CN104022833B - It is a kind of using rail as track traffic ground communication transmission medium communication means - Google Patents
It is a kind of using rail as track traffic ground communication transmission medium communication means Download PDFInfo
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- CN104022833B CN104022833B CN201310061193.7A CN201310061193A CN104022833B CN 104022833 B CN104022833 B CN 104022833B CN 201310061193 A CN201310061193 A CN 201310061193A CN 104022833 B CN104022833 B CN 104022833B
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Abstract
The present invention relates to it is a kind of using rail as track traffic ground communication transmission medium communication means, it is characterised in that：This method regard the mechanical wave propagated in rail as digital communication medium.Described device includes：For encouraging the specially PZT (piezoelectric transducer) device of mechanical wave, controlling antitransmitter receiver, power amplifier device, the embedded computer with High Speed Analog amount input/output function of transmission/reception.Patent of the present invention can be directed to different temperatures, humidity and rail type, and Automatic-searching simultaneously selects, using the mechanical wave frequency rate for being best suitable for conduction, possess preferable antijamming capability, can realize more communication at a distance.This technology may be used on using rail as in the rail vehicle transportation system of basic transportation media, make it that extra trackside communication equipment need not be installed and realize long haul communication function in itself using rail, it has foreseeable huge economic value and social value.
Description
Technical field：
The present invention relates to the track traffic communications field, it is proposed that a kind of transmit rail as track traffic ground communication is situated between
The communication means of matter.
Background technology：
In field of track traffic, ground communication technology is to maintain running scheduling, ensure the basic equipment of train traffic safety.
The ground communication transmission medium that current track field of traffic is mainly used includes optical fiber, cable, radio communication etc..Wherein channel radio
Believe in the complicated area of electromagnetic environment easily by various electromagnetic interference influences, using limited in tunnel；The trackside line such as optical fiber, cable
Cable arrives thousands of kilometers because rail line generally reaches hundreds of, therefore laying cost is higher, and some cables are embedded in ground for a long time
Under, corroded unavoidably by various, maintenance difficulties are big.Cable, optical cable and radio communication base station can be set up by not laid rail
In the case of, realize track traffic ground telecommunication function by be railway communication technology breakthrough.
The content of the invention：
Present disclosure be propose it is a kind of using rail as track traffic ground communication transmission medium communication means.Should
Method is made up of several trackside communication nodes for being separated by 2 kms or so.Each node is by one group of communication controler, power amplification
Device and connection are coupled in the PZT (piezoelectric transducer) composition on every one steel rail.Binary data packets pass through a simple automatic wide frequency domain
Optimal frequency search protocol is transmitted with acoustic conductance waveshape by rail.Constantly relayed by increasing number of nodes, forward number
According to bag, remote track traffic terrestrial data transmission function is realized in the case where not needing mounting rail bypass communication cable.
Communication, which sends terminal, will need the binary data packets of transmission to be converted into specific frequency by D/A converter module
Oscillation pulse signal, drives the PZT (piezoelectric transducer) being installed on rail to launch mechanical wave letter into rail after power amplification circuit
Number, using the composite wave-shape of its generation, constantly reflection along its length is conducted in rail, separated by a distance another
Individual node is received by PZT (piezoelectric transducer), and vibration signal is converted to after electric signal, is reduced through signal transacting and analog-to-digital conversion parsing
Into serial binary data packets, communication function is realized.
Because the sleeper pad and sleeper of rail bottom are flexible, generally in vibration research as spring-damping element at
Reason, the spring-damping element amplitude very little in dither so that the amplitude of sleeper pad and sleeper also very little, to two rail
Vibration coupling effect is not strong, therefore two one steel rails are two separate redundancy solid mechanical ripple propagation mediums.
Fixed form of the PZT (piezoelectric transducer) on rail is that circular ultrasonic transducer probe first is fixed on into 5 centimetres of the length of side
Aspect, on wedge-shaped aluminum base, pedestal is then affixed on steel rail web side with entrant sound Wear Characteristics of Epoxy Adhesive, and at edge using welding
The mode connect is fixed.Weld seam residue should polish flat, and make it not influence the related gauge of train operation to require.
Brief description of the drawings：
Below in conjunction with the accompanying drawings and implementation the present invention is further detailed explanation：
Fig. 1 be using rail as track traffic ground communication transmission medium communication apparatus structure schematic diagram.
Embodiment：
The implication of each number designation in accompanying drawing is as follows：
PZT (piezoelectric transducer) device 1, wedge type transducer fixed pedestal 2, rail 3, transmission/receiving converter 4, power amplification
Device 5, serial pulses generator 6, signal transacting and A/D converter 7, communication terminal device 8, guided Waves 9.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment
As shown in Figure 1 for it is a kind of using rail as track traffic ground communication transmission medium communicator.It is by inciting somebody to action
Communication data packet is converted to serial acoustic conductance wave impulse, is received and parsed through after rail direction propagation and is reduced into binary data packets reality
Existing data communication function.The device for being used to encouraging and receiving mechanical wave used in it is PZT (piezoelectric transducer).
The communication means is queried with adjusting these three processes comprising initial broad frequency domain frequency search, data transmission, frequency.
Before communication is initially set up, it is host node that a node is defined first, that is this node initiates communication, separately
One adjacent node is from node.Using Fig. 1 as example, if definition left side device be host node, then in Fig. 1 the right device be from
Node.Each of which independent operating during beginning, that is to say, that they are not prior synchronous.
When communication is initially set up, host node first sends 5 seconds slow frequency sweep mechanical waves in the range of certain frequency, then monitors 5
Second.This process is circulated always, until receiving the feedback information from node.
The composite wave-shape that the mechanical wave that host node is sent is produced is propagated along its length in rail, because rail is used as ripple
Decay and degree of filtration of the conduit to the mechanical wave of different frequency are not quite similar, thus what is received from node are different a string
The Scanning Frequency Vibration Signals of peak value and frequency, and can be repeated once for every 10 seconds.
From 10 seconds signals of nodes records, to ensure the partial data for obtaining a host node frequency sweep.Then, it is logical from node
These data search crest frequencies are crossed, amplitude maximum is found to the signal recorded, then the sub-fraction to data is carried out
FFT is calculated to determine frequency, i.e., find the current mechanical wave frequency rate for being best suitable for propagating in rail by frequency sweep method.Generally in nothing
The mechanical wave signals peak value that the specific frequency received after 2 kms is propagated in seam rail exceedes more than twice of noise, therefore looks for
It is feasible to suitable crest frequency.When communication is initially set up, this host node frequency sweep, the mistake from nodes records and search
Journey will be repeated constantly, until finding same optimal frequency in several record periods from node.Can so avoid due to
The system noise that host node signal is included causes the influence of mistake to result.
From node after crest frequency (optimal frequency) is found, switch mode passes the frequency mechanical ripple searched
Give host node.The pulsewidth 1 second of transmission 5 from node to host node, frequency is the buzzing acoustical signal of crest frequency.This string buzzing letter
It is complete number to be that enough host nodes receive at least one sent from node within the long window silence period of 5 seconds for monitoring
Pulse width signal.Then the record that host node was intercepted to the silence of whole 5 seconds carries out FIR filtering, finds pulsewidth and believes for the buzzing of 1 second
Number.Once host node detects the pulsewidth buzzerphone of 1 second, it is meant that two nodes are aware of optimum traffic frequency.Under
One step is exactly that host node notifies to stop sending buzzerphone, i.e. host node from node that to continuously transmit 20 seconds pulsewidths optimal for 1 second
Frequency buzzerphone, makes at least to receive once the buzzerphone in reception window time from node.Filtered from node by FIR
Ripple device handles the signal, when from nodal test to after continuing the optimal frequency host node buzzing of 1 second, stopping is sent from buzzing.Extremely
This, two ends have both known about optimal frequency.Monitored 20 seconds after host node sends main buzzing in 20 seconds.If do not received in 20 seconds
From buzzing, then host node, which just can confirm that from node, have received confirmation answer, you can be transferred to data transfer state.
Communication between data transfer phase, node will be made up of binary data packets, and host node enters serial two
Data processed are converted to the pulse sound mechanical wave signals of optimal frequency, a length of bit base during fixing, and send optimal frequency machinery
Wave impulse represents numerical value " 1 ", and registration value " 0 " is not delivered.From node in the mechanical wave pulse decoding that will be received for packet
Signal intensity is calculated simultaneously.Then feedback acknowledgment signal is sent from node to host node, " information has been received by ", feedback content is informed
To send optimal frequency pulse sound 1 bit of mechanical wave signals to host node.
When environment temperature, humidity change, the mechanical wave frequency rate for being best suitable for propagating in rail can also change,
Thus system is required to adapt to environment temperature, the change of humidity automatically.When the former optimal frequency mechanical wave arteries and veins received from node
When rushing signal peak and being decreased obviously, from node by the way that feedback acknowledgment signal plus or minus half to several hertz are pointed out
The drift of optimal frequency.Profit can make effectively to produce query to the crest frequency that host node is sent from node in this way.
Host node will determine new optimal mechanical wave conductive frequency when receiving from the frequency query of node again by frequency sweep flow, real
Existing frequency trim.
The repeater being made up of PZT (piezoelectric transducer) and power amplifier can be installed at the mechanical insulated joint two ends of rail,
Realize relay forwarding function.The thermetic weld of usual gapless rail will also result in the excess-attenuation of guided Waves signal, according to difference
Line condition can suitably increase the quantity of repeater, to improve laser propagation effect.
Claims (6)
1. it is a kind of using rail (3) as track traffic ground communication transmission medium communication means, it is characterised in that：This method will
The mechanical wave propagated in rail (3) realizes the Serial Communication Function of binary data packets as digital communication medium；This technology
It may be used on using rail logical as in the rail vehicle transportation system of basic transportation media, making it to install extra trackside
Letter equipment realizes long haul communication function using rail in itself, is also applied for the conductor using other suitable mechanical wave propagations
Itself realizes communication function；
Its other key step includes：
1) when communication is initially set up, host node first sends 5 seconds slow frequency sweep mechanical waves in the range of certain frequency, then monitors 5 seconds,
This process is circulated always, until receiving the feedback information from node；
2) from 10 seconds signals of nodes records, to ensure the partial data for obtaining a host node frequency sweep, then this is passed through from node
A little data search crest frequencies, amplitude maximum is found to the signal recorded, and to the sub-fraction number near the maximum
Calculated according to FFT is carried out to determine optimal frequency, the current machine for being best suitable for propagating in rail can be found by this frequency sweep method
Tool wave frequency rate；When communication is initially set up, this host node frequency sweep, will constantly it repeat from nodes records and the process of search, directly
To same optimal frequency is found in several record periods from node, it can so avoid what is included due to host node signal
System noise causes the influence of mistake to result；
3) from node after crest frequency is found, by switch mode, the frequency mechanical ripple searched is sent to host node；From
Node is the buzzing acoustical signal of crest frequency to the host node pulsewidth 1 second of transmission 5, frequency, and this string buzzerphone is section main enough
Point receives at least one the complete pulse width signal sent from node within the long window silence period of 5 seconds for monitoring；So
The record that host node was intercepted to the silence of whole 5 seconds afterwards carries out FIR filtering, finds the buzzerphone that pulsewidth is 1 second, once main section
Point detects the pulsewidth buzzerphone of 1 second, it is meant that two nodes are aware of optimum traffic frequency；
4) next step is exactly that host node notifies that it is 1 to stop sending buzzerphone, i.e. host node to continuously transmit 20 seconds pulsewidths from node
The optimal frequency buzzerphone of second, makes at least to receive once the buzzerphone in reception window time from node；From node
The signal is handled by FIR filter, when from nodal test to after continuing the optimal frequency host node buzzing of 1 second, stops transmission
From buzzing, so far, two ends have both known about optimal frequency；Monitored 20 seconds after host node sends main buzzing in 20 seconds, if do not existed
Received in 20 seconds from buzzing, then host node, which just can confirm that from node, have received confirmation answer, you can be transferred to data transfer state；
5) communication between data transfer phase, node will be made up of binary data packets, and host node is by serial binary
Data are converted to the pulse sound mechanical wave signals of optimal frequency, a length of bit base during fixing, and send optimal frequency mechanical wave
Pulse represents numerical value " 1 ", and registration value " 0 " is not delivered；It is same for packet in the mechanical wave pulse decoding that will be received from node
When calculate
Signal intensity, then from node to host node send feedback acknowledgment signal, inform " information has been received by ", feedback content be to
Host node sends the signal of 1 bit of pulse sound mechanical wave of optimal frequency；
6) when environment temperature, humidity change, the mechanical wave frequency rate for being best suitable for propagating in rail can also change, because
And system is required to adapt to environment temperature, the change of humidity automatically；When the mechanical wave impulse of the former optimal frequency received from node
When signal peak is decreased obviously, from node by the way that feedback acknowledgment signal plus or minus half to some hertz are pointed out into optimal
The drift of frequency；Profit can make effectively to produce query to the crest frequency that host node is sent from node in this way；Main section
Point will determine new optimal mechanical wave conductive frequency again by frequency sweep flow when receiving from the frequency query of node, realize frequency
Rate is finely tuned.
2. according to claim 1 using rail (3) as track traffic ground communication transmission medium communication means, its
It is characterised by, the system includes：PZT (piezoelectric transducer) device (1), wedge type transducer fixed pedestal (2), transmission/reception converting means
Put (4), power amplifier (5), serial pulses generator (6), signal transacting and A/D converter (7), communication terminal device (8).
3. according to claim 2 using rail (3) as track traffic ground communication transmission medium communication means, its
It is characterised by, the specially described PZT (piezoelectric transducer) device for encouraging and receiving mechanical wave, but entering with material technology
Step and development, can also use other more excellent transducer apparatus.
4. according to claim 1 using rail (3) as track traffic ground communication transmission medium communication means, its
It is characterised by, can be directed to different temperatures, humidity and rail type, Automatic-searching is simultaneously selected using the mechanical wave for being best suitable for conduction
Frequency, possesses antijamming capability, can realize more communication at a distance.
5. according to claim 1 using rail (3) as track traffic ground communication transmission medium communication means, its
It is characterised by, two one steel rails can be mutually redundant as separate mechanical wave propagation medium, is damaged when there is certain one steel rail
When, mechanical wave can be conducted by an other one steel rail.
6. according to claim 1 using rail (3) as track traffic ground communication transmission medium communication means, its
It is characterised by, the direction of propagation of mechanical wave on the contrary, to realize bi-directional communication function simultaneously in two one steel rails of setting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310061193.7A CN104022833B (en) | 2013-03-01 | 2013-03-01 | It is a kind of using rail as track traffic ground communication transmission medium communication means |
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| CN201310061193.7A CN104022833B (en) | 2013-03-01 | 2013-03-01 | It is a kind of using rail as track traffic ground communication transmission medium communication means |
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| CN104022833B true CN104022833B (en) | 2017-11-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110377073B (en) * | 2019-07-17 | 2021-03-30 | 珠海格力电器股份有限公司 | Temperature controller control system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1385283A1 (en) * | 2002-07-22 | 2004-01-28 | Culture Com. Technology (Macau) Ltd. | Method of communication through a medium |
| CN101834675A (en) * | 2010-04-29 | 2010-09-15 | 四川大学 | A method for acoustic communication between underground and ground during underground rescue |
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2013
- 2013-03-01 CN CN201310061193.7A patent/CN104022833B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1385283A1 (en) * | 2002-07-22 | 2004-01-28 | Culture Com. Technology (Macau) Ltd. | Method of communication through a medium |
| CN101834675A (en) * | 2010-04-29 | 2010-09-15 | 四川大学 | A method for acoustic communication between underground and ground during underground rescue |
Non-Patent Citations (1)
| Title |
|---|
| An ultrasonic through-wall communication system with power harvesting;D.A.Shoudy,G.J.Saulnier,;《IEEE》;20071031;参见1848页-1853页 正文第一行-最后一行 * |
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