having two sets of dual 62 pin high density E1 connectors, each set of connectors supporting up to 12E 1 relays, each patch panel together supporting up to 24 relays;
a telephone interconnection subsystem consisting of MTIG and echo canceller, MTIG providing transcoding between ACELP and PCM, one MTIG providing 30 channels and providing ringing of the telephone,
the dispatching subsystem consists of MCC7500 and CCGW, wherein the MCC7500 comprises GPIO, microphone, loudspeaker and other peripheral equipment, and the CCGW is a conventional channel gateway and is used for an interface between Dimeta IP and a conventional system;
the universal service platform adopts 1 universal server platform to reduce the required standby equipment; the universal server platform is HP DL 360G 9, and is used as a PZS, SZS, PMS, PDS, MTIG server in the system, and the operating system of the server is Linux;
the RFDS is a radio frequency transmission system and consists of a combiner and a filter unit;
the combiner is called a combiner and is divided into a resonance combiner and a hybrid combiner; the insertion loss of the hybrid combiner is larger, and the channel interval of the transmitter is not limited; the resonant combiner is divided into an automatic tuning resonant combiner and a manual tuning resonant combiner, the ATCC is normally used, the ATCC can combine two paths of radio frequency signals into one path and automatically tune the frequency, and the resonant combiner is only used for an MTS4 base station and cannot be used for an MTS2 base station;
three filters, a duplexer, a preselect filter and a post filter; the bandwidth of all filters is 15MHz, the TX and RX receiving and transmitting intervals of the duplexer are 45MHz, and the filter accords with the TETRA standard; the duplexer is composed of two band-pass filters, one of the two band-pass filters processes a transmitting signal and the other of the two band-pass filters processes a receiving signal, the bandwidths of the two filters are 15MHz, the duplex frequency interval between the transmitting frequency and the receiving frequency is 45MHz, wherein the transmitting frequency is higher, and the duplexer integrates a receiver multipath coupler and a digital power meter; the preselection filter is a bandpass filter, which has a bandwidth of 15MHz, and which integrates a receiver multipath coupler, allowing only "receiver" signals to pass; the post-filter can support a non-duplex configuration, only allows "transmitter" signals to pass through, and integrates a digital power meter;
two layers of the base station are respectively provided with a PSU, each PSU supplies power for the TSCs of the upper layer and the lower layer, and a single BR is supplied power by the PSU of the same layer, which means that when one PSU fails, the TSCs of the same layer can continue to work and the BR cannot work normally;
the TSC is responsible for controlling the resources of the Base station, including allocating frequency and time slot to the mobile station, the TSC is integrated with a global positioning system, responsible for receiving the positioning signal used for generating the timing signal of the high-precision system, the TSC communicates with the transceiver through the 10Base2 Ethernet interface, communicate with the network through X.21 or E1 link;
the transceiver BR provides the functions of signal transmission and reception, signal processing and modulation, and the like, in order to realize the functions, the transceiver integrates a transceiver controller, a receiver, an exciter and a PA, the BRC is a main control unit of the transceiver, the BRC is responsible for providing the signal processing and operation control functions for other modules of the transceiver, the RCV can support 3 paths of signal reception, namely, each BR supports three diversity reception at most, the power amplifier is matched with the exciter EXC, the signal transmission function is provided for the transceiver, the PA receives a low-level radio-frequency signal transmitted by the exciter, amplifies the signal and transmits the signal through a radio-frequency output connector;
the power divider is mainly used for dividing signals into a plurality of parts for different coverage areas to use, and the common active power division, the common active power division and the common active power division are mainly used for dividing loss and insertion loss, wherein the dividing loss refers to the amount of reduction of signal power compared with an original input signal after ideal power division, and the insertion loss refers to the actual value of subtracting the dividing loss from the amount of reduction of power output by the actual power divider after the signal power passes through the actual power divider; the specific parameters are as follows:
the coupler has the main function of dividing the signal unevenly into two parts, and the types of the coupler are more, and are usually 5dB, 10dB, 15dB, 20dB, 25dB, 30dB and the like. The main indexes are as follows: coupling degree, insertion loss, the coupling degree refers to the direct difference value between the power output from the coupling port and the power of the input signal through the coupler, and the insertion loss refers to the value obtained by subtracting the value of the distribution loss from the value of the signal power reduced from the signal power output from the output end through the coupler; the specific parameters are as follows:
the feeder is a radio frequency coaxial cable, the radio frequency cable is selected as a foam insulation cable, the reliability is high, the performance is excellent, and the feeder can be used for various wireless communication systems and has the following characteristics:
(1) Good mechanical properties;
(2) Low attenuation;
(3) Low reflection coefficient and low VSWR;
(4) High rated power;
(5) Low intermodulation;
(6) Reliable work can be realized in a poor environment;
(7) Good shielding effect;
the main indexes of the antenna comprise: gain, polarization direction and standing wave ratio,
(1) Gain: the difference in electric field strength between a particular antenna and an ideal point source antenna within the coverage area; the general omni-directional antenna is about 2dBi, and the plate-shaped orientation is as follows: 4-18 dBi, etc., the gain is generally expressed in dBi and dBD units;
(2) Polarization direction: typically land mobile communications are only 2 types, vertical and horizontal;
(3) Standing wave ratio: the matching capability of the antenna input port is an important mark for measuring the antenna process and quality level, generally 1.2 to 1.5, and the directional antenna is slightly higher by 1.2 to 2.0;
the leaky cable generally uses a thin copper sheet as an outer conductor, and electromagnetic energy can partially penetrate from the inside of the cable to the outside of the cable through cutting slots in different forms on the outer conductor, and of course, the electromagnetic energy outside the cable is also induced into the cable;
the parameters of the leaky cable are as follows:
it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Claims (6)
1. The communication wireless system of urban rail transit is characterized by comprising central equipment, base station equipment, an optical repeater and passive devices;
the central equipment comprises a network structure and a general service platform;
a base station apparatus, comprising: RFDS, power PSU, TSC, BR;
the optical repeater comprises a near-end machine and a far-end machine;
the passive device comprises a power divider, a coupler, a feeder line, a drain cable and an antenna;
the network structure is composed of the following parts: a call processing subsystem, a data subsystem, a scheduling subsystem, a telephone interconnection subsystem, a transmission network subsystem and a network management subsystem;
the universal service platform adopts 1 universal server platform to reduce the required standby equipment; the universal server platform is HP DL 360G 9, and is used as a PZS, SZS, PMS, PDS, MTIG server in the system, and the operating system of the server is Linux;
the RFDS is a radio frequency transmission system and consists of a combiner and a filter unit;
the combiner is divided into a resonance combiner and a hybrid combiner; the resonant combiner is divided into an automatic tuning resonant combiner and a manual tuning resonant combiner, the resonant combiner is an ATCC (automatic control device), the ATCC can combine two paths of radio frequency signals into one path and automatically tune the frequency, and the resonant combiner is only used for an MTS4 base station and cannot be used for an MTS2 base station;
three filters, a duplexer, a preselect filter and a post filter; the bandwidth of all filters is 15MHz, the TX and RX receiving and transmitting intervals of the duplexer are 45MHz, and the filter accords with the TETRA standard; the duplexer is composed of two band-pass filters, one of the two band-pass filters processes a transmitting signal and the other of the two band-pass filters processes a receiving signal, the bandwidths of the two filters are 15MHz, the duplex frequency interval between the transmitting frequency and the receiving frequency is 45MHz, wherein the transmitting frequency is higher, and the duplexer integrates a receiver multipath coupler and a digital power meter; the preselection filter is a band-pass filter which only allows the 'receiver' signal to pass, the bandwidth of the preselection filter is 15MHz, and the preselection filter integrates a receiver multipath coupler; the post-filter can support a non-duplex configuration, only allows "transmitter" signals to pass through, and integrates a digital power meter;
two layers of the base station are respectively provided with a PSU, each PSU supplies power for the TSCs of the two layers, and meanwhile, a single BR is supplied power by the PSU of the same layer, when one PSU fails, the TSCs of the same layer can continue to work and the BR cannot work normally;
the TSC is responsible for controlling the resources of the Base station, including allocating frequency and time slot to the mobile station, the TSC is integrated with a global positioning system, responsible for receiving the positioning signal used for generating the timing signal of the high-precision system, the TSC communicates with the transceiver through the 10Base2 Ethernet interface, communicate with the network through X.21 or E1 link;
the transceiver BR provides signal transmitting and receiving, signal processing and modulating functions, the transceiver integrates a transceiver controller, a receiver, an exciter and a PA, the BRC is a control unit of the transceiver, the BRC is responsible for providing signal processing and operation control functions for other modules of the transceiver, the RCV can support 3 paths of signal receiving, namely each BR supports three diversity receiving at most, the power amplifier is matched with the exciter EXC to provide signal transmitting function for the transceiver, the PA receives low-level radio frequency signals transmitted by the exciter, amplifies the signals and transmits the signals through a radio frequency output connector.
2. The communication wireless system of urban rail transit according to claim 1, wherein the power divider divides the signal into several parts for different coverage areas, and the two power divisions, the three power divisions and the four power divisions are the distribution loss and the insertion loss.
3. A communication radio system for urban rail transit according to claim 1, characterized in that the coupler is a division of the signal non-uniformity into two parts, the coupler type being 5dB and/or 10dB, 15dB, 20dB, 25dB, 30dB indicators: coupling degree, insertion loss, which is the direct difference between the power output from the coupling port and the power input through the coupler, is the value obtained by subtracting the distribution loss from the reduced value of the signal power from the output through the coupler.
4. A communication radio system for urban rail transit according to claim 1, wherein the feeder is a radio frequency coaxial cable.
5. A communication radio system for urban rail transit according to claim 1, characterized in that the antenna index comprises: gain, polarization direction and standing wave ratio,
(1) Gain: the difference in electric field strength between a particular antenna and an ideal point source antenna within the coverage area; the omni-directional antenna is 2dBi, and the plate-shaped orientation is as follows: 4-18 dBi are unequal, and gains are expressed by dBi and dBD as units;
(2) Polarization direction: land mobile communication is only 2 kinds of vertical and horizontal;
(3) Standing wave ratio: is the matching capability of the antenna input port, is a sign for measuring the antenna technology and quality level, and is 1.2 to 1.5, and the directional antenna is slightly higher by 1.2 to 2.0.
6. A communication radio system for urban rail transit according to claim 1, wherein the leaky cable is made of thin copper sheet as the outer conductor, and the electromagnetic energy is partly transmitted from inside the cable to outside the cable by cutting slots of different forms in the outer conductor, and the electromagnetic energy outside the cable is induced into the cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310184943.3A CN116367114B (en) | 2023-03-01 | 2023-03-01 | Communication wireless system of urban rail transit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310184943.3A CN116367114B (en) | 2023-03-01 | 2023-03-01 | Communication wireless system of urban rail transit |
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