CN110504985A - A kind of train dispatch radio communication channel machine equipment and implementation method with digitized audio interface - Google Patents
A kind of train dispatch radio communication channel machine equipment and implementation method with digitized audio interface Download PDFInfo
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- CN110504985A CN110504985A CN201910905282.2A CN201910905282A CN110504985A CN 110504985 A CN110504985 A CN 110504985A CN 201910905282 A CN201910905282 A CN 201910905282A CN 110504985 A CN110504985 A CN 110504985A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 title claims abstract description 17
- 230000011664 signaling Effects 0.000 claims abstract description 39
- 239000010453 quartz Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000003032 molecular docking Methods 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 2
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- MHRLWUPLSHYLOK-UHFFFAOYSA-N thiomorpholine-3,5-dicarboxylic acid Chemical compound OC(=O)C1CSCC(C(O)=O)N1 MHRLWUPLSHYLOK-UHFFFAOYSA-N 0.000 abstract description 4
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Classifications
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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
- H04B1/44—Transmit/receive switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
-
- 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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of train dispatch radio communication channel machine equipments and implementation method with digitized audio interface.The equipment includes antennal interface, transmit-receive switch, receiving unit, transmitting unit, power supply unit, control circuit, control interface, PTT control hair interface and power interface, the 4FSK digital channel of hardware compatibility FM analog channel and TMDA multi-access mode, audio interface, signaling interface, control interface are unified for signaling interface by 1 SPI interface, SPI interface is synchronous digital interface, digitized audio interface avoids the influence of TDMA noise, to solve the problems, such as TDMA noise to audio disturbances, while the merging of interface function simplifies interface connection.
Description
Technical field
The present invention relates to railroad train wireless dispatching communication technologies, and in particular to a kind of with the wireless of digitized audio interface
Column adjust channel machine equipment and implementation method.
Background technique
Train dispatch radio communication channel machine equipment is the important equipment in railway wireless train scheduling system, generally by antennal interface,
Circuit, transmit circuit, control circuit, subsonics signaling interface, audio interface, control interface, power interface, PTT control hair is received to connect
The composition such as mouth.With the development of science and technology, railway wireless train dispatching communication is required from simulation-to-digital transition, original analog channel
National standard and industry requirement are had been unable to meet, and digital channel is divided into FDMA(frequency division multiple access) mode (such as dPMR, NXDN
Deng) and TDMA(time division multiple acess) mode (such as DMR, PDT).Sound between current train dispatch radio communication channel device and controlling equipment
Frequency interface uses analog signaling, and which is easy the interference by TDMA noise to reduce audio quality.TDMA noise
Production principle: TMDA(time division multiple acess is used) digit wireless communication system of multi-access mode is based on 2 time slot TMDA structure, i.e.,
30ms emits 30ms and receives alternately lasting carry out.So that RF power amplification transmission envelop is the square wave of 30ms, change frequency is
33.33Hz.The frequency and its harmonic wave are easy to interfere with analog audio circuit, to reduce audio quality.
In addition, it is existing and once some be applied to railroad train wireless dispatching communication channel machine equipment, audio interface (simulation
Audio interface), infrasonic signaling interface (simulation infrasonic interface), control interface (uart digital interface) be three and independent connect
Mouthful, cause interface connection complicated.
Summary of the invention
In view of the problems existing in the prior art and defect, the purpose of the present invention is to provide a kind of band digitized audio interfaces
Train dispatch radio communication channel machine equipment and implementation method, to solve the problems, such as to propose in the prior art.
The technical solution adopted by the present invention is that: a kind of train dispatch radio communication channel machine equipment with digitized audio interface, including
Antennal interface, transmit-receive switch, receiving unit, transmitting unit, power supply unit, control circuit, control interface, PTT control hair interface and
Power interface, which is characterized in that audio interface, signaling interface, control interface are passed through a SPI interface by the control interface
It is uniformly set as signaling interface, the control circuit uses model OMAPL138 main control chip；Receiving unit uses low noise
Amplifier, frequency mixer, crystal filter, IF amplifier circuit and model AD9864 if digitization circuit；Transmitting unit is adopted
With power amplifier, driving amplifier, model LMX2571 frequency synthesizer and model TCXO temperature compensating type quartz crystal
Oscillator；Power supply unit is using model 78M05 voltage-stablizer, model L7808 voltage-stablizer, model SPX3819M5-3.3 electricity
Source chip, model LTC3607 voltage-stablizer and model L78M08 voltage-stablizer.
The antennal interface is bi-directionally connected transmit-receive switch, and the OMAPL138 main control chip connects transmit-receive switch, described to connect
Low noise amplifier, frequency mixer, crystal filter, IF amplifier circuit, the if digitization circuit for receiving unit are sequentially connected,
Middle low noise amplifier connects transmit-receive switch, while connecting again with IF amplifier circuit, if digitization circuit connection master control core
Piece；Power amplifier, driving amplifier, frequency synthesizer and the temperature compensating type quartz oscillator of the transmitting unit according to
Secondary connection, intermediate power amplifier connects transmit-receive switch, while frequency synthesizer is connected to frequency mixer and the master of receiving unit
Control chip；The 78M05 voltage-stablizer of the power supply unit is connected to the low noise amplifier and IF amplifier circuit of receiving unit,
L7808 voltage-stablizer is separately connected the driving amplifier of 78M05 voltage-stablizer and transmitting unit, and it is single that power supply chip is respectively connected to transmitting
The if digitization circuit of the frequency synthesizer of member, temperature compensating type quartz oscillator and receiving unit, while power supply core
Piece connects main control chip again, and LTC3607 voltage-stablizer connects power supply chip, while connecting main control chip again, and L78M08 voltage-stablizer connects
Connect LTC3607 voltage-stablizer；The signaling interface and PTT control hair interface are separately connected main control chip；Power interface connects power supply
The L78M08 voltage-stablizer of unit.
A kind of implementation method of train dispatch radio communication channel machine equipment, which is characterized in that the nothing with digitized audio interface
Alignment tune channel machine equipment executes following operation: receiving unit circuit initializes first, SPI interface initialization；Transmit-receive switch is cut
Change to receiving unit；SPI interface controls packet parsing processing, subsequently into reception stand-by state；Controlling hair interface level to PTT is
It is no it is low judged, if so, transmit-receive switch is switched to transmitting unit, into emission state process；Next PTT control hair is connect
Mouthful whether level is high is judged, if it is, programming jump, which is back to transmit-receive switch, is switched to receiving unit step, if not
It is that then program backs into emission state process；If sent out PTT control, whether interface level is low to be judged as not low, next
Whether to receiving wireless signal and judging, if it is determined that not receiving wireless signal, then programming jump is back to reception and keeps
Wait state step；If receiving wireless signal, program enters reception state process, if it is determined that wireless signal terminates, journey
Sequence, which jumps, is back to SPI interface control packet parsing processing step, if it is determined that wireless signal is not finished, program, which backs into, to be connect
Receipts state process.
Reception state process of the present invention is: demodulating to signal is received, docking is received digitized audio frequency signaling and carried out
Digitized audio, signaling composition are received signal frame by parsing, and control SPI interface output receives signal frame to signaling interface；It is described
Emission state process is: control SPI interface inputs transmitting signal frame from signaling interface, and dismantling transmitting signal frame is digitlization sound
Frequently, signaling converts digitized audio, signaling as modulated signal, with modulated signal modulate emission radiofrequency signal, it is defeated to emit signal
Out.
The invention has the advantages that: the 4FSK of hardware compatibility FM analog channel and TMDA multi-access mode number
Channel, audio interface, signaling interface, control interface are unified for signaling interface by 1 SPI interface, and SPI interface is synchronous digital
Interface, digitized audio interface avoid the influence of TDMA noise, thus solve the problems, such as TDMA noise to audio disturbances, together
When interface function merging simplify interface connection.
Detailed description of the invention
Fig. 1 is circuit connection functional block diagram of the present invention；
Fig. 2 is overview flow chart of the present invention；
Fig. 3 is reception state flow chart in Fig. 2；
Fig. 4 is emission state flow chart in Fig. 2.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
As shown in Figure 1, the design includes antennal interface, transmit-receive switch, receiving unit, transmitting unit, power supply unit, control
Circuit, signaling interface, PTT control hair interface and power interface, signaling interface therein connect audio interface, signaling interface, control
Mouth is unified for an interface by a SPI interface, and control circuit uses model OMAPL138 main control chip；Receiving unit is adopted
With low noise amplifier, frequency mixer, crystal filter, IF amplifier circuit and model AD9864 if digitization circuit；Hair
Unit is penetrated using power amplifier, driving amplifier, model LMX2571 frequency synthesizer and model TCXO temperature compensating type
Quartz oscillator；Power supply unit uses model 78M05 voltage-stablizer, model L7808 voltage-stablizer, model
SPX3819M5-3.3 power supply chip, model LTC3607 voltage-stablizer and model L78M08 voltage-stablizer.
Antennal interface is bi-directionally connected transmit-receive switch, and OMAPL138 main control chip connects transmit-receive switch, the low noise of receiving unit
Sound amplifier, frequency mixer, crystal filter, IF amplifier circuit, if digitization circuit are sequentially connected, and wherein low noise amplifies
Device connects transmit-receive switch, while connecting again with IF amplifier circuit, if digitization circuit connection main control chip；Transmitting unit
Power amplifier, driving amplifier, frequency synthesizer and temperature compensating type quartz oscillator are sequentially connected, and wherein power is put
Big device connects transmit-receive switch, while frequency synthesizer is connected to the frequency mixer and main control chip of receiving unit；Power supply unit
78M05 voltage-stablizer is connected to the low noise amplifier and IF amplifier circuit of receiving unit, and L7808 voltage-stablizer is separately connected
The driving amplifier of 78M05 voltage-stablizer and transmitting unit, power supply chip are respectively connected to the frequency synthesizer of transmitting unit, temperature
The if digitization circuit of offset-type quartz oscillator and receiving unit, while power supply chip connects main control chip again,
LTC3607 voltage-stablizer connects power supply chip, while connecting main control chip again, and L78M08 voltage-stablizer connects LTC3607 voltage-stablizer；Institute
Signaling interface and PTT the control hair interface stated are separately connected main control chip；The L78M08 voltage-stablizer of power interface connection power supply unit.
+ 13.8VDC the power supply that power supply unit inputs power interface carries out level conversion, realizes after conversion to master control
Each circuit in chip OMAPL138, receiving unit and each circuit in transmitting unit are powered.
As shown in Fig. 2, the train dispatch radio communication channel machine equipment of the invention with digitized audio interface executes following operation: first
First receiving unit circuit initialization, SPI interface initialization；Transmit-receive switch is switched to receiving unit；SPI interface controls packet parsing
Processing, subsequently into reception stand-by state；To PTT control hair, whether interface level is low judges, if so, transmit-receive switch switches
To transmitting unit, into emission state process；Next to PTT control hair, whether interface level is high judges, if it is, journey
Sequence, which jumps, to be back to transmit-receive switch and is switched to receiving unit step, if it is not, then program backs into emission state process；Such as
Whether interface level low is judged as not low to PTT control hair for fruit, then next to whether receiving wireless signal and judge, if
Judgement does not receive wireless signal, then programming jump, which is back to, receives stand-by state step；If receiving wireless signal, journey
Sequence enters reception state process, if it is determined that wireless signal terminates, programming jump is back to SPI interface control packet parsing processing
Step, if it is determined that wireless signal is not finished, program backs into reception state process.
As shown in Figure 3, Figure 4, reception state process is: demodulating to signal is received, digitized audio frequency signaling is received in docking
It is parsed, digitized audio, signaling composition is received into signal frame, control SPI interface output receives signal frame to signaling interface；
The emission state process is: control SPI interface inputs transmitting signal frame from signaling interface, and dismantling transmitting signal frame is digitlization
Audio, signaling convert digitized audio, signaling as modulated signal, with modulated signal modulate emission radiofrequency signal, it is defeated to emit signal
Out.
The equipment has two kinds of reception state, transmitting working conditions, and working principle is as follows:
Reception state: radio frequency receiving signal enters low-noise amplifier by transmit-receive switch by antennal interface, puts through low noise
Big device is amplified into frequency mixer.Frequency synthesizer (LMX2571) output local oscillation signal enters frequency mixer and radio frequency receiving signal
It is mixed, obtains intermediate-freuqncy signal after frequency mixer output mixing, intermediate-freuqncy signal enters crystal filter, amplifies subsequently into intermediate frequency
Circuit after if digitization circuit carries out if digitization processing, enters subsequently into if digitization circuit (AD9864)
To FM or 4FSK demodulation is carried out in main control chip (OMAPL138), the digitized audio, signaling after demodulation are exported by SPI interface
To signaling interface.
Emission state: external interface PTT control hair interface input low level enters equipment to main control chip (OMAPL138)
Emission state.Signal comprising information such as digitized audio, signaling and controls is input to main control chip by SPI interface, through master
Output modulated signal is exported to frequency synthesizer (LMX2571) progress FM or 4FSK modulation, frequency synthesizer after controlling chip processing
Modulated radio frequency transmissions are to driving amplifier, subsequently into power amplifier, then are output to antenna through transmit-receive switch and connect
Mouthful.
Claims (3)
1. a kind of train dispatch radio communication channel machine equipment with digitized audio interface, including antennal interface, transmit-receive switch, reception list
Member, transmitting unit, power supply unit, control circuit, signaling interface, PTT control hair interface and power interface, which is characterized in that described
Signaling interface audio interface, signaling interface, control interface are unified for an interface, the control by a SPI interface
Circuit processed uses model OMAPL138 main control chip；Receiving unit using low noise amplifier, frequency mixer, crystal filter,
IF amplifier circuit and model AD9864 if digitization circuit；Transmitting unit uses power amplifier, driving amplifier, type
Number be LMX2571 frequency synthesizer and model TCXO temperature compensating type quartz oscillator；Power supply unit uses model
78M05 voltage-stablizer, model L7808 voltage-stablizer, model SPX3819M5-3.3 power supply chip, model LTC3607 voltage-stablizer
With model L78M08 voltage-stablizer；
The antennal interface is bi-directionally connected transmit-receive switch, and the OMAPL138 main control chip connects transmit-receive switch, and the reception is single
Low noise amplifier, frequency mixer, crystal filter, IF amplifier circuit, the if digitization circuit of member are sequentially connected, wherein low
Noise Amplifier connects transmit-receive switch, while connecting again with IF amplifier circuit, if digitization circuit connection main control chip；Institute
Power amplifier, driving amplifier, frequency synthesizer and the temperature compensating type quartz oscillator for stating transmitting unit successively connect
It connects, intermediate power amplifier connects transmit-receive switch, while frequency synthesizer is connected to the frequency mixer and master control core of receiving unit
Piece；The 78M05 voltage-stablizer of the power supply unit is connected to the low noise amplifier and IF amplifier circuit of receiving unit, L7808
Voltage-stablizer is separately connected the driving amplifier of 78M05 voltage-stablizer and transmitting unit, and power supply chip is respectively connected to transmitting unit
The if digitization circuit of frequency synthesizer, temperature compensating type quartz oscillator and receiving unit, while power supply chip is again
Main control chip is connected, LTC3607 voltage-stablizer connects power supply chip, while connecting main control chip again, the connection of L78M08 voltage-stablizer
LTC3607 voltage-stablizer；The signaling interface and PTT control hair interface are separately connected main control chip；Power interface connects power supply list
The L78M08 voltage-stablizer of member.
2. a kind of implementation method of the train dispatch radio communication channel machine equipment with digitized audio interface as described in claim 1,
It is characterized in that, the train dispatch radio communication channel machine equipment with digitized audio interface executes following operation: receiving unit electricity first
Road initialization, SPI interface initialization；Transmit-receive switch is switched to receiving unit；SPI interface control packet parsing processing, then into
Enter to receive stand-by state；To PTT control hair, whether interface level is low judges, if so, transmit-receive switch is switched to transmitting unit,
Into emission state process；Next to PTT control hair, whether interface level is high judges, if it is, programming jump returns
It is switched to receiving unit step to transmit-receive switch, if it is not, then program backs into emission state process；If controlled to PTT
Whether whether interface level is low is judged as not low for hair, then next to receiving wireless signal and judging, if it is determined that not connecing
Wireless signal is received, then programming jump, which is back to, receives stand-by state step；If receiving wireless signal, program, which enters, to be connect
Receipts state process, if it is determined that wireless signal terminates, programming jump is back to SPI interface control packet parsing processing step, such as
Fruit judges that wireless signal is not finished, and program backs into reception state process.
3. the implementation method of the train dispatch radio communication channel machine equipment according to claim 2 with digitized audio interface, special
Sign is that the reception state process is: demodulating to signal is received, docking is received digitized audio frequency signaling and parsed, will
Digitized audio, signaling composition receive signal frame, and control SPI interface output receives signal frame to signaling interface；The emitting shape
State process is: control SPI interface from signaling interface input transmitting signal frame, dismantling transmitting signal frame be digitized audio, signaling,
Digitized audio, signaling are converted as modulated signal, with modulated signal modulate emission radiofrequency signal, emits signal output.
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Cited By (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116366087A (en) * | 2023-05-30 | 2023-06-30 | 天津七一二移动通信有限公司 | Station antenna feeder system of railway train shunting station and implementation method |
| CN116366087B (en) * | 2023-05-30 | 2023-10-27 | 天津七一二移动通信有限公司 | Station antenna feeder system of railway train shunting station and implementation method |
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