CN106585667A - System and method for detecting faults of vehicle-mounted beacon antenna - Google Patents
System and method for detecting faults of vehicle-mounted beacon antenna Download PDFInfo
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- CN106585667A CN106585667A CN201611170113.1A CN201611170113A CN106585667A CN 106585667 A CN106585667 A CN 106585667A CN 201611170113 A CN201611170113 A CN 201611170113A CN 106585667 A CN106585667 A CN 106585667A
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- vehicle
- antenna
- beacon
- ground
- signal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning, or like safety means along the route or between vehicles or vehicle trains
Abstract
The invention provides a system and method for detecting faults of a vehicle-mounted beacon antenna. According to the system and the method disclosed by the invention, a passive detection technique is adopted, a corresponding detecting system is arranged in a special railway region (without influencing an operation circuit, such as a railway region in front of a warehouse where materials are sent out), and is used for detecting the transmit power of the beacon antenna so as to determine the working condition of the beacon antenna. Further, according to the system and the method disclosed by the invention, an improved detection triggering and recording mechanism, a signal detection mechanism and a transmit power level judging manner are adopted, so that detection interference can be reduced, and the reliability, the accuracy and the detection efficiency can be improved.
Description
Technical field
The present invention relates to the CBTC of track traffic（Communication Based Train Control System, base
In the train automatic controlling system of communication）Technology, more particularly to a kind of system and side for vehicle-mounted beacon antenna fault detect
Method.
Background technology
In the CBTC control systems of track traffic, vehicle control syetem is read by the beacon capture device installed on train
Take on track arrange beacon come determine train be located position, for the management and control of train.For example, in publication number
In the Chinese patent application " urban railway transit train Anticollision information system " of CN104884331A, trackside equipment is marked including RFID
Sign, for storing place on line information；Mobile unit include RFID reader, for reading RFID tag in information.This shows
There is technology that RFID location technologies are applied to into urban track traffic main track, real time line labelling carried out to the position of running train,
Realize that system is tracked, record running orbit.
To the reading of beacon that is arranged on track as shown in Figure 1A, vehicle-mounted beacon capture device exists vehicle control syetem
By way of position 1 and position 2 when read the information of beacon T1 and T2 on track respectively, whereby carrying out the positioning of train.At present
Beacon read equipment be made up of two parts, one be transmission control main frame, one is beacon antenna, transmission control main frame drive
Dynamic beacon antenna, provides energy and activates beacon and carry out data transmission by electromagnetic radiation for beacon（Its principle is based on RFID skills
Art）, the reading to beacon message is then realized, beacon reads the composition framework of equipment as shown in Figure 1B.
Train positions the basis as the control of CBTC systems, and what beacon read that the reliability of equipment directly determines system can
The property used.In current CBTC control systems, beacon antenna adopts sole disposition, if beacon antenna breaks down, vehicle-mounted system
System cannot obtain train position, can only carry out pilot steering with very low speed, will so cause the fortune on rail line
Battalion's ability declines to a great extent, or even obstruction.
At present, beacon transmissions main frame cannot carry out effective detection to the failure of beacon antenna 3, therefore train can be caused to sail into
After operating line, just find to read beacon and cause positioning function to fail, train scheduling Hui Ku can only be overhauled.
The content of the invention
In view of problem above present in above-mentioned prior art, present invention aim at providing a kind of for vehicle-mounted beacon day
The System and method for of line fault detect.The present invention in order to solve the above problems, using passive detection technology, in a special track
Region（Operating line, the such as orbital region before outbound are not affected）It is upper to arrange corresponding detecting system, by it to beacon antenna
The detection of transmission power is determining the working condition of beacon antenna.Further, improved detection triggering and record be present invention employs
The judgment mode of mechanism, signal detection scheme and transmission power level, can reduce detection interference, improve reliability, accuracy
And detection efficiency.
The invention provides a kind of system for vehicle-mounted beacon antenna fault detect, it is characterised in that include：Vehicle-mounted letter
Mark, wheel detection device, ground antenna, ground fault detect main frame；Wherein,
Vehicle-mounted beacon is installed ON TRAINS, and vehicle-mounted beacon memory storage train identification information；
Wheel detection device triggers the ground fault detect main frame by detecting train wheel to sail detection zone into and enters letter
Mark read mode；
Fault detect main frame in ground connects ground antenna and carries out signal transmitting and receiving by ground antenna；Ground fault detect main frame exists
The vehicle-mounted beacon excited by ground antenna under the beacon read mode and the train mark letter of vehicle-mounted beacon storage is read
Breath；Also, fault detect main frame in ground switches to vehicle-mounted beacon antenna power detection pattern after train identification information is obtained,
The transmission signal of vehicle-mounted beacon antenna is received in this mode and its power characteristic is detected, vehicle-mounted beacon is judged by power characteristic
Whether antenna is in malfunction；After detecting the malfunction of vehicle-mounted beacon antenna, fault detect main frame in ground is by the failure
Control centre is bound and be uploaded to state with the train identification information of train.
Preferably, the system also includes being arranged on the fault detection status display lamp of trackside, when ground failure inspection
Host Detection is surveyed to after malfunction, fault detection status display lamp shows fault cues.
Preferably, the ground fault detect main frame includes that control process module, modulation transmitter, demodulation receive electricity
Road, power-sensing circuit；Wherein, the control process module is specifically included：Mission controller unit, reception recognition unit, work(
Rate judging unit, telecommunication unit and local control unit；Also, the ground antenna include first antenna part, the
Two antenna parts, isolated part and bonder；
Wherein, the mission controller unit is used to generate to send to the base band of vehicle-mounted beacon under the beacon read mode to refer to
Signal is made, the base band commands signal is used for the train identification information for instructing vehicle-mounted beacon transmissions itself to store, also, launches control
Device unit processed controls modulation transmitter and is radio frequency command signal by base band commands signal modulation and is transmitted, and control is adjusted
Radiating circuit processed stops sending the radio frequency command signal；
The base band commands signal that the modulation transmitter is provided mission controller unit by the way of orthogonal modulation enters
Row is modulated to generate the radio frequency command signal of first frequency；
The first antenna part is operated in the corresponding frequency range part of first frequency in the effective frequency range of antenna, for realize with it is vehicle-mounted
Signal transmitting and receiving between beacon, including：Send the radio frequency command signal and receive vehicle-mounted beacon and be excited what is transmitted afterwards
Back-scattered signal, the back-scattered signal carries the train identification information stored in vehicle-mounted beacon；
The bonder is connected to the first antenna part；Bonder adopts passive coupler, for preventing transmission signal from leaking；
The back-scattered signal that the demodulation receiving circuit is used for being received by first antenna part is demodulated, and will
The demodulated baseband signal of I-phase and Q-phase is delivered to reception recognition unit, and the identification for carrying out train identification information is obtained；
Second antenna part receives the transmission signal on the second frequency of vehicle-mounted beacon antenna transmitting；Second antenna part is divided the work
Make the corresponding frequency range part of second frequency in the effective frequency range of antenna, also, given with first antenna part by isolated part
Electromagnetic isolation；
The power-sensing circuit receives the transmission signal of vehicle-mounted beacon antenna from the second antenna part, to the nothing on second frequency
Line signal carries out power measurement, and measured value is supplied to into power judging unit；
Power judging unit analyzes the power characteristic of the transmission signal of vehicle-mounted beacon antenna according to measured value, is sentenced by power characteristic
Whether the vehicle-mounted beacon antenna that breaks is in malfunction；
Telecommunication unit is used to make fault detect main frame in ground realize the communication with long-range CBTC control centres, so as to examine
The malfunction for measuring is realized reporting after being bound with train identification information；
Local control unit is used for the control to the local warning facility such as fault detection status display lamp.
Preferably, the modulation transmitter includes that the first digital to analog converter, the first low pass filter, the second digital-to-analogue turn
Parallel operation, the second low pass filter, quadrature modulator, the first local oscillator, power amplifier；The demodulation receiving circuit includes
Low-noise amplifier, frequency mixer, the first gain controller, the first receiving filter, the first analog-digital converter, the second gain control
Device, the second receiving filter, the second analog-digital converter；The power-sensing circuit includes that passive filter, spectrum power are measured
Device.
Preferably, the default analysis Period Length T and excitation threshold C of power judging unit, and during quantitative analyses
Umber of pulse of the measured value more than excitation threshold C in segment length T, when the umber of pulse is less than a predetermined numerical value, is then judged with this
The transmission signal of vehicle-mounted beacon antenna is in malfunction.
The invention provides a kind of vehicle-mounted beacon antenna fault detection method, it is characterised in that comprise the following steps：
Step 1, detects train and sails into after detection zone by wheel detection device, makes ground fault detect main frame enter beacon
Read mode；
Step 2, when vehicle-mounted beacon enters effective receiving and transmitting signal region of ground antenna, by ground fault detect host computer control
Ground antenna launches radiofrequency signal, excites the vehicle-mounted beacon and reads the train identification information of vehicle-mounted beacon storage；
Step 3, makes fault detect mian engine changeover in ground to vehicle-mounted beacon antenna power detection pattern, and by ground antenna car is received
Carry the transmission signal of beacon antenna and detect its power characteristic, vehicle-mounted letter is judged by power characteristic by ground fault detect main frame
Whether mark antenna is in malfunction；
Step 4, after detecting the malfunction of vehicle-mounted beacon antenna, by ground fault detect main frame by the malfunction and train
Train identification information bind and be uploaded to control centre.
Preferably, in step 4, after detecting the malfunction of vehicle-mounted beacon antenna, by ground fault detect main frame control
Fault detection status display lamp processed shows fault cues.
Preferably, in step 2, under the beacon read mode, generated by ground fault detect main frame and sent to car
Information carrying target base band commands signal, the base band commands signal is used for the train mark letter for instructing vehicle-mounted beacon transmissions itself to store
Breath, is modulated to base band commands signal the radio frequency command signal of first frequency by the way of orthogonal modulation and is transmitted, with
And stopped sending the radio frequency command signal by ground fault detect host computer control modulation transmitter.
Preferably, in step 3, the transmission signal on the second frequency of vehicle-mounted beacon antenna transmitting is received, to the second frequency
Wireless signal in rate carries out power measurement, obtains measured value.
Preferably, in step 3, an analysis Period Length T and excitation threshold C, and segment length during quantitative analyses are preset
Umber of pulse of the measured value more than excitation threshold C in degree T, when the umber of pulse is less than a predetermined numerical value, then judges vehicle-mounted with this
The transmission signal of beacon antenna is in malfunction.
Present system composition is simple, and deployment is convenient, can be arranged into the special orbital region for not affecting to run, and throws in train
Enter and scented a hidden danger before operation, reduce the impact to runing；Present invention achieves the terminal detection of vehicle-mounted beacon antenna, detecting system
Just start to activate ground antenna only when tested measuring car is sailed into, can effectively save energy resource consumption, and possess simultaneously to driver and in
The function that the heart is reported；Ground detection main frame possesses passive power detection and active beacon reading both sides function, can do
To the binding of antenna failure state and train number；By antenna failure of trackside, can immediately to driver
Reminded, reduced the impact to railroad embankment.
Description of the drawings
Figure 1A -1B are that beacon of the prior art reads equipment working method and structural representation；
Fig. 2A -2B are the structures and course of work schematic diagram of vehicle-mounted beacon antenna fault detection system of the present invention；
Fig. 3 is the concrete structure schematic diagram of fault detect main frame in ground of the present invention and ground antenna；
Fig. 4 is the sample graph of the transmission signal power measurement values of vehicle-mounted beacon antenna A.
Specific embodiment
Below by embodiment, technical scheme is described in further detail.
Fig. 2A -2B show the structure and the course of work of vehicle-mounted beacon antenna fault detection system of the present invention.This
It is bright there is provided a kind of system for vehicle-mounted beacon antenna fault detect, including ground fault detect main frame 1, ground antenna 2, car
The fault detection status display lamp 5 of information carrying mark 3, wheel detection device 4 and trackside.Wherein, vehicle-mounted beacon 3 is arranged on train
Underbody portion, and vehicle-mounted beacon memory storage train identification information；Wheel detection device 4 sails detection zone into by detecting train wheel
Domain and trigger the ground fault detect main frame 1 into beacon read mode；Ground fault detect main frame 1 connects ground antenna 2
And signal transmitting and receiving is carried out by ground antenna 2；Ground fault detect main frame 1 passes through ground antenna under the beacon read mode
2 excite the vehicle-mounted beacon 3 and read the train identification information of vehicle-mounted beacon storage；Also, ground fault detect main frame 1 is being obtained
Obtained and vehicle-mounted beacon antenna power detection pattern was switched to after train identification information, vehicle-mounted beacon antenna A was received in this mode
Transmission signal and detect its power characteristic, judge vehicle-mounted beacon antenna A whether in malfunction by power characteristic；Detection
To after the malfunction of vehicle-mounted beacon antenna A, ground fault detect main frame 1 is by the train identification information of the malfunction and train
Bind and be uploaded to control centre, it is also possible to show fault cues by being arranged on the fault detection status display lamp 5 of trackside.
So as to the vehicle-mounted beacon antenna fault detection method of the present invention includes the procedure below as shown in Fig. 2A to 2B：
Step 1, detects train and sails into after detection zone by wheel detection device 4, notifies ground fault detect main frame 1；Ground
Face fault detect main frame 1 is received and enter after the notice beacon read mode；
Step 2, when vehicle-mounted beacon 3 enters effective receiving and transmitting signal region of ground antenna 2, the radio frequency letter of the transmitting of ground antenna 2
Number the energy excitation vehicle-mounted beacon 3 is provided, and read the signal that vehicle-mounted beacon 3 is provided by backscatter, obtained vehicle-mounted
The train identification information of the storage of beacon 3；
Step 3, after identification train, ground fault detect main frame 1 switches to vehicle-mounted beacon antenna power detection pattern, receives car
Carry the transmission signal of beacon antenna A and detect its power characteristic, judge vehicle-mounted beacon antenna A whether in event by power characteristic
Barrier state；
Step 4, after detecting the malfunction of vehicle-mounted beacon antenna A, ground fault detect main frame 1 is by the malfunction and train
Train identification information bind and be uploaded to control centre；Meanwhile, fault cues are shown by fault detection status display lamp 5,
With inform the fault detect of train operator's this car car antenna not over, it is impossible to put into effect.
During the vehicle-mounted beacon antenna fault detection system of the application present invention realizes above-mentioned detection, ground antenna is first
First transmission signal excites the vehicle-mounted beacon, then receives the reflected modulation signal of vehicle-mounted beacon therefrom to read vehicle-mounted beacon
The train identification information of storage, then receives the transmission signal of vehicle-mounted beacon antenna transmitting and detects its power characteristic again.With this
Meanwhile, train is in state in orbit, and it is actually very of short duration by way of the current duration of detection zone that this allows for train,
In this of short duration duration, ground fault detect main frame and ground antenna will successively experience beacon read mode and vehicle-mounted beacon
The complete procedure of antenna power detection pattern, this requires that the system all parts all possess stronger instantaneous service behaviour.
In fact, due to not possessing enough instantaneous service behaviours in all parts course of work, often bringing detection to lose
The consequence of effect.One is to obtain enough energy in the radiofrequency signal that vehicle-mounted beacon is launched from ground antenna to excite to reach
Need certain duration, if duration it cannot be guaranteed that, will result in that vehicle-mounted beacon can not be excited or ground antenna cannot be received
The signal of vehicle-mounted beacon reflection.It two is that vehicle-mounted beacon persistently produces reflected modulation signal after being excited in certain time length, because
And after ground fault detect main frame and ground antenna switch to vehicle-mounted beacon antenna power detection pattern, except vehicle-mounted beacon
Also continue to receive the reflected modulation signal of vehicle-mounted beacon outside the transmission signal of antenna, impact can be brought on power detection；By
To complete in very short time in whole detection process, it is also difficult to which the reflected modulation signal provided in vehicle-mounted beacon stops completely it
Afterwards the transmission signal of vehicle-mounted beacon antenna measured again, actually due to beacon read mode and vehicle-mounted beacon antenna power
Detection pattern switches very fast, to vehicle-mounted beacon provide reflected modulation signal reception and to vehicle-mounted beacon antenna transmitting believe
Number power measurement need to carry out parallel to a certain extent, this just have to consider reciprocal influence.It three is to sentence
Whether the transmission signal of disconnected vehicle-mounted beacon antenna will normally see that can the signal be enough to excite in the extremely short duration that train passes through
Back indicator, but the attribute of the impact due to train high-speed motion and antenna itself, the transmission signal to vehicle-mounted beacon antenna
A receiving power not steady-state value, a but undulating value, this results in based on some power threshold vehicle-mounted to judge
Whether normal the transmission signal of beacon antenna mode be very unreliable, thus it is for example possible to the simply ground antenna under the fluctuation of moment
The transmission signal power of the vehicle-mounted beacon antenna for detecting is higher than the threshold value, but on the whole the transmission signal can not be in train
Back indicator is excited in the extremely short duration for passing through, erroneous judgement has been thus resulted in.
In view of the problem of above several respects, of the invention that further ground fault detect main frame and ground antenna are changed
Enter.Specifically, in effective working frequency range of ground antenna, fault detect main frame in ground is modulated by ground antenna and launched
First frequency signal is used to excite the vehicle-mounted beacon, receives the vehicle-mounted beacon and is adjusted using the reflection that first frequency signal is formed
Signal processed；Also, vehicle-mounted beacon antenna launches second frequency signal, fault detect main frame in ground receives second by ground antenna
Frequency signal simultaneously carries out power detection.During power detection of the fault detect main frame in ground to second frequency signal, metering one
Received power value is more than the umber of pulse of an excitation threshold in the received power value of ground antenna, and the period in timing section, with
This whether normal foundation of transmission signal as vehicle-mounted beacon antenna.
Fig. 3 is the concrete structure schematic diagram of the ground fault detect main frame and ground antenna.Ground fault detect main frame 1
Including control process module 11, modulation transmitter 12, demodulation receiving circuit 13, power-sensing circuit 14；Wherein, the control
Processing module 11 is specifically included：Mission controller unit 1101, receive recognition unit 1102, power judging unit 1103, long-range
Communication unit 1104 and local control unit 1105.The modulation transmitter 12 include the first digital to analog converter 1201, the
One low pass filter 1202, the second digital to analog converter 1203, the second low pass filter 1204, quadrature modulator 1205, first
Ground agitator 1206, power amplifier 1207.The demodulation receiving circuit 13 includes low-noise amplifier 1301, frequency mixer
1302nd, the first gain controller 1303, the first receiving filter 1304, the first analog-digital converter 1305, the second gain controller
1306th, the second receiving filter 1307, the second analog-digital converter 1308.Power-sensing circuit 14 include passive filter 1401,
Spectrum power measuring device 1402.Also, the ground antenna 2 includes first antenna part 201, the second antenna part 202, isolation
Part 203 and bonder 204.
Mission controller unit 1101 is used to generate to send to the base band of vehicle-mounted beacon 3 under the beacon read mode to refer to
Signal is made, the base band commands signal is used to instruct the train identification information of itself storage of the transmission of vehicle-mounted beacon 3, also, launches control
Device unit 1101 processed controls modulation transmitter 12 and is radio frequency command signal by base band commands signal modulation and is transmitted, and
Control modulation transmitter 12 stops sending the radio frequency command signal, that is to say, that in each detection process, radio frequency command signal
Transmission duration be controlled by mission controller unit 1101.Mission controller unit 1101 can be read in the beacon
Make radio frequency command signal that there is enough transmission durations under delivery formula, to guarantee to excite vehicle-mounted beacon 3 to provide train
Identification information；For example, mission controller unit 1101 can confirm to obtain train identification information recognition unit 1102 is received
Afterwards just control stops the transmission of radio frequency command signal.
The base band that the modulation transmitter 12 is provided mission controller unit 1101 by the way of orthogonal modulation
Command signal is modulated to generate the radio frequency command signal；Modulation transmitter 12 is obtained from mission controller unit 1101
The base band commands signal of I, Q phase place, the base band commands signal of I phase places carries out digital signal to mould by the first digital to analog converter 1201
Intend the conversion of signal, the anti-mirror image filtering reconstruct that the first low pass filter 1202 is simulated signal is provided to, while entering
The adjustment of row gain；Similarly, the base band commands signal of Q phase places is by the second digital to analog converter 1203 and the second low pass filter
1204 carry out digital-to-analogue conversion and the filtering reconstruct of anti-mirror image；The baseband signal of two-way reconstruct is delivered to quadrature modulator 1205, orthogonal
The radio-frequency carrier of the first frequency that manipulator 1205 is provided the first local oscillator 1206 using the baseband signal of two-way reconstruct
It is modulated；Power amplifier 1207 carries out power amplification to the signal that quadrature modulator 1205 is exported, then through bonder
204 are supplied to the first antenna part 201 of ground antenna 2 to be launched.
The first antenna part 201 of ground antenna 2 is operated in the corresponding frequency range part of first frequency in the effective frequency range of antenna,
For the signal transmitting and receiving realized and between vehicle-mounted beacon 3.Also, bonder 204 is connected to the first antenna part 201；Coupling
Device 204 adopts passive coupler, and its effect is to prevent the transmission signal in receptor from leaking, so that the power of transmission signal
The overwhelming majority export to antenna avoid enter into demodulation receiving circuit 13 impact.First antenna part 201 is additionally operable to receive
Vehicle-mounted beacon 3 is excited the back-scattered signal transmitted afterwards, and the back-scattered signal carries the row stored in vehicle-mounted beacon 3
Car identification information.
The back-scattered signal that demodulation receiving circuit 13 is used for being received by first antenna part 201 is demodulated.
Wherein, the back-scattered signal under the first frequency of 1301 pairs of receptions of low-noise amplifier carries out gain amplification；Frequency mixer 1302
The radio-frequency carrier of the first step provided using first local oscillator 1206 carries out frequency conversion；First gain controller 1303
The demodulated baseband signal of I phases is obtained from frequency mixer 1302 and carry out gain amplification, then performed by the first receiving filter 1304
Filtering, then the I phase demodulated baseband signals that analog digital conversion generates digital signal are carried out by the first analog-digital converter 1305；It is similar
Ground, the second gain controller 1306, the second receiving filter 1307, the second analog-digital converter 1308 are used to generate digital signal
Q phase demodulated baseband signals.The demodulated baseband signal of I-phase and Q-phase is delivered to reception recognition unit 1102, carries out train identification information
Identification obtain.
Vehicle-mounted beacon antenna A can routinely launch the transmission signal on second frequency, and the transmission signal is mainly by ground
Second antenna part 202 of antenna 2 is received.It is corresponding that second antenna part 202 is operated in second frequency in the effective frequency range of antenna
Frequency range part, also, electromagnetic isolation is given by isolated part 203 and first antenna part 201, it is to avoid first antenna part
The interference that 201 signal transmitting band is come.
Power-sensing circuit 14 receives the transmitting letter of vehicle-mounted beacon antenna A from the second antenna part 202 of ground antenna 2
Number.Passive filter 1401 connects the second antenna part 202, and the passband of passive filter 1401 is centered on second frequency
Limited frequency on, for filtering other frequency signals, so as not to produce interference；The connected with passive of spectrum power measuring device 1402 is filtered
The outfan of device 1401, for carrying out power measurement to the wireless signal on second frequency, and is supplied to power to sentence measured value
Disconnected unit 1103.
Power judging unit 1103 is used for the measured value provided according to spectrum power measuring device 1402, analyzes vehicle-mounted beacon day
Whether the power characteristic of the transmission signal of line, judge vehicle-mounted beacon antenna in malfunction by power characteristic.Vehicle-mounted beacon
Whether the basis for estimation of failure is to see that can the signal be enough to excite rail in the extremely short duration that train passes through to antenna transmission signal
Road beacon, but the measured value that obtained of power judging unit 1103 is as shown in figure 4, a not steady-state value, but a fluctuation
Value.Therefore, whether power judging unit 1103 judges as follows vehicle-mounted beacon antenna in malfunction.First, work(
The default analysis Period Length T and excitation threshold C of rate judging unit 1103；When the measured value is more than excitation threshold C,
Show vehicle-mounted beacon antenna transmission signal now received by back indicator after its power be enough to excite the back indicator；Conversely,
Or measured value is less than excitation threshold C, then show the underpower of the transmission signal to excite back indicator.Due to the arteries and veins of measured value
Punching fluctuation, it will not be continuously on excitation threshold C, but as long as enough height is provided on the time period short enough
In the pulse of excitation threshold C, it becomes possible to ensure exciting for back indicator.Therefore, the quantitative analyses period of power judging unit 1103
Umber of pulse of the measured value more than excitation threshold C in length T, when the umber of pulse is less than a predetermined numerical value, then judges car with this
The transmission signal for carrying beacon antenna is in malfunction.
It is logical with long-range CBTC control centres that telecommunication unit 1104 realizes can ground fault detect main frame 1
Letter, so as to realize reporting after the malfunction for detecting is bound with train identification information.Also, local control unit
1105, according to the malfunction for detecting, realize the control to the local warning facility of the grade of fault detection status display lamp 5, for example, make
The display alarm of fault detection status display lamp 5.
Present system composition is simple, and deployment is convenient, can be arranged into the special orbital region for not affecting to run, and throws in train
Enter and scented a hidden danger before operation, reduce the impact to runing；Present invention achieves the terminal detection of vehicle-mounted beacon antenna, detecting system
Just start to activate ground antenna only when tested measuring car is sailed into, can effectively save energy resource consumption, and possess simultaneously to driver and in
The function that the heart is reported；Ground detection main frame possesses passive power detection and active beacon reading both sides function, can do
To the binding of antenna failure state and train number；By antenna failure of trackside, can immediately to driver
Reminded, reduced the impact to railroad embankment.
Above example is merely to illustrate the present invention, and not limitation of the present invention, about the common skill of technical field
Art personnel, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all etc.
Same technical scheme falls within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a kind of system for vehicle-mounted beacon antenna fault detect, it is characterised in that include：Vehicle-mounted beacon, wheel detection dress
Put, ground antenna, ground fault detect main frame；Wherein,
Vehicle-mounted beacon is installed ON TRAINS, and vehicle-mounted beacon memory storage train identification information；
Wheel detection device triggers the ground fault detect main frame by detecting train wheel to sail detection zone into and enters letter
Mark read mode；
Fault detect main frame in ground connects ground antenna and carries out signal transmitting and receiving by ground antenna；Ground fault detect main frame exists
The vehicle-mounted beacon excited by ground antenna under the beacon read mode and the train mark letter of vehicle-mounted beacon storage is read
Breath；Also, fault detect main frame in ground switches to vehicle-mounted beacon antenna power detection pattern after train identification information is obtained,
The transmission signal of vehicle-mounted beacon antenna is received in this mode and its power characteristic is detected, vehicle-mounted beacon is judged by power characteristic
Whether antenna is in malfunction；After detecting the malfunction of vehicle-mounted beacon antenna, fault detect main frame in ground is by the failure
Control centre is bound and be uploaded to state with the train identification information of train.
2. the system of vehicle-mounted beacon antenna fault detect according to claim 1, it is characterised in that the system also includes setting
The fault detection status display lamp in trackside is put, after the ground fault detect Host Detection is to malfunction, fault detect
State display lamp shows fault cues.
3. the system of vehicle-mounted beacon antenna fault detect according to claim 1, it is characterised in that the ground failure inspection
Surveying main frame includes control process module, modulation transmitter, demodulation receiving circuit, power-sensing circuit；Wherein, at the control
Reason module is specifically included：Mission controller unit, receive recognition unit, power judging unit, telecommunication unit and local
Control unit；Also, the ground antenna includes first antenna part, the second antenna part, isolated part and bonder；
Wherein, the mission controller unit is used to generate to send to the base band of vehicle-mounted beacon under the beacon read mode to refer to
Signal is made, the base band commands signal is used for the train identification information for instructing vehicle-mounted beacon transmissions itself to store, also, launches control
Device unit processed controls modulation transmitter and is radio frequency command signal by base band commands signal modulation and is transmitted, and control is adjusted
Radiating circuit processed stops sending the radio frequency command signal；
The base band commands signal that the modulation transmitter is provided mission controller unit by the way of orthogonal modulation enters
Row is modulated to generate the radio frequency command signal of first frequency；
The first antenna part is operated in the corresponding frequency range part of first frequency in the effective frequency range of antenna, for realize with it is vehicle-mounted
Signal transmitting and receiving between beacon, including：Send the radio frequency command signal and receive vehicle-mounted beacon and be excited what is transmitted afterwards
Back-scattered signal, the back-scattered signal carries the train identification information stored in vehicle-mounted beacon；
The bonder is connected to the first antenna part；Bonder adopts passive coupler, for preventing transmission signal from leaking；
The back-scattered signal that the demodulation receiving circuit is used for being received by first antenna part is demodulated, and will
The demodulated baseband signal of I-phase and Q-phase is delivered to reception recognition unit, and the identification for carrying out train identification information is obtained；
Second antenna part receives the transmission signal on the second frequency of vehicle-mounted beacon antenna transmitting；Second antenna part is divided the work
Make the corresponding frequency range part of second frequency in the effective frequency range of antenna, also, given with first antenna part by isolated part
Electromagnetic isolation；
The power-sensing circuit receives the transmission signal of vehicle-mounted beacon antenna from the second antenna part, to the nothing on second frequency
Line signal carries out power measurement, and measured value is supplied to into power judging unit；
Power judging unit analyzes the power characteristic of the transmission signal of vehicle-mounted beacon antenna according to measured value, is sentenced by power characteristic
Whether the vehicle-mounted beacon antenna that breaks is in malfunction；
Telecommunication unit is used to make fault detect main frame in ground realize the communication with long-range CBTC control centres, so as to examine
The malfunction for measuring is realized reporting after being bound with train identification information；
Local control unit is used for the control to the local warning facility such as fault detection status display lamp.
4. the system of vehicle-mounted beacon antenna fault detect according to claim 3, it is characterised in that the modulate emission electricity
Road include the first digital to analog converter, the first low pass filter, the second digital to analog converter, the second low pass filter, quadrature modulator,
First local oscillator, power amplifier；The demodulation receiving circuit includes low-noise amplifier, frequency mixer, the first gain control
Device processed, the first receiving filter, the first analog-digital converter, the second gain controller, the second receiving filter, the second analog digital conversion
Device；The power-sensing circuit includes passive filter, spectrum power measuring device.
5. the system of vehicle-mounted beacon antenna fault detect according to claim 3, it is characterised in that power judging unit is pre-
If arteries and veins of the measured value more than excitation threshold C in analysis a Period Length T and excitation threshold C, and quantitative analyses Period Length T
Number is rushed, when the umber of pulse is less than a predetermined numerical value, then failure shape is in this transmission signal for judging vehicle-mounted beacon antenna
State.
6. a kind of vehicle-mounted beacon antenna fault detection method, it is characterised in that comprise the following steps：
Step 1, detects train and sails into after detection zone by wheel detection device, makes ground fault detect main frame enter beacon
Read mode；
Step 2, when vehicle-mounted beacon enters effective receiving and transmitting signal region of ground antenna, by ground fault detect host computer control
Ground antenna launches radiofrequency signal, excites the vehicle-mounted beacon and reads the train identification information of vehicle-mounted beacon storage；
Step 3, makes fault detect mian engine changeover in ground to vehicle-mounted beacon antenna power detection pattern, and by ground antenna car is received
Carry the transmission signal of beacon antenna and detect its power characteristic, vehicle-mounted letter is judged by power characteristic by ground fault detect main frame
Whether mark antenna is in malfunction；
Step 4, after detecting the malfunction of vehicle-mounted beacon antenna, by ground fault detect main frame by the malfunction and train
Train identification information bind and be uploaded to control centre.
7. vehicle-mounted beacon antenna fault detection method according to claim 6, it is characterised in that in step 4, detect car
After carrying the malfunction of beacon antenna, fault cues are shown by ground fault detect host computer control fault detection status display lamp.
8. vehicle-mounted beacon antenna fault detection method according to claim 6, it is characterised in that in step 2, in the letter
Under mark read mode, the base band commands signal sent to vehicle-mounted beacon is generated by ground fault detect main frame, the base band commands letter
Number for instruct vehicle-mounted beacon transmissions itself store train identification information, by base band commands signal by the way of orthogonal modulation
It is modulated to the radio frequency command signal of first frequency and is transmitted, and by ground fault detect host computer control modulation transmitter
Stop sending the radio frequency command signal.
9. vehicle-mounted beacon antenna fault detection method according to claim 6, it is characterised in that in step 3, receives vehicle-mounted
Transmission signal on the second frequency of beacon antenna transmitting, to the wireless signal on second frequency power measurement is carried out, and is surveyed
Value.
10. vehicle-mounted beacon antenna fault detection method according to claim 9, it is characterised in that in step 3, presets one
Pulse of the measured value more than excitation threshold C in analysis Period Length T and excitation threshold C, and quantitative analyses Period Length T
Number, when the umber of pulse is less than a predetermined numerical value, is then in malfunction with this transmission signal for judging vehicle-mounted beacon antenna.
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