CN113163170B - System and method for superposing rail temperature, beam temperature state temperature and video of high-speed railway - Google Patents
System and method for superposing rail temperature, beam temperature state temperature and video of high-speed railway Download PDFInfo
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Abstract
The invention discloses a system and a method for superposing rail temperature, beam temperature state temperature and video of a high-speed railway, which are suitable for high-speed railways. Firstly, measuring the rail temperature and the beam temperature by using a wireless temperature sensor, and storing temperature information in a character storage module through wireless to finish serial port communication between the character storage module and a video character superposition module; using a monitoring camera, separating a synchronous signal into a line synchronous signal and a field synchronous signal by using a synchronous signal separation circuit, amplifying a video signal by using an amplification buffer circuit, and transmitting a real-time picture to a video character superposition module; and the video character superposition module is used for finishing superposition of character videos, superposing the character information controlled by the character storage module with a real-time video, and transmitting the video and the character superposition to the display module for superposition display. The method is based on the superposition of digital signals, has flexible superposition effect, strong programmability and expansibility, and can realize more precise superposition control according to product requirements.
Description
Technical Field
The invention relates to a system and a method for superposing state temperature and video, in particular to a system and a method for superposing the state temperature and the video of high-speed railway rail temperature and beam temperature on a high-speed railway.
Background
The Chinese high-speed rail is an important component of the transportation industry of China, plays a very important role in promoting the development of Chinese industrialization and urbanization, and represents the advanced technological level of China.
The high-speed railway requires that the line has the characteristics of high smoothness, high precision, less maintenance, small residual change and the like, and the temperature function is one of main factors influencing the high smoothness and stability of the box girder-track system of the high-speed railway. The infrastructure temperature is an important factor for determining the stability of a seamless line, the high-speed rail real-time video data and the infrastructure temperature parameters which are rapidly driven are subjected to image superposition and real-time display, a more convenient and effective equipment monitoring means can be provided for an operation maintenance unit, and the method has practical application significance. Therefore, a method for superposing the rail temperature, the beam temperature state temperature and the video of the high-speed railway is needed.
In a novel video anti-counterfeiting circuit board disclosed in patent CN201657208U, video signals are not amplified and buffered, the video signals are interfered by external environment, and there is large impedance, which causes the video signals to be unstable, and it is difficult to form stable superimposed video character signals, on the other hand, the superimposed video character signals have two transmission directions, which greatly affects the transmission efficiency and security; in an unmanned aerial vehicle video overlay system of patent CN110445995A, a software overlay system is mainly adopted, and a character library of a video character overlay module can only recognize ASCII codes generally, the patent does not convert character information to be converted into ASCII code values, on the other hand, software overlay is used, although space is saved, the requirement on the running speed of a host computer is higher, once an error occurs in the running of a program, the error is difficult to find, and the repair process affects the running safety of a train, which is far less than the safety and adaptability of the combination of a hardware system and the program.
Disclosure of Invention
Aiming at the defects of the technology, the system and the method for superposing the rail temperature, the beam temperature state temperature and the video of the high-speed railway are provided, wherein the system and the method are stable in transmission signal, high in transmission efficiency, high in reliability and high in adaptability.
In order to achieve the technical purpose, the high-speed railway rail temperature and beam temperature state temperature and video superposition system comprises a high-speed railway running real-time monitoring camera, a video amplification buffer circuit, a beam temperature sensor, a rail temperature sensor, a wireless receiving host, a switching signal generator, a synchronous signal separation circuit, a character storage module, a video character superposition module and a display module; the high-speed rail driving real-time monitoring camera is arranged on a high-speed rail vehicle head and used for collecting position information of a fixed vehicle body of the high-speed rail. The video signal of the high-speed rail running real-time monitoring camera is connected with a receiving end of a video character superposition module through a video amplification buffer circuit, a field synchronizing signal and a line synchronizing signal are separated from one path of analog video signal of real-time monitoring video of the high-speed rail running real-time monitoring camera through a synchronizing signal separation circuit, wherein the line synchronizing signal is directly connected with the receiving end of the video character superposition module, and the field synchronizing signal is connected with the receiving end of the video character superposition module through a switching signal generator; the wireless receiving host is connected with the video character superposition module through the character storage module, the beam temperature sensor is arranged at the head of the train and is only arranged at one position, the rail temperature sensor is arranged on a plurality of rail beams through which a high-speed train passes, the beam temperature sensor and the rail temperature sensor are respectively connected with the wireless receiving host through wireless signals and send beam temperature signals and rail temperature signals to the video character superposition module through the wireless signals, and the video character superposition module superposes the beam temperature signals and the rail temperature signals in videos of the high-speed train running real-time monitoring camera in a character mode and outputs the videos to the display module for display; a real-time monitoring video of one path of the high-speed rail running real-time monitoring camera is separated into a field synchronizing signal and a line synchronizing signal through a synchronizing signal separating circuit, the field synchronizing signal determines the start of one field, and the line synchronizing signal determines the start of one line.
A superposition method of a superposition system of rail temperature, beam temperature state temperature and video of a high-speed railway using rights comprises the following steps: the rail temperature sensor is arranged at the head of a train and is only arranged at one position, the rail temperature sensor is arranged on a plurality of rail beams which the high-speed rail train must pass through, the wireless receiving host receives temperature data information sent by the beam temperature sensor and the rail temperature sensor and transmits the temperature data information to the character storage module for storage, then the data in the character storage module is sent to the video character superposition module to be superposed with image data synchronous with the temperature data, meanwhile, the image data is matched with the video information to update temperature characters, and the character storage module and the video character superposition module are communicated through serial ports; the method comprises the steps that a video synchronization signal separation circuit is used for separating synchronization signals into line synchronization signals and field synchronization signals, a switching signal generator is used for detecting the field synchronization signals, so that whether amplified video signals sent by a high-speed rail running real-time monitoring camera in the rail running process to a video character superposition module through a video amplification buffer circuit are normally transmitted or not is judged, finally, the video character superposition module superposes data synchronously sent by a character storage module and the video signals, and outputs the superposed video to a video display module;
the method comprises the following specific steps:
firstly, respectively measuring the rail temperature and the temperature of the beam temperature in real time by using a beam temperature sensor and a rail temperature sensor, and transmitting temperature data to a wireless receiving host connected with a video character superposition module through a wireless signal;
b, utilizing a high-speed rail running real-time monitoring camera to perform real-time monitoring on the environment in front of the vehicle head at the position where the high-speed rail arrives when running;
c, the wireless receiving host transmits the received temperature data to the character storage module;
d, the character storage module receives and stores the temperature data, and screens and fills the characters of the pre-burned chip into a storage chip of the character storage module under the control of logo word library editing and generating software under the control of a Font Creator Program;
e, the character storage module converts the screened characters into ASCII codes and then sends the ASCII codes to the video character superposition module, and a character library of the video character superposition module converts the received ASCII codes into characters;
step f, a synchronous signal separation circuit separates the analog signal synchronous signal from the real-time monitoring video of the high-speed rail running real-time monitoring camera into a line synchronous signal and a field synchronous signal, wherein the line synchronous signal determines the start of one line of the analog signal of the high-speed rail running real-time monitoring camera, and the field synchronous signal determines the start of one field of the analog signal of the high-speed rail running real-time monitoring camera;
step g, line synchronizing signals are directly transmitted to a video character superposition module, field synchronizing signals are transmitted to the video character superposition module through a switch signal generator, once a high-speed rail running real-time monitoring camera is cut off, a video signal synchronous separation circuit cannot detect the video field synchronizing signals, the video signal synchronous separation circuit transmits abnormal signals to the video character superposition module and stops superposition work of characters and videos, and meanwhile alarm information is sent out until the system continues to work normally after the abnormality is processed;
and h, simultaneously, the video signal passes through an amplification buffer circuit and is used for an amplifier with impedance matching between the input and output of the front and rear stages of the signal, so that the impedance matching effect is achieved, the signal distortion is reduced, and the anti-interference effect is achieved. The video signal is transmitted to a video character superposition module;
and step i, superposing the temperature characters and the video information processed by the video amplification buffer circuit in real time in a video character superposition module in the video character superposition module, and finally inputting the video superposed with the temperature characters into a display module for displaying.
The character storage module is an MD27C512 chip, receives and stores temperature data, screens and fills characters of a chip burned in advance under the control of word stock editing and generating software, and converts character information into ASCII code values.
The types of the beam temperature sensor and the rail temperature sensor are SD123T20 temperature and humidity intelligent wireless sensors, and the rail temperature sensor fixed at the head of the train and the beam temperature sensors fixed on the rail beams at all positions are matched with FSK433MHZ wireless transmission to transmit temperature information to a wireless receiving host computer which is moved to the rail at the position or the rail beam.
The wireless receiving host computer adopts a DTS500 host computer which is arranged on a fast moving high-speed rail, receives temperature information from a wireless temperature sensor, is connected with the character storage module and transmits the temperature information to the character storage module in a wired mode.
The synchronous signal separation circuit adopts an intelligent video separation chip with the model number of LM1881N, the synchronous signal is separated into a line synchronous signal and a field synchronous signal by the video synchronous signal separation circuit, the line synchronous signal determines the start of a line, and the field synchronous signal determines the start of a field.
The video amplification buffer circuit adopts a chip with the model AD812AN, is used for an amplifier with front-stage and rear-stage signal input and output impedance matching, plays a role in impedance matching, reduces signal distortion and is anti-interference.
The switch signal generator is used for detecting whether the video signals are normally transmitted or not, once the real-time monitoring camera is cut off when the high-speed rail runs, the video signal synchronous separation circuit cannot detect the video field synchronous signals, the signals are transmitted to the video superposition module, the superposition of characters and videos is stopped, meanwhile, alarm information is sent out, and normal work is continued after abnormality is processed.
Because the character library of the video character superposition module can only identify ASCII codes, the character information to be converted needs to be converted into ASCII code values, and serial port communication between the character storage module and the video character superposition module is completed through Visual Basi language.
The character storage module controls the display of characters according to the temperature data received by the wireless receiving host, and carries out real-time superposition of images and characters on the video character superposition module together with the processed video signal, the line synchronous signal and the field synchronous signal, wherein, in the superposition main program of the video character superposition module, the judgment that the flag1 is 1? The SEN indicator is turned on to indicate whether data are received from a wireless receiver or not, a timer is used for interrupting for 10ms, whether a character storage module has a receiving event or not is inquired in the interruption of the timer, if the data are received, a receiving flag1 is 1, a RUN lamp is turned on, the received data are recorded, and characters to be superposed are displayed; if the character superimposition is successful, the flag is 1 and the RUN indicator light is normally on, otherwise, if the character superimposition is failed, the flag1 is 0, the video superimposition fails, and the RUN indicator light is not on; and finally, the superposed signals are transmitted to a display module to assist high-speed rail workers to better manage the safe driving of the high-speed rail.
Has the beneficial effects that: the method comprises the following steps of measuring the beam temperature and the rail temperature on the high-speed railway by using a wireless temperature sensor, and monitoring the high-speed railway environment in real time by using a monitoring camera; the method has the advantages that the temperature signal of the host is received wirelessly, the temperature signal is input into the character storage module, and the character information to be converted is converted into the ASCII code value, because the character library of the video character superposition module can only identify ASCII codes, different commands are packaged into sub-functions with parameters through serial port communication between the character storage module and the character storage module, the repeated quantity of codes is greatly reduced by calling the sub-functions, and the compiling difficulty is reduced; a separation circuit is used for separating one path of analog video signals into field synchronizing signals and line synchronizing signals to control the start and the interruption of commands, and meanwhile, one path of analog video signals passes through a video signal amplification buffer circuit to obtain stable video signals; and superposing the processed video signal and the character representing the temperature change by using a video character superposition module to obtain a video character superposition signal, and transmitting the video character superposition signal to a display module. The analog video signal transmitted by the camera reduces the distortion and the impedance of the video signal through the video amplification buffer circuit, improves the transmission efficiency, and ensures the reliability and the high adaptability of the method.
The invention adopts the realization mode of hardware character superposition, has low requirement on the hardware of the whole system, simple network wiring, simple and convenient installation, low cost, high processing speed, high reliability, convenient use, easy management and convenient modification of display content and control setting; on a fast-running train, the implementation price is low, the effect is good, the requirements of use occasions are loose, and one circuit board is used in one passage without mutual influence.
Drawings
FIG. 1 is a flow chart of a method for overlaying rail temperature, beam temperature state temperature and video of a high-speed railway.
FIG. 2 is a flowchart of a character superimposition module program according to the present invention.
FIG. 3 is a block diagram of the rail temperature, beam temperature status temperature and video overlay system of the high-speed railway of the present invention.
In the figure: 1-a high-speed rail driving real-time monitoring camera; 2-a video amplification buffer circuit; 3-a beam temperature sensor; 4-a rail temperature sensor; 5-wireless receiving host; 6-a switching signal generator; 7-a synchronization signal separation circuit; 8-a character storage module; 9-video character superposition module; 10-display module.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 3, the system for superposing rail temperature and beam temperature state temperature and video of a high-speed railway comprises a high-speed railway running real-time monitoring camera 1, a video amplification buffer circuit 2, a beam temperature sensor 3, a rail temperature sensor 4, a wireless receiving host 5, a switching signal generator 6, a synchronous signal separation circuit 7, a character storage module 8, a video character superposition module 9 and a display module 10; the high-speed rail driving real-time monitoring camera 1 is arranged on a high-speed rail vehicle head and used for collecting position information of a fixed vehicle body of the high-speed rail. A video signal of the high-speed rail running real-time monitoring camera 1 is connected with a receiving end of a video character superposition module 9 through a video amplification buffer circuit 2, a field synchronizing signal and a line synchronizing signal are separated from one path of analog video signal of real-time monitoring video of the high-speed rail running real-time monitoring camera 1 through a synchronizing signal separation circuit 7, wherein the line synchronizing signal is directly connected with the receiving end of the video character superposition module 9, and the field synchronizing signal is connected with the receiving end of the video character superposition module 9 through a switch signal generator 6; the wireless receiving host 5 is connected with a video character superposition module 9 through a character storage module 8, the beam temperature sensor 3 is arranged at the head of a train and is only arranged at one position, the rail temperature sensor 4 is arranged on a plurality of track beams through which a high-speed rail train passes, the beam temperature sensor 3 and the rail temperature sensor 4 are respectively connected with the wireless receiving host 5 through wireless signals and send beam temperature signals and rail temperature signals to the video character superposition module 9 through wireless signals, and the video character superposition module 9 superposes the beam temperature signals and the rail temperature signals in a video of the high-speed rail running real-time monitoring camera 1 in a character mode and outputs the superposed signals to a display module 10 for display; the high-speed rail driving real-time monitoring camera 1 separates a field synchronization signal and a line synchronization signal from a real-time monitoring video through the synchronization signal separation circuit 7, the field synchronization signal determines the start of a field, and the line synchronization signal determines the start of a line.
The character storage module 8 is an MD27C512 chip, the character storage module 8 receives and stores temperature data, under the control of font library editing and generating software, characters of a chip burnt in advance are screened and filled, and character information is converted into ASCII code values. The types of the beam temperature sensor 3 and the rail temperature sensor 4 are SD123-T20 temperature and humidity intelligent wireless sensors, and the rail temperature sensor 4 fixed at the locomotive of the train and the beam temperature sensors 3 fixed on the rail beams at all positions are matched with FSK433MHZ wireless transmission to transmit temperature information to the wireless receiving host 5 moving to the rail or the rail beam at the position conveniently. The wireless receiving host 5 is a DTS500 host, is arranged on a fast moving high-speed rail, receives temperature information from the beam temperature sensor 3 and the rail temperature sensor 4, is connected with the character storage module 8, and transmits the temperature information to the character storage module 8 in a wired mode. The synchronous signal separation circuit 7 adopts an intelligent video separation chip with the model number LM1881N, and the synchronous signal separation circuit 7 is used for separating the synchronous signal into a line synchronous signal and a field synchronous signal, wherein the line synchronous signal determines the start of a line, and the field synchronous determines the start of a field. The video amplification buffer circuit 2 is a chip with the model AD812AN, and is used for an amplifier with impedance matching between input and output of front and rear signal stages, so that the impedance matching effect is achieved, the signal distortion is reduced, and the anti-interference effect is achieved. The switch signal generator 6 is used for detecting whether the video signals are normally transmitted or not, once the real-time monitoring camera 1 is cut off when the high-speed rail runs, the video signal synchronous separation circuit cannot detect video field synchronous signals, the signals are transmitted to the video superposition module 9, superposition of characters and videos is stopped, meanwhile, alarm information is sent out, and normal work is continued after abnormality is processed. The character library of the video character superposition module 9 can only recognize ASCII codes, so that character information to be converted needs to be converted into ASCII code values, and serial port communication between the character storage module 8 and the video character superposition module 9 is completed through Visual Basi language.
As shown in fig. 1, a method for overlaying a system for overlaying rail temperature, beam temperature state temperature and video of a high-speed railway comprises the following steps: the rail temperature sensor 3, the rail temperature sensor 4 and the high-speed rail running real-time monitoring camera 1 are used for respectively monitoring rail temperature and real-time environment changes, the rail temperature sensor 3 is arranged at the head of a train and is only arranged at one position, the rail temperature sensor 4 is arranged on a plurality of rail beams which a high-speed rail train must pass through, the wireless receiving host 5 receives temperature data information sent by the rail temperature sensor 3 and the rail temperature sensor 4 and transmits the temperature data information to the character storage module 8 for storage, then data in the character storage module 8 is sent to the video character superposition module 9 to be superposed with image data synchronous with the temperature data, the image data is matched with the video information to update temperature characters, and the character storage module 8 and the video character superposition module 9 are communicated through serial ports; the synchronous signal is separated into a line synchronous signal and a field synchronous signal by using a synchronous signal separation circuit 7, the field synchronous signal is detected by using a switching signal generator 6, so that whether the amplified video signal is transmitted to a video character superposition module 9 by a high-speed rail running real-time monitoring camera 1 running on a rail normally through a video amplification buffer circuit 2 or not is judged, and finally the video character superposition module 9 superposes data synchronously transmitted by a character storage module 8 and the video signal and outputs the superposed video to a video display module 10;
the method comprises the following specific steps:
step a, firstly, respectively measuring the rail temperature and the temperature of the beam temperature in real time by using a beam temperature sensor 3 and a rail temperature sensor 4, and transmitting temperature data to a wireless receiving host 5 connected with a video character superposition module 9 through wireless signals;
b, utilizing the high-speed rail running real-time monitoring camera 1 to monitor the environment in front of the vehicle head at the position reached by the high-speed rail running in real time;
step c, the wireless receiving host 5 transmits the received temperature data to the character storage module 8;
d, the character storage module 8 receives and stores the temperature data, and screens and fills the characters of the pre-burned chip into the storage chip of the character storage module 8 under the control of logo word library editing and generating software under the control of the Font Creator Program;
e, the character storage module 8 converts the screened characters into ASCII codes and sends the ASCII codes to the video character superposition module 9, and a character library of the video character superposition module 9 converts the received ASCII codes into characters;
step f, a synchronous signal separation circuit 7 separates the analog signal synchronous signal from the real-time monitoring video of the high-speed rail driving real-time monitoring camera 1 into a line synchronous signal and a field synchronous signal, wherein the line synchronous signal determines the start of one line of the analog signal of the high-speed rail driving real-time monitoring camera 1, and the field synchronous signal determines the start of one field of the analog signal of the high-speed rail driving real-time monitoring camera 1;
step g, line synchronizing signals are directly transmitted to a video character superposition module 9, field synchronizing signals are transmitted to the video character superposition module 9 through a switch signal generator 6, once the high-speed rail driving real-time monitoring camera 1 is cut off, a synchronizing signal separation circuit 7 cannot detect video field synchronizing signals, the synchronizing signal separation circuit 7 transmits abnormal signals to the video character superposition module 9 and stops superposition work of characters and videos, and meanwhile alarm information is sent out until the system continues normal work after the abnormality is processed;
and h, simultaneously, the video signal passes through the amplification buffer circuit 2 and is used for an amplifier with impedance matching between the input and output of the front and rear stages of the signal, so that the impedance matching effect is achieved, the signal distortion is reduced, and the anti-interference effect is achieved. The video signal is then transmitted to a video character superposition module 9;
step i, the video character superposition module 9 superposes the temperature characters and the video information processed by the video amplification buffer circuit 2 in real time in the video character superposition module 9, and finally the video superposed with the temperature characters is input to the display module 10 for displaying.
As shown in fig. 2, the character storage module 8 controls the display of characters by using the temperature data received by the wireless receiver 5, and performs real-time superimposition on the video character superimposition module 9 using a C language program together with the processed video signal, the line synchronization signal, and the field synchronization signal, and determines that the flag 1? The SEN indicator lights up to indicate whether data is received from the upper computer, waits for the timer 10ms interrupt to arrive, inquires about a serial port reception event during the timer interrupt, records the received data if the data is received, and displays the characters to be superimposed under the control of the program, with the reception flag1 being 1 and the RUN light on. If the character superimposition is successful, the flag is 1 and the RUN indicator lamp is normally on, otherwise, if the character superimposition is failed, the flag1 is 0 and the RUN indicator lamp is not on. And finally, the superposed signals are transmitted to the display module 10 to assist high-speed rail workers to better manage the safe driving of the high-speed rail.
Claims (10)
1. The utility model provides a high-speed railway rail temperature, beam temperature state temperature and video stack system which characterized in that: the system comprises a high-speed rail running real-time monitoring camera (1), a video amplification buffer circuit (2), a beam temperature sensor (3), a rail temperature sensor (4), a wireless receiving host (5), a switching signal generator (6), a synchronous signal separation circuit (7), a character storage module (8), a video character superposition module (9) and a display module (10);
the high-speed rail driving real-time monitoring camera (1) is arranged on a high-speed rail vehicle head and used for collecting position information of a fixed vehicle body of the high-speed rail; a video signal of the high-speed rail running real-time monitoring camera (1) is connected with a receiving end of a video character superposition module (9) through a video amplification buffer circuit (2), one path of analog video signal of a real-time monitoring video of the high-speed rail running real-time monitoring camera (1) is separated into a field synchronizing signal and a line synchronizing signal through a synchronizing signal separation circuit (7), wherein the line synchronizing signal is directly connected with the receiving end of the video character superposition module (9), and the field synchronizing signal is connected with the receiving end of the video character superposition module (9) through a switching signal generator (6); the wireless receiving host (5) is connected with a video character superposition module (9) through a character storage module (8), the beam temperature sensor (3) is arranged at the head of a train and is only arranged at one position, the rail temperature sensors (4) are arranged on a plurality of track beams through which a high-speed rail train passes, the beam temperature sensor (3) and the rail temperature sensors (4) are respectively connected with the wireless receiving host (5) through wireless signals and send beam temperature signals and rail temperature signals to the video character superposition module (9) through the wireless signals, and the video character superposition module (9) superposes the beam temperature signals and the rail temperature signals in a video of the high-speed rail running real-time monitoring camera (1) in a character mode and outputs the signals to a display module (10) for display; a real-time monitoring video of one path of the high-speed rail running real-time monitoring camera (1) is separated into a field synchronizing signal and a line synchronizing signal through a synchronizing signal separating circuit (7), the field synchronizing signal determines the start of one field, and the line synchronizing signal determines the start of one line.
2. A superimposing method using the superimposing system of the rail temperature, the beam temperature status temperature and the video of the high-speed railway according to claim 1, characterized in that: the rail temperature and real-time environment change are respectively monitored by using a beam temperature sensor (3), a rail temperature sensor (4) and a high-speed rail running real-time monitoring camera (1), the beam temperature sensor (3) is arranged at the head of a train and is only arranged at one position, the rail temperature sensor (4) is arranged on a plurality of rail beams which a high-speed rail train must pass through, a wireless receiving host (5) receives temperature data information sent by the beam temperature sensor (3) and the rail temperature sensor (4) and transmits the temperature data information to a character storage module (8) for storage, then data in the character storage module (8) is sent to a video character superposition module (9) to be superposed with image data synchronous with the temperature data, the image data is matched with the video information to update temperature characters, and the character storage module (8) and the video character superposition module (9) are communicated through a serial port; the method comprises the steps that a synchronous signal separation circuit (7) is used for separating a synchronous signal into a horizontal synchronous signal and a vertical synchronous signal, a switching signal generator (6) is used for detecting the vertical synchronous signal so as to judge whether an amplified video signal is sent to a video character superposition module (9) by a high-speed rail running real-time monitoring camera (1) running in a rail through a video amplification buffer circuit (2) to be normally transmitted or not, and finally the video character superposition module (9) superposes data synchronously sent by a character storage module (8) and the video signal and outputs the superposed video to a video display module (10);
the method comprises the following specific steps:
step a, firstly, a beam temperature sensor (3) and a rail temperature sensor (4) are utilized to respectively measure the rail temperature and the temperature of the beam temperature in real time, and temperature data are transmitted to a wireless receiving host (5) connected with a video character superposition module (9) through wireless signals;
b, utilizing a high-speed rail running real-time monitoring camera (1) to monitor the environment in front of the vehicle head at the position reached by the high-speed rail running in real time;
c, the wireless receiving host (5) transmits the received temperature data to the character storage module (8);
d, the character storage module (8) receives and stores the temperature data, screens the characters of the pre-burning chip under the control of logo character library editing and generating software under the control of a Font Creator Program, and fills the characters into a storage chip of the character storage module (8);
e, the character storage module (8) converts the screened characters into ASCII codes and then sends the ASCII codes to the video character superposition module (9), and a character library of the video character superposition module (9) converts the received ASCII codes into characters;
step f, a synchronous signal separation circuit (7) separates the analog signal synchronous signal from the real-time monitoring video of the high-speed rail running real-time monitoring camera (1) into a line synchronous signal and a field synchronous signal, wherein the line synchronous signal determines the start of one line of the analog signal of the high-speed rail running real-time monitoring camera (1), and the field synchronous signal determines the start of one field of the analog signal of the high-speed rail running real-time monitoring camera (1);
g, line synchronizing signals are directly transmitted to a video character superposition module (9), field synchronizing signals are transmitted to the video character superposition module (9) through a switch signal generator (6), once a high-speed rail running real-time monitoring camera (1) is cut off, a video signal synchronization separation circuit (7) cannot detect video field synchronizing signals, the video signal synchronization separation circuit (7) transmits abnormal signals to the video character superposition module (9) and stops superposition work of characters and videos, alarm information is sent out at the same time, and the system does not continue to work normally until the abnormality is processed;
h, simultaneously, enabling the video signals to pass through a video amplification buffer circuit (2) and an amplifier for impedance matching of input and output of front and rear stages of the signals, so that the impedance matching effect is achieved, and signal distortion and interference resistance are reduced; the video signal is transmitted to a video character superposition module (9);
and i, superposing the temperature characters and the video information processed by the video amplification buffer circuit (2) in real time in a video character superposition module (9) in the video character superposition module (9), and finally inputting the video superposed with the temperature characters into a display module (10) for display.
3. The superimposing method according to claim 2, characterized in that: the character storage module (8) is an MD27C512 chip, the character storage module (8) receives and stores temperature data, characters of the chip burned in advance are screened and filled under the control of font library editing and generating software, and character information is converted into ASCII code values.
4. The superposition method according to claim 2, characterized in that: the types of the beam temperature sensor (3) and the rail temperature sensor (4) are SD123-T20 humiture intelligent wireless sensors, and the rail temperature sensor (4) which is statically fixed at the locomotive of the train and the beam temperature sensors (3) which are fixed on the rail beams at all positions transmit temperature information to the wireless receiving host (5) by matching with FSK433MHZ wireless transmission.
5. The superposition method according to claim 2, characterized in that: the wireless receiving host (5) adopts a DTS500 host, is arranged on a fast moving high-speed rail, receives temperature information from the beam temperature sensor (3) and the rail temperature sensor (4), is connected with the character storage module (8), and transmits the temperature information to the character storage module (8) in a wired mode.
6. The superimposing method according to claim 2, characterized in that: the synchronous signal separation circuit (7) adopts an intelligent video separation chip with the model number of LM1881N, the synchronous signal separation circuit (7) is used for separating the synchronous signal into a line synchronous signal and a field synchronous signal, the line synchronous signal determines the start of a line, and the field synchronous signal determines the start of a field.
7. The superimposing method according to claim 2, characterized in that: the video amplification buffer circuit (2) is a chip with the model AD812AN, and is used for an amplifier with impedance matching between input and output of front and rear signal stages, so that the impedance matching effect is achieved, the signal distortion is reduced, and the anti-interference effect is achieved.
8. The superimposition method according to claim 2, characterized in that: the switch signal generator (6) is used for detecting whether video signals are normally transmitted or not, once the real-time monitoring camera (1) is cut off when the high-speed rail runs, the video signal synchronous separation circuit cannot detect video field synchronous signals, the signals are transmitted to the video character superposition module (9), superposition of characters and videos is stopped, alarm information is sent out simultaneously, and normal work is continued after abnormity is processed.
9. The superimposition method according to claim 2, characterized in that: the character library of the video character superposition module (9) can only recognize ASCII codes, so that character information to be converted is required to be converted into ASCII code values, and the character storage module (8) and the video character superposition module (9) are communicated through a serial port.
10. The superimposition method according to claim 2, characterized in that: the character storage module (8) controls the display of characters according to the temperature data received by the wireless receiving host (5), and carries out real-time superposition of images and characters on the video character superposition module (9) together with the processed video signal, the line synchronous signal and the field synchronous signal, wherein, in the superposition main program of the video character superposition module (9), the judgment that the flag1 is 1? A SEN indicator lamp is on, which indicates whether data is received from a wireless receiver, a timer is used for interrupting for 10ms, the timer interrupts to inquire whether a character storage module (8) has a receiving event, if the data is received, a receiving flag1 is 1, a RUN lamp is on, the received data is recorded, and characters to be superposed are displayed; if the character superimposition is successful, the flag is 1 and the RUN indicator light is normally on, otherwise, if the character superimposition is failed, the flag1 is 0, the video superimposition fails, and the RUN indicator light is not on; and finally, the superposed signals are transmitted to a display module (10) to assist high-speed rail workers to better manage the safe driving of the high-speed rail.
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