CN108667481A - A kind of millimeter wave transceiver of rail vehicle ground wireless communication ground base station - Google Patents
A kind of millimeter wave transceiver of rail vehicle ground wireless communication ground base station Download PDFInfo
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- CN108667481A CN108667481A CN201810811002.7A CN201810811002A CN108667481A CN 108667481 A CN108667481 A CN 108667481A CN 201810811002 A CN201810811002 A CN 201810811002A CN 108667481 A CN108667481 A CN 108667481A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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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
- 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]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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Abstract
The invention belongs to millimetre-wave attenuator technical fields, are related to a kind of millimeter wave transceiver of rail vehicle ground wireless communication ground base station.The ground millimeter wave transceiver of the present invention, signal bandwidth 1GHz, the vehicle for reaching Gbit/s for rate the realization of high-speed communication system provide effective, reliable support.Modularization, unitized design are used, has shared function module to greatest extent, reduces the quantity and power consumption of equipment on bar, to reduce system Construction cost, facilitates design of system integration, test and commercialization；The millimeter wave module and microwave module being installed on bar are compact-sized by the way of perpendicular interconnection, and miniaturization reduces volume；It can be monitored in real time by system when work, support system calibration, fault pre-alarming and fault fast positioning, the signal power of transmitting terminal and the AGC of receiving terminal can be adjusted dynamically, it is more adaptable under Different climate, environmental condition, have certain engineering value, can be promoted to the solution of other rail transit field high-speed communications such as subway.
Description
Technical field
The invention belongs to millimetre-wave attenuator technical fields, are related to a kind of milli of rail vehicle ground wireless communication ground base station
Metric wave transceiver.
Background technology
Millimeter wave has been compatible with microwave and light wave between microwave (3~30GHz) and submillimeter wave (being more than 300GHz)
Some features.In recent years, due to the plurality of advantages that millimeter wave has, communication, radar, guidance, remote sensing technology etc. all
With important application.With the fast development of rail traffic (high ferro, subway), reliable, real-time, efficient width is provided for passenger
Band wireless network access services, also proposed Information-based Railway new requirement.On the one hand, the operation, security monitoring of train and
The information such as plant maintenance needs are transmitted to control centre in real time, meet the needs of road network real-time dynamic information transmission；On the other hand,
People need through various communication apparatus, and the moment keeps the connection with network.Millimetre-wave attenuator has in identical relative bandwidth
Lower absolute bandwidth is big, this means that the capacity of higher transmission rate and bigger；Higher frequency also implies that higher day
Line gain, smaller size, anti-interference are more preferable.Millimeter wave transceiver is millimeter wave transmitting module and receiving module, local oscillator
The millimeter wave microwave integrated circuit that module and microwave module etc. become one is the basis for constituting millimeter-wave communication system.
Domestic existing rail vehicle ground wireless communication system substantially GSM-R, WLAN and LTE is several；GSM-R is main
Based on second generation global system for mobile communications GSM, mature and reliable, but the system itself is narrowband systems, and data carrying capabilities have
Limit is only capable of meeting the scheduling of railway private radio and demand for control；WLAN technologies complete, technology maturation, low cost with industrial chain
The advantages that, but the data of screamer is not supported to switch, and it is operated in open frequency range 2.4GHz, it is vulnerable to such as personal heat
The interference such as point, bluetooth；LTE uses the special frequency ranges of 1.8GHz, and strong antijamming capability, maintainability performance is good, but does not support 100MHz
The above bandwidth and low-power consumption, coverage distance 100m~1km, networking cost are higher.Existing several mainstream schemes, even if using high
Contrast system or multiple access technology expand the capacity of communication system, improve the availability of frequency spectrum, it is also difficult to meet future communications development
Demand.
Invention content
The object of the present invention is to be brought for high speed data transfer under the growing high-speed mobile condition of rail traffic
" double height " problem new demand, and use the millimeter-wave technology different from existing solution, the object of the present invention is to provide
It is a kind of communicated based on rail transit field in ground base station millimeter wave transceiver under millimetre-wave attenuator technical system, as realization
The basis of millimeter wave high-speed communication between vehicle ground rapidly develops the lower Information-based Railway new epoch to adapt to rail traffic in recent years
Demand.
The technical scheme is that：
Ground millimeter wave transceiver provides a kind of millimeter wave transceiving front end being installed on Along Railway ground base station, is contacting
Each a set of millimeter wave transceiving channel on the left and right directions of net bar.Using modular mentality of designing, electricity in module and module is considered
Ground millimeter wave transceiver is divided into millimeter wave transceiving module, microwave module and ifd module three parts by the versatility on road；With
Vehicle-mounted millimeter wave transceiver is completed to get on the bus along track the relay transmission of millimeter-wave signal between ground jointly, and can monitor and control
The working condition of ground millimeter wave transceiver processed.
Millimeter wave transceiving module, including two sets of identical millimeter wave transceiving channels：Millimeter wave transmitting circuit -1, millimeter wave connect
Receive the millimeter wave transceiving channel -1 that circuit -1 forms and the millimeter wave that millimeter wave transmitting circuit -2, millimeter wave receiving circuit -2 form
Transceiver channel -2.Intermediate-freuqncy signal (the bandwidth that millimeter wave transmitting circuit -1 or millimeter wave transmitting circuit -2 input microwave module
1GHz) up-conversion and is sent into circulator to the millimeter wave frequency band of work after being amplified to required power, from ground-plane antenna to train vehicle
Car antenna on top is launched.Meanwhile ground-plane antenna receives the millimeter-wave signal (bandwidth 1GHz) of car antenna transmitting, warp
Enter millimeter wave receiving circuit -1 or millimeter wave receiving circuit -2 after circulator, intermediate-freuqncy signal downconverted to after signal is amplified,
It exports to microwave module.Two sets of millimeter wave transceiving channel time-sharing works of millimeter wave transceiving module, i.e. synchronization only have millimeter
Wave transceiver channel -1 works or millimeter wave transceiving channel -2 works, and milli is controlled by the system channel switching signal of microwave module input
Channel selecting when metric wave transceiver module works.
Microwave module includes four microwave treatment module, local oscillator module, power module, signal processing module function modules.
Microwave treatment module includes transmission channel and receiving channel, emits signal to the intermediate frequency from ifd module and removes ifd module
Received IF signal carry out temperature-compensating, amplification, filtering, the processing such as equilibrium, and by system channel switching signal control its with
The channel selecting connected between millimeter wave transceiving channel -1 or millimeter wave transceiving channel -2 and switching；Local oscillator module is received for millimeter wave
It sends out module and required local oscillation signal is provided；Power module by external input voltage be converted to millimeter wave transceiving module, microwave module,
With the voltage needed for local oscillator module and be respectively its power supply, and have the function of corresponding current detecting and power protection；Signal
Processing module is acquired and transmits to the monitoring information of ground millimeter wave transceiver.
Ifd module is the part intermediate-frequency circuit that can be integrated with digital-to-analog circuits such as base band, modulation /demodulation, including transmission channel
And receiving channel.It takes place frequently in transmission channel pair and penetrates the processing such as balanced signal progress, amplification, filtering；Receiving channel is to intermediate frequency simultaneously
Signal is received into processing such as automatic growth control, filtering, amplifications, provides demodulator required intermediate-freuqncy signal.
The millimeter-wave signal interface of ground millimeter wave transceiver uses WR-28 standard waveguides, local oscillation signal and intermediate-freuqncy signal
Interface uses coaxial connector, power supply and control interface to use feed-through capacitor.It is metallic shield in each modular structure
Box improves the anti-interference ability and dust tightness of circuit；Convenient for the system integration.Millimeter wave transceiving module and microwave module and annular
Device, antenna are positioned in the antenna house on bar；Ifd module is integrated with external modem, the base band being placed in compartment
In cabinet, and intermediate-freuqncy signal is connected by the way of Integrated Service Digital Network.
Beneficial effects of the present invention are that ground millimeter wave transceiver of the invention, signal bandwidth 1GHz reaches for rate
The vehicle of Gbit/s the realization of high-speed communication system provide effective, reliable support.It uses modularization, unitized set
Meter, has shared function module, has reduced the quantity and power consumption of equipment on bar to greatest extent, to reduce system Construction cost, side
Just design of system integration, test and commercialization；The millimeter wave module and microwave module being installed on bar use the side of perpendicular interconnection
Formula, compact-sized, miniaturization reduces volume；It can be monitored in real time by system when work, support system calibration, fault pre-alarming and event
Barrier quickly positioning, the signal power of transmitting terminal and the AGC of receiving terminal can be adjusted dynamically, under Different climate, environmental condition
It is more adaptable, have certain engineering value, can be pushed away to the solution of other rail transit field high-speed communications such as subway
Extensively.
Description of the drawings
Fig. 1 is ground millimeter wave transceiver logical construction schematic diagram；
Reference numeral：1. millimeter wave transceiving module, 2. microwave modules, 3. ifd modules, 101. millimeter wave transceiving channel -1,
102. millimeter wave transceiving channel -2；
Fig. 2 is the millimeter wave transceiving module schematic diagram of ground millimeter wave transceiver；
Reference numeral：101. millimeter wave transceiving channel -1,102. millimeter wave transceiving channel -2,111. millimeter wave transmitting electricity
Road -1,112. millimeter wave receiving circuit -1,121. millimeter wave transmitting circuit -2,112. millimeter wave receiving circuit -2,21. local oscillator mould
Block, 22. microwave treatment modules, 24. signal processing modules；
Fig. 3 is the millimeter wave transceiving module Standard schematic diagram of ground millimeter wave transceiver；
Reference numeral：1. intermediate frequency transmitting -1 (SMP interface) of input, 2. local oscillators input -1 (SMP interfaces), 3. local oscillators input -1
(SMP interfaces), 4. medium frequency receptions -1 (SMP interface) of output, 5. biasings/state -1 (M2.5 feed-through capacitors), 6. waveguide filters,
7. waveguide filter, 8. circulators, 9. intermediate frequencies transmitting -2 (SMP interfaces) of input, 10. local oscillators -2 (SMP interfaces) of input, 11.
Shake -2 (SMP interfaces) of input, 12. medium frequency receptions -2 (SMP interfaces) of output, 13. biasings/state -2 (M2.5 feed-through capacitors), and 14.
Waveguide filter, 15. waveguide filters, 16. circulators；
Fig. 4 is microwave module schematic diagram；
Reference numeral：1. millimeter wave transceiving module, 2. microwave modules, 3. ifd modules, 101. millimeter wave transceiving channel -1,
102. millimeter wave transceiving channel -2,111. millimeter wave transmitting circuit -1,112. millimeter wave receiving circuit -1,121. millimeter wave emits
Circuit -2,112. millimeter wave receiving circuit -2,21. local oscillator module, 22. microwave treatment modules, 23. power modules, at 24. signals
Module is managed, 211. temperature-compensatings, 212. amplifications, 213. high-pass filterings, 214. is balanced, and 215. filtering, 216. amplifications, 217.
Weighing apparatus, 218. temperature-compensatings, 219. low-pass filtering, 221. crystal oscillators, 222.PLL, 223.2 frequencys multiplication, 224. filtering, 225. couplings,
226. couplings, 231. power protections and observation circuit, 232.DC/DC circuits；
Fig. 5 is the microwave module Standard schematic diagram of ground millimeter wave transceiver；
Reference numeral：51. microwave module bias with data (M2.5 feed-through capacitors), 52. millimeter wave transceiving modules biasing with
State (M2.5 feed-through capacitors), 53. medium frequency receptions input (SMP interfaces), and 54.18.9/20.1GHz local oscillators export (SMP interfaces),
55.18.9/20.1GHz local oscillator output (SMP interfaces), 56. intermediate frequencies transmitting output (SMP interfaces), 57. intermediate frequencies transmitting output (SMP
Interface), 58.18.9/20.1GHz local oscillators export (SMP interfaces), and 59.18.9/20.1GHz local oscillators export (SMP interfaces), and 510.
Medium frequency reception inputs (SMP interfaces), the biasing of 511. millimeter wave transceiving modules and state (M2.5 feed-through capacitors), the input of 512. intermediate frequencies
Export Integrated Service Digital Network (SMP interfaces)；
Fig. 6 is ifd module schematic diagram；
Reference numeral：21. microwave treatment module, 31. transmission channels, 32. receiving channels, 311. is balanced, and 312. numerical controls decline
Subtract, 313. amplifications, 314. high-pass filterings, 315. temperature-compensatings decaying, 321. temperature-compensatings decaying, 322. filtering, 323. amplifications,
324. low-pass filtering, 325. couplings, 326. detections, 327.AGC, 328. is balanced, 329. amplifications；
Fig. 7 is the Standard figure of the millimeter wave transceiver in antenna house on bar.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the ground millimeter wave transceiver of the present invention, using modular mentality of designing, by millimeter wave transceiving
Module (including millimeter wave transceiving channel -1, millimeter wave transceiving channel -2), microwave module and ifd module composition.Millimeter wave transceiving
Local oscillation signal and medium-frequency receiving and sending signal in module needed for two sets of millimeter wave transceiving channel is identical, can be total in microwave module
With；Ifd module is identical as vehicle-mounted millimeter wave transceiver, can directly continue to use.Millimeter wave transceiving module, microwave module are the same as outer
Two ground-plane antennas, two circulators in portion are installed on jointly in the antenna house on contact net bar, ifd module and are installed on bar
Under base band cabinet in.
Millimeter wave transceiving module, including two sets of identical millimeter wave transceiving channels：Millimeter wave transmitting circuit -1, millimeter wave connect
Receive the millimeter wave transceiving channel -1 that circuit -1 forms and the millimeter wave that millimeter wave transmitting circuit -2, millimeter wave receiving circuit -2 form
Transceiver channel -2, schematic diagram is as shown in Figure 2.What millimeter wave transmitting circuit -1 or millimeter wave transmitting circuit -2 inputted microwave module
Intermediate-freuqncy signal (bandwidth 1GHz) up-conversion is sent into circulator to the millimeter wave frequency band to work after being amplified to required power, by ground
Car antenna of the surface antenna in roof of train is launched.Meanwhile ground-plane antenna receives the millimeter wave letter of car antenna transmitting
Number (bandwidth 1GHz) enters millimeter wave receiving circuit -1 or millimeter wave receiving circuit -2 after circulator, after signal is amplified under
It is converted to intermediate-freuqncy signal, output to microwave module.Two sets of millimeter wave transceiving channel time-sharing works of millimeter wave transceiving module, i.e., together
One moment only had the work of millimeter wave transceiving channel -1 or millimeter wave transceiving channel -2 works, the system channel inputted by microwave module
Switching signal controls channel selecting when millimeter wave transceiving module work.
The input signal of millimeter -2 pairs of local oscillator modules of wave transmitting circuit -1 or millimeter wave transmitting circuit is amplified and frequency multiplication
Afterwards as the local oscillation signal of millimeter wave mixer, amplifier is the chip of ADI, and working frequency is 13~25GHz, and gain is
20dB；Frequency multiplier is the chip of ADI, 32~46GHz of reference frequency output, output power 13dBm.It is inputted later with microwave module
Intermediate-freuqncy signal be mixed, generate required millimeter-wave signal；Frequency mixer be ADI chip, 25~40GHz of working frequency range,
Input 1dB compression points are 11dBm, conversion loss 9.5dB.The processing such as finally it is filtered, amplifies to millimeter-wave signal, it will milli
Metric wave signal is amplified to required power.Amplifier chain is by the way of three-level amplification：The small signal of first order amplifier processing, considers
To the versatility of circuit, using low-noise amplifier identical with millimeter wave receiving circuit, which is the chip of Ommic,
Working range is 25~43GHz, and noise coefficient is less than 1.8dB, gain 25dB；Second level amplifier drives rear class power amplifier work
Make, which is the chip of Avago, and the 1dB compression points of working range 20-45GHz, output power are 21dBm, and gain is
25dB,；Third stage power amplifier, the amplifier are the chip of Qorvo, working frequency range 33-47GHz, gain 25dB, output work
The 1dB compression points of rate are 26dBm；The mm wave RF signal of power amplifier output is filtered through probe transitions and waveguide cavity diaphragm
Device is sent into circulator.
Meanwhile ground-plane antenna receives the millimeter-wave signal (bandwidth 1GHz) of car antenna transmitting, and milli is entered after circulator
Metric wave receiving circuit -1 or millimeter wave receiving circuit -2.Through waveguide filter and probe transitions, improve in millimeter wave transceiving module
Transceiver insulation extracts millimeter-wave signal and forms matched well with circuit；It subsequently enters low-noise amplifier and improves millimeter wave letter
Number reception power, the amplifier in millimeter wave transmitting circuit amplify the link first order it is identical.Millimeter wave mixer is using humorous
The mode of wave mixing, to reduce the power consumption, volume and cost of circuit.Local oscillator module input signal filtering after with millimeter-wave signal
Into frequency mixer, which is the chip of ADI, and the isolation of output signal and local oscillation signal is more than 37dB, and conversion loss is
Millimeter-wave signal is down-converted to received IF signal by 10dB.
It is metal shielding box outside millimeter wave transceiving module, structure is as shown in figure 3, left side is millimeter wave transceiving channel-
1, right side be two sets millimeter wave transceiving channel -2, each millimeter wave transceiving channel two local oscillators input, intermediate frequency transmitting input and
The interface of medium frequency reception output is all made of SMP, and the SMP interfaces with symmetric position at left and right sides of shared microwave module are to inserting phase
Even；Millimeter wave transmitting circuit connect the waveguide filter of the left and right sides with millimeter wave receiving circuit by WR-28 standard waveguides, and
It is connected to circulator, overall structure is more small-sized, compact, maximally utilizes the volume of bar upper ground surface base station enclosure, is convenient for and ground
Surface antenna is integrated.The biasing of millimeter wave transceiving module/state input uses M2.5 feed-through capacitors, and it is logical to be biased to millimeter wave transceiving
Road -1 or millimeter wave transceiving channel -2 provide the direct current biasing needed for work, and state is switched by the system channel that microwave module is sent
Signal controls channel selecting when millimeter wave transceiving module work, and millimeter wave transceiving channel -1 works when high level, when low level
It is switched to the work of millimeter wave transceiving channel -2.
Microwave module can be that two sets of millimeter wave transceiving channels share, to reduce the quantity of equipment, volume and power consumption on bar.Iron
There are several ground stations, the microwave module on each website utmostly to share on curb line, lessens system Construction
Cost.As shown in figure 4, microwave module is by four microwave treatment module, local oscillator module, power module, signal processing module functions
Module forms, and realizes the processing to the intermediate frequency transmitting/receiving signal of ifd module input/output, transmission；For millimeter wave transceiving mould
Block provides local oscillation signal；Biasing is provided for each module of ground millimeter wave transceiver on bar；And to millimeter wave transceiver in bar
On each module working state monitoring and control etc. functions.
Microwave treatment module, including transmission channel and receiving channel, intermediate frequency transmitting signal carry out first in transmission channel
Temperature-compensating, amplification, amplifier are the chip of Mini-Circuits, operating frequency range 0.5-5GHz, noise coefficient
1.4dB, gain 21dB；After through high-pass filtering, and to it carry out equilibrium treatment to improve inband flatness, finally enter
SPDT controls it by system channel switching signal and removes millimeter wave transmitting circuit -1 or millimeter wave transmitting circuit -2；Meanwhile system
It is logical from millimeter wave receiving circuit -1 or millimeter wave receiving circuit -2 into receiving that channel switching signal controls received IF signal
Road, filtered in receiving channel, amplification, amplifier use the chip of Mini-Circuits identical with transmission channel, amplification
Post-equalization is to improve inband flatness, temperature compensated rear low-pass filtering output.It is micro- when system channel switching signal is high level
Wave processing module accesses millimeter wave transceiving channel -1 and works；Otherwise when being low level, it is switched to access millimeter wave transceiving channel -2
Work, to realize the channel selecting handoff functionality of system；The input of transmission channel and the output of receiving channel are using work(point
Mode shares a radiofrequency signal interface to reduce volume, and shared radiofrequency signal interface uses SMP.
Local oscillator module provides four road local oscillation signals for millimeter wave transceiving module, and two-way transmitting local oscillation signal goes millimeter wave to emit
Circuit -1 and millimeter wave transmitting circuit -2, two-way receive local oscillation signal and go millimeter wave receiving circuit -1 and millimeter wave receiving circuit -
2.By crystal oscillator give phaselocked loop provide reference signal, phaselocked loop use STMicw Electronics chip, working range 3.85-16GHz,
Highest phase demodulation frequency is 100MHz, has the function of fractional frequency division and integral frequency divisioil.After phase-locked loop locking, output 9.45/
The microwave signal of 10.05GHz is multiplied to 18.9/20.1GHz through varactor doubler, and varactor doubler uses the chip of ADI, output
Frequency range 13-24.6GHz, output power 17dBm；It is extracted through bandpass filter, then divides two-way to export signal through power splitter,
The transmitting local oscillator needed for millimeter wave transceiving channel is often covered finally by coupler coupling output and receive local oscillator per road output signal
Two paths of signals.In addition, the work(that local oscillator module has the output frequency for providing the instruction of local oscillator locking information and crystal oscillator tunable
Can, the realization of the functions such as calibration, fault pre-alarming and fault fast positioning when supporting system operation.
Power module includes power protection and observation circuit, DC/DC circuit two parts.Power protecting circuit is in power module
Input terminal, after external input voltage 12V passes through, anti-lightning strike, anti-can power on surge current, anti-overflow and reversal connection, monitoring electricity
The total working current indicating signal of each module of ground millimeter wave transceiver on bar is sent to signal processing module by road, is system
Run time fault early warning, monitoring and fault fast positioning provide intuitive foundation.The voltage of 12V is converted to milli by DC/DC circuits
Voltage+6V ,+5.2V ,+5V and -5V needed for metric wave transceiver module, microwave module and local oscillator module, respectively it is powered, and has
There is the function of power protection.
Signal processing module receives the temperature detection signal in two millimeter wave transceiving channels, local oscillator in millimeter wave transceiving module
The lock indication signal of module and the total working current indicating signal of power module, the working condition of each module on monitoring rod；To
Local oscillator module send crystal oscillator frequency tuning and to microwave treatment module send system channel switching signal, the calibration of control system and
Switching.Using the chip of ADI, which supports I2C agreements, is integrated with 4 road ADC and 4 road DAC, realizes the ground millimeter on bar
Under each module of wave transceiver and bar between the host of base band cabinet monitoring information data acquisition and transmission.
It is metal shielding box outside microwave module, inside is divided into upper and lower cavities shielding box, wherein transmission channel, receiving channel
It is in the same face with local oscillator module, signal processing module and power module are integrated on the PCB of another side cavity, Standard
Scheme as shown in figure 5, the interface of medium frequency reception input, two local oscillators inputs and intermediate frequency transmitting output is all made of SMP, positioned at microwave mode
The medianly zygomorphic position of block；With the metal shielding box in millimeter wave transceiving channel -1 and millimeter wave transceiving channel -2 to inserting phase
Even, the Integrated Service Digital Network interface that the input of transmission channel and the output of receiving channel share uses SMP；Microwave module is biased to be handed over data
M2.5 feed-through capacitors are mutually used, each module work shape of millimeter wave transceiver on 12V externally feds control source and roof is provided
Data input and output are monitored and controlled in state；Two millimeter wave transceiving module biasings use M2.5 feed-through capacitors, millimeter wave with state
Transceiver channel -1 and millimeter wave transceiving channel -2 provide the control signal of biasing and channel switching.
Ifd module is the part intermediate-frequency circuit that can be integrated with digital-to-analog circuits such as base band, modulation /demodulation, including transmission channel
And receiving channel, schematic diagram are as shown in Figure 6.One radio frequency is shared to the intermediate frequency transmitting/receiving signal of microwave module input/output
Signal SMA interfaces, the signaling interface to external digital-to-analog circuit are that intermediate frequency inputs and intermediate frequency exports two independent SMA interfaces, point
It is not connected with transmission channel and receiving channel.Power supply signal and monitoring signal are accessed from DB9 interfaces, it can be achieved that emitting signal work(
The functions such as rate control, received signal strength monitoring, AGC dynamic adjustment.
Transmission channel first to externally input intermediate frequency transmitting signal do it is balanced improve inband flatness, after through numerical control attenuation
Device controls its power by transmission power control signal, promotes environment adaptive capacity, and numerical-control attenuator is the core of ADI
Piece, insertion loss 1.7dB, it is possible to provide the attenuation of maximum 31dB.Again through amplification and high-pass filtering, and decayed by temperature-compensating
Device improves the influence of gain inconsistency under high/low temperature condition, is most exported afterwards through circulator.Amplifier use in microwave module
The chip of identical Mini-Circuits.
The received IF signal inputted from microwave module enters receiving channel after circulator, passes through temperature compensation attenuator
Improve high/low temperature condition under gain inconsistency influence, and it is filtered, amplify after extracted by low-pass filter
Received IF signal, and two paths of signals is exported by coupler：Signal demodulator exports all the way, and received signal strength is provided to system
Monitoring signals；Another way signal increases the dynamic range of receives link by way of AGC loop, and detection input terminal can receive
The AGC of system controls signal, is adjusted into Mobile state to AGC, and the signal of output end passes through balanced, amplification, last externally output
Received IF signal needed for back-end circuit.Amplifier uses the chip of the identical Mini-Circuits with microwave module.
Millimeter wave transceiving module and microwave module are positioned over circulator, antenna in the antenna house of bar upper ground surface base station,
Total power consumption is no more than 14W, as shown in Figure 7；Ifd module is installed in the base band cabinet under bar, in each modular structure
For metal shielding box, the anti-interference ability and dust tightness of circuit are improved, is convenient for the system integration.
Claims (4)
1. a kind of millimeter wave transceiver of rail vehicle ground wireless communication ground base station, which is characterized in that the millimeter wave is received
Hair machine includes millimeter wave transceiving module, microwave module and ifd module, wherein：
The millimeter wave transceiving module includes first be made of first millimeter of wave transmitting circuit and the first millimeter wave receiving circuit
Millimeter wave transceiving channel, the second millimeter wave transceiving being made of second millimeter of wave transmitting circuit and the second millimeter wave receiving circuit lead to
Road；The intermediate-freuqncy signal up-conversion that first millimeter of wave transmitting circuit or second millimeter of wave transmitting circuit are used to input microwave module is extremely
The millimeter wave frequency band of work, and it is sent into circulator after being amplified to required power, from vehicle-mounted day of the ground-plane antenna in roof of train
Line is launched；Meanwhile ground-plane antenna receives the millimeter-wave signal of car antenna transmitting, and the first millimeter wave is entered after circulator
Receiving circuit or the second millimeter wave receiving circuit downconvert to intermediate-freuqncy signal, output to microwave module after amplifying signal；Millimeter
Two sets of millimeter wave transceiving channel time-sharing works of wave transceiver module, i.e. synchronization only have the first millimeter wave transceiving channels operation or
Second millimeter wave transceiving channels operation；
The microwave module includes microwave treatment module, local oscillator module, power module and signal processing module；The microwave treatment
Module includes transmission channel and receiving channel, is respectively used to emit signal to the intermediate frequency from ifd module and removes ifd module
Received IF signal carries out temperature-compensating, amplification, filtering and equilibrium treatment；The local oscillator module is used to be millimeter wave transceiving module
Local oscillation signal needed for providing；The power module is used to external input voltage being converted to millimeter wave transceiving module, microwave mode
Voltage needed for block and local oscillator module and respectively its power supply；The signal processing module is for the monitoring to millimeter wave transceiver
Information is acquired and transmits, and the monitoring information is to weigh the physical index information of each module working condition；
The ifd module is part intermediate-frequency circuit that can be integrated with base band, modem, including intermediate frequency transmission channel is in
Frequency receiving channel；The intermediate frequency transmission channel, which is used to take place frequently in, to be penetrated signal progress equilibrium, amplifies and be filtered；Intermediate frequency simultaneously
Receiving channel into automatic growth control, filtering and enhanced processing, provides demodulator required intermediate frequency letter received IF signal
Number.
2. a kind of millimeter wave transceiver of rail vehicle ground wireless communication ground base station according to claim 1, special
Sign is that the millimeter wave transceiver is assemblied in the millimeter wave transceiving front end of ground base station along track, on a left side for contact net bar
Each a set of millimeter wave transceiving channel in right direction.
3. a kind of vehicle-mounted millimeter wave transceiver of rail vehicle ground wireless communication according to claim 1 or 2, feature
It is, the monitoring information includes at least the temperature information of millimeter wave transceiving module and the total working electric current instruction letter of power module
Breath.
4. a kind of vehicle-mounted millimeter wave transceiver of rail vehicle ground wireless communication according to claim 3, feature exist
In the millimeter-wave signal interface of the millimeter wave transceiver uses WR-28 standard waveguides, and local oscillation signal and intermediate-freuqncy signal interface are adopted
Use coaxial connector.
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Cited By (1)
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| CN109586765A (en) * | 2019-01-25 | 2019-04-05 | 福州瑞品电子科技有限公司 | A kind of electric railway communication equipment and system based on millimeter wave |
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| CN108667481B (en) | 2023-09-19 |
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