CN114325134A - Automatic test system for frequency response characteristics of locomotive signal receiving antenna - Google Patents
Automatic test system for frequency response characteristics of locomotive signal receiving antenna Download PDFInfo
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Abstract
The automatic test system for the frequency response characteristic of the locomotive signal receiving antenna comprises a main control unit, a phase-locked amplifier unit, a current acquisition unit, a test system host and a test bench, wherein the automatic test system can automatically complete the frequency response characteristic test of the receiving antenna, record and analyze test results and output a test report; and an optimized reference model can be provided for the frequency response characteristic design of the receiving antenna. The invention has the following technical effects: the invention is based on the phase-locked amplification technology, can inhibit interference and improve the measurement precision; by adopting an automatic control technology, the full-automatic test of the frequency response characteristic of the receiving antenna can be realized, and the test efficiency is improved; the design of the receiving antenna with the customized frequency response characteristic can be quickly finished by matching the receiving antenna with the adjustable frequency response characteristic.
Description
Technical Field
The invention relates to the field of locomotive signal control in the railway industry, in particular to an automatic test system for the frequency response characteristic of a locomotive signal receiving antenna.
Background
The locomotive signal receiving antenna is a key part for receiving track circuit signals by locomotive signal vehicle-mounted system equipment and a Track Circuit Reader (TCR), and has a large amount of application in the China railway industry. The locomotive signal receiving antenna receives track circuit current signals in the steel rail through an electromagnetic induction principle, converts the track circuit current signals into voltage signals and outputs the voltage signals to the vehicle-mounted host for decoding. The main technical parameters of the receiving antenna are specified in TB/T3287 and 2013 locomotive signal vehicle-mounted system equipment, such as direct current resistance, inductance, quality factor and frequency response characteristic. The frequency response characteristic of the receiving antenna refers to the relationship between the magnitude of a track circuit current signal in a steel rail and the magnitude of a receiving antenna induced voltage signal.
A standard test method is provided for the frequency response characteristic of a receiving antenna in TB/T3287 and 2013 cab signal vehicle-mounted system equipment. The test method comprises the steps of sending track circuit current signals with fixed size on two 4-meter-long steel rails which are placed in parallel, and testing voltage signals induced by a receiving antenna. The tested frequency points are 9 in number, namely 25Hz, 550Hz, 650Hz, 750Hz, 850Hz, 1700Hz, 2000Hz, 2300Hz and 2600Hz, and the track circuit current of each frequency point is different in magnitude. When the frequency response characteristic of a receiving antenna is tested at present, a signal generator, a power amplifier, an ammeter, a voltmeter and other discrete devices are adopted, the current is required to be manually adjusted, and measurement data is required to be read and recorded.
With the technological progress and social development, electrical and electronic equipment is ubiquitous, which causes a large amount of electromagnetic interference in space, so that when a frequency response characteristic test of a receiving antenna is carried out, the receiving antenna is easily affected by the interference, and the test result is inaccurate.
Along with the wider application range of the receiving antenna, the receiving antenna covers various application scenes such as large railways, subways, inter-city railways and the like, the requirement on the receiving antenna is not limited to the frequency response characteristic meeting the standard requirement any more, and different frequency response characteristic requirements are provided for various application scenes. At present, no receiving antenna with adjustable frequency response characteristics and a matched test system exist.
Disclosure of Invention
Aiming at the defects and shortcomings of the frequency response characteristic test of the receiving antenna, the invention provides an automatic test system for the frequency response characteristic of the receiving antenna.
The invention provides an automatic test system for the frequency response characteristic of a locomotive signal receiving antenna, which consists of a main control unit, a phase-locked amplifier unit, a current acquisition unit, a test system host and a test bench,
the test bench is composed of steel rails and a receiving coil hoisting frame, the receiving coil hoisting frame is used for hoisting a receiving antenna to be tested above the two steel rails, and the distance between the lower surface of the receiving antenna and the rail surface of the steel rails can be adjusted;
the test system host comprises a driving module and a signal acquisition module, wherein the driving module is used for amplifying the power of a test driving signal output by the phase-locked amplifier unit, driving a steel rail in a test rack to generate a track circuit current signal to be tested after passing through a high-precision resistor, and simultaneously providing test points at two ends of the high-precision resistor for the current acquisition unit to measure the voltage values at two ends of the high-precision resistor; the signal acquisition module is in impedance matching with the tested receiving antenna and outputs an induced voltage signal of the receiving antenna to the phase-locked amplifier unit;
the main control unit is a control core of the automatic test system, performs information transmission with the lock-in amplifier unit and the current acquisition unit in a wired or wireless mode, sends a control command and receives acquired data;
the phase-locked amplifier unit adopts a phase-locked amplification technology, can perform ultra-narrow band demodulation on a specific frequency signal, and inhibits useless noise; the phase-locked amplifier unit receives a control command of the main control unit, generates the test driving signal and outputs the test driving signal to the test system host, and meanwhile, the phase-locked amplifier unit receives a receiving antenna induced voltage signal output by the test system host;
the current acquisition unit adopts a high-precision voltmeter, measures two paths of voltage acquisition signals output by the driving module in the test system host, and outputs a measurement result to the main control unit;
the automatic test system can automatically complete the frequency response characteristic test of the receiving antenna, record and analyze the test result and output a test report; and an optimized reference model can be provided for the frequency response characteristic design of the receiving antenna.
The invention has the following technical effects: the invention is based on the phase-locked amplification technology, can inhibit interference and improve the measurement precision.
The invention adopts an automatic control technology, can realize the full-automatic test of the frequency response characteristic of the receiving antenna and improve the test efficiency.
The invention can quickly complete the design of the receiving antenna with customized frequency response characteristic by matching with the receiving antenna with adjustable frequency response characteristic invented by the Seinuo corporation.
Drawings
FIG. 1 is a schematic diagram of an automatic test system according to the present invention.
FIG. 2 is a schematic diagram of a structure of a receiving antenna with adjustable frequency response
FIG. 3 is a top view of a C-shaped folded lug of the receiving antenna
Reference numerals 1-hoisting rod, 2-tail cable, 3-iron chuck, 4-iron core, 5-induction coil assembly, 6-plastic shell, 7-filler and 8-positioning shell
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist the skilled person in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that, for the person skilled in the art, many variations and modifications are possible without departing from the inventive concept, which falls within the scope of the invention.
Referring to fig. 1, the automatic test system of the present invention is composed of a main control unit, a lock-in amplifier unit, a current collection unit, a test system host and a test bench.
The main control unit is a control core of the test system, performs information transmission with the phase-locked amplifier unit and the current acquisition unit in a wired or wireless mode, sends a control command and receives acquisition data. The main control unit provides a man-machine interaction interface, so that a tester can conveniently set test parameters and display the test progress and the test result to the tester. The test parameters have expected frequency response characteristics, test times and the like. The expected frequency response of the receiving antenna can be the frequency response meeting the standard requirements, and can also be a self-defined frequency response, which is the relation between a group of expected track circuit currents and the induced voltage of the receiving antenna. The main control unit automatically collects and analyzes historical test data to establish a target driving type adjusting means database on the basis of a plurality of adjusting means of receiving antenna frequency response characteristics, and intelligently recommends an optimized receiving antenna design model.
The phase-locked amplifier unit adopts a phase-locked amplification technology and can perform ultra-narrow-band demodulation on specific frequency signals. The phase-locked amplification technology is a technology for carrying out phase-sensitive detection on an alternating current signal, and the phase-locked amplification technology utilizes a reference signal which has the same frequency and phase relation with a detected signal as a comparison reference, only responds to noise components of the detected signal and the reference signal which have the same frequency (or frequency multiplication) and the same phase, can greatly inhibit useless noise and improve the detection signal-to-noise ratio. The phase-locked amplifier unit receives a control command of the main control unit, generates a test driving signal and outputs the test driving signal to the test system host, and meanwhile, the phase-locked amplifier unit receives a receiving antenna induced voltage signal output by the test host.
The current acquisition unit adopts a high-precision voltmeter, measures two paths of voltage acquisition signals output by a driving module in the test system host, and outputs a measurement result to the main control unit.
The test system host comprises a driving module and a signal acquisition module. The driving module is used for amplifying the power of the test driving signal output by the phase-locked amplifier unit and driving a steel rail in the test rack to generate a current signal of the track circuit to be tested after passing through the high-precision resistor. Meanwhile, the driving module provides the current acquisition unit with test points at two ends of the high-precision resistor for the current acquisition unit to measure voltage values at two ends of the high-precision resistor. The signal acquisition module has the function of performing impedance matching with the tested receiving antenna and outputting the induced voltage signal of the receiving antenna to the phase-locked amplifier unit.
The test bench comprises a steel rail and a receiving coil hoisting frame. The length of each steel rail is 4 meters, the steel rails are arranged in parallel, and the distance between the steel rails is 1435 mm. The receiving coil hoisting frame is used for hoisting the receiving antenna to be tested above the two steel rails, and the distance between the lower surface of the receiving antenna and the rail surface of the steel rail can be adjusted.
The working process of the automatic test system comprises system calibration and test execution. The system calibration comprises the steps of placing and connecting all parts of the test system after the test environment is determined, testing and obtaining a group of data of track circuit current signals meeting the requirements generated at each test frequency point under the current environment according to the set expected frequency response characteristic, and carrying out parameterized storage so as to carry out rapid batch test. If the test environment changes or the expected frequency response characteristic changes, the system calibration needs to be carried out again so as to ensure the accuracy of the test. The test execution is to perform frequency response characteristic test on the locomotive signal receiving antenna to be tested.
And (3) system calibration process: firstly, the main control unit calculates default system calibration data according to expected frequency response characteristics, and outputs a first test frequency point, namely 25Hz signal frequency information and signal intensity information to the phase-locked amplification unit, wherein the signal intensity is UOutput of. The phase-locked amplifying unit generates signals with corresponding frequency and intensity according to the received control command and outputs the signals to the test system host. And a driving module in the test system host amplifies the signals, and outputs the signals to the steel rail in the test bench after passing through the high-precision resistor. Two channels of the current acquisition unit respectively acquire voltage values U at two ends of a high-precision resistor in a host driving module of the test systemaAnd UbAnd the data is output to the main control unit. The main control unit calculates the current intensity I in the current steel rail according to ohm's lawCollecting＝|Ua-UbI/r (r is the resistance value of the high-precision resistor) and the current intensity I specified by the test frequency point standardStandard of meritMaking a comparison if ICollectingAnd IStandard of meritIf the sizes are equal, the signal intensity U of the current test frequency point is obtainedOutput ofNo adjustment is required. If ICollectingGreater or less than IStandard of meritIf the signal intensity of the current test frequency point needs to be reduced or increased, the adjusted signal intensity is as follows: u shapeOutput of×(1+(IStandard of merit-ICollecting)/IStandard of merit). And finally, replacing the signal intensity of the test frequency point in the calibration data of the system with the adjusted signal intensity, namely completing the calibration of the test frequency point. According to the process, all the test frequency points are calibrated, namely the system calibration process is completed, and system calibration data are obtained.
When the test is carried out, firstly, the locomotive signal receiving antenna to be tested is hoisted on the hoisting frame of the test bench, and the output port of the receiving antenna is connected to the signal acquisition interface of the test system host. And the main control unit controls the phase-locked amplification unit to sequentially send the track circuit current signals of the test frequency points according to the system calibration data. And the phase-locked amplifying unit receives the voltage signal induced by the receiving antenna, performs phase-locked amplification according to the test frequency point information and removes useless interference signals. The processed signals are output to the main control unit for displaying and recording. And after the test of all the test frequency points is finished, automatically generating a test report.
According to the process, the frequency response characteristic test of the receiving antenna can be automatically completed according to the set test parameters, so that manual operation is reduced, and the test efficiency is improved.
The invention can not only complete the test of the frequency response characteristic of the receiving antenna, but also provide an optimized reference model for the design of the frequency response characteristic of the receiving antenna. The automatic test system is based on multiple frequency response characteristic adjusting means, combines historical test data, performs statistical analysis on design parameters (namely specific use conditions and degrees of each adjusting means) of a receiving antenna tested each time and frequency response characteristic test results to obtain the relationship between the use degree of each adjusting means and the frequency response characteristics of the receiving antenna, establishes a target driving type adjusting database, and can intelligently recommend an adjusting scheme for optimizing the frequency response characteristics by taking expected frequency response characteristics set by a user as a target. This function needs to be implemented by matching with a receiving antenna with adjustable frequency response designed by the company of sony corporation (the invention of the antenna with adjustable frequency response is filed on the same day as this application). The receiving antenna adopts the design of adjustable frequency response characteristic, and realizes the change of the frequency response characteristic of the receiving antenna by adjusting the parameters of all parts in the receiving antenna, so that the frequency response characteristic of the receiving antenna meets the expectation. The test system compares the difference between the expected frequency response characteristic set by the user and the actual test frequency response characteristic, and recommends a receiving coil optimization model (including the adjustable parameters of the receiving antenna quantified at the current test stage) to the user according to the adjustment means fed back by the adjustment database.
The receiving antenna comprises a hoisting rod 1, a tail cable 2, an iron clamping head 3, an iron core 4, an induction coil assembly 5, a plastic shell 6, a filler 7, a positioning shell 8 and the like, and the structure of the receiving antenna is shown in figure 2. The induction coil assembly 5 is wound on the framework by an enameled wire according to a certain number of turns and then fixed on the iron core 4 sleeved with the positioning shell 8 according to a certain distance, and iron clamping heads 3 are arranged at two ends of the iron core 4 to play a role in fixing the iron core 4 and the hoisting rod 1. The lead of the induction coil assembly 5 is connected to the tail cable 2 as an external signal interface of the receiving antenna. Then, the mixture was put into a plastic case 6, and subjected to potting and sealing treatment using a filler 7.
The means for adjusting the frequency response of the receiving antenna comprises:
1) adjusting the material composition of the composite iron core and adjusting the relative position of the induction coil and the iron core. For example, in a test, the system finds that the silicon steel sheet is added, so that the high-frequency band frequency response characteristic can be improved, and the low-frequency band frequency response characteristic can be inhibited; the iron sheet is added, so that the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be inhibited; the frequency response characteristic of the full frequency band is suppressed as the induction coil is closer to two ends of the iron core, and the frequency response characteristic of the full frequency band is improved as the induction coil is closer to the center.
2) The width of the iron chuck is adjusted. The wider the iron chuck is, the higher the frequency response characteristic of the low frequency band can be improved, and the frequency response characteristic of the high frequency band can be inhibited.
3) The C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron chuck, and referring to fig. 3, the method can improve the frequency response characteristic of the high frequency band.
The automatic test system of the invention compares the difference between the frequency response characteristic obtained by the current test and the expected frequency response characteristic and provides a quantitative regulation scheme according to the regulation means. After the adjustment is finished, the automatic test system can quickly finish the frequency response characteristic test so as to verify whether the adjusted frequency response characteristic of the receiving antenna meets the expectation. If the expectation is not met, further optimization adjustment of the frequency response characteristics of the receiving antenna can be continued through the optimization model recommended by the automatic test system until the expectation is met. Compared with the existing receiving antenna test system, the automatic test system is specially designed for the frequency response characteristic test of the receiving antenna, the actual test result is compared with the expected value, further effective receiving antenna frequency response characteristic adjusting means is continuously recommended according to the optimizing model in the adjusting database, and the adjusted receiving antenna frequency response characteristic test is rapidly completed in an auxiliary mode, so that the frequency response characteristic of the tested receiving antenna can be rapidly converged to the target value.
The invention has the technical advantages that:
1) the test system can inhibit useless noise, ensure that the frequency response characteristic test of the receiving antenna is finished under the complex electrical environment condition, and improve the usability and the test accuracy of the test system.
2) The test system can automatically complete the frequency response characteristic test of the receiving antenna, record and analyze the test result, output the test report and improve the test efficiency.
3) The test system can intelligently recommend the optimized receiving antenna design model, effectively shorten the design period of the receiving antenna and improve the efficiency.
The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described, and it is intended that various modifications, changes, and substitutions be included within the scope of the claims which are regarded as being equivalent thereto.
Claims (8)
1. An automatic test system for the frequency response characteristics of a locomotive signal receiving antenna, which consists of a main control unit, a phase-locked amplifier unit, a current acquisition unit, a test system host and a test bench,
the test bench is composed of steel rails and a receiving coil hoisting frame, the receiving coil hoisting frame is used for hoisting a receiving antenna to be tested above the two steel rails, and the distance between the lower surface of the receiving antenna and the rail surface of the steel rails can be adjusted;
the test system host comprises a driving module and a signal acquisition module, wherein the driving module is used for amplifying the power of a test driving signal output by the phase-locked amplifier unit, driving a steel rail in a test rack to generate a track circuit current signal to be tested after passing through a high-precision resistor, and simultaneously providing test points at two ends of the high-precision resistor for the current acquisition unit to measure the voltage values at two ends of the high-precision resistor; the signal acquisition module is in impedance matching with the tested receiving antenna and outputs an induced voltage signal of the receiving antenna to the phase-locked amplifier unit;
the main control unit is a control core of the automatic test system, performs information transmission with the lock-in amplifier unit and the current acquisition unit in a wired or wireless mode, sends a control command and receives acquired data;
the phase-locked amplifier unit adopts a phase-locked amplification technology, can perform ultra-narrow band demodulation on a specific frequency signal, and inhibits useless noise; the phase-locked amplifier unit receives a control command of the main control unit, generates the test driving signal and outputs the test driving signal to the test system host, and meanwhile, the phase-locked amplifier unit receives a receiving antenna induced voltage signal output by the test system host;
the current acquisition unit adopts a high-precision voltmeter, measures two paths of voltage acquisition signals output by the driving module in the test system host, and outputs a measurement result to the main control unit;
the automatic test system can automatically complete the frequency response characteristic test of the receiving antenna, record and analyze the test result and output a test report; and an optimized reference model can be provided for the frequency response characteristic design of the receiving antenna.
2. The automatic test system of claim 1, wherein the operation of the automatic test system includes system calibration and test execution;
the system calibration comprises the steps of placing and connecting all parts of the automatic test system after the test environment is determined, testing and obtaining a group of data of track circuit current signals meeting the requirements generated at each test frequency point under the current environment according to the set expected frequency response characteristic, and carrying out parameterized storage so as to carry out rapid batch test; if the test environment changes or the expected frequency response characteristic changes, the system calibration needs to be carried out again.
3. The automatic test system of claim 2, wherein during the test, the locomotive signal receiving antenna to be tested is firstly hung on the hanging frame of the test bench, and the output port of the receiving antenna is connected to the signal acquisition interface of the test system host; the main control unit controls the phase-locked amplification unit to sequentially send track circuit current signals of all the test frequency points according to system calibration data; the phase-locked amplifying unit receives the voltage signal induced by the receiving antenna, performs phase-locked amplification according to the test frequency point information and removes useless interference signals; the processed signals are output to the main control unit for displaying and recording; and after the test of all the test frequency points is finished, automatically generating a test report.
4. The automatic test system of claim 3, wherein the automatic test system is based on a plurality of frequency response characteristic adjustment means, combines historical test data, obtains the relationship between the use degree of each adjustment means and the frequency response characteristic of the receiving antenna by performing statistical analysis on the design parameters of the receiving antenna and the frequency response characteristic test result of each test, establishes a target-driven type adjustment database, and intelligently recommends the optimized reference model of the frequency response characteristic adjustment means with the expected frequency response characteristic set by a user as a target.
5. The automatic test system of claim 4, wherein the receiving antenna is designed to be adjustable in frequency response, and the change of the frequency response of the receiving antenna is realized by adjusting parameters of each component in the receiving antenna, so that the frequency response of the receiving antenna meets the expectation; and the automatic test system compares the difference between the expected frequency response characteristic set by the user and the actual test frequency response characteristic, and recommends the optimized reference model of the receiving antenna design to the user according to the adjusting means fed back by the adjusting database, wherein the optimized reference model comprises the adjustable parameters of the receiving antenna quantified in the current test stage.
6. The automatic test system according to claim 4 or 5, wherein the receiving antenna is composed of a hoisting rod, a tail cable, iron clamps, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell, the induction coil assembly is formed by winding an enameled wire on a framework according to a certain number of turns and then fixing the enameled wire on the iron core sleeved with the positioning shell according to a certain distance, and the iron clamps are arranged at two ends of the iron core and play roles of fixing the iron core and the hoisting rod; the lead of the induction coil assembly is connected to the tail cable to serve as an external signal interface of the receiving antenna, then the tail cable is arranged in the plastic shell, and filling and sealing treatment is carried out by using fillers;
the frequency response characteristic adjusting means includes: adjusting the material composition of the composite iron core and the relative position of the induction coil and the iron core; adjusting the width of the iron chuck; the C-shaped folding lugs made of silicon steel sheets are additionally arranged on two sides of the iron chuck.
7. The automatic test system of claim 6, wherein the addition of silicon steel sheets can improve the frequency response characteristic of the high frequency band and suppress the frequency response characteristic of the low frequency band; the iron sheet is added, so that the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be inhibited; the frequency response characteristic of the full frequency band is inhibited the closer the induction coil is to the two ends of the iron core, and the frequency response characteristic of the full frequency band is improved the closer the induction coil is to the center; the wider the iron chuck is, the higher the frequency response characteristic of the low frequency band can be improved, and the frequency response characteristic of the high frequency band can be inhibited; the high-frequency band frequency response characteristic can be improved by adding the folding lug.
8. The automatic test system of claim 7, wherein the automatic test system compares the difference between the frequency response obtained from the current test and the expected frequency response, and provides a quantitative adjustment scheme based on the frequency response adjustment means;
after the parameters of the receiving antenna are adjusted, the automatic test system is used for quickly completing the frequency response characteristic test so as to verify whether the adjusted frequency response characteristic of the receiving antenna meets the expectation; and if the expectation is not met, the automatic test system continuously recommends the optimized reference model to further adjust the frequency response characteristic of the receiving antenna until the expectation is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680372.XA CN114325134B (en) | 2021-12-30 | Automatic test system for frequency response characteristics of locomotive signal receiving antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680372.XA CN114325134B (en) | 2021-12-30 | Automatic test system for frequency response characteristics of locomotive signal receiving antenna |
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| Publication Number | Publication Date |
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| CN114325134A true CN114325134A (en) | 2022-04-12 |
| CN114325134B CN114325134B (en) | 2024-05-31 |
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|---|---|---|---|---|
| US20040113854A1 (en) * | 2002-10-01 | 2004-06-17 | Heinz Lindenmeier | Active broad-band reception antenna with reception level regulation |
| DE102008040898A1 (en) * | 2007-08-29 | 2009-03-05 | Agilent Technologies Inc., Santa Clara | Channel measuring system for wireless multi-input-multi output data transmission system, has synchronization sub-system producing transmitter and receiver starting signals that are synchronous to each other |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113854A1 (en) * | 2002-10-01 | 2004-06-17 | Heinz Lindenmeier | Active broad-band reception antenna with reception level regulation |
| DE102008040898A1 (en) * | 2007-08-29 | 2009-03-05 | Agilent Technologies Inc., Santa Clara | Channel measuring system for wireless multi-input-multi output data transmission system, has synchronization sub-system producing transmitter and receiver starting signals that are synchronous to each other |
| CN109150769A (en) * | 2017-06-13 | 2019-01-04 | 华为技术有限公司 | Method and apparatus for channel estimation |
| CN112134630A (en) * | 2020-09-28 | 2020-12-25 | 北京交大思诺科技股份有限公司 | BTM production detecting system |
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