CN106585667B - A kind of System and method for for vehicle-mounted beacon antenna fault detection - Google Patents
A kind of System and method for for vehicle-mounted beacon antenna fault detection Download PDFInfo
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- CN106585667B CN106585667B CN201611170113.1A CN201611170113A CN106585667B CN 106585667 B CN106585667 B CN 106585667B CN 201611170113 A CN201611170113 A CN 201611170113A CN 106585667 B CN106585667 B CN 106585667B
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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 train
- B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
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- 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 trains
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Abstract
The present invention provides a kind of System and method for for vehicle-mounted beacon antenna fault detection.The present invention uses passive detection technology, arranges corresponding detection system on a special orbital region (operating line not being influenced, such as the orbital region before outbound), determines the working condition of beacon antenna to the detection of beacon antenna transmission power by it.In turn, present invention employs the judgment mode of improved detection triggering and recording mechanism, signal detection scheme and transmission power level, detection interference can be reduced, reliability, accuracy and detection efficiency are improved.
Description
Technical Field
The invention relates to a CBTC (Communication Based Train Control System) technology of rail transit, in particular to a System and a method for detecting faults of a vehicle-mounted beacon antenna.
Background
In a CBTC control system for rail transit, a vehicle-mounted control system reads a beacon arranged on a rail through a beacon capture device installed on a train to determine a location where the train is located, for management and control of the train. For example, in chinese patent application publication No. CN104884331A, "urban rail transit train collision avoidance information system", the trackside equipment includes an RFID tag for storing route location information; the in-vehicle device includes an RFID reader for reading information in the RFID tag. In the prior art, the RFID positioning technology is applied to the urban rail transit main line, the position of a running train is marked in real time, the system tracking is realized, and the running track is recorded.
Reading of the beacons arranged on the track by the vehicle-mounted control system as shown in fig. 1A, the vehicle-mounted beacon capture device reads information of the beacons T1 and T2 on the track when passing through the position 1 and the position 2, respectively, thereby locating the train. The existing beacon reading device is composed of two parts, one is a transmission control host, the other is a beacon antenna, the transmission control host drives the beacon antenna, the beacon is powered by electromagnetic radiation and activated to perform data transmission (the principle of the beacon is based on the RFID technology), and then reading of beacon information is achieved, and a composition framework of the beacon reading device is shown in fig. 1B.
Train location is the basis for CBTC system control, and the reliability of the beacon reading device directly determines the availability of the system. In the current CBTC control system, the beacon antenna all adopts single configuration, if the beacon antenna breaks down, then the train position can't be obtained to on-vehicle system, can only carry out manual driving with very low speed, will cause the operation ability on the track traffic route to descend by a wide margin like this, even block.
At present, a beacon transmission host cannot effectively detect the fault of a beacon antenna 3, so that the failure of a positioning function caused by the fact that a beacon cannot be read is found after a train enters an operation line, and the train can only be dispatched back to a warehouse for overhauling.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is directed to a system and method for vehicle-mounted beacon antenna fault detection. In order to solve the problems, the invention adopts a passive detection technology, arranges a corresponding detection system on a special track area (not influencing an operation line, such as the track area before warehouse-out), and determines the working condition of the beacon antenna by detecting the transmission power of the beacon antenna. Furthermore, the invention adopts an improved detection triggering and recording mechanism, a signal detection mechanism and a judgment mode of the emission power level, so that the detection interference can be reduced, and the reliability, the accuracy and the detection efficiency can be improved.
The invention provides a system for detecting the fault of a vehicle-mounted beacon antenna, which is characterized by comprising the following components: the system comprises a vehicle-mounted beacon, a wheel detection device, a ground antenna and a ground fault detection host; wherein,
the train-mounted beacon is arranged on a train and stores train identification information;
the wheel detection device triggers the ground fault detection host to enter a beacon reading mode by detecting that train wheels enter a detection area;
the ground fault detection host is connected with the ground antenna and receives and transmits signals through the ground antenna; the ground fault detection host excites the vehicle-mounted beacon through a ground antenna in the beacon reading mode and reads train identification information stored in the vehicle-mounted beacon; the ground fault detection host is switched to a power detection mode of the vehicle-mounted beacon antenna after obtaining the train identification information, receives a transmission signal of the vehicle-mounted beacon antenna in the mode and detects the power characteristic of the transmission signal, and judges whether the vehicle-mounted beacon antenna is in a fault state or not according to the power characteristic; after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host binds the fault state with train identification information of a train and uploads the fault state to the control center.
Preferably, the system further comprises a fault detection state display lamp arranged beside the rail, and when the ground fault detection host detects a fault state, the fault detection state display lamp displays a fault prompt.
Preferably, the ground fault detection host comprises a control processing module, a modulation transmitting circuit, a demodulation receiving circuit and a power detection circuit; wherein, the control processing module specifically comprises: the device comprises a transmitting controller unit, a receiving identification unit, a power judgment unit, a remote communication unit and a local control unit; and, the terrestrial antenna includes a first antenna portion, a second antenna portion, an isolation portion, and a coupler;
the transmission controller unit is used for generating a baseband instruction signal which is sent to the vehicle-mounted beacon in the beacon reading mode, wherein the baseband instruction signal is used for instructing the vehicle-mounted beacon to transmit train identification information stored in the vehicle-mounted beacon, and the transmission controller unit controls the modulation transmitting circuit to modulate the baseband instruction signal into a radio frequency instruction signal and send the radio frequency instruction signal, and controls the modulation transmitting circuit to stop sending the radio frequency instruction signal;
the modulation transmitting circuit modulates a baseband instruction signal provided by a transmitting controller unit in a quadrature modulation mode to generate the radio frequency instruction signal of a first frequency;
the first antenna part works in a frequency band part corresponding to a first frequency in an effective frequency band of the antenna, and is used for realizing signal transceiving with a vehicle-mounted beacon, and the method comprises the following steps: sending the radio frequency instruction signal and receiving a backscatter signal transmitted after the vehicle-mounted beacon is excited, wherein the backscatter signal carries train identification information stored in the vehicle-mounted beacon;
the coupler is connected to the first antenna portion; the coupler adopts a passive coupler and is used for preventing the leakage of a transmitting signal;
the demodulation receiving circuit is used for demodulating the backscatter signals received by the first antenna part, and transmitting baseband demodulation signals of an I phase and a Q phase to a receiving and identifying unit for identifying and acquiring train identification information;
the second antenna part receives a transmission signal on a second frequency transmitted by the vehicle-mounted beacon antenna; the second antenna part works in a frequency band part corresponding to a second frequency in an effective frequency band of the antenna, and is electromagnetically isolated from the first antenna part through the isolation part;
the power detection circuit receives the transmission signal of the vehicle-mounted beacon antenna from the second antenna part, measures the power of the wireless signal on the second frequency and provides the measured value to the power judgment unit;
the power judging unit analyzes the power characteristic of a transmitting signal of the vehicle-mounted beacon antenna according to the measured value and judges whether the vehicle-mounted beacon antenna is in a fault state or not according to the power characteristic;
the remote communication unit is used for enabling the ground fault detection host to realize communication with a remote CBTC control center, so that the detected fault state is bound with train identification information and then reported;
the local control unit is used for controlling local alarm facilities such as fault detection state display lamps and the like.
Preferably, the modulation transmitting circuit comprises a first digital-to-analog converter, a first low-pass filter, a second digital-to-analog converter, a second low-pass filter, a quadrature modulator, a first local oscillator, and a power amplifier; the demodulation receiving circuit comprises a low noise amplifier, a mixer, a first gain controller, a first receiving filter, a first analog-to-digital converter, a second gain controller, a second receiving filter and a second analog-to-digital converter; the power detection circuit comprises a passive filter and a spectrum power measurer.
Preferably, the power determination unit presets an analysis period length T and an excitation threshold C, counts the number of pulses whose measurement value is greater than the excitation threshold C within the analysis period length T, and determines that the transmission signal of the vehicle-mounted beacon antenna is in a fault state when the number of pulses is less than a predetermined value.
The invention provides a method for detecting the fault of an antenna of a vehicle-mounted beacon, which is characterized by comprising the following steps of:
step 1, after a wheel detection device detects that a train enters a detection area, a ground fault detection host enters a beacon reading mode;
step 2, when the vehicle-mounted beacon enters an effective signal receiving and transmitting area of the ground antenna, controlling the ground antenna to transmit a radio frequency signal through the ground fault detection host, exciting the vehicle-mounted beacon and reading train identification information stored in the vehicle-mounted beacon;
step 3, switching the ground fault detection host to a power detection mode of the vehicle-mounted beacon antenna, receiving a transmission signal of the vehicle-mounted beacon antenna through the ground antenna and detecting the power characteristic of the transmission signal, and judging whether the vehicle-mounted beacon antenna is in a fault state or not through the power characteristic by the ground fault detection host;
and 4, after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host binds the fault state and the train identification information of the train and uploads the fault state and the train identification information to the control center.
Preferably, in step 4, after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host controls the fault detection state display lamp to display the fault prompt.
Preferably, in the step 2, in the beacon reading mode, the ground fault detection host generates a baseband instruction signal to be sent to the vehicle-mounted beacon, where the baseband instruction signal is used to instruct the vehicle-mounted beacon to transmit train identification information stored in the vehicle-mounted beacon, the baseband instruction signal is modulated into a radio frequency instruction signal with a first frequency in a quadrature modulation manner and sent, and the ground fault detection host controls the modulation and transmission circuit to stop sending the radio frequency instruction signal.
Preferably, in step 3, the transmission signal at the second frequency transmitted by the vehicle-mounted beacon antenna is received, and the power of the wireless signal at the second frequency is measured to obtain the measurement value.
Preferably, in step 3, an analysis period length T and an excitation threshold value C are preset, and the number of pulses in the analysis period length T, the measurement value of which is greater than the excitation threshold value C, is counted, and when the number of pulses is less than a predetermined value, it is determined that the transmission signal of the vehicle-mounted beacon antenna is in a failure state.
The system is simple in composition and convenient to deploy, can be arranged in a special track area which does not influence operation, finds hidden dangers before a train is put into operation, and reduces influence on operation; the invention realizes the terminal detection of the vehicle-mounted beacon antenna, the detection system starts to activate the ground antenna only when the detected vehicle enters, the energy consumption can be effectively saved, and the function of reporting to a driver and a center simultaneously is realized; the ground detection host has the functions of passive power detection and active beacon reading, and can bind the antenna fault state and the train number; through the antenna fault state display device beside the rail, the driver can be immediately reminded, and the influence on line operation is reduced.
Drawings
FIGS. 1A-1B are schematic diagrams illustrating the operation and structure of a beacon reading device in the prior art;
FIGS. 2A-2B are schematic diagrams illustrating the structure and operation of the system for detecting antenna faults of a vehicle-mounted beacon according to the present invention;
fig. 3 is a schematic structural diagram of the ground fault detection host and the ground antenna according to the present invention;
fig. 4 is a sampling chart of the transmitted signal power measurements of the vehicle beacon antenna a.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments.
Fig. 2A-2B illustrate the structure and operation of the system for detecting the antenna fault of the vehicle-mounted beacon according to the present invention. The invention provides a system for detecting faults of a vehicle-mounted beacon antenna, which comprises a ground fault detection host 1, a ground antenna 2, a vehicle-mounted beacon 3, a wheel detection device 4 and a trackside fault detection state display lamp 5. The train-mounted beacon 3 is arranged at the bottom of a train and stores train identification information; the wheel detection device 4 triggers the ground fault detection host 1 to enter a beacon reading mode by detecting that the train wheels enter a detection area; the ground fault detection host 1 is connected with the ground antenna 2 and receives and transmits signals through the ground antenna 2; the ground fault detection host 1 excites the vehicle-mounted beacon 3 through the ground antenna 2 in the beacon reading mode and reads train identification information stored in the vehicle-mounted beacon; the ground fault detection host 1 switches to a power detection mode of the vehicle-mounted beacon antenna after obtaining the train identification information, receives a transmission signal of the vehicle-mounted beacon antenna A in the power detection mode, detects the power characteristic of the transmission signal, and judges whether the vehicle-mounted beacon antenna A is in a fault state or not according to the power characteristic; after the fault state of the vehicle-mounted beacon antenna A is detected, the ground fault detection host 1 binds the fault state with train identification information of a train and uploads the fault state to a control center, and fault prompt can be displayed through a fault detection state display lamp 5 arranged beside the track.
Thus, the vehicle-mounted beacon antenna fault detection method of the present invention includes the following processes as shown in fig. 2A to 2B:
step 1, after detecting that a train enters a detection area through a wheel detection device 4, informing a ground fault detection host 1; the ground fault detection host 1 enters a beacon reading mode after receiving the notification;
step 2, when the vehicle-mounted beacon 3 enters the effective signal receiving and transmitting area of the ground antenna 2, the radio frequency signal emitted by the ground antenna 2 provides energy to excite the vehicle-mounted beacon 3, and the signal provided by the vehicle-mounted beacon 3 through backscattering is read to obtain the train identification information stored by the vehicle-mounted beacon 3;
step 3, after the train is identified, the ground fault detection host 1 is switched to a power detection mode of the vehicle-mounted beacon antenna, receives a transmission signal of the vehicle-mounted beacon antenna A and detects the power characteristic of the transmission signal, and judges whether the vehicle-mounted beacon antenna A is in a fault state or not according to the power characteristic;
step 4, after detecting the fault state of the vehicle-mounted beacon antenna A, the ground fault detection host 1 binds the fault state with train identification information of a train and uploads the fault state to a control center; meanwhile, a fault detection state display lamp 5 displays a fault prompt to inform a train driver that the fault detection of the vehicle-mounted antenna fails and the vehicle-mounted antenna cannot be put into operation.
In the process of realizing the detection by applying the vehicle-mounted beacon antenna fault detection system, the ground antenna firstly emits signals to excite the vehicle-mounted beacon, then receives the reflection modulation signals of the vehicle-mounted beacon so as to read the train identification information stored in the vehicle-mounted beacon, and then receives the emitted signals emitted by the vehicle-mounted beacon antenna and detects the power characteristics of the vehicle-mounted beacon. Meanwhile, the train is in an on-track running state, so that the passing time of the train passing through a detection area is very short in practice, and in the short time, the ground fault detection host and the ground antenna are subjected to the complete process of a beacon reading mode and a vehicle-mounted beacon antenna power detection mode in sequence, so that all parts of the system are required to have stronger instantaneous working performance.
In fact, the failure of detection is often caused by insufficient instantaneous operation performance of each component during operation. One of the problems is that the vehicle-mounted beacon obtains enough energy from the radio frequency signal transmitted by the ground antenna to achieve excitation for a certain time, and if the time cannot be guaranteed, the vehicle-mounted beacon cannot be excited or the ground antenna cannot receive the signal reflected by the vehicle-mounted beacon. Secondly, after the vehicle-mounted beacon is excited, the reflection modulation signal is continuously generated for a certain time, so that after the ground fault detection host and the ground antenna are switched to a power detection mode of the vehicle-mounted beacon antenna, the reflection modulation signal of the vehicle-mounted beacon is continuously received in addition to the transmission signal of the vehicle-mounted beacon antenna, and the power detection is influenced; since the whole detection process is completed in a very short time, it is difficult to measure the transmission signal of the vehicle-mounted beacon antenna after the reflected modulation signal provided by the vehicle-mounted beacon completely stops, and actually, since the beacon reading mode and the power detection mode of the vehicle-mounted beacon antenna are switched very fast, the reception of the reflected modulation signal provided by the vehicle-mounted beacon and the power measurement of the transmission signal of the vehicle-mounted beacon antenna need to be performed in parallel to some extent, and thus, the mutual influence must be considered. The third is that whether the transmission signal of the vehicle-mounted beacon antenna is normal or not is judged to see whether the signal can sufficiently excite the track beacon within the extremely short time period for the train to pass through, but due to the influence of high-speed movement of the train and the property of the antenna, the receiving power of the transmission signal of the vehicle-mounted beacon antenna is not a steady-state value but a fluctuation value, so that the mode of judging whether the transmission signal of the vehicle-mounted beacon antenna is normal or not based on a certain power threshold value is not reliable, for example, the transmission signal power of the vehicle-mounted beacon antenna detected by the ground antenna is higher than the threshold value only under instant fluctuation, but the transmission signal cannot excite the track beacon within the extremely short time period for the train to pass through, and therefore misjudgment is caused.
In view of the above problems, the present invention further improves the ground fault detection host and the ground antenna. Specifically, in an effective working frequency band of a ground antenna, a ground fault detection host modulates and transmits a first frequency signal through the ground antenna to excite the vehicle-mounted beacon and receives a reflection modulation signal formed by the vehicle-mounted beacon by using the first frequency signal; and the vehicle-mounted beacon antenna transmits a second frequency signal, and the ground fault detection host receives the second frequency signal through the ground antenna and performs power detection. And in the process of detecting the power of the second frequency signal by the ground fault detection host, measuring the receiving power value of the ground antenna in a certain period of time and the number of pulses of which the receiving power value is greater than an excitation threshold value in the period of time, and taking the number of pulses as the basis for judging whether the transmitted signal of the vehicle-mounted beacon antenna is normal or not.
Fig. 3 is a schematic diagram of a specific structure of the ground fault detection host and the ground antenna. The ground fault detection host 1 comprises a control processing module 11, a modulation transmitting circuit 12, a demodulation receiving circuit 13 and a power detection circuit 14; the control processing module 11 specifically includes: a transmission controller unit 1101, a reception identifying unit 1102, a power judging unit 1103, a remote communication unit 1104, and a local control unit 1105. The modulation transmission circuit 12 includes a first digital-to-analog converter 1201, a first low-pass filter 1202, a second digital-to-analog converter 1203, a second low-pass filter 1204, a quadrature modulator 1205, a first local oscillator 1206, and a power amplifier 1207. The demodulation receiving circuit 13 includes a low noise amplifier 1301, a mixer 1302, a first gain controller 1303, a first receiving filter 1304, a first analog-to-digital converter 1305, a second gain controller 1306, a second receiving filter 1307, and a second analog-to-digital converter 1308. The power detection circuit 14 includes a passive filter 1401, and a spectral power measurer 1402. Also, the terrestrial antenna 2 includes a first antenna portion 201, a second antenna portion 202, an isolation portion 203, and a coupler 204.
The transmission controller unit 1101 is configured to generate a baseband instruction signal to be sent to the on-board beacon 3 in the beacon reading mode, where the baseband instruction signal is used to instruct the on-board beacon 3 to transmit train identification information stored in the on-board beacon 3, and the transmission controller unit 1101 controls the modulation and transmission circuit 12 to modulate the baseband instruction signal into a radio frequency instruction signal and send the radio frequency instruction signal, and controls the modulation and transmission circuit 12 to stop sending the radio frequency instruction signal, that is, the duration of sending the radio frequency instruction signal is controlled by the transmission controller unit 1101 in each detection process. The transmission controller unit 1101 may enable the radio frequency command signal to have a sufficient transmission duration in the beacon reading mode to ensure that the on-board beacon 3 can be activated to provide train identification information; for example, the transmission controller unit 1101 may control the transmission of the stop radio frequency instruction signal after the reception identifying unit 1102 confirms that the train identification information is obtained.
The modulation transmitting circuit 12 modulates the baseband instruction signal provided by the transmission controller unit 1101 in a quadrature modulation manner to generate the radio frequency instruction signal; the modulation transmission circuit 12 obtains I, Q-phase baseband instruction signals from the transmission controller unit 1101, and the I-phase baseband instruction signals are converted from digital signals to analog signals by the first digital-to-analog converter 1201 and then supplied to the first low-pass filter 1202 for inverse image filtering reconstruction of the analog signals, and meanwhile, gain adjustment is performed; similarly, the baseband command signal of the Q phase is reconstructed by digital-to-analog conversion and inverse image filtering by the second digital-to-analog converter 1203 and the second low-pass filter 1204; the two paths of reconstructed baseband signals are transmitted to the quadrature modulator 1205, and the quadrature modulator 1205 modulates the radio frequency carrier wave of the first frequency provided by the first local oscillator 1206 by using the two paths of reconstructed baseband signals; the power amplifier 1207 power-amplifies the signal output from the quadrature modulator 1205 and supplies it to the first antenna section 201 of the terrestrial antenna 2 via the coupler 204 for transmission.
The first antenna part 201 of the ground antenna 2 operates in a frequency band part corresponding to the first frequency in the antenna effective frequency band, and is used for realizing signal transceiving with the vehicle-mounted beacon 3. And, a coupler 204 is connected to the first antenna portion 201; the coupler 204 is a passive coupler, and functions to prevent the leakage of the transmission signal in the receiver, so that most of the power of the transmission signal is output to the antenna and prevented from entering the demodulation and reception circuit 13. The first antenna section 201 is also configured to receive a backscatter signal transmitted after the on-board beacon 3 is excited, the backscatter signal carrying train identification information stored in the on-board beacon 3.
The demodulation receiving circuit 13 is arranged to demodulate said backscattered signal received by the first antenna part 201. The low noise amplifier 1301 performs gain amplification on the received backscatter signal at the first frequency; the mixer 1302 performs frequency conversion by using the radio frequency carrier of the first step provided by the first local oscillator 1206; the first gain controller 1303 obtains the I-phase baseband demodulation signal from the mixer 1302, performs gain amplification, performs filtering by the first receiving filter 1304, and performs analog-to-digital conversion by the first analog-to-digital converter 1305 to generate an I-phase baseband demodulation signal of a digital signal; similarly, the second gain controller 1306, the second receiving filter 1307, and the second analog-to-digital converter 1308 are configured to generate a Q-phase baseband demodulation signal of the digital signal. The I-phase and Q-phase baseband demodulated signals are transmitted to the reception identifying unit 1102, and train identification information is identified and acquired.
The vehicle beacon antenna a will continuously transmit a transmitted signal at the second frequency which is primarily received by the second antenna portion 202 of the ground antenna 2. The second antenna portion 202 operates in a frequency band portion corresponding to the second frequency in the antenna effective frequency band, and is electromagnetically isolated from the first antenna portion 201 by the isolation portion 203, so that interference caused by signal transmission of the first antenna portion 201 is avoided.
The power detection circuit 14 receives the transmission signal of the vehicle-mounted beacon antenna a from the second antenna portion 202 of the ground antenna 2. A passive filter 1401 is connected to the second antenna part 202, and the passband of the passive filter 1401 is in a limited band centered on the second frequency, and is used for filtering out other frequency signals so as not to generate interference; the spectral power measurer 1402 is connected to the output of the passive filter 1401, and is configured to measure the power of the wireless signal at the second frequency and provide the measured value to the power determination unit 1103.
The power determining unit 1103 is configured to analyze a power characteristic of a transmission signal of the vehicle-mounted beacon antenna according to the measurement value provided by the spectrum power measurer 1402, and determine whether the vehicle-mounted beacon antenna is in a failure state according to the power characteristic. The judgment of whether the signal transmitted by the vehicle-mounted beacon antenna is faulty is based on whether the signal can sufficiently excite the track beacon within a very short time period for the train to pass through, but the measurement value obtained by the power judgment unit 1103 is not a steady-state value but a fluctuation value as shown in fig. 4. Therefore, the power determination unit 1103 determines whether or not the vehicle-mounted beacon antenna is in a failure state as follows. First, the power determining unit 1103 presets an analysis period length T and an excitation threshold C; when the measured value is larger than the excitation threshold value C, the power of the transmission signal of the vehicle-mounted beacon antenna at the moment is enough to excite the track beacon after the transmission signal is received by the track beacon; conversely, or if the measured value is below the excitation threshold C, it indicates that the power of the transmitted signal is insufficient to excite the orbital beacon. Due to the pulse fluctuations of the measured values, they do not continue above the excitation threshold C, but the excitation of the track beacon can be ensured as long as a sufficiently large number of pulses above the excitation threshold C are provided over a sufficiently short period of time. Therefore, the power determining unit 1103 counts the number of pulses having a measurement value greater than the excitation threshold C within the analysis period length T, and determines that the transmission signal of the vehicle-mounted beacon antenna is in a failure state when the number of pulses is less than a predetermined value.
The remote communication unit 1104 enables the ground fault detection host 1 to communicate with a remote CBTC control center, so as to bind the detected fault state with the train identification information and then report the fault state. The local control unit 1105 controls the local alarm facility such as the failure detection state display lamp 5 based on the detected failure state, and for example, displays an alarm on the failure detection state display lamp 5.
The system is simple in composition and convenient to deploy, can be arranged in a special track area which does not influence operation, finds hidden dangers before a train is put into operation, and reduces influence on operation; the invention realizes the terminal detection of the vehicle-mounted beacon antenna, the detection system starts to activate the ground antenna only when the detected vehicle enters, the energy consumption can be effectively saved, and the function of reporting to a driver and a center simultaneously is realized; the ground detection host has the functions of passive power detection and active beacon reading, and can bind the antenna fault state and the train number; through the antenna fault state display device beside the rail, the driver can be immediately reminded, and the influence on line operation is reduced.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (9)
1. A system for vehicle-mounted beacon antenna fault detection, comprising: the system comprises a vehicle-mounted beacon, a wheel detection device, a ground antenna and a ground fault detection host; wherein,
the train-mounted beacon is arranged on a train and stores train identification information;
the wheel detection device triggers the ground fault detection host to enter a beacon reading mode by detecting that train wheels enter a detection area;
the ground fault detection host is connected with the ground antenna and receives and transmits signals through the ground antenna; the ground fault detection host excites the vehicle-mounted beacon through a ground antenna in the beacon reading mode and reads train identification information stored in the vehicle-mounted beacon; the ground fault detection host is switched to a power detection mode of the vehicle-mounted beacon antenna after obtaining the train identification information, receives a transmission signal of the vehicle-mounted beacon antenna in the mode and detects the power characteristic of the transmission signal, and judges whether the vehicle-mounted beacon antenna is in a fault state or not according to the power characteristic; after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host binds the fault state with train identification information of a train and uploads the fault state to a control center;
the ground fault detection host comprises a control processing module, a modulation transmitting circuit, a demodulation receiving circuit and a power detection circuit; wherein, the control processing module specifically comprises: the device comprises a transmitting controller unit, a receiving identification unit, a power judgment unit, a remote communication unit and a local control unit; and, the terrestrial antenna includes a first antenna portion, a second antenna portion, an isolation portion, and a coupler;
the transmission controller unit is used for generating a baseband instruction signal which is sent to the vehicle-mounted beacon in the beacon reading mode, wherein the baseband instruction signal is used for instructing the vehicle-mounted beacon to transmit train identification information stored in the vehicle-mounted beacon, and the transmission controller unit controls the modulation transmitting circuit to modulate the baseband instruction signal into a radio frequency instruction signal and send the radio frequency instruction signal, and controls the modulation transmitting circuit to stop sending the radio frequency instruction signal;
the modulation transmitting circuit modulates a baseband instruction signal provided by a transmitting controller unit in a quadrature modulation mode to generate the radio frequency instruction signal of a first frequency;
the first antenna part works in a frequency band part corresponding to a first frequency in an effective frequency band of the antenna, and is used for realizing signal transceiving with a vehicle-mounted beacon, and the method comprises the following steps: sending the radio frequency instruction signal and receiving a backscatter signal transmitted after the vehicle-mounted beacon is excited, wherein the backscatter signal carries train identification information stored in the vehicle-mounted beacon;
the coupler is connected to the first antenna portion; the coupler adopts a passive coupler and is used for preventing the leakage of a transmitting signal;
the demodulation receiving circuit is used for demodulating the backscatter signals received by the first antenna part, and transmitting baseband demodulation signals of an I phase and a Q phase to a receiving and identifying unit for identifying and acquiring train identification information;
the second antenna part receives a transmission signal on a second frequency transmitted by the vehicle-mounted beacon antenna; the second antenna part works in a frequency band part corresponding to a second frequency in an effective frequency band of the antenna, and is electromagnetically isolated from the first antenna part through the isolation part;
the power detection circuit receives the transmission signal of the vehicle-mounted beacon antenna from the second antenna part, measures the power of the wireless signal on the second frequency and provides the measured value to the power judgment unit;
the power judging unit analyzes the power characteristic of a transmitting signal of the vehicle-mounted beacon antenna according to the measured value and judges whether the vehicle-mounted beacon antenna is in a fault state or not according to the power characteristic;
the remote communication unit is used for enabling the ground fault detection host to realize communication with a remote CBTC control center, so that the detected fault state is bound with train identification information and then reported;
the local control unit is used for controlling the local alarm facility.
2. The system for detecting the faults of the vehicle-mounted beacon antenna as claimed in claim 1, further comprising a fault detection state display lamp arranged beside the track, wherein the fault detection state display lamp displays a fault prompt after the ground fault detection host detects the fault state.
3. The system for vehicle beacon antenna fault detection according to claim 1, wherein the modulation transmission circuit comprises a first digital-to-analog converter, a first low pass filter, a second digital-to-analog converter, a second low pass filter, a quadrature modulator, a first local oscillator, and a power amplifier; the demodulation receiving circuit comprises a low noise amplifier, a mixer, a first gain controller, a first receiving filter, a first analog-to-digital converter, a second gain controller, a second receiving filter and a second analog-to-digital converter; the power detection circuit includes a passive filter and a spectral power measurer.
4. The system for detecting faults of an antenna of a vehicle-mounted beacon according to claim 1, wherein the power judgment unit presets an analysis period length T and an excitation threshold value C, counts the number of pulses within the analysis period length T, the measured value of which is greater than the excitation threshold value C, and judges that the transmission signal of the antenna of the vehicle-mounted beacon is in a fault state when the number of pulses is less than a preset value.
5. A method for detecting faults of an antenna of a vehicle-mounted beacon is characterized by comprising the following steps:
step 1, after a wheel detection device detects that a train enters a detection area, a ground fault detection host enters a beacon reading mode;
step 2, when the vehicle-mounted beacon enters an effective signal receiving and transmitting area of the ground antenna, controlling the ground antenna to transmit a radio frequency signal through the ground fault detection host, exciting the vehicle-mounted beacon and reading train identification information stored in the vehicle-mounted beacon;
step 3, switching the ground fault detection host to a power detection mode of the vehicle-mounted beacon antenna, receiving a transmission signal of the vehicle-mounted beacon antenna through the ground antenna and detecting the power characteristic of the transmission signal, and judging whether the vehicle-mounted beacon antenna is in a fault state or not through the power characteristic by the ground fault detection host;
and 4, after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host binds the fault state and the train identification information of the train and uploads the fault state and the train identification information to the control center.
6. The method for detecting the fault of the vehicle-mounted beacon antenna according to claim 5, wherein in the step 4, after the fault state of the vehicle-mounted beacon antenna is detected, the ground fault detection host controls the fault detection state display lamp to display the fault prompt.
7. The method according to claim 5, wherein in the beacon reading mode, the ground fault detection host generates a baseband command signal to be sent to the vehicle beacon, the baseband command signal is used for commanding the vehicle beacon to transmit train identification information stored in the vehicle beacon, the baseband command signal is modulated into a radio frequency command signal of the first frequency by adopting a quadrature modulation mode and sent, and the ground fault detection host controls the modulation transmission circuit to stop sending the radio frequency command signal.
8. The method for detecting faults of an antenna of a vehicle-mounted beacon according to claim 5, wherein in step 3, the transmitted signal at the second frequency transmitted by the antenna of the vehicle-mounted beacon is received, and the power of the wireless signal at the second frequency is measured to obtain the measured value.
9. The method for detecting antenna failure of a vehicle-mounted beacon according to claim 8, wherein in step 3, an analysis period length T and an excitation threshold C are preset, and the number of pulses within the analysis period length T, the number of which is greater than the excitation threshold C, is counted, and when the number of pulses is less than a predetermined value, it is determined that the transmission signal of the vehicle-mounted beacon antenna is in a failure state.
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| CN107182051B (en) * | 2017-07-10 | 2020-05-26 | 武汉虹信通信技术有限责任公司 | Terminal state tracking method for CBTC |
| CN107894540B (en) * | 2017-10-10 | 2021-08-31 | 郑州市轨道交通有限公司运营分公司 | Portable Beacon Detection Device |
| CN109818690B (en) * | 2019-01-25 | 2021-08-17 | 北京交大思诺科技股份有限公司 | BTM library inspection system based on spectrum analysis technology |
| CN109828171A (en) * | 2019-03-05 | 2019-05-31 | 卢俊文 | Interference measurement system in a kind of train-installed beacon band |
| CN111611219A (en) * | 2020-06-02 | 2020-09-01 | 卡斯柯信号(成都)有限公司 | Intelligent analysis system and method for tramcar logs |
| CN112906501B (en) * | 2021-01-29 | 2023-04-07 | 上海伽易信息技术有限公司 | Non-equilibrium subway train positioning beacon abnormity detection method based on self-adaptive oversampling |
| CN115550219B (en) * | 2021-06-29 | 2024-11-19 | 比亚迪股份有限公司 | Network fault detection method, system, electronic device and storage medium |
| CN115296782B (en) * | 2022-06-14 | 2023-11-07 | 卡斯柯信号有限公司 | FDD frequency division duplex positioning simulation device and method for TACS system |
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| CN101242194B (en) * | 2007-08-30 | 2011-05-25 | 株洲南车时代电气股份有限公司 | Digital demodulation device applied to CTCS standard point responder |
| WO2011096568A1 (en) * | 2010-02-08 | 2011-08-11 | 三菱電機株式会社 | Onboard transponder device and method of confirming soundness thereof |
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