CN110784847A - Crossing early warning device and method for decoding received early warning information - Google Patents
Crossing early warning device and method for decoding received early warning information Download PDFInfo
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- H—ELECTRICITY
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L29/00—Safety means for rail/road crossing traffic
- B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
- B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
- B61L29/32—Timing, e.g. advance warning of approaching train
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- H—ELECTRICITY
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Abstract
The invention provides a crossing early warning device and a decoding method for receiving early warning information thereof, wherein the crossing early warning device comprises a main control unit, a main/standby digital channel machine unit, a radio frequency signal detection unit, a clock unit, a storage unit, an Ethernet interface unit, a USB interface unit, a key display unit and an audio power amplification unit, wherein the main/standby digital channel machine unit is electrically connected with the main control unit and is in signal connection with the main control unit; the main/standby digital channel unit sends or receives crossing fault alarm data, outputs POCSAG code data after processing, and the main control unit receives the POCSAG code data and performs software decoding; the main control unit generates simulated train approaching early warning information data and sends the simulated train approaching early warning information data to the main/standby digital channel machine unit, and the main/standby digital channel machine unit modulates and wirelessly sends the simulated train approaching early warning information data. The invention adopts the main/standby digital channel machine to receive the train approaching early warning information and demodulates the POCSAG code data, thereby effectively improving the decoding capability of the crossing early warning equipment in the low signal-to-noise ratio environment.
Description
Technical Field
The invention relates to the technical field of railway crossing early warning, in particular to a crossing early warning device and a method for decoding received early warning information.
Background
The railway crossing safety problem is an important link of railway transportation safety, and the railway crossing early warning equipment is a safety protection facility arranged at the intersection of a railway and a highway plane and is important equipment for ensuring that railway trains, road vehicles and pedestrians can safely pass through the crossing. Along with the development of times, the number of railway crossings along the railway is more and more, and the safety protection problem is increasingly prominent.
The method is simple to apply, but has high error rate in a low noise ratio environment, low equipment communication reliability and low anti-interference capability, and has potential safety hazards of secondary accidents of the crossing caused by untimely receiving of the approaching early warning information.
The traditional crossing early warning equipment adopts the working mode of a single-channel machine, and the self-checking function of the equipment adopts logic self-checking. In the actual application process, the logic self-checking can not truly and effectively reflect the fault condition of the equipment, particularly after the channel machine has a fault, the fault can not be effectively detected, so that the equipment is always in a 'sick' working state, and when an emergency happens, the fault can not effectively work, thereby bringing great potential safety hazard and seriously influencing the running safety of a railway train and the safety of lives and properties of people.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a crossing warning device and a method for decoding received warning information thereof, so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention provides a crossing early warning device, which comprises a main control unit, a main/standby digital channel unit, a radio frequency signal detection unit, a clock unit, a storage unit, an Ethernet interface unit, a USB interface unit, a key display unit, an audio power amplification unit and a power supply unit, wherein the main control unit is used for controlling the main/standby digital channel unit to perform channel switching; the main/standby digital channel machine unit is electrically connected and in signal connection with the main control unit through a UART serial interface and a GPIO interface so as to realize digital communication between the main control unit and the main/standby digital channel machine unit; the radio frequency signal detection unit is electrically connected and in signal connection with the main control unit through a UART serial interface so as to realize data communication between the main control unit and the radio frequency signal detection unit; the radio frequency signal detection unit is in signal connection with the main/standby digital channel unit in an energy coupling mode so as to realize the detection functions of the transmission power and the standing-wave ratio of the main/standby digital channel unit; the clock unit is electrically connected and in signal connection with the main control unit through an I2C serial interface so as to realize data communication between the main control unit and the clock unit; the storage unit is electrically connected and in signal connection with the main control unit through the SPI serial interface; the main control unit controls the reading, writing and deleting operations of the storage unit so as to realize the management of communication record and working log record information; the main control unit is electrically connected and in signal connection with the monitoring center through the Ethernet interface unit so as to realize data communication between the main control unit and the monitoring center; the main control unit is electrically connected and in signal connection with the computer through the USB interface unit so as to realize data communication between the main control unit and the computer; the key display unit is electrically connected and in signal connection with the main control unit through a UART serial interface so as to realize the key scanning and display control functions of the touch liquid crystal display screen; the key display unit is electrically connected and in signal connection with the main control unit through the GPIO interface so as to realize the identification of the crossing fault warning key and the self-checking key; the audio power amplifier unit is electrically connected and in signal connection with the main control unit through a UART serial interface so as to start a digital voice memory chip of the audio power amplifier unit, send out warning prompt voice and circularly broadcast the road junction fault warning prompt voice through an audio power amplifier loudspeaker.
By adopting the technical scheme, the train approach early warning signal communication anti-interference capability is improved by adopting a main/standby digital channel machine mode for wireless receiving, the main control unit generates simulated train approach early warning information data, sends the simulated train approach early warning information data to the main/standby digital channel machine unit, and carries out wireless sending through modulation of the digital channel machine, so that the train approach early warning information self-checking function is realized; the radio frequency signal detection unit adopts an energy coupling mode to realize the detection function of the transmitting power and the standing-wave ratio of the main/standby channel machine; the method comprises the steps that an accurate system synchronous clock is provided for crossing early warning equipment through a clock unit; the Ethernet interface unit and the monitoring center realize the functions of remotely monitoring the working state of the equipment, remotely inquiring, setting equipment parameters, reading communication record data stored by the equipment and the like; the USB interface unit is electrically connected with a computer through signals, and the computer can inquire and set equipment parameters, read and delete communication record data and the like stored in the equipment through special software, so that the timely and accurate equipment maintenance function is realized.
As a further description of the crossing early warning device of the present invention, preferably, the main/standby digital channel unit is configured to send or receive crossing fault warning function data, the main/standby digital channel unit outputs POCSAG code data, and the main control unit receives the POCSAG code data and performs software decoding; the main control unit generates simulated train approach early warning information data, the main control unit sends the simulated train approach early warning information data to the main/standby digital channel machine unit, and the main/standby digital channel machine unit modulates and wirelessly sends the simulated train approach early warning information data to realize a self-checking function of receiving train approach early warning information; the main control unit is used for inquiring and setting a channel machine communication channel, transmitting power and receiving threshold parameters of the main/standby digital channel machine unit; and the main control unit is used for controlling the main/standby digital channel machine unit to realize the functions of transmitting starting control, carrier detection and channel machine resetting.
By adopting the technical scheme, the POCSAG code data stream is demodulated from the processed train approaching early warning information received by the main/standby digital channel unit and is finally sent to the main control unit for software decoding, and the method effectively improves the decoding capability of the crossing early warning equipment in the low signal-to-noise environment.
As a further description of the crossing warning device of the present invention, preferably, the main/standby digital channel unit includes a train approach warning signal receiving circuit, a simulated train approach warning signal transmitting circuit, a crossing fault warning communication circuit, a power supply, and other auxiliary circuits; the train approach early warning signal receiving circuit, the simulated train approach early warning signal sending circuit, the crossing fault warning communication circuit, the power supply and other auxiliary circuits are electrically connected with the antenna and in signal connection.
As a further explanation of the crossing early warning device of the present invention, preferably, the train approach early warning signal receiving circuit includes an a/D sampling circuit, a raised cosine digital filter and a carrier synchronization logic module, the main control unit is electrically connected and signal-connected with the carrier synchronization logic module, the carrier synchronization logic module is electrically connected and signal-connected with the raised cosine digital filter, the raised cosine digital filter is electrically connected and signal-connected with the a/D sampling circuit, and the a/D sampling circuit is electrically connected and signal-connected with the antenna; the A/D sampling circuit is used for sampling the wireless carrier signals at equal intervals; the raised cosine digital filter is used for extracting carrier signals without distortion; the carrier synchronization logic module is used for demodulating a carrier signal according to the pilot frequency, demodulating POCSAG code data by using a coherent demodulation method, and sending the POCSAG code data to the main control unit for decoding.
By adopting the technical scheme, the A/D sampling circuit adopts the high-speed ADC chip and the auxiliary circuit thereof to realize equal-interval sampling of wireless carrier signals, and based on the high-speed digital processing technology of the FPGA chip, a raised cosine digital filter algorithm matched with a sending end is adopted to realize a channel selection function, realize undistorted extraction of the carrier signals and reduction of data processing speed, and simultaneously reject data on an unused channel, only process data on a useful channel, so that the resource utilization rate of the FPGA is effectively improved, the working efficiency of a channel machine is improved, and the signal receiving anti-interference capability is improved.
As a further explanation of the crossing early warning device of the present invention, preferably, the simulated train approach early warning signal sending circuit includes a carrier synchronization modulation circuit, a raised cosine digital filter and a radio frequency transmitting circuit, the main control unit is electrically connected and signal-connected with the carrier synchronization modulation circuit, the carrier synchronization modulation circuit is electrically connected and signal-connected with the raised cosine digital filter, and the raised cosine digital filter is electrically connected and signal-connected with the radio frequency transmitting circuit; the main control unit generates a train approaching early warning test signal POCSAG code data, and sends the signal to the carrier synchronous modulation circuit; the carrier synchronous modulation circuit modulates the signal to a carrier, and the carrier synchronous modulation circuit sends the carrier to a raised cosine digital filter; the raised cosine digital filter generates a raised cosine roll-off baseband molding pulse signal, and the raised cosine digital filter sends the pulse signal to the wireless radio frequency transmitting circuit; the wireless radio frequency transmitting circuit carries out DAC conversion on the pulse signal and then carries out wireless transmission.
By adopting the technical scheme, the main control unit generates the POCSAG code data of the train approaching early warning test signal and sends the POCSAG code data to the carrier synchronous modulation circuit to modulate the signal onto the carrier. The carrier synchronous modulation circuit adopts a pilot frequency method, namely, a pilot frequency signal is inserted into a carrier and then is sent to a raised cosine filter circuit, a raised cosine roll-off baseband forming pulse signal is generated by utilizing an FPGA chip high-speed data processing technology, then the signal is sent to a wireless radio frequency transmitting circuit for DAC conversion, and finally the signal is wirelessly transmitted through a radio frequency circuit, so that the function of simulating and transmitting train approaching early warning information is realized. The raised cosine digital filter realizes pulse forming filtering on the baseband signal so as to limit the bandwidth of the transmitted signal and reduce out-of-band interference.
As a further description of the crossing warning device of the present invention, preferably, the crossing fault warning communication circuit includes a signaling control unit, a baseband modulation and demodulation unit, and a radio frequency transceiver unit, the signaling control unit is electrically connected and signal-connected with the baseband modulation and demodulation unit, the baseband modulation and demodulation unit is electrically connected and signal-connected with the radio frequency transceiver unit, and the signaling control unit and the radio frequency transceiver unit are respectively electrically connected and signal-connected with the main control unit through a channel machine secondary development interface; the main control unit communicates with the signaling control unit and exchanges crossing alarm communication data, the signaling control unit communicates with the baseband modulation and demodulation unit to perform 4FSK modulation and demodulation on the crossing alarm communication data, the baseband modulation and demodulation unit communicates with the wireless radio frequency transceiving unit through 4FSK signals, when the wireless radio frequency transceiving unit transmits, the baseband modulation and demodulation unit modulates the 4FSK signals onto a carrier, and when the wireless radio frequency transceiving unit receives, the baseband modulation and demodulation unit demodulates the 4FSK signals from the carrier signals; the main control unit is communicated with the wireless radio frequency transceiving unit so as to realize the query and the setting of the main control unit to the transmitting power and the receiving threshold parameter of the channel machine.
As a further description of the crossing warning device of the present invention, preferably, the power supply unit uses an AC220V power supply, and supplies +13.8V working voltage to each unit through a regulated power supply module from AC220V to DC13.8V, the main/backup channel unit uses +13.8V voltage supplied by the main control unit, and the +13.8V voltage generates stable +3.3V voltage after being converted from DC13.8V to DC3.3V, so as to supply stable and reliable working voltage to each chip circuit of the channel unit.
In order to achieve another object of the present invention, the present invention further provides a method for decoding early warning information received by the crossing early warning device, wherein the method for decoding early warning information received by the crossing early warning device comprises the following steps: step S1): the main/standby digital channel unit receives train approaching early warning signals; step S2): the A/D sampling circuit of the main/standby digital channel unit samples train approaching early warning signals at equal intervals; step S3): a raised cosine digital filter of the main/standby digital channel unit carries out channel filtering on the train approaching early warning signal; step S4): a carrier synchronization logic module of the main/standby digital channel unit demodulates the train approaching early warning signal into a POCSAG code signal; step S5): the main control unit performs software decoding on the POCSAG code signal.
As a further description of the decoding method for receiving the early warning information, preferably, the main/standby digital channel unit includes a main channel unit and a standby channel unit, when the main channel unit fails, the standby channel unit will automatically replace the main channel unit to continue working, and the main control unit sends out the device failure warning information to the monitoring center through a wired network electrically connected to the ethernet interface and in signal connection.
The invention has the following beneficial effects:
1. the invention adopts the digital channel machine to carry out wireless receiving, thereby improving the anti-interference capability of the train approaching early warning signal communication. When the digital channel machine receives the train approach early warning signal, the high-speed ADC chip circuit is adopted to sample the carrier frequency at equal intervals, then the carrier frequency is subjected to channel filtering by the FIR raised cosine filter, the carrier frequency is sent to the carrier synchronization logic module to demodulate a POCSAG code signal, and finally the POCSAG code signal is sent to the main control unit to be subjected to software decoding, so that the accuracy of the crossing early warning equipment for receiving the train approach early warning signal in the low signal-to-noise ratio environment is effectively improved.
2. The invention adopts a mode of a main/standby digital channel machine to carry out wireless receiving, when the main channel machine fails, the standby channel machine automatically replaces the main channel machine to continue working, and sends out alarm information to a monitoring center through a wired network, thereby realizing the effect of weakening the failure of the channel machine on the normal working of the equipment, and realizing the self-checking functions of the equipment such as self-receiving POCSAG codes and the like through mutual communication of the two channel machines, and ensuring that the equipment is in a good working state when working; the communication between the crossing early warning equipment and the monitoring center is realized through the Ethernet, the monitoring and the management of the equipment are realized, the timely elimination of equipment faults is realized, and the normal work of the equipment is ensured.
3. The invention improves the master and standby receiving mode and the decoding method of the train approach early warning information, effectively improves the anti-interference capability of the train approach early warning information communication and the reliability of the equipment operation, effectively prevents secondary accidents at the crossing and ensures the train operation safety.
Drawings
Fig. 1 is a schematic diagram of the crossing warning device according to the present invention;
FIG. 2 is a schematic diagram of the components of the main/standby digital channel unit of the present invention;
FIG. 3 is a schematic diagram of the electrical and signal connections of the train approach warning signal receiving circuit of the present invention;
FIG. 4 is a schematic diagram of the electrical and signal connections of the simulated train approach warning signal transmission circuit of the present invention;
fig. 5 is a schematic diagram of the electrical and signal connections of the crossing fault alert communication circuit of the present invention;
fig. 6 is a schematic flow chart of a method for decoding the received warning information of the crossing warning device according to the present invention.
Detailed Description
To further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solutions of the present invention and are not to limit the present invention.
As shown in fig. 1, a crossing warning device includes a main control unit 1, a main/standby digital channel unit 2, a radio frequency signal detection unit 3, a clock unit 4, a storage unit 5, an ethernet interface unit 6, a USB interface unit 7, a key display unit 8, an audio power amplifier unit 9, and a power supply unit 10.
The main control unit 1 is a main data processing unit of the gateway early warning device and a hub for data interaction of each unit, and is responsible for communicating with each component unit according to a specified protocol, analyzing and processing voice and data information transmitted by a communication link, controlling each component unit to work according to functional requirements, and responding to key operation in time.
The MCU in the main control unit 1 is constructed by adopting an ARM Cortex-A8 kernel microprocessor, and a Linux operating system is realized on the hardware platform and supports functions of a RAM space with 512M bytes, a FLASH space with 1G bytes, a CAN bus controller, an IIC controller, an LCD controller, a Power VR SGX530 graphics processor, a plurality of UART serial ports and the like.
The main/standby digital channel machine unit 2 is electrically connected and in signal connection with the main control unit 1 through a UART serial interface so as to realize the digital communication between the main control unit 1 and the main/standby digital channel machine unit 2 and realize the sending and receiving of crossing fault warning function data; the inquiry and setting of parameters such as the communication channel, the transmitting power, the receiving threshold and the like of the channel machine are realized.
The main/standby digital channel machine unit 2 is electrically connected and in signal connection with the main control unit 1 through a GPIO interface, so that the functions of the main control unit 1 such as starting control of channel machine emission, carrier detection, channel machine reset and the like are realized. The main/standby digital channel machine unit 2 is used for sending or receiving crossing fault alarm function data, the main/standby digital channel machine unit 2 outputs POCSAG code data, the main control unit 1 receives the POCSAG code data and performs software decoding, so that the functions of receiving the POCSAG code data output by the digital channel machine and decoding the software of the main control unit 1 are realized. The main control unit 1 generates simulated train approach early warning information data, the main control unit 1 sends the simulated train approach early warning information data to the main/standby digital channel machine unit 2, and the main/standby digital channel machine unit 2 modulates and wirelessly sends the simulated train approach early warning information data to realize a self-checking function of receiving train approach early warning information;
the main control unit 1 is used for inquiring and setting a channel machine communication channel, transmitting power and receiving threshold parameters of the main/standby digital channel machine unit 2; and the main control unit 1 is used for controlling the main/standby digital channel unit 2 to realize the functions of transmitting starting control, carrier detection and channel unit resetting. The main control unit 1 adopts a timer to sample the POCSAG code data at regular time, obtains train approaching early warning information through high-speed MCU analysis, then sends the information to the storage unit 5 for storage, and sends the information to the key display unit 8 for display.
The radio frequency signal detection unit 3 is electrically connected and in signal connection with the main control unit 1 through a UART serial interface so as to realize data communication between the main control unit 1 and the radio frequency signal detection unit 3; the radio frequency signal detection unit 3 is in signal connection with the main/standby digital channel unit 2 in an energy coupling mode to realize the detection functions of the transmission power and the standing-wave ratio of the main/standby digital channel unit 2, and the energy coupling is a short-distance wireless microwave induction communication mode.
The clock unit 4 is electrically connected and in signal connection with the main control unit 1 through an I2C serial interface so as to realize data communication between the main control unit 1 and the clock unit 4; the clock unit 4 adopts a high-precision clock chip integrated with an RTC/TCXO crystal, and combines a button battery with the capacity of 70mA/H to realize the clock requirement of 2 years (730 days). And time information in the GPS positioning information is adopted to calibrate time in real time, so that an accurate system synchronization clock is provided for the crossing early warning equipment.
The storage unit 5 is electrically connected and in signal connection with the main control unit 1 through an SPI serial interface; the main control unit 1 controls reading, writing and deleting operations to the storage unit 5 to realize management of communication record and work log record information.
The main control unit 1 is electrically connected and in signal connection with the monitoring center through the ethernet interface unit 6, so as to realize data communication between the main control unit 1 and the monitoring center, realize monitoring and management of the crossing early warning device by the monitoring center, and realize query and download operations of the communication records, working logs and the like stored in the device by the monitoring center.
The main control unit 1 is electrically connected and in signal connection with a computer through a USB interface unit 7 so as to realize data communication between the main control unit 1 and the computer, realize the parameter query and setting of the crossing early warning equipment by computer special software, and realize the query and download functions of information such as communication records, work logs and the like of the equipment storage unit.
The key display unit 8 is electrically connected and in signal connection with the main control unit 1 through a UART serial interface so as to realize the key scanning and display control functions of the touch liquid crystal display screen, realize the query and setting of kilometer posts at the position of the equipment and corresponding train approaching early warning distance parameters, realize the query and setting of parameters of the local machine and realize the display of train approaching early warning information and crossing fault warning channels; the key display unit 8 is electrically connected and in signal connection with the main control unit 1 through a GPIO interface to realize identification of a crossing fault warning key, start warning information transmission, realize identification of a self-checking key, start a self-checking function, realize detection of channel machine performance indexes such as main/standby channel machine transmission power, standing-wave ratio and the like, realize self-checking of a receiving train approaching early warning information function and realize self-checking of a crossing fault warning function.
The audio power amplifier unit 9 is electrically connected and signal-connected with the main control unit 1 through a UART serial interface to realize starting the digital voice memory chip of the audio power amplifier unit 9, sending out warning prompt voice and circularly broadcasting the warning prompt voice of the road junction fault through the audio power amplifier loudspeaker.
The power supply unit 10 adopts an alternating current 220V power supply, +13.8V working voltage is provided for each unit through a stabilized voltage supply module which is converted from AC220V to DC13.8V, the main/standby channel machine unit adopts +13.8V voltage provided by the main control unit 1, and the +13.8V voltage is converted into DC3.3V stabilized voltage supply module through DC13.8V to generate stable +3.3V voltage, so that stable and reliable working voltage is provided for each chip circuit of the channel machine.
As shown in fig. 2, the main/standby digital channel unit 2 includes a train approach warning signal receiving circuit 21, an analog train approach warning signal transmitting circuit 22, a crossing fault warning communication circuit 23, and a power supply and other auxiliary circuit 24; the train approach early warning signal receiving circuit 21, the simulated train approach early warning signal transmitting circuit 22, the crossing fault warning communication circuit 23 and the power supply and other auxiliary circuits 24 are electrically connected with the antenna and in signal connection. The crossing early warning equipment adopts a main/standby digital channel machine mode to realize hot backup of the channel machine, and realizes the decoding self-checking function of the received train approaching early warning information, the crossing fault warning self-checking function and the like through mutual communication of the main/standby channel machines.
As shown in fig. 3, the train approach warning signal receiving circuit 21 includes an a/D sampling circuit 201, a raised cosine digital filter 202 and a carrier synchronization logic module 203, the main control unit 1 is electrically connected and signal-connected with the carrier synchronization logic module 203, the carrier synchronization logic module 203 is electrically connected and signal-connected with the raised cosine digital filter 202, the raised cosine digital filter 202 is electrically connected and signal-connected with the a/D sampling circuit 201, and the a/D sampling circuit 211 is electrically connected and signal-connected with an antenna; the a/D sampling circuit 201 is configured to sample the wireless carrier signal at equal intervals; the raised cosine digital filter 202 is used for extracting carrier signals without distortion; the carrier synchronization logic module 203 is configured to demodulate a carrier signal according to the pilot, demodulate POCSAG code data by using a coherent demodulation method, and send the POCSAG code data to the main control unit 1 for decoding. The A/D sampling circuit adopts a high-speed ADC chip and an auxiliary circuit thereof to realize equal-interval sampling of wireless carrier signals. Based on the high-speed digital processing technology of the FPGA chip, a raised cosine digital filter algorithm matched with a sending end is adopted to realize a channel selection function, distortion-free extraction of carrier signals is realized, the data processing speed is reduced, meanwhile, data on an unused channel are eliminated, only data on a useful channel are processed, the resource utilization rate of the FPGA is effectively improved, the working efficiency of a channel machine is improved, and the signal receiving anti-interference capability is improved.
As shown in fig. 4, the simulated train approach early warning signal sending circuit 22 includes a carrier synchronization modulation circuit 204, a raised cosine digital filter 202 and a radio frequency transmitting circuit 205, the main control unit 1 is electrically connected and signal-connected with the carrier synchronization modulation circuit 204, the carrier synchronization modulation circuit 204 is electrically connected and signal-connected with the raised cosine digital filter 202, and the raised cosine digital filter 202 is electrically connected and signal-connected with the radio frequency transmitting circuit 205; the main control unit 1 generates a train approaching early warning test signal POCSAG code data, and the main control unit 1 sends the signal to the carrier synchronous modulation circuit 204; the carrier synchronous modulation circuit 204 modulates the signal onto a carrier by adopting a pilot frequency method, and the carrier synchronous modulation circuit 204 sends the carrier to the raised cosine digital filter 202; the raised cosine digital filter 202 generates a raised cosine roll-off baseband forming pulse signal by using an FPGA chip high-speed data processing technology, and the raised cosine digital filter 202 sends the pulse signal to the radio frequency transmitting circuit 205; the wireless radio frequency transmitting circuit 205 performs DAC conversion on the pulse signal and then performs wireless transmission, so as to realize the function of analog transmission of train approach warning information.
h (t) the raised cosine function is as follows:
T
Cfor the period of the input pulse signal, α is a roll-off coefficient, 0 is more than or equal to α is more than or equal to 1, the roll-off coefficient α is smaller, the frequency spectrum is steeper at the cut-off frequency, namely, the frequency spectrum efficiency is higher.
As shown in fig. 5, the crossing fault warning communication circuit 23 includes a signaling control unit 206, a baseband modulation and demodulation unit 207, and a radio frequency transceiver unit 208, where the signaling control unit 206 is electrically connected and signal-connected with the baseband modulation and demodulation unit 207, the baseband modulation and demodulation unit 207 is electrically connected and signal-connected with the radio frequency transceiver unit 208, and the signaling control unit 206 and the radio frequency transceiver unit 208 are respectively electrically connected and signal-connected with the main control unit 1 through a channel machine secondary development interface; based on UART serial data communication, the main control unit 1 communicates with the signaling control unit 206 and exchanges crossing alarm communication data to implement data communication of functions such as crossing fault alarm; based on UART serial data communication, the signaling control unit 206 communicates with the baseband modem unit 207 to perform 4FSK modem on crossing alert communication data; based on the audio interface, the baseband modulation and demodulation unit 207 communicates with the radio frequency transceiver unit 208 through a 4FSK signal, when the radio frequency transceiver unit 208 transmits, the baseband modulation and demodulation unit 207 modulates the 4FSK signal onto a carrier, and when the radio frequency transceiver unit 208 receives, the baseband modulation and demodulation unit 207 demodulates the 4FSK signal from the carrier signal; based on UART serial data communication, the main control unit 1 communicates with the wireless radio frequency transceiver unit 208 to realize the query and setting of the main control unit 1 to the transmitting power and receiving threshold parameters of the channel machine; and based on the GPIO interface, the main control unit 1 controls the emission start of the channel machine.
As shown in fig. 6, in a method for decoding received early warning information by using the crossing early warning device, a main/standby digital channel unit 2 wirelessly receives a train approaching early warning signal, first, an a/D sampling circuit 201 of the main/standby digital channel unit 2 samples the train approaching early warning signal at equal intervals, and then sends the train approaching early warning signal to a raised cosine digital filter 202, and the train approaching early warning signal is subjected to channel filtering by the raised cosine digital filter 202 of the main/standby digital channel unit 2 and then sent to a carrier synchronization logic module 203; the carrier synchronization logic module 203 of the main/standby digital channel unit 2 demodulates the train approach early warning signal into a POCSAG code signal, and finally sends the POCSAG code signal to the main control unit 1, and the main control unit 1 performs software decoding on the POCSAG code signal, so that the accuracy of receiving the train approach early warning signal by the crossing early warning equipment in a low signal-to-noise ratio environment is effectively improved.
The decoding method for receiving the early warning information adopts a main/standby digital channel machine mode to carry out wireless receiving, the main/standby digital channel machine unit 2 comprises a main channel machine and a standby channel machine, when the main channel machine fails, the standby channel machine automatically replaces the main channel machine to continuously work, the main control unit 1 sends equipment failure warning information to a monitoring center through a wired network which is electrically connected with an Ethernet interface and is in signal connection, the influence of the channel machine failure on the normal work of the equipment is weakened, the two channel machines can carry out mutual communication, the self-checking functions of self-receiving POCSAG codes and the like of the equipment are realized, the equipment is in a good working state when working, secondary accidents at a crossing are effectively prevented, and the running safety of a train is ensured.
Train approaching early warning function
1) Receiving train approaching warning information, including train number, speed and kilometer sign.
2) Judging the train running direction: and judging the up-down direction of the train according to the rule of the change of the kilometer sign data of the train approaching early warning information. The ascending direction train is when the kilometer sign changes from big to small, and the descending direction train is when the kilometer sign changes from small to big. And when the change trend of the kilometer post cannot be confirmed, judging the uplink and downlink directions of the train according to the function code of the train approaching warning information, wherein the function code is the uplink direction train when being 11, and the function code is the downlink direction train when being 01.
3) And calculating the absolute value of the difference between the kilometer posts set by the kilometer post same-lane early warning equipment of the train approaching early warning information, and broadcasting voice and displaying the train number, distance and duration when the absolute value is smaller than the set early warning distance and changes from large to small.
4) And when the train number received from the train approaching early warning information is valid but the kilometer post is invalid (the kilometer post data is 'D'), broadcasting voice and displaying the train number.
5) And calculating the difference absolute value of the kilometer posts set by the kilometer post same-road-port early warning equipment of the train approaching early warning information according to the train approaching early warning information. The absolute value changes from small to large, and the broadcasting of voice and the emptying of display information are stopped.
6) When the train number in the received train approaching warning information is valid but the kilometer post is invalid (the kilometer post data is 'D'), the 30S does not receive the same train approaching warning information, and stops broadcasting voice and emptying the display information.
7) The device can set the kilometer post at the position and the corresponding train approaching early warning distance parameter.
The working principle of the crossing early warning equipment is as follows:
crossing fault warning function
When the crossing warning key is pressed down, the crossing warning equipment sends crossing warning information (including crossing kilometer posts) and can send out acousto-optic prompts. And pressing the alarm key again to stop sending the crossing alarm information and stop acousto-optic prompt.
Self-checking function
When the self-checking button is pressed or the equipment is powered on, the self-checking function of the crossing early warning equipment is started. The self-checking function comprises starting the channel machine to transmit, and detecting the channel machine performances such as the transmitting power of the wireless receiving/transmitting unit, the antenna feeder system standing-wave ratio and the like through the radio frequency signal detecting unit. The train approach early warning signal is sent in a simulated mode through mutual communication of the main channel machine and the standby channel machine, and detection of a train approach early warning information receiving function is achieved; and sending the road junction fault alarm test information to realize the detection of the road junction protection alarm information sending function.
Remote monitoring function
The communication between the crossing early warning equipment and the monitoring center is realized through Ethernet electric connection and signal connection, the real-time monitoring function of the monitoring center on the crossing early warning equipment is realized, and the fault warning information of the crossing early warning equipment is received in time; the functions of parameter query and setting of the crossing early warning equipment by the monitoring center are realized; the functions of inquiring and downloading data such as communication records, working logs and the like stored in the equipment by the monitoring center are realized.
Computer reading communication record function
Through the USB interface, the data communication function between the crossing early warning equipment and the computer is realized, the parameter query and setting of the crossing early warning equipment by computer special software are realized, and the query and downloading function of data such as communication records, work logs and the like stored by the equipment is realized.
It should be noted that the above summary and the detailed description are intended to demonstrate the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent substitutions, or improvements may be made by those skilled in the art within the spirit and principles of the invention. The scope of the invention is to be determined by the appended claims.
Claims (9)
1. The crossing early warning device is characterized by comprising a main control unit (1), a main/standby digital channel unit (2), a radio frequency signal detection unit (3), a clock unit (4), a storage unit (5), an Ethernet interface unit (6), a USB interface unit (7), a key display unit (8), an audio power amplifier unit (9) and a power supply unit (10); wherein the content of the first and second substances,
the main/standby digital channel machine unit (2) is electrically connected and in signal connection with the main control unit (1) through a UART serial interface and a GPIO interface so as to realize the digital communication between the main control unit (1) and the main/standby digital channel machine unit (2);
the radio frequency signal detection unit (3) is electrically connected and in signal connection with the main control unit (1) through a UART serial interface so as to realize data communication between the main control unit (1) and the radio frequency signal detection unit (3); the radio frequency signal detection unit (3) is in signal connection with the main/standby digital channel unit (2) in an energy coupling mode so as to realize the detection functions of the transmission power and the standing-wave ratio of the main/standby digital channel unit (2);
the clock unit (4) is electrically connected and in signal connection with the main control unit (1) through an I2C serial interface so as to realize data communication between the main control unit (1) and the clock unit (4);
the storage unit (5) is electrically connected and in signal connection with the main control unit (1) through an SPI serial interface; the main control unit (1) controls reading, writing and deleting operations of the storage unit (5) so as to realize management of communication record and working log record information;
the main control unit (1) is electrically connected and in signal connection with the monitoring center through the Ethernet interface unit (6) so as to realize data communication between the main control unit (1) and the monitoring center;
the main control unit (1) is electrically connected and in signal connection with a computer through a USB interface unit (7) so as to realize data communication between the main control unit (1) and the computer;
the key display unit (8) is electrically connected and in signal connection with the main control unit (1) through a UART serial interface so as to realize the key scanning and display control functions of the touch liquid crystal display screen; the key display unit (8) is electrically connected and in signal connection with the main control unit (1) through a GPIO interface so as to realize the identification of a crossing fault warning key and a self-checking key;
the audio power amplifier unit (9) is electrically connected and in signal connection with the main control unit (1) through a UART serial interface so as to start a digital voice memory chip of the audio power amplifier unit (9), send out alarm prompt voice and circularly broadcast the road junction fault alarm prompt voice through an audio power amplifier loudspeaker.
2. The crossing warning apparatus of claim 1,
the main/standby digital channel unit (2) is used for sending or receiving crossing fault alarm function data, the main/standby digital channel unit (2) outputs POCSAG code data, and the main control unit (1) receives the POCSAG code data and performs software decoding; the main control unit (1) generates simulated train approach early warning information data, the main control unit (1) sends the simulated train approach early warning information data to the main/standby digital channel machine unit (2), and the main/standby digital channel machine unit (2) modulates and wirelessly sends the simulated train approach early warning information data to realize a train approach early warning information receiving self-checking function;
the main control unit (1) is used for inquiring and setting a channel machine communication channel, transmitting power and receiving threshold parameters of the main/standby digital channel machine unit (2); and the main control unit (1) is used for controlling the main/standby digital channel machine unit (2) to realize the functions of transmitting starting control, carrier detection and channel machine resetting.
3. The crossing warning device according to claim 1, wherein the main/standby digital channel unit (2) includes a train approach warning signal receiving circuit (21), a simulated train approach warning signal transmitting circuit (22), a crossing fault warning communication circuit (23), a power supply and other auxiliary circuits (24); the train approach early warning signal receiving circuit (21), the simulated train approach early warning signal transmitting circuit (22), the crossing fault warning communication circuit (23) and the power supply and other auxiliary circuits (24) are electrically connected with the antenna and in signal connection.
4. The crossing warning apparatus of claim 3,
the train approaching early warning signal receiving circuit (21) comprises an A/D sampling circuit (201), a raised cosine digital filter (202) and a carrier synchronization logic module (203), the main control unit (1) is electrically connected and in signal connection with the carrier synchronization logic module (203), the carrier synchronization logic module (203) is electrically connected and in signal connection with the raised cosine digital filter (202), the raised cosine digital filter (202) is electrically connected and in signal connection with the A/D sampling circuit (201), and the A/D sampling circuit (211) is electrically connected and in signal connection with an antenna;
the A/D sampling circuit (201) is used for sampling the wireless carrier signal at equal intervals; the raised cosine digital filter (202) is used for extracting the carrier signal without distortion; the carrier synchronization logic module (203) is used for demodulating a carrier signal according to the pilot frequency, demodulating POCSAG code data by using a coherent demodulation method, and sending the POCSAG code data to the main control unit (1) for decoding.
5. The crossing warning apparatus of claim 3,
the simulated train approach early warning signal sending circuit (22) comprises a carrier synchronous modulation circuit (204), a raised cosine digital filter (202) and a radio frequency transmitting circuit (205), the main control unit (1) is electrically connected and in signal connection with the carrier synchronous modulation circuit (204), the carrier synchronous modulation circuit (204) is electrically connected and in signal connection with the raised cosine digital filter (202), and the raised cosine digital filter (202) is electrically connected and in signal connection with the radio frequency transmitting circuit (205);
the train approaching early warning test system comprises a main control unit (1), a carrier synchronous modulation circuit (204), a train approaching early warning test signal POCSAG code data and a train approaching early warning test signal POCSAG signal, wherein the main control unit (1) generates the train approaching early warning test signal POCSAG code data and sends the signal to the carrier synchronous modulation circuit (204); the carrier synchronous modulation circuit (204) modulates the signal to a carrier, and the carrier synchronous modulation circuit (204) transmits the carrier to the raised cosine digital filter (202); the raised cosine digital filter (202) generates a raised cosine roll-off baseband molding pulse signal, and the raised cosine digital filter (202) sends the pulse signal to the radio frequency transmitting circuit (205); the wireless radio frequency transmitting circuit (205) carries out DAC conversion on the pulse signal and then carries out wireless transmission.
6. The crossing warning apparatus of claim 3,
the crossing fault warning communication circuit (23) comprises a signaling control unit (206), a baseband modulation and demodulation unit (207) and a wireless radio frequency transceiving unit (208), wherein the signaling control unit (206) is electrically connected and in signal connection with the baseband modulation and demodulation unit (207), the baseband modulation and demodulation unit (207) is electrically connected and in signal connection with the wireless radio frequency transceiving unit (208), and the signaling control unit (206) and the wireless radio frequency transceiving unit (208) are respectively electrically connected and in signal connection with the main control unit (1) through a channel machine secondary development interface;
the main control unit (1) communicates with the signaling control unit (206) and exchanges crossing alarm communication data, the signaling control unit (206) communicates with the baseband modulation and demodulation unit (207) to perform 4FSK modulation and demodulation on the crossing alarm communication data, the baseband modulation and demodulation unit (207) communicates with the wireless radio frequency transceiving unit (208) through 4FSK signals, when the wireless radio frequency transceiving unit (208) transmits, the baseband modulation and demodulation unit (207) modulates the 4FSK signals onto a carrier, and when the wireless radio frequency transceiving unit (208) receives, the baseband modulation and demodulation unit (207) demodulates the 4FSK signals from the carrier signals; the main control unit (1) is communicated with the wireless radio frequency transceiving unit (208) so as to realize the query and the setting of the main control unit (1) to the transmitting power and the receiving threshold parameter of the channel machine.
7. The crossing warning device according to claim 1, wherein the power supply unit (10) uses an AC220V power supply, and supplies +13.8V operating voltage to each unit through an AC 220V-DC13.8V voltage-stabilized power supply module, the main/backup channel unit uses +13.8V voltage supplied by the main control unit (1), and the +13.8V voltage generates stable +3.3V voltage after passing through a DC13.8V-DC3.3V voltage-stabilized power supply module, so as to supply stable and reliable operating voltage to each chip circuit of the channel unit.
8. A receiving and warning information decoding method using the crossing warning apparatus according to any one of claims 1 to 7, wherein the receiving and warning information decoding method comprises the steps of:
step S1): the main/standby digital channel unit (2) receives train approach early warning signals;
step S2): an A/D sampling circuit (201) of a main/standby digital channel unit (2) samples train approaching early warning signals at equal intervals;
step S3): a raised cosine digital filter (202) of the main/standby digital channel unit (2) carries out channel filtering on the train approaching early warning signal;
step S4): a carrier synchronization logic module (203) of the main/standby digital channel unit (2) demodulates the train approaching early warning signal into a POCSAG code signal;
step S5): the main control unit (1) performs software decoding on the POCSAG code signal.
9. The decoding method for receiving early warning information according to claim 8, wherein the main/standby digital channel unit (2) comprises a main channel unit and a standby channel unit, when the main channel unit fails, the standby channel unit will automatically replace the main channel unit to continue working, and the main control unit (1) sends out device failure warning information to the monitoring center through a wired network electrically connected with the ethernet interface and in signal connection.
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