CN114325134B - Automatic test system for frequency response characteristics of locomotive signal receiving antenna - Google Patents
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Abstract
The automatic test system for the frequency response characteristics 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 test of the frequency response characteristics of the receiving antenna, record and analyze the test result and output a test report; it is also possible to provide an optimized reference model for the design of the frequency response 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 measurement accuracy; 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 receiving antenna with the adjustable frequency response characteristic is matched, so that the design of the receiving antenna with the customized frequency response characteristic can be rapidly completed.
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 component for receiving the track circuit signals by locomotive signal on-board system equipment and a Track Circuit Reader (TCR), and has a great number of applications in the China railway industry. The locomotive signal receiving antenna receives the current signal of the track circuit in the steel rail through the electromagnetic induction principle, converts the current signal into a voltage signal and outputs the voltage signal to the vehicle-mounted host machine for decoding. The main technical parameters of the receiving antenna are direct current resistance, inductance, quality factor and frequency response characteristic, which are specified in TB/T3287-2013 locomotive signal vehicle-mounted system equipment. The frequency response characteristic of the receiving antenna refers to the relation between the magnitude of a current signal of a track circuit in a steel rail and the magnitude of an induced voltage signal of the receiving antenna.
A standard test method for the frequency response characteristic of the receiving antenna is provided in TB/T3287-2013 locomotive signal vehicle-mounted system equipment. The testing method is that the current signal of the track circuit with fixed size is sent to two parallel long steel rails with the length of 4 meters, and the voltage signal induced by the receiving antenna is tested. The number of the frequency points to be tested is 9, namely 25Hz, 550Hz, 650Hz, 750Hz, 850Hz, 1700Hz, 2000Hz, 2300Hz and 2600Hz, and the track circuit current of each frequency point is different. When the frequency response characteristic of the receiving antenna is tested at present, the signal generator, the power amplifier, the ammeter, the voltmeter and other equipment are adopted, the current is required to be manually adjusted, and the measured data is read and recorded, so that the device has the defects of low testing efficiency, low measuring precision and the like.
With technological advancement and social development, electrical and electronic equipment is ubiquitous, which causes a large amount of electromagnetic interference in space, so that when a receiving antenna frequency response characteristic test is performed, the receiving antenna frequency response characteristic test is extremely susceptible to interference, and a test result is inaccurate.
Along with the wider and wider application range of the receiving antenna, the receiving antenna covers various application scenes such as large iron, subways, inter-city railways and the like, and the demand of the receiving antenna is not limited to the frequency response characteristic meeting the standard requirement, but different frequency response characteristic demands are provided for various application scenes. There is no receiving antenna with adjustable frequency response characteristics and a matched test system.
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 consists of steel rails and a receiving coil lifting frame, wherein the receiving coil lifting frame is used for lifting a receiving antenna to be tested above the two steel rails and can adjust the distance between the lower surface of the receiving antenna and the rail surface of the steel rails;
The test system host comprises a driving module and a signal acquisition module, wherein the driving module is used for amplifying power of a test driving signal output by the lock-in amplifier unit, driving a steel rail in the test bench to generate a track circuit current signal to be tested after passing through the high-precision resistor, and simultaneously providing 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 performs impedance matching with a receiving antenna to be tested, and outputs an induced voltage signal of the receiving antenna to the lock-in 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 acquisition data;
The phase-locked amplifier unit adopts a phase-locked amplification technology, can perform ultra-narrow band demodulation on a specific frequency signal, and can inhibit useless noise; the phase-locked amplifier unit receives the 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 the antenna induction voltage signal output by the test system host;
the current acquisition unit adopts a high-precision voltmeter to measure two paths of voltage acquisition signals output by the driving module in the test system host and output measurement results to the main control unit;
the automatic test system can automatically complete the test of the frequency response characteristics of the receiving antenna, record and analyze the test result and output a test report; it is also possible to provide an optimized reference model for the design of the frequency response 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 measurement accuracy.
The invention adopts an automatic control technology, can realize the full-automatic test of the frequency response characteristic of the receiving antenna and improves the test efficiency.
The invention can be matched with the receiving antenna with adjustable frequency response characteristic invented by the Conda Sino company, and the design of the receiving antenna with customized frequency response characteristic can be rapidly completed.
Drawings
FIG. 1 is a schematic diagram of an automatic test system according to the present invention.
Fig. 2 is a schematic structural diagram of an adjustable frequency response receiving antenna
FIG. 3 is a top view of a "C" shaped folded ear of a receiving antenna
Reference numeral 1-lifting rod, 2-tail cable, 3-iron clamp, 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 it is possible for a person skilled in the art to make several variations and modifications without departing from the inventive concept, which fall within the scope of protection of the present 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 acquisition 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 lock-in 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, which is convenient for testers to set test parameters and displays test progress and test results to the testers. The test parameters have expected frequency response characteristics, test times and the like. The expected frequency response characteristic of the receiving antenna can be the frequency response characteristic meeting the standard requirement, can also be the self-defined frequency response characteristic, and is a group of expected relations between the track circuit current and the induction 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 based on adjusting means of various receiving antenna frequency response characteristics, and intelligently recommends an optimized receiving antenna design model.
The phase-locked amplifier unit adopts phase-locked amplification technology and can perform ultra-narrow band demodulation on signals with specific frequencies. The phase-locked amplifying technology is a phase-sensitive detection technology for AC signals, and uses a reference signal with the same frequency and phase relation with the detected signal as a comparison standard, and only responds to noise components with the same frequency (or frequency multiplication) and the same phase of the detected signal and the reference signal, thereby greatly inhibiting the unwanted noise and improving the detection signal to noise ratio. The phase-locked amplifier unit receives the 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 the antenna induction voltage signal output by the test host.
The current acquisition unit adopts a high-precision voltmeter to measure two paths of voltage acquisition signals output by a driving module in a host computer of the test system and output measurement results 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 lock-in amplifier unit, and driving the steel rail in the test bench to generate a track circuit current signal to be tested after passing through the high-precision resistor. Meanwhile, the driving module provides 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 used for performing impedance matching with the receiving antenna to be tested and outputting an induced voltage signal of the receiving antenna to the lock-in amplifier unit.
The test bench consists of a steel rail and a receiving coil lifting frame. The number of the steel rails is two, each steel rail has the length of 4 meters and is placed in parallel, and the distance is 1435mm. The receiving coil lifting frame is used for lifting 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 rails can be adjusted.
The working process of the automatic test system comprises system calibration and test execution. The system calibration is that after the test environment is determined, the system calibration comprises the steps of placing and connecting all components of the test system, testing and obtaining a group of data of the current signals of the track circuit meeting the requirements at all test frequency points under the current environment according to the set expected frequency response characteristics, and carrying out parameterization 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 test the frequency response characteristic of the receiving antenna of the locomotive signal to be tested.
The system calibration process comprises the following steps: the method comprises the steps of firstly, calculating default system calibration data according to expected frequency response characteristics by a main control unit, and outputting signal frequency information and signal strength information of a first test frequency point, namely 25Hz, to a phase-locked amplifying unit, wherein the signal strength is U Output of . And 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. The 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. The two channels of the current acquisition unit respectively acquire voltage values U a and U b at two ends of a high-precision resistor in a host driving module of the test system, and output the voltage values to the main control unit. The main control unit calculates the current intensity I Acquisition of ＝|Ua-Ub/r (r is the resistance value of the high-precision resistor) in the current steel rail according to ohm's law, compares the current intensity I standard of specified by the test frequency point standard, and if the magnitudes of I Acquisition of and I standard of are equal, the signal intensity U Output of of the current test frequency point does not need to be adjusted. If I Acquisition of is greater than or less than I standard of , the signal strength of the current test frequency needs to be reduced or increased, and the adjusted signal strength is: u Output of ×(1+(I standard of -I Acquisition of )/I standard of ). And finally, replacing the signal intensity of the test frequency point in the system calibration data with the adjusted signal intensity, thereby completing the calibration of the test frequency point. And calibrating all the test frequency points according to the process, namely completing the system calibration process and obtaining system calibration data.
When the test is executed, firstly, the locomotive signal receiving antenna to be tested is hung on the hanging rack of the test rack, 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 amplifying unit to sequentially send track circuit current signals of all 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 display and recording. And automatically generating a test report after all the test frequency points are tested.
According to the process, the invention can automatically complete the test of the frequency response characteristic of the receiving antenna according to the set test parameters, reduces manual operation and improves the test efficiency.
The invention can complete the frequency response characteristic test of the receiving antenna and can provide an optimized reference model for the frequency response characteristic design of the receiving antenna. The automatic test system is based on various frequency response characteristic adjusting means, combines historical test data, performs statistical analysis on design parameters (namely specific use conditions and degrees of the adjusting means) of the receiving antenna and frequency response characteristic test results of each test to obtain the relation between the use degree of each adjusting means and the frequency response characteristic of the receiving antenna, establishes a target driving type adjusting database, and can intelligently recommend an optimal adjusting scheme of the frequency response characteristic by taking the expected frequency response characteristic set by a user as a target. This function is implemented by matching with a receiving antenna designed by the company of samsuno and having adjustable frequency response characteristics. The receiving antenna adopts the design with adjustable frequency response characteristics, and the parameters of all components in the receiving antenna are adjusted to change the frequency response characteristics of the receiving antenna so that the frequency response characteristics of the receiving antenna meet the expectations. 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 (comprising the adjustable parameters of the receiving antenna quantified in the current test stage) to the user according to the adjustment means fed back by the adjustment database.
The receiving antenna consists of 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 enameled wires according to a certain number of turns, then fixed on the iron core 4 sleeved with the positioning shell 8 according to a certain interval, iron chucks 3 are arranged at two ends of the iron core 4, and the effects of fixing the iron core 4 and lifting the rod 1 are achieved. The lead wire of the induction coil assembly 5 is connected to the tail cable 2 as a receiving antenna interface for external signals. Then the plastic shell 6 is filled, and the filling 7 is used for sealing and sealing.
The means for adjusting the frequency response characteristics of the receiving antenna include:
1) And adjusting the material composition of the composite iron core and the relative position of the induction coil and the iron core. For example, in the system, the test shows that the silicon steel sheet is added to improve the high-frequency band response characteristic and inhibit the low-frequency band response characteristic; 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 restrained; the frequency response characteristic of the full frequency band is restrained as the induction coil is closer to the 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) And adjusting the width of the iron clamp head. The wider the iron clamping head is, the better the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be restrained.
3) The C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron clamping head, and referring to fig. 3, the method can improve the high-frequency band frequency response characteristic.
The automatic test system of the invention compares the gap between the frequency response characteristic obtained by the current test and the expected frequency response characteristic, and gives a quantitative adjustment scheme according to the adjustment means. After the adjustment is finished, the automatic test system can be used for rapidly finishing the frequency response characteristic test so as to verify whether the adjusted frequency response characteristic of the receiving antenna meets the expectations. If the expected frequency response characteristics still do not meet the expected frequency response characteristics, the method can continue to optimally adjust the frequency response characteristics of the receiving antenna further through an optimization model recommended by the automatic test system until the expected frequency response characteristics meet the expected frequency response characteristics. 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, compares the actual test result with the expected value, continuously recommends a further effective receiving antenna frequency response characteristic regulating means according to the optimizing model in the regulating database, and rapidly assists in completing the regulated receiving antenna frequency response characteristic test, 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 test of the frequency response characteristic 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 test of the frequency response characteristics of the receiving antenna, record and analyze the test result, output a test report and improve the test efficiency.
3) The test system can intelligently recommend an optimized receiving antenna design model, effectively shortens the receiving antenna design period and improves 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 recognized that various modifications, alterations, and substitutions are possible, and they are intended to be included within the scope of the claims, which follow.
Claims (8)
1. An automatic test system for the frequency response characteristics of a 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,
The test bench consists of steel rails and a receiving coil lifting frame, wherein the receiving coil lifting frame is used for lifting a receiving antenna to be tested above the two steel rails and can adjust the distance between the lower surface of the receiving antenna and the rail surface of the steel rails;
The test system host comprises a driving module and a signal acquisition module, wherein the driving module is used for amplifying power of a test driving signal output by the lock-in amplifier unit, driving a steel rail in the test bench to generate a track circuit current signal to be tested after passing through the high-precision resistor, and simultaneously providing 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 performs impedance matching with a receiving antenna to be tested, and outputs an induced voltage signal of the receiving antenna to the lock-in 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 acquisition data;
The phase-locked amplifier unit adopts a phase-locked amplification technology, can perform ultra-narrow band demodulation on a specific frequency signal, and can inhibit useless noise; the phase-locked amplifier unit receives the 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 the antenna induction voltage signal output by the test system host;
the current acquisition unit adopts a high-precision voltmeter to measure two paths of voltage acquisition signals output by the driving module in the test system host and output measurement results to the main control unit;
the automatic test system can automatically complete the test of the frequency response characteristics of the receiving antenna, record and analyze the test result and output a test report; it is also possible to provide an optimized reference model for the design of the frequency response of the receiving antenna.
2. The automated test system of claim 1, wherein the operation of the automated test system comprises system calibration and test execution;
After the test environment is determined, the system calibration comprises the steps of placing and connecting all components of the automatic test system, testing and obtaining a group of data of the current signals of the track circuit meeting the requirements at all test frequency points under the current environment according to the set expected frequency response characteristics, and carrying out parameterization storage so as to be capable of carrying out rapid batch test; if the test environment changes or the expected frequency response characteristics change, the system calibration needs to be carried out again.
3. The automatic test system of claim 2 wherein during test execution, first hoisting the cab signal receiving antenna to be tested on a hoisting frame of the test bench, and connecting an output port of the receiving antenna to a signal acquisition interface of the test system host; the main control unit controls the phase-locked amplifying 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 display and recording; and automatically generating a test report after all the test frequency points are tested.
4. The automatic test system of claim 3 wherein said automatic test system is based on a plurality of frequency response characteristic adjustment means, and by combining historical test data, obtaining a relationship between the degree of use of each adjustment means and the frequency response characteristic of the receiving antenna by statistically analyzing the design parameters of the receiving antenna and the frequency response characteristic test results of each test, creating a target-driven adjustment database, and intelligently recommending said optimized reference model of the frequency response characteristic adjustment means with respect to said expected frequency response characteristic set by the user.
5. The automatic test system of claim 4 wherein the receiving antenna is of an adjustable frequency response design, and wherein the change in the frequency response of the receiving antenna is achieved by adjusting parameters of components within the receiving antenna such that the frequency response of the receiving antenna meets expectations; 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 adjustment means fed back by the adjustment database, wherein the optimized reference model comprises the quantified adjustable parameters of the receiving antenna in the current test stage.
6. The automatic test system of claim 4 or 5, wherein the receiving antenna is composed of a lifting rod, a tail cable, an iron clamp, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell, wherein the induction coil assembly is wound on a framework by enameled wires according to a certain number of turns and then fixed on the iron core sleeved with the positioning shell according to a certain interval, and the iron clamp is arranged at two ends of the iron core to play a role of fixing the iron core and the lifting rod; the lead wire of the induction coil assembly is connected to the tail cable to be used as an external signal interface of the receiving antenna, and then the tail cable is arranged in a plastic shell, and filling, sealing and sealing treatment are carried out by using a filler;
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 an iron chuck; the C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron clamping head.
7. The automatic test system of claim 6 wherein adding a sheet of silicon steel increases the high-band frequency response and suppresses the low-band frequency response; 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 restrained; the induction coil is closer to the two ends of the iron core to inhibit the frequency response characteristic of the full frequency band, and is closer to the center to improve the frequency response characteristic of the full frequency band; the wider the iron clamping head is, the better the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be restrained; the folded lug is added, so that the high-frequency band frequency response characteristic can be improved.
8. The automatic test system of claim 7 wherein said automatic test system compares the gap between the frequency response characteristic obtained from the current test and the expected frequency response characteristic, and provides a quantitative adjustment scheme based on said frequency response characteristic adjustment means;
After the receiving antenna parameters are adjusted, the automatic test system is used for rapidly completing the frequency response characteristic test so as to verify whether the adjusted receiving antenna frequency response characteristic meets the expectations; if the expectations are not met, continuing to recommend further adjustments to the receive antenna frequency response characteristics by the automatic test system to the optimized reference model until the expectations are met.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10245813A1 (en) * | 2002-10-01 | 2004-04-15 | Lindenmeier, Heinz, Prof. Dr.-Ing. | Active broadband reception antenna with reception level control |
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| 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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