CN116418429B - Test tool and test method for railway digital train tail channel machine - Google Patents
Test tool and test method for railway digital train tail channel machine Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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Abstract
The invention relates to the technical field of railway communication, and aims to provide a testing tool and a testing method for a railway digital train tail channel machine. The invention discloses a testing tool and a testing method for a railway digital train tail channel machine, which are based on a high-speed and high-anti-interference embedded digital processing technology and a computer software processing technology, realize AT instruction data interactive communication between computer testing software and testing tool equipment and between the testing tool equipment and the digital train tail channel machine, realize CSBK data transmission and various electric performance testing and control function operation testing of the digital train tail channel machine, and are mainly used for maintenance operation of a railway digital train tail communication system to improve the working efficiency and reliability of various functional testing of the digital train tail channel machine.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a testing tool and a testing method for a railway digital train tail channel machine.
Background
The railway train tail safety protection wireless communication system is an important component part in the railway transportation communication system in China, mainly realizes the functions of monitoring the wind pressure of the train tail and controlling the train tail host to carry out auxiliary exhaust braking, and has important effects on improving the railway transportation efficiency and guaranteeing the driving safety. With the development of railway transportation forms, a new generation railway train tail safety protection wireless communication system has evolved from analog wireless communication to digital wireless communication, and the digital wireless communication effectively reduces the problems of co-frequency interference, adjacent frequency interference and the like existing in the analog wireless communication, and effectively improves the safety and reliability of railway transportation.
The digital train tail channel machine is an important component part of the train tail machine platform, the train tail host, the train tail interphone and other wireless communication equipment in the railway train tail safety protection wireless communication system, and is very important to manage, use and maintain the digital train tail channel machine. In order to fully play the safety guarantee function of the digital train tail channel machine in railway transportation, the performance state of the digital train tail channel machine should be detected and maintained in time. The testing tool equipment of the digital train tail channel machine is an effective means for detecting each function of the digital train tail channel machine, and provides effective technical assurance for scientific application and management of the digital train tail communication machine.
The prior tail channel arranging machine has no test fixture equipment, and has the problems of manual operation, inaccurate test data, low working efficiency and the like. The testing tool and the testing method for the railway digital train tail channel machine are provided.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings in the prior art, the present application is directed to a testing tool for a railway digital train tail channel machine, where the testing tool is composed of a main control unit, a channel machine communication unit, a computer communication unit, an audio circuit unit, a key display unit, and a power supply unit;
the main control unit is connected with each component unit based on a specified protocol interface, communicates with each component unit, analyzes and processes data information transmitted on a communication link, controls the display of the color liquid crystal display screen, and timely responds to key operation;
the channel machine communication unit is used for analyzing the AT instruction sent by the computer test software by the main control unit, and forwarding the AT instruction to the digital train tail channel machine to realize the transmission of digital train tail communication data and various electrical performance test control commands;
The computer communication unit is used for realizing the conversion between TTL level and RS232 level, realizing the high-speed UART asynchronous serial data communication between the main control unit and the serial port of the computer, and realizing the high-speed AT instruction data transmission between the digital train tail channel machine test fixture equipment and the computer software;
the key display unit is used for realizing real-time display of AT instructions and AT instruction response data generated and received by the test tool equipment, and realizing instant call process display when the voice call test is realized;
the audio circuit unit is used for realizing high-fidelity output and restoration of audio signals and is beneficial to smooth implementation of audio data transmission test of the digital tail channel machine;
the power supply unit is used for providing Direct Current (DC) 18V working voltage for the tested digital tail channel machine;
preferably, the data communication between the main control unit and the digital tail channel machine adopts a UART high-speed asynchronous serial data communication mode.
Preferably, the AT instruction data interactive communication of the test fixture is that: the AT command is a character string which takes the AT as a head and ends the character, and whether each command is executed successfully or not has corresponding response return; the answer data content includes: the channel alias where the channel machine is currently located, the channel number, the transmit frequency, the receive frequency, the transmit power level, the time slot, the channel type, and the current channel parameter information of the color code.
Preferably, the computer communication unit adopts a signal level conversion chip to realize conversion between TTL level and RS232 level; the key display unit adopts a micro-touch switch key with pressure resistance and sensitive response, when the voice call test is realized, the channel is manually switched, the operation of the line emission function of the digital tail channel machine is manually controlled, and the friendly man-machine interaction interface is realized through the cooperation of the micro-touch switch key and the color liquid crystal display screen, so that the audio data transmission test is intuitively and reliably realized.
Preferably, the CSBK data transmission and each electrical performance test and control function operation test of the test tool are implemented by using: a column tail data transmission test, and/or an audio data transmission test, and/or parameter setting and inquiry, and/or an electrical performance index test and control; furthermore, the test tool implements an operation mode based on the combination of computer test software and equipment, and further, the data transmission, the audio data transmission and the parameters of testing and controlling various electrical performance parameters of the digital tail channel machine are accurately detected.
A test method for a railway digital train tail channel machine, the test method comprising the steps of:
Step one, testing column tail data transmission;
step two, audio data transmission testing;
step three, setting parameters and inquiring;
and step four, testing and controlling the electrical performance indexes.
Preferably, the digital tail channel machine test fixture device adopts computer test software to edit the tail command data and package the AT command, and sends the data to the test fixture device through a computer serial data communication interface, the test fixture device sends the tail command data to the digital tail channel machine and controls the digital tail channel machine to send the special line, the digital tail channel machine reads the tail data from the AT command, and then packages the CSBK data and sends the data to the test fixture device, the test fixture device host sends the AT command response data to the computer test software, the AT command and the AT command response transmitted in the process are simultaneously displayed on a color liquid crystal display screen of the test fixture device host, and after the tail command is received by the tail host, transmitting corresponding train tail command response data to a tested digital train tail channel machine, after demodulating the train tail command response data, packaging the data into AT command data, transmitting the AT command data to test tool equipment, transmitting the data to computer test software through an RS232 serial data communication interface, transmitting the AT command response data to the test tool equipment after the computer test software receives the train tail command response data, transmitting the AT command response data to the digital train tail channel machine by the test tool equipment, displaying the received AT command and AT command response on a color liquid crystal display screen, using the time and identity information of the tested digital train tail channel machine as marks by the computer test software, storing the time and the identity information of the tested digital train tail channel machine in a corresponding history record file, the management and maintenance work of the corresponding digital train tail channel machine is effectively realized.
Preferably, the digital train tail channel machine test fixture device adopts a high-quality microphone, a loudspeaker and a corresponding audio circuit to realize efficient voice call function test, the PTT key on the test fixture device is pressed to control the digital train tail channel machine to enter a transmitting state, at the moment, the microphone converts a test voice signal into an audio electric signal, the audio electric signal is regulated by an audio amplifier circuit and then is sent to the digital train tail channel machine to digitize the audio signal, the digital train tail channel machine wirelessly debugs and transmits the audio data signal based on a TDMA communication mode, the digital train tail channel machine detects a wireless carrier signal, the digital train tail channel machine informs the test fixture device by changing the level of a carrier detection end, meanwhile, the digital train tail channel machine demodulates the analog audio signal and transmits the audio signal to the test fixture device, the test fixture device detects the level signal change of the carrier signal end, namely, a loudspeaker audio power amplifier switch is opened, the audio signal is allowed to be transmitted to the loudspeaker to be played, the audio signal is amplified by the audio amplifier circuit and then is transmitted to the loudspeaker to be played, the audio data of the digital train tail channel machine is received, the audio data receiving test function is realized, and the test fixture device is displayed in real-time by the test fixture device, and the current state of the audio data is displayed in real-time, and the test process is displayed.
Preferably, the digital train tail channel machine test fixture equipment is provided with two channel setting modes, wherein the first mode is that channel setting is carried out on the digital train tail channel machine through a channel setting function of computer test software, the computer test software sends a channel switching AT instruction, the digital train tail channel machine is sent to the digital train tail channel machine to carry out channel switching through the test fixture equipment, the digital train tail channel machine sends an AT instruction response, and the AT instruction response is sent to the computer test software through the test fixture equipment, so that the channel setting function is finished; the second mode is that channel switching is carried out through a channel switching key on the test fixture equipment, after the test fixture equipment main control unit detects that the channel switching key is pressed, a corresponding AT instruction is generated and is sent to the digital tail channel machine, the digital tail channel machine sends an AT instruction response to the test fixture equipment, channel switching is carried out simultaneously, the channel switching AT instruction and the AT instruction response are displayed on a color liquid crystal display screen of the test fixture equipment in real time, computer test software has a channel parameter query function, the computer test software sends a channel query AT instruction, the channel query AT instruction is sent to the digital tail channel machine through the test fixture equipment, the digital tail channel machine sends an AT instruction response, and response data content comprises: the testing tool equipment displays the current channel parameter information on a color liquid crystal display screen, and simultaneously sends data to computer testing software for display, so that the channel parameter inquiry function is realized.
Preferably, the computer test software queries and sets the current channel sending and receiving electrical performance parameters, so as to realize testing and controlling the electrical performance of each item of the digital train tail channel machine, realize better wireless communication effect, and the current channel sending and receiving parameters of the digital train tail channel machine comprise: the digital train tail channel machine comprises a transmitting frequency, a receiving frequency, a transmitting time limit, a transmitting high-low power selection, a high power value, a low power value, a receiving squelch level, a receiving error rate and a receiving field intensity value, wherein the transmitting frequency, the transmitting power and the transmitting time limit of the digital train tail channel machine are controlled through inquiring and setting transmitting parameters, and the receiving squelch, the receiving error rate, the field intensity detection and other electrical performance testing functions of the digital train tail channel machine are controlled through inquiring and setting the receiving parameters.
The beneficial effects are that: the testing tool and the testing method for the railway digital train tail channel machine are based on a high-speed and high-anti-interference embedded digital processing technology and a computer software processing technology, realize AT instruction data interactive communication between computer testing software and testing tool equipment and between the testing tool equipment and the digital train tail channel machine, realize CSBK data transmission and various electric performance testing and control function operation testing of the digital train tail channel machine, improve the working efficiency and reliability of various functional testing of the digital train tail channel machine, and realize a friendly man-machine interaction interface by adopting a high-definition color liquid crystal display screen and micro touch switch keys.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a digital tail channel machine test fixture apparatus according to the present application;
FIG. 2 is a functional diagram of a computer test software of the test fixture device of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
The drawings in the embodiments of the application: the different kinds of cross-sectional lines in the drawings are not marked according to national standards, and the material of the elements is not required, so that the cross-sectional views of the elements in the drawings are distinguished.
Referring to fig. 1-2, a testing tool and a testing method for a railway digital train tail channel machine, wherein the testing tool comprises a main control unit, a channel machine communication unit, a computer communication unit, an audio circuit unit, a key display unit and a power supply unit;
The main control unit is connected with each component unit based on a specified protocol interface, communicates with each component unit, analyzes and processes data information transmitted on a communication link, controls the display of the color liquid crystal display screen, and timely responds to key operation;
the channel machine communication unit is used for analyzing the AT instruction sent by the computer test software by the main control unit, and forwarding the AT instruction to the digital train tail channel machine to realize the transmission of digital train tail communication data and various electrical performance test control commands;
the computer communication unit is used for realizing the conversion between TTL level and RS232 level, realizing the high-speed UART asynchronous serial data communication between the main control unit and the serial port of the computer, and realizing the high-speed AT instruction data transmission between the digital train tail channel machine test fixture equipment and the computer software;
the key display unit is used for realizing real-time display of AT instructions and AT instruction response data generated and received by the test tool equipment, and realizing instant call process display when the voice call test is realized;
the audio circuit unit is used for realizing high-fidelity output and restoration of audio signals and is beneficial to smooth implementation of audio data transmission test of the digital tail channel machine;
The power supply unit is used for providing direct current DC18V working voltage for the tested digital tail channel machine,
and the data communication between the main control unit and the digital train tail channel machine adopts a UART high-speed asynchronous serial data communication mode.
The AT command is a character string with AT as the head and ending characters, and each command is successfully executed or not and has corresponding response return.
The computer communication unit adopts a signal level conversion chip to realize conversion between TTL level and RS232 level.
The key display unit adopts a micro-touch switch key with pressure resistance and sensitive response, and when the voice call test is realized, the wireless transmitting function operation of the digital train tail channel machine is manually switched, and the friendly man-machine interaction interface is realized through the cooperation of the micro-touch switch key and the color liquid crystal display screen, so that the visual and reliable audio data transmission test is realized.
A test method for a railway digital train tail channel machine, the test method comprising the steps of:
step one, testing column tail data transmission;
step two, audio data transmission testing;
step three, setting parameters and inquiring;
and step four, testing and controlling the electrical performance indexes.
The digital tail channel machine test fixture device adopts computer test software to edit the tail command data and package the AT command, and sends the data to the test fixture device through a computer serial data communication interface, the test fixture device sends the tail command data to the digital tail channel machine and controls the digital tail channel machine to wirelessly send, the digital tail channel machine reads the tail data from the AT command, and then packages the CSBK data, then carries out wireless data modulation and sending, and sends AT command response data to the test fixture device, the test fixture device host sends the AT command response data to the computer test software, the AT command and the AT command response transmitted in the process are simultaneously displayed on a color liquid crystal display screen of the test fixture device host, when the tail command is received by the tail host, transmitting corresponding train tail command response data to a tested digital train tail channel machine, after demodulating the train tail command response data, packaging the data into AT command data, transmitting the AT command data to test tool equipment, transmitting the data to computer test software through an RS232 serial data communication interface, transmitting the AT command response data to the test tool equipment after the computer test software receives the train tail command response data, transmitting the AT command response data to the digital train tail channel machine by the test tool equipment, displaying the received AT command and AT command response on a color liquid crystal display screen, using the time and identity information of the tested digital train tail channel machine as marks by the computer test software, storing the time and the identity information of the tested digital train tail channel machine in a corresponding history record file, the management and maintenance work of the corresponding digital train tail channel machine is effectively realized.
The digital train tail channel machine test fixture device adopts a high-quality microphone, a loudspeaker and a corresponding audio circuit to realize efficient voice call function test, the PTT key on the test fixture device is pressed to control the digital train tail channel machine to enter a transmitting state, at the moment, the microphone converts a test voice signal into an audio electric signal, the audio electric signal is regulated by an audio amplifier circuit and then is sent to the digital train tail channel machine to digitize the audio signal, the digital train tail channel machine wirelessly debugs and transmits the audio data signal based on a TDMA communication mode, the digital train tail channel machine detects a wireless carrier signal, the digital train tail channel machine informs the test fixture device by changing the level of a carrier detection end, meanwhile, the digital train tail channel machine demodulates the analog audio signal and transmits the audio signal to the test fixture device, the test fixture device detects the level signal change of the carrier signal end, namely, a loudspeaker audio power amplifier switch is opened, the audio signal is allowed to be transmitted to the loudspeaker to play, the audio signal is transmitted to the loudspeaker to play after being amplified by the audio amplifier circuit, the audio data of the digital train tail channel machine is transmitted to the loudspeaker to receive the audio data, the test function is realized, and the test fixture device is displayed in real-time by the digital train tail channel machine communication process, and the operation state of the test fixture device is displayed.
The digital train tail channel machine test fixture equipment is provided with two channel setting modes, wherein the first mode is that channel setting is carried out on the digital train tail channel machine through a channel setting function of computer test software, the computer test software sends a channel switching AT instruction, the digital train tail channel machine is sent to the digital train tail channel machine through the test fixture equipment to carry out channel switching, the digital train tail channel machine sends an AT instruction response, and the AT instruction response is sent to the computer test software through the test fixture equipment, so that the channel setting function is completed; the second mode is that channel switching is carried out through a channel switching key on the test fixture equipment, after the test fixture equipment main control unit detects that the channel switching key is pressed, a corresponding AT instruction is generated and is sent to the digital tail channel machine, the digital tail channel machine sends an AT instruction response to the test fixture equipment, channel switching is carried out simultaneously, the channel switching AT instruction and the AT instruction response are displayed on a color liquid crystal display screen of the test fixture equipment in real time, computer test software has a channel parameter query function, the computer test software sends a channel query AT instruction, the channel query AT instruction is sent to the digital tail channel machine through the test fixture equipment, the digital tail channel machine sends an AT instruction response, and response data content comprises: the testing tool equipment displays the current channel parameter information on a color liquid crystal display screen, and simultaneously sends data to computer testing software for display, so that the channel parameter inquiry function is realized.
The computer test software queries and sets the current channel sending and receiving electrical performance parameters to realize the testing and control of each electrical performance of the digital tail channel machine, and realize a better wireless communication effect, wherein the current channel sending and receiving parameters of the digital tail channel machine comprise: the digital train tail channel machine comprises a transmitting frequency, a receiving frequency, a transmitting time limit, a transmitting high-low power selection, a high power value, a low power value, a receiving squelch level, a receiving error rate and a receiving field intensity value, wherein the transmitting frequency, the transmitting power and the transmitting time limit of the digital train tail channel machine are controlled through inquiring and setting transmitting parameters, and the receiving squelch, the receiving error rate, the field intensity detection and other electrical performance testing functions of the digital train tail channel machine are controlled through inquiring and setting the receiving parameters.
The test fixture equipment of the railway digital train tail channel machine is special detection equipment for the digital train tail channel machine, which is automatic and improves the working efficiency, and is mainly used for comprehensively detecting the digital data transmission, the audio data transmission and the operation of various electrical performance parameter test control functions of the digital train tail channel machine.
Based on the embedded digital processing technology and the computer software processing technology with high speed and high anti-interference, AT instruction data interactive communication between computer test software and test tool equipment and between the test tool equipment and the digital tail channel machine is realized, CSBK data transmission and various electrical performance test and control function operation test of the digital tail channel machine are realized, and the working efficiency and reliability of various functional test of the digital tail channel machine are improved.
The testing tool equipment for the digital train tail channel machine adopts a high-definition color liquid crystal display and micro-touch switch keys to realize a friendly man-machine interaction interface, and simultaneously combines a computer software processing technology and AT instruction data interaction communication to realize voice call function testing and audio data transmission effect detection, thereby guaranteeing the safety and reliability of the quality of the digital train tail channel machine.
The test tool equipment of the railway digital train tail channel machine is based on a high-speed embedded digital processing technology and a computer software processing technology, achieves AT instruction data interactive communication between computer test software and the test tool equipment and between the test tool equipment and the digital train tail channel machine, achieves CSBK data transmission and various electric performance test and control function operation of the digital train tail channel machine, effectively improves various function test work efficiency of the digital train tail channel machine, effectively improves stability and reliability of test data, is favorable for management and maintenance of the digital train tail channel machine, and effectively improves safety and reliability of a digital train tail wireless communication system.
The digital train tail channel machine test fixture device stores the historical test data by adopting computer test software, and the historical test data is quickly and accurately inquired and managed by the computer software, so that the management, detection and maintenance work efficiency of the digital train tail channel machine is effectively improved.
The testing tool equipment for the digital train tail channel machine adopts a high-definition color liquid crystal display and micro-touch switch keys to realize a friendly man-machine interaction interface, and simultaneously combines a computer software processing technology and AT instruction data interaction communication to realize voice call function testing and audio data transmission effect detection, thereby guaranteeing the safety and reliability of the quality of the digital train tail channel machine.
The digital train tail channel machine testing tool equipment mainly comprises a main control unit, a channel machine communication unit, a computer communication unit, an audio circuit unit, a key display unit, a power supply unit and the like.
The main control unit is connected with each component unit based on a specified protocol interface, communicates with each component unit, analyzes and processes data information transmitted on a communication link, controls the display of the color liquid crystal display screen, and timely responds to key operation.
The main control unit is built based on an embedded microprocessor chip, is a new generation microprocessor with high speed, low power consumption, low cost and super anti-interference capability, the instruction code is completely compatible with the traditional 8051 single chip microcomputer, the CPU running speed is 8 to 12 times faster than that of the traditional 8051 single chip microcomputer, a large-capacity program memory is arranged in the main control unit, a reset circuit special for MAX810, a 2-path PWM, an 8-path high-speed 10-bit A/D converter and the like are integrated, and the main control unit is stable and reliable in running and is particularly suitable for strong interference occasions such as railways, mining areas and the like.
1) Based on the high-speed UART asynchronous serial data communication interface, the high-speed data communication function of the computer communication unit and the main control unit is realized, the transmission of train tail communication data such as CSBK data and the like is realized, and the transmission of various electrical performance tests and control commands of the digital train tail channel machine is realized.
2) Based on a high-speed UART asynchronous serial data communication interface, the high-speed data communication function of the main control unit and the communication unit of the channel machine is realized, the transmission of column tail communication data such as CSBK data and the like is realized, and the transmission of various electrical performance test control commands of the digital column tail channel machine is realized.
3) Based on the parallel GPIO interface, the display control of the main control unit on the color liquid crystal display screen and the timely response of the micro-touch switch key are realized.
4) Based on the GPIO interface, the detection of the digital train tail channel carrier frequency detection level signal by the main control unit is realized, the control of the wireless transmission of the digital train tail channel machine by the main control unit is realized, and the control of the loudspeaker audio power amplifier switch of the audio unit by the main control unit is realized.
The data communication between the main control unit and the digital train tail channel machine adopts a UART high-speed asynchronous serial data communication mode. The main control unit analyzes the AT instruction sent by the computer test software, and then forwards the AT instruction to the digital train tail channel machine, so that the transmission of digital train tail communication data and various electrical performance test control commands is realized. Otherwise, the main control unit receives AT instruction response data sent by the digital train tail channel machine and then forwards the AT instruction response data to the computer test software, so that interaction of various command data of the digital train tail channel machine and the computer test software is realized. The AT command is a character string with the AT as the head and the character ending, and each command is returned with a corresponding response if being executed successfully, so that the AT command is concise and easy to understand, the communication efficiency is high, the communication data structure is effectively simplified, the working efficiency of the test work is improved, and the reliability of data transmission is effectively improved.
The computer communication unit adopts a signal level conversion chip to realize the conversion between TTL level and RS232 level, realize the high-speed UART asynchronous serial data communication between the main control unit and the serial port of the computer, and realize the high-speed AT instruction data transmission between the digital train tail channel machine test fixture equipment and the computer software.
The key display unit adopts a high-definition and low-power-consumption color liquid crystal display screen to realize real-time display of AT instructions and AT instruction response data generated and received by the test tool equipment, and realizes instant call process display when the voice call test is realized. The key display unit adopts a micro-touch switch key with pressure resistance and sensitive response, and when the voice call test is realized, the channel is manually switched, and the wireless transmitting function operation of the digital train tail channel machine is manually controlled. Through the cooperation of the micro-touch switch key and the color liquid crystal display, a friendly man-machine interaction interface is realized, and visual and reliable audio data transmission test is realized.
The audio circuit unit is connected with high-quality microphone and loudspeaker equipment, and adopts a low-noise and anti-interference audio amplifier circuit to realize high-fidelity output and restoration of audio signals, thereby being beneficial to smooth implementation of audio data transmission test of the digital tail channel machine.
The main control unit detects the pressing of a channel key, and sends a production channel switching AT instruction to the digital train tail channel machine to control the digital train tail channel machine to switch to a required channel. The PTT key is connected with the PTT end of the digital train tail channel machine, when the PTT is pressed down, the digital train tail channel machine can be controlled to enter a wireless transmitting state, after the channel machine enters the wireless transmitting state, the microphone converts a test voice signal into an analog audio signal and sends the analog audio signal to the audio amplifier circuit for audio amplitude adjustment, and then the analog audio signal is sent to the digital train tail channel machine for audio sampling digitization, and then wireless data modulation and transmission are carried out.
The digital train tail channel machine detects the carrier frequency signal, demodulates and restores the audio data signal in the carrier frequency signal to the analog audio signal, sends the analog audio signal to the audio power amplifier circuit for signal amplification, and finally sends the analog audio signal to the loudspeaker for voice playing. The main control unit only controls the audio power amplifier switch to be opened when detecting that the digital train tail channel machine has carrier wave input, namely, when the level signal of the carrier frequency detection end of the digital train tail channel machine changes, the audio signal is allowed to be sent to the loudspeaker for playing, otherwise, the audio channel switch is closed, so that the noise at the bottom of the digital train tail channel machine is prevented from being output to the loudspeaker and generating noise when no carrier wave is received.
The digital train tail channel machine testing tool equipment adopts a direct-current DC18V power supply to DC5V stabilized voltage power supply module to provide stable and reliable working voltage for each unit, and meanwhile, the power supply unit provides direct-current DC18V working voltage for the tested digital train tail channel machine.
Preferably, when a digital tail channel machine performs a test operation, the digital tail channel machine test fixture device is used for efficiently and accurately detecting parameters such as data transmission, audio data transmission, and test and control of various electrical performance parameters of the digital tail channel machine, so as to timely remove related faults of the digital tail channel machine, further effectively improve the test working efficiency of the digital tail channel machine, and improve the safety and reliability of the digital tail wireless communication system.
Preferably, when a series of digital tail channel machines are used for carrying out test operation, the digital tail channel machine test fixture system needs to use a computer software technology and a high-speed asynchronous serial data communication technology, and further, the digital tail channel machine test fixture equipment implements an operation mode based on the combination of computer test software and equipment, so that the accurate detection of parameters such as data transmission, audio data transmission, various electrical performance parameter tests and control of the digital tail channel machines is realized, and the purpose of timely eliminating related faults of the digital tail channel machines is achieved, so that the test work efficiency of the digital tail channel machines is effectively improved, and the safety and reliability of the digital tail wireless communication system are improved.
And then, the train tail data transmission test is carried out, and based on a digital mobile radio standard protocol, the digital train tail channel machine wireless communication system adopts a TDMA communication mode to realize the wireless communication transmission of the train tail data. The digital train tail channel machine wireless communication system adopts a control signaling message data structure (CSBK data structure) in the DMR protocol to encapsulate train tail command and train tail command response data, and then carries out wireless data modulation and transmission on the data. The CSBK data structure is safe and efficient, so that the CSBK data structure is particularly suitable for transmission of column tail data, the transmission efficiency of the column tail data is effectively improved, the safety and reliability of the transmission of the column tail data are effectively improved, the digital column tail channel machine test fixture equipment edits the column tail command data by adopting computer test software and performs AT instruction encapsulation, the column tail command data are transmitted to the test fixture equipment through a computer serial data communication interface, and the test fixture equipment transmits the column tail command data to the digital column tail channel machine and controls the digital column tail channel machine to perform wireless transmission. The digital train tail channel machine reads train tail data from the AT instruction, then carries out wireless data modulation and transmission after CSBK data encapsulation, and transmits AT instruction response data to the test tool equipment, and the test tool equipment host computer transmits the AT instruction response data to the computer test software. The AT command and AT command response transmitted in the process are simultaneously displayed on a color liquid crystal display screen of a host computer of the test fixture equipment, when the host computer receives a column tail command, corresponding column tail command response data are transmitted to a tested digital column tail channel machine, the digital column tail channel machine demodulates the column tail command response data, the data are packaged into AT command data and then transmitted to the test fixture equipment, the test fixture equipment transmits the data to computer test software through an RS232 serial data communication interface, the computer test software transmits the AT command response data to the test fixture equipment after receiving the column tail command response data, the test fixture equipment transmits the AT command response data to the digital column tail channel machine, the received AT command and AT command response are displayed on the color liquid crystal display screen, and the computer test software stores the communication data and the communication success or failure in all the test processes in a corresponding history record file by taking the time and the identity information of the tested digital column tail channel machine as marks, so that management and maintenance work of the corresponding digital column tail channel machine are effectively realized.
And then, performing audio data transmission test, wherein the digital train tail channel machine test fixture equipment adopts a high-quality microphone, a high-quality loudspeaker and a corresponding audio circuit, so that efficient voice call function test is realized. The PTT key on the test fixture equipment is pressed to control the digital train tail channel machine to enter a transmitting state, at the moment, the microphone converts the test voice signal into an audio electric signal, and the audio electric signal is adjusted by the audio amplifier circuit and then is sent to the digital train tail channel machine for audio signal digitization. Based on a TDMA communication mode, the digital train tail channel machine carries out wireless debugging and sending on the audio data signals, after the digital train tail channel machine detects wireless carrier signals, the digital train tail channel machine informs the test fixture equipment by changing the level of the carrier detection end, and meanwhile, the digital train tail channel machine demodulates the analog audio signals and sends the analog audio signals to the test fixture equipment. The test fixture equipment detects the level signal change of the carrier signal end, namely, a horn audio power amplifier switch is opened, and the audio signal is allowed to be sent to the horn for playing. The audio signal is amplified by the audio amplifier circuit and then sent to the loudspeaker for voice playing, so that the audio data receiving and testing function of the digital tail channel machine is realized, and in the communication process of the digital tail channel machine, the color liquid crystal display screen of the test fixture equipment displays the current channel number, the transmitting state and the receiving state of the digital tail channel machine in real time, so that the display of the simple and clear audio data communication test process is realized.
Then parameter setting and inquiry are carried out, the digital train tail channel machine test fixture equipment has two channel setting modes, the first mode is that the digital train tail channel machine is subjected to channel setting through the channel setting function of computer test software, the computer test software sends a channel switching AT instruction, the digital train tail channel machine is subjected to channel switching through the test fixture equipment, the digital train tail channel machine responds by sending the AT instruction, and the digital train tail channel machine sends the response to the computer test software through the test fixture equipment, so that the channel setting function is completed; the second mode is that channel switching is carried out through a channel switching key on the test fixture equipment, after the main control unit of the test fixture equipment detects that the channel switching key is pressed, a corresponding AT instruction is generated and sent to the digital train tail channel machine, and the digital train tail channel machine sends an AT instruction response to the test fixture equipment and simultaneously carries out channel switching. The channel switching AT instruction and the AT instruction response are displayed on a color liquid crystal display screen of the test fixture equipment in real time; the computer test software has a channel parameter query function, the computer test software transmits a channel query AT instruction, the channel query AT instruction is transmitted to the digital train tail channel machine through the test tool equipment, the digital train tail channel machine transmits an AT instruction response, and the response data content comprises: the channel alias where the channel machine is currently located, the channel number, the transmit frequency, the receive frequency, the transmit power level, the time slot, the channel type, and the current channel parameter information of the color code. The test fixture device displays the current channel parameter information on the color liquid crystal display screen, and simultaneously sends data to the computer test software for display, so that the channel parameter query function is realized.
And finally, testing and controlling the electrical performance indexes, wherein the computer testing software queries and sets the electrical performance parameters sent and received by the current channel, so that the electrical performance testing and controlling of each item of digital tail channel machine are realized, and a better wireless communication effect is realized. The current channel sending and receiving parameters of the digital train tail channel machine comprise: transmitting frequency, receiving frequency, transmitting time limit, transmitting high-low power selection, high power value, low power value, receiving squelch level, receiving error rate and receiving field intensity value. The control of the electric performance test function of the digital tail channel machine transmitting frequency, transmitting power and transmitting time limit is realized through inquiring and setting the transmitting parameters. The inquiry and setting of the receiving parameters are used for controlling the receiving squelch, the receiving error rate, the field intensity detection and other electrical performance test functions of the digital train tail channel machine, and the computer test software stores the inquiry and setting results in corresponding special history record files, so that the efficient management and maintenance of the digital train tail channel machine are realized, and the production and test efficiency of the digital train tail channel machine is improved.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (9)
1. A CSBK data transmission and each electrical property test and control function operation test fixture for railway digital train tail channel machine, its characterized in that: the test fixture consists of a main control unit, a channel machine communication unit, a computer communication unit, an audio circuit unit, a key display unit and a power supply unit;
the channel machine communication unit is used for analyzing the AT instruction sent by the computer test software by the main control unit and forwarding the AT instruction to the digital train tail channel machine; the computer communication unit is used for converting between TTL level and RS232 level, further carrying out high-speed UART asynchronous serial data communication between the main control unit and a computer serial port, and carrying out high-speed AT instruction data transmission between the digital train tail channel machine test fixture equipment and computer software; the key display unit is used for displaying the AT instruction and the data of the AT instruction response generated and received by the test fixture equipment in real time; the audio circuit unit is used for outputting and restoring the audio signal with high fidelity; the power supply unit is used for providing direct current DC13.8V working voltage for the tested digital tail channel machine; the data communication between the main control unit and the digital train tail channel machine adopts a UART high-speed asynchronous serial data communication mode;
The computer communication unit adopts a signal level conversion chip, the key display unit adopts a micro-touch switch key which is resistant to pressing and sensitive in response, and the micro-touch switch key is matched with the color liquid crystal display screen; the main control unit is connected with each component unit based on a specified protocol interface, communicates with each component unit, analyzes and processes data information transmitted on a communication link, controls the display of the color liquid crystal display screen, and timely responds to key operation.
2. The test fixture for a railway digital train tail channel machine according to claim 1, wherein: the test fixture is based on a high-speed and high-anti-interference embedded digital processing technology and a computer software processing technology, and AT instruction data interactive communication between computer test software and test fixture equipment and between the test fixture equipment and a digital train tail channel machine is implemented, so that CSBK data transmission and various electrical performance test and control function operation test of the digital train tail channel machine are realized.
3. The test fixture for a railway digital train tail channel machine according to claim 2, wherein: AT instruction data interactive communication of the test fixture is realized by utilizing: the AT command is a character string which takes the AT as a head and ends the character, and whether each command is executed successfully or not has corresponding response return; the answer data content includes: the channel alias where the channel machine is currently located, the channel number, the transmit frequency, the receive frequency, the transmit power level, the time slot, the channel type, and the current channel parameter information of the color code.
4. The test fixture for a railway digital train tail channel machine according to claim 2, wherein: the CSBK data transmission and various electrical property test and control function operation test of the test tool are realized by using: a column tail data transmission test, and/or an audio data transmission test, and/or parameter setting and inquiry, and/or an electrical performance index test and control; furthermore, the test tool implements an operation mode based on the combination of computer test software and equipment, and further, the data transmission, the audio data transmission and the parameters of testing and controlling various electrical performance parameters of the digital tail channel machine are accurately detected.
5. A test method using the test fixture for a railway digital train tail channel machine according to any one of claims 1 to 4, characterized in that: the test method comprises the following steps: step one, testing column tail data transmission; step two, audio data transmission testing; step three, setting parameters and inquiring; and step four, testing and controlling the electrical performance indexes.
6. The method for testing a railway digital tail channel machine according to claim 5, wherein: the digital tail channel machine test fixture adopts computer test software to edit tail command data and package AT instructions, the tail command data is sent to the test fixture through a computer serial data communication interface, the test fixture sends the tail command data to the digital tail channel machine and controls the digital tail channel machine to wirelessly send, the digital tail channel machine reads the tail data from the AT instructions, then the digital tail channel machine packages CSBK data, then carries out wireless data modulation and sending, and sends AT instruction response data to the test fixture, a host of the test fixture sends the AT instruction response data to the computer test software, the AT instructions and AT instruction responses transmitted in the process are simultaneously displayed on a color liquid crystal display screen of the host of the test fixture, after the tail host receives the tail command, and after receiving the train tail command response data, the computer test software sends the AT command response data to the test tool equipment, the test tool equipment sends the AT command response data to the digital train tail channel machine, and displays the received AT command and AT command response on a color liquid crystal display screen, and the computer test software takes the time and the identity information of the tested digital train tail channel machine as marks and stores the marks in a corresponding history record file.
7. The method for testing a railway digital tail channel machine according to claim 5, wherein: the digital train tail channel machine test fixture equipment adopts a high-quality microphone, a loudspeaker and a corresponding audio circuit, the digital train tail channel machine is controlled to enter a transmitting state by pressing a PTT key on the test fixture equipment, at the moment, a test voice signal is converted into an audio electric signal by the microphone, the audio electric signal is regulated by an audio amplifier circuit and then is sent to the digital train tail channel machine for audio signal digitization, the digital train tail channel machine carries out wireless modulation and transmission on an audio data signal based on a TDMA communication mode, after the digital train tail channel machine detects a wireless carrier signal, the digital train tail channel machine informs the test fixture equipment through changing the level of a carrier detection end, meanwhile, the digital train tail channel machine demodulates an analog audio signal and sends the analog audio signal to the test fixture equipment, the test fixture equipment detects the level signal change of the carrier signal end, namely, a loudspeaker audio power amplifier switch is opened, the audio signal is allowed to be sent to the loudspeaker for playing, the audio signal is sent to the loudspeaker for voice playing after being amplified by the audio amplifier circuit, and the audio signal is sent to the loudspeaker for the voice playing, and the color liquid crystal display screen of the test fixture equipment displays the current channel number, the transmitting state and receiving state information in real time.
8. The method for testing a railway digital tail channel machine according to claim 5, wherein: the digital train tail channel machine test fixture equipment is provided with two channel setting modes, wherein the first mode is to set a channel of the digital train tail channel machine through a channel setting function of computer test software, the computer test software sends a channel switching AT instruction, the channel switching AT instruction is sent to the digital train tail channel machine through the test fixture equipment, the digital train tail channel machine responds by sending the AT instruction, and the AT instruction is sent to the computer test software through the test fixture equipment, so that the channel setting function is completed; the second mode is that channel switching is carried out through a channel switching key on the test fixture equipment, after the test fixture equipment main control unit detects that the channel switching key is pressed, a corresponding AT instruction is generated and is sent to the digital tail channel machine, the digital tail channel machine sends an AT instruction response to the test fixture equipment, channel switching is carried out simultaneously, the channel switching AT instruction and the AT instruction response are displayed on a color liquid crystal display screen of the test fixture equipment in real time, computer test software has a channel parameter query function, computer test software sends a channel query AT instruction, the channel query AT instruction is sent to the digital tail channel machine through the test fixture equipment, and the digital tail channel machine sends the AT instruction response; and the test fixture equipment displays the current channel parameter information on the color liquid crystal display screen, and simultaneously sends the data to the computer test software for display.
9. The method for testing a railway digital tail channel machine according to claim 5, wherein: the computer test software queries and sets the current channel sending and receiving electric performance parameters, and the current channel sending and receiving parameters of the digital train tail channel machine comprise: transmitting frequency, receiving frequency, transmitting time limiter, transmitting high and low power selection, high power value, low power value, receiving squelch level, receiving error rate and receiving field intensity value; further, through inquiring and setting the transmitting parameters, the digital train tail channel machine transmits the control of the electric performance test of the frequency, the power and the time limit; and then, through inquiring and setting the receiving parameters, the digital tail channel machine receives control of electrical performance tests of squelch, receiving error rate and field intensity detection.
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Denomination of invention: A Testing Fixture and Method for Railway Digital Train Tail Channel Machine Effective date of registration: 20231220 Granted publication date: 20230919 Pledgee: China Postal Savings Bank Co.,Ltd. Quanzhou Licheng District Branch Pledgor: Fujian Quanzhou Tietong Electronic Equipments Co.,Ltd. Registration number: Y2023980072535 |