CN111769890A - Transponder production detecting system - Google Patents
Transponder production detecting system Download PDFInfo
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- CN111769890A CN111769890A CN202010581255.7A CN202010581255A CN111769890A CN 111769890 A CN111769890 A CN 111769890A CN 202010581255 A CN202010581255 A CN 202010581255A CN 111769890 A CN111769890 A CN 111769890A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/17—Detection of non-compliance or faulty performance, e.g. response deviations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
According to the transponder production detection system, the oscilloscope is used for completing the functions of signal acquisition and power detection, the oscilloscope is used for replacing a power meter to calculate the power of the acquired signal, and the power calculation can be carried out while the analysis of signal acquisition is realized; the radio frequency power amplifier and the C interface power amplifier adopt a narrow-band power amplifier which is independently researched and developed or manufactured in China to replace an expensive wide-band radio frequency power amplifier; the upper computer software is a high-efficiency automatic calibration test method designed based on a high-level programming language suitable for machine learning or data science work; the transponder production detection system realizes a hardware system with low cost, and can cover main indexes of transponder hardware production detection. The invention has the advantages that the transponder production detection system realizes a hardware system with low cost aiming at key test items, adopts a Matlab/Python design high-efficiency test method, adopts a compatible alternative structure and realizes a multifunctional detection means.
Description
Technical Field
The invention relates to the field of railway communication signals, in particular to a low-cost transponder production detection system.
Background
The transponder becomes necessary equipment for China national railway application CTCS1 level and above, and also becomes standard configuration in an urban rail transit signal system, and the transponder equipment standard is technical conditions for TB/T3485 transponder transmission systems. Correspondingly, the CRCC product certification enforcement rule specific requirement-responder is established by the mid-iron testing certification center, and the responder product testing project is defined.
The detection of hardware manufacturers mainly comprises three indexes: "input-output characteristic measurement", "uplink signal characteristic measurement", and "active control interface characteristic measurement". At present, all the projects at home and abroad are accepted by professional transponder test laboratories, the test projects are complicated, the test efficiency is low, and some manufacturers develop transponder production detection equipment, so that the test cannot be covered, or the developed equipment is expensive.
With the wide application of the transponder, a low-cost, more efficient and more intelligent detection system is urgently needed by a production unit to complete the detection of the key indexes of the transponder.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing transponder production detection system has the disadvantages of high hardware cost, high operation difficulty, complex test items and low test efficiency.
The invention provides a transponder production detection system.A system function module comprises a master control power supply, a 27M signal source, a C interface signal source, signal acquisition, power detection, a radio frequency power amplifier, a C interface power amplifier, a control computer, a special antenna bracket and a test antenna;
the method is characterized in that an oscilloscope is used for completing the functions of signal acquisition and power detection, the oscilloscope is used for replacing a power meter to calculate the power of an acquired signal, and the power calculation can be carried out while the analysis of signal acquisition is realized;
the radio frequency power amplifier and the C interface power amplifier adopt a narrow-band power amplifier which is independently researched and developed or manufactured in China to replace an expensive wide-band radio frequency power amplifier;
upper computer software in the control computer controls the 27M signal source to send out a 27M signal through a communication interface by using an SCPI instruction, controls the C interface signal source to send out a C interface signal at the same time, then activates a transponder through an A4 air interface by the 27M radio frequency signal sent out by a test antenna, and sends an uplink signal to the test antenna through an A1 air interface;
the upper computer software controls the oscilloscope to send the acquired 27M signals and uplink signals to the upper computer, and the upper computer analyzes and judges signal energy and signal quality and outputs a test result;
the upper computer software is a high-efficiency automatic calibration test method designed based on a high-level programming language suitable for machine learning or data science work;
the transponder production detection system realizes a hardware system with low cost, and can cover main indexes of transponder hardware production detection.
The invention has the advantages that the transponder production detection system realizes a hardware system with low cost aiming at key test items, adopts a Matlab/Python design high-efficiency test method, adopts a compatible alternative structure and realizes a multifunctional detection means. The invention has the obvious advantages of simple operation, automatic complete machine state judgment, automatic calibration and the like.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a system hardware block diagram
FIG. 2 is a flow chart of software control for visual inspection
FIG. 3 is a flow chart of input/output characteristic single item test control
FIG. 4 is a schematic view of an antenna mounting structure
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. It is apparent that the embodiments described below are not all embodiments. The exemplary embodiments of the present invention and the description thereof are provided herein for the purpose of illustration only and are not intended to be limiting.
The low-cost transponder production detection system is designed aiming at three important indexes of input and output characteristic measurement, uplink signal characteristic measurement and active control interface characteristic measurement, a system function module comprises a master control power supply, a 27M signal source, a C interface signal source, signal acquisition, power detection, a radio frequency power amplifier, a C interface power amplifier, a control computer, a special antenna bracket and a test antenna, and the system composition is shown in figure 1, wherein the master control power supply, the 27M signal source, the C interface signal source, the signal acquisition, the power detection, the radio frequency power amplifier, the C interface power amplifier and the control computer can be arranged in a control cabinet. The invention uses an oscilloscope to complete the functions of signal acquisition and power detection.
Firstly, the power supply functions of a 27M signal source, a C interface signal source, an oscilloscope, a radio frequency power amplifier, a C interface power amplifier and a control computer are completed through a master control power supply; upper computer software (designed by Matlab/Python) in a control computer controls a 27M signal source to send out a 27M signal by using an SCPI instruction through a USB (or LAN, GPIB) communication interface, wherein the 27M signal reaches a radio frequency power amplifier through an A4_ in interface cable, and is amplified by the radio frequency power amplifier and then reaches a test antenna through an A4_ out interface cable; simultaneously controlling upper computer software in the computer, using SCPI instruction to control the C interface signal source to send out C interface signal through USB (or LAN, GPIB) communication interface, the C interface signal reaches the C interface power amplifier through C _ in interface cable, and is connected with the responder tail cable through C _ out interface cable after being amplified by the C interface power amplifier; the oscilloscope collects 27M signals in the current probe on the test antenna through an A4_ mot interface cable, and the oscilloscope realizes the power monitoring function of the 27M signals; meanwhile, the test antenna sends out a 27M radio frequency signal, the transponder is activated through an A4 air interface, and the transponder sends out an uplink signal to the test antenna through an A1 air interface; the test antenna sends an uplink signal to the oscilloscope through the A1_ amp interface cable, and the oscilloscope completes the signal acquisition function of the uplink signal; the software of an upper computer in the computer is controlled, an SCPI instruction is used for sending the acquired 27M signal and the uplink signal to the upper computer through a USB (or LAN or GPIB) communication interface, and the upper computer analyzes and judges the signal energy and the signal quality and outputs a test result.
In the hardware part, an oscilloscope is used for replacing a power meter to calculate the power of the acquired signal, so that the power calculation can be carried out while the analysis of signal acquisition is realized; and an expensive broadband radio frequency power amplifier is replaced by a self-developed or domestic manufactured narrow-band power amplifier, so that the hardware cost is greatly reduced. In addition, the special antenna bracket used in the test is designed to be compatible with an inverted antenna mounting mode, so that the requirement on the use space is reduced, and the detailed description is given in the second embodiment.
The upper computer software is based on a high-level programming language suitable for machine learning or data science work, such as Matlab/Python and the like, and a high-efficiency automatic calibration test method is designed, and the effects and the processing speed of other languages on mathematical operation are greatly improved by utilizing the advantages of high development speed and super-strong software operational capability of the Matlab/Python software; the SCPI instruction is used for realizing the interaction with an instrument through a USB (or LAN, GPIB) communication interface, and the functions of complete machine state judgment, automatic calibration, automatic test, data analysis, data storage and the like are realized.
The invention has simple and flexible operation, and after the hardware is assembled, the responder needs to be manually replaced, and the hardware part does not need any operation; the test device can realize single-item test and one-key test, fully automatically operate in the test process, and realize the state judgment of the whole machine through signal acquisition and analysis; the test items can be flexibly configured, and the test items can be used for multiple functions of debugging and improving the transponder, detecting finished transponder products and returning the field fault transponder to the factory for maintenance besides realizing the production test of the transponder.
The control flow chart of the test software in fig. 2 summarizes the control principles of the software for three test indexes, i.e., "input/output characteristic measurement", "uplink signal characteristic measurement", and "active control interface characteristic measurement", and the detailed description is given below.
After the test is started, the upper computer software collects test information filled in an interface firstly, then uses an SCPI instruction to set the state of an instrument (an oscilloscope and a signal source) through a USB (or LAN and GPIB) communication interface, and checks the test information and the state of the whole computer, thereby finishing the functions of automatically checking information and judging the state of the whole computer, and avoiding the test error caused by manual operation error or equipment failure; and after the examination is passed, selecting a corresponding test item according to the collected test information, and carrying out corresponding test. In the whole test process, the upper computer software can automatically adjust the gears of the oscilloscope according to the signal energy acquired by the oscilloscope, so that the problem of data acquisition loss or low precision caused by overlarge or undersize signals is avoided.
The test item selects the input and output characteristic test (the following IO test) of the transponder, the IO test is a test for the response curve of the transponder to the radio frequency energy, firstly, the target value of the radio frequency energy is adjusted according to the IO test standard requirement of the transponder, and the target value can be flexibly configured according to the test purpose, so that the test efficiency is improved. After the target value is determined, the upper computer software controls the 27M signal source to send out a 27M signal, the 27M signal is amplified through a power amplifier and then is transmitted to the test antenna, the oscilloscope recovers the 27M signal on the test antenna, and an approximation method (coarse adjustment and fine adjustment are carried out firstly) is used for adjusting the 27M radio frequency energy to the target value according to the corresponding value and the proportion of the 27M signal of the signal source and the 27M signal of the antenna; the 27M radio frequency signal sent by the test antenna deactivates the transponder, the oscilloscope collects the uplink signal sent by the transponder and sends the uplink signal to the upper computer, and the upper computer records the 27M radio frequency energy and the corresponding uplink signal energy, judges the result and outputs a test report.
Selecting a transponder uplink signal characteristic test for the test item, firstly adjusting a target value of radio frequency energy according to test information and a test standard requirement, and adjusting 27M radio frequency energy to the target value by adopting the same method as the IO test; 27M radio frequency signals sent by the test antenna deactivate the transponder, and the oscilloscope collects uplink FSK signals sent by the transponder and sends the uplink FSK signals to the upper computer. The upper computer carries out data analysis on the uplink FSK test signal and calculates 7 important indexes of the FSK signal of the responder: the center frequency, the frequency deviation, the average transmission rate, the MTIE, the amplitude jitter, the signal bandwidth and the message information finish the control of the FSK signal quality sent by the responder. And the upper computer analyzes and judges the test result according to the standard requirement, automatically stores the abnormal waveform and outputs a test report. The test project uses upper computer software designed based on Matlab/Python to process and analyze signals, and the Matlab/Python has the advantages of super-strong development speed and fast computing capability, thereby greatly improving the processing speed of the software.
The test item selects the responder C interface signal test (only the active responder is subjected to the test, and the passive responder does not have a C interface cable), firstly, the C interface signal parameter is adjusted according to the responder C interface test standard requirement, and the adaptability of the responder to the C interface is tested. The test item adopts the same method as the uplink signal characteristic test to realize the adjustment of 27M radio frequency energy to a target value, the collection of uplink signals sent by a responder, the data analysis of the uplink FSK test signals and the calculation of 7 important indexes of the responder FSK signals. And analyzing and judging the test result according to the standard requirement, automatically storing the abnormal waveform and outputting a test report.
In the test, the test energy is automatically calibrated, the test record is automatically stored, and the test report is automatically output, so that the test efficiency is greatly improved, and the test error caused by human is reduced; in addition to the above single tests, the invention also realizes one-key test, based on the single tests of three indexes of input and output characteristic measurement, uplink signal characteristic measurement and active control interface characteristic measurement, and configures the test times of each test item according to the test requirements, so as to combine the test items and complete the one-key test. The invention makes the testing method more flexible, and can realize multiple functions of routing inspection testing, fault detection and the like aiming at a certain index or multiple indexes through different combinations of testing items.
Embodiment A input/output characteristic test control flow
The flow of the input-output characteristic single item test control is shown in fig. 3.
Firstly, test information, equipment numbers, equipment types, testers, test items and other information are manually input through a test window of upper computer software, and the upper computer software collects the test information and checks whether the test information is filled correctly and completely. The test is ended if the test information check fails. If the test information passes the check, the upper computer uses the SCPI instruction to carry out initialization setting on an instrument (an oscilloscope and a signal source) through a USB (or LAN and GPIB) communication interface.
After the setting is finished, the upper computer controls the signal source to send a 27M signal to activate the transponder, 27M signal energy and uplink signal energy collected by the oscilloscope are sent to the upper computer, and the purposes of checking the state of the whole machine and judging whether the instrument is normally started or not are achieved by analyzing the signal energy. And if the complete machine state check fails, popping up prompt information ('please check the instrument and the connecting line'), and finishing the test. And if the complete machine state check is passed, the upper computer creates an IO test record document.
The upper computer controls the signal source and the oscilloscope according to the target value by using an approximation method, so that the 27M radio frequency magnetic field energy is automatically adjusted to the target value, corresponding uplink signal energy is collected, the result is written into an IO test record document, the test record is analyzed and judged, and the test record and the test result are automatically stored; and finally, prompting test result information, outputting a report and finishing the test.
The test method realizes full automation of the test process, and comprises the processes of test information inspection, complete machine state judgment, energy calibration, test recording, test analysis and the like.
Example two antenna mount design
The present invention uses a special compatible antenna mount design, see fig. 4 for details, with the left side inverted mounting and the right side upright mounting.
According to the requirement of a test standard, the design of the antenna support ensures that the distance between an antenna for test and a tested transponder is accurate and 220mm, and simultaneously, the requirement of the distance between the transponder and the ground is more than 0.7 m. Taking a positive installation mode as an example, the antenna bracket of the system can fix the test antenna through a pillar below the shielding plate, the antenna cable is fixed by the combination of the shielding plate and the bending piece above the shielding plate, and the transponder is fixed by a fixture 220m below the test antenna, so that the distance between the test antenna and the transponder to be tested is ensured.
Considering that if the test antenna is above the transponder, the transponder needs to be inserted into the bracket, and the space between the position of the bracket for placing the transponder and the test antenna is small, which is inconvenient for production operators to operate, the antenna bracket of the invention can be compatible with the mounting mode of the inverted antenna, so that no other interferents are above the transponder, the antenna can be conveniently taken and used, and the requirement on the space is reduced.
The invention has the following technical effects: the transponder production detection system realizes a hardware system with low cost, can cover three main indexes of transponder hardware detection, has a pass-control on the quality of transponder products, is simple in overall operation, reduces the access threshold of workers, adopts a compatible alternative structure, reduces the requirement on space, simultaneously adopts a Matlab/Python design full-automatic test method, stops the calculation error caused by artificial output, greatly improves the working efficiency, has flexible and configurable test items, and realizes multifunctional detection means.
The above description is only a preferred embodiment of the present novel scheme, and is not intended to limit the scope of the present novel scheme. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the new scheme shall be included in the protection scope of the new scheme.
Claims (6)
1. A transponder production detection system, the system function module includes the total control power, 27M signal source, C interface signal source, signal acquisition, power detection, radio frequency power amplifier, C interface power amplifier, control computer, specialized antenna support, test antenna;
the method is characterized in that an oscilloscope is used for completing the functions of signal acquisition and power detection, the oscilloscope is used for replacing a power meter to calculate the power of an acquired signal, and the power calculation can be carried out while the analysis of signal acquisition is realized;
the radio frequency power amplifier and the C interface power amplifier adopt a narrow-band power amplifier which is independently researched and developed or manufactured in China to replace an expensive wide-band radio frequency power amplifier;
upper computer software in the control computer controls the 27M signal source to send out a 27M signal through a communication interface by using an SCPI instruction, controls the C interface signal source to send out a C interface signal at the same time, then activates a transponder through an A4 air interface by the 27M radio frequency signal sent out by a test antenna, and sends an uplink signal to the test antenna through an A1 air interface;
the upper computer software controls the oscilloscope to send the acquired 27M signals and uplink signals to the upper computer, and the upper computer analyzes and judges signal energy and signal quality and outputs a test result;
the upper computer software is a high-efficiency automatic calibration test method designed based on a high-level programming language suitable for machine learning or data science work;
the transponder production detection system realizes a hardware system with low cost, and can cover main indexes of transponder hardware production detection.
2. The transponder production detection system of claim 1, wherein the main indicators are three important indicators, namely "input/output characteristic measurement", "uplink signal characteristic measurement", and "active control interface characteristic measurement", and can implement single-item test and one-button test, and the test runs fully automatically.
3. The transponder production detection system of claim 2, wherein the one-touch test refers to a single test based on the three indexes, and the number of tests of each test item is configured according to a test requirement, so as to combine the test items.
4. Transponder production detection system according to claim 1, characterized in that the high-level programming language is for example Matlab or Python.
5. The transponder production detection system of claim 1 wherein the dedicated antenna mount is compatible with an inverted antenna mounting without additional interference above the transponder.
6. The transponder production detection system of claim 1, wherein in addition to implementing transponder production testing, the transponder production detection system can be used for multiple functions of transponder debugging improvement, transponder finished product detection, and field failure transponder return to factory maintenance.
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| WO2022089283A1 (en) * | 2020-10-29 | 2022-05-05 | 北京铁路信号有限公司 | Transponder c interface testing device |
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| CN111769890B (en) | 2022-08-23 |
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