CN113517937B - Test method and system - Google Patents

Test method and system Download PDF

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Publication number
CN113517937B
CN113517937B CN202110799846.6A CN202110799846A CN113517937B CN 113517937 B CN113517937 B CN 113517937B CN 202110799846 A CN202110799846 A CN 202110799846A CN 113517937 B CN113517937 B CN 113517937B
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signal
transponder
tested
preset
frequency
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CN113517937A (en
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王通
叶轲
朱林富
孙亮
张�诚
连乐
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Beijing Railway Signal Co Ltd
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Beijing Railway Signal Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/59—Responders; Transponders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The application provides a testing method and a testing system, which are used for adjusting initial amplitude and determining target amplitude; testing the transponder to be tested by using the excitation signal edited by the target amplitude; acquiring a time domain signal in a downlink signal fed back by a transponder to be tested; and when the frequency spectrum of the time domain signal is determined to contain a frequency shift keying FSK signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes. In the scheme, the transponder to be tested is tested by using the excitation signal edited by the adjusted target amplitude, so as to obtain the downlink signal fed back after the transponder to be tested is started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.

Description

Test method and system
Technical Field
The present application relates to the field of data processing technologies, and in particular, to a testing method and system.
Background
The transponder is a positioning device in a train control system, and is a device for realizing high-speed point type data transmission between the ground and the vehicle-mounted device at a specific place.
When the train passes, the transponder vehicle-mounted antenna at the bottom of the train head sends an excitation radio frequency signal to the ground transponder of the line steel rail. After receiving the signal, the ground transponder converts the signal into a working power supply to start, and transmits an uplink signal to a transponder vehicle-mounted antenna at the bottom of the train head. Because the speed of the train passing through the steel rail is extremely high, and the communication range of the ground transponder and the vehicle-mounted antenna is small, if the ground transponder is started slowly after receiving the downlink excitation signal sent by the vehicle-mounted antenna, the information quantity of the downlink excitation signal transmission is reduced, and the problems of signal-to-noise ratio reduction and information transmission failure can occur.
Therefore, how to provide a testing method, which tests the starting time of the transponder in the design stage and the production and manufacturing stage of the transponder, so as to prevent the ground transponder from being started slowly in practical application, thereby reducing the information quantity of the downlink excitation signal transmission and causing the problems of signal-to-noise ratio reduction and information transmission failure.
Disclosure of Invention
In view of the above, the embodiments of the present application provide a testing method and system, so as to solve the problems in the prior art that the information amount of the downlink excitation signal transmission is reduced, and the signal-to-noise ratio is reduced and the information transmission fails.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
a first aspect of an embodiment of the present application shows a test method, the method including:
adjusting the initial amplitude to determine a target amplitude;
testing the transponder to be tested by utilizing the excitation signal edited by the target amplitude;
acquiring a time domain signal in a downlink signal fed back by the transponder to be tested;
when the frequency spectrum of the time domain signal is determined to contain a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested is passed, wherein the frequency spectrum of the time domain signal is obtained by carrying out Fourier transform on the time domain signal.
Optionally, the adjusting the initial amplitude to determine the target amplitude includes:
transmitting the excitation signal with the initial amplitude to a transponder to be tested, and acquiring the actual input power of the transponder to be tested measured by a power meter;
determining whether the initial amplitude meets a preset boundary range according to the actual input power and a preset test power;
if yes, setting the initial amplitude as a target amplitude;
if the initial amplitude is not met, the initial amplitude is adjusted according to the preset offset, and the step of sending the excitation signal of the initial amplitude to the transponder to be tested and obtaining the actual input power of the transponder to be tested measured by the power meter is returned.
Optionally, the determining whether the initial amplitude meets the preset boundary range according to the actual input power and the preset test power includes:
calculating the difference between the actual input power and the preset test power to obtain a first difference value;
judging whether the absolute value of the first difference value is smaller than a preset boundary range or not;
if the initial amplitude is smaller than the target amplitude, setting the initial amplitude as the target amplitude;
if the power is greater than or equal to the preset offset, the initial amplitude is adjusted according to the preset offset, and the step of sending the excitation signal of the initial amplitude to the transponder to be tested and acquiring the actual input power of the transponder to be tested, which is measured by a power meter, is performed.
Optionally, when determining that the frequency spectrum of the time domain signal includes a frequency shift keying FSK signal with a preset frequency and a preset frequency offset, determining that the test of the transponder to be tested passes includes:
performing Fourier transform on the time domain signal to obtain a frequency spectrum of the time domain signal;
judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset;
if the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes;
and if the frequency spectrum of the time domain signal does not contain the frequency shift keying FSK signal with the preset frequency and the preset frequency offset, determining that the test of the transponder to be tested is not passed.
A second aspect of an embodiment of the present application shows a test system, the system comprising: a signal generator, a test antenna and a spectrometer;
the signal generator is connected with the test antenna, the test antenna is connected with the transponder to be tested, and the test antenna is connected with the spectrometer;
the signal generator is used for adjusting the initial amplitude and determining the target amplitude; testing the transponder to be tested by utilizing the excitation signal edited by the target amplitude;
the frequency spectrograph is used for acquiring a time domain signal in a downlink signal fed back by the transponder to be tested through the test antenna; and determining that the test of the transponder to be tested passes when determining that the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, wherein the frequency spectrum of the time domain signal is obtained by carrying out Fourier transform on the time domain signal.
Optionally, the system further comprises a power meter;
the power meter is connected with the test antenna;
the power meter is used for measuring the actual input power of the transponder to be tested.
Optionally, the signal generator for adjusting the initial amplitude and determining the target amplitude is specifically configured to: transmitting the excitation signal with the initial amplitude to a transponder to be tested, and acquiring the actual input power of the transponder to be tested measured by the power meter; determining whether the initial amplitude meets a preset boundary range according to the actual input power and a preset test power; if yes, setting the initial amplitude as a target amplitude; if not, the initial amplitude is adjusted according to a preset offset.
Optionally, when determining that the frequency spectrum of the time domain signal includes a frequency shift keying FSK signal with a preset frequency and a preset frequency offset, determining that the to-be-tested transponder passes the test, where the determining is specifically configured to: performing Fourier transform on the time domain signal to obtain a frequency spectrum of the time domain signal; judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset; if the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes; and if the frequency spectrum of the time domain signal does not contain the frequency shift keying FSK signal with the preset frequency and the preset frequency offset, determining that the test of the transponder to be tested is not passed.
Optionally, the method further comprises: a first attenuator, a second attenuator, and a power amplifier;
one end of the first attenuator is connected with the signal generator, and the other end of the first attenuator is connected with one end of the power amplifier;
the other end of the power amplifier is connected with one end of the second attenuator, and the other end of the second attenuator is connected with the test antenna;
the first attenuator and the second attenuator are used for preventing the recharging of the excitation signal;
the power amplifier is used for amplifying the sine of the excitation signal generated by the signal generator.
Optionally, the method further comprises: a first filter, a second filter, and a pre-amplifier;
one end of the first filter is connected with the test antenna, the other end of the first filter is connected with one end of the preamplifier, one end of the preamplifier is connected with one end of the second filter, and the other end of the second filter is connected with the spectrometer;
the first filter and the second filter are both used for filtering out preset frequency signals in downlink signals;
the pre-amplifier is configured to amplify the downlink signal.
Based on the test method and system provided by the embodiment of the application, the method comprises the following steps: adjusting the initial amplitude to determine a target amplitude; testing the transponder to be tested by using the excitation signal edited by the target amplitude; acquiring a time domain signal in a downlink signal fed back by a transponder to be tested; when the frequency spectrum of the time domain signal is determined to contain a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested is passed, wherein the frequency spectrum of the time domain signal is obtained by carrying out Fourier transform on the time domain signal. In the embodiment of the application, the transponder to be tested is tested by using the excitation signal edited by the adjusted target amplitude so as to obtain the downlink signal fed back after the transponder to be tested is started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test system according to an embodiment of the present application;
FIG. 2 is a flow chart of a testing method according to an embodiment of the present application;
fig. 3 is a flow chart of another test method according to an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As known from the background art, because the vehicle-mounted antenna and the ground transponder are horizontally and relatively moved in a highly staggered manner when the train passes through the ground transponder, the distance between the ground and the vehicle is greatly changed in the moving process, and if enough information transmission quantity is required to be maintained at a higher speed and a fixed transmission speed, the starting time of the ground transponder needs to be ensured to be sufficiently short. Therefore, during the transponder design phase and during the manufacturing phase, it is necessary to test the activation time of the transponder to ensure that the activation time of the transponder is within a specified range.
In the embodiment of the application, the transponder to be tested is tested by using the excitation signal edited by the adjusted target amplitude so as to obtain the downlink signal fed back after the transponder to be tested is started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
For ease of understanding, the terms appearing in the embodiments of the application are explained below:
frequency shift keying modulation (Frequency Shift Key, FSK): the low frequency digital signal (i.e. high 1 low 0 non-periodically varying digital signal) and the high frequency sinusoidal signal (i.e. 2 high frequency sinusoidal signals are commonly used, which respectively represent 1 and 0 of the low frequency digital signal) are modulated into sinusoidal signals with alternating frequency in the time domain by a multiplier, so as to facilitate propagation in free space or transmission cable and other mediums.
Transponder Balise: a ground transmission unit using magnetic induction technology. The most important function of which is to transmit data information through the air gap. The transponder is a track mounted signal device that communicates with the vehicle device passing over it. Wherein the transponders include active transponders and passive transponders.
Vehicle-mounted antenna: means mounted at the bottom of the train for communicating with the transponder as the train passes over the ground transponder, the vehicle mounted antenna being operative to transmit a downlink excitation signal to the transponder to activate the transponder, while receiving an uplink signal transmitted outwardly after activation of the transponder.
Downstream excitation signal: the 27.095MHz sinusoidal signal carrying energy is sent by the vehicle-mounted antenna, and after receiving the energy, the transponder is started by a circuit and sends an FSK signal.
Uplink signal: a 4MHz frequency FSK signal carrying information transmitted by the transponder.
Symbol: time domain information represented by 1 high (or low) level in the digital signal. The symbol width is the time domain length of a single symbol.
Referring to fig. 1, a schematic structural diagram of a test system according to an embodiment of the present application is shown, where the system includes: a signal generator 11, a test antenna 12 and a spectrometer 13.
The signal generator 11 is connected with the test antenna 12, the test antenna 12 is connected with the transponder 10 to be tested, and the test antenna 12 is connected with the spectrometer 13.
A signal generator 11 for adjusting the initial amplitude to determine a target amplitude; and testing the transponder to be tested by using the excitation signal edited by the target amplitude.
In a specific implementation, the signal generator 11 detects the transponder 10 to be tested by using its initial amplitude to determine an optimal excitation signal, tests the transponder 10 to be tested by using the initial amplitude, and continuously adjusts the amplitude until the actual input power corresponding to the amplitude is near the preset test power, and determines that the amplitude is the target amplitude. And edits the excitation signal according to the target amplitude, and transmits the excitation signal to the transponder 10 to be tested through the test antenna so as to test the transponder 10 to be tested. So that the transponder 10 to be tested activates upon receipt of the excitation signal and feeds back the downlink signal.
The excitation signal is a signal of 150us excitation waveform.
Alternatively, the signal generator 11 transmits the excitation signal simultaneously to the spectrometer to trigger the spectrometer 13 by means of an external trigger.
A spectrometer 13 for acquiring a time domain signal from the downlink signal through the test antenna 12; and determining that the test of the transponder 10 to be tested passes when determining that the frequency spectrum of the time domain signal comprises the frequency shift keying FSK signal of the preset frequency and the preset frequency offset.
The frequency spectrum of the time domain signal is obtained by performing Fourier transform on the time domain signal.
In a specific implementation, the spectrometer 13 directly collects the downlink signal fed back by the transponder 10 to be tested through the test antenna 12 when triggered, and obtains the time domain signal sig in the downlink signal. Performing Fast Fourier Transform (FFT) on a time domain signal sig to obtain a frequency spectrum f of the time domain signal, judging whether the frequency spectrum f contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, and if so, determining that the transponder 10 to be tested is started within a set time, namely feeding back a corresponding downlink signal within the set time, namely, the transponder 10 to be tested passes the test; if not, it is determined that the transponder 10 under test is slow to start, i.e. is not able to feed back the downlink signal within the prescribed limits, i.e. the transponder 10 under test fails the test.
With continued reference to fig. 1, the test system further includes: a power meter 14, a first attenuator 15, a second attenuator 16, a power amplifier 17, a first filter 18, a second filter 19 and a pre-amplifier 20.
A power meter 14 is connected to the test antenna 12 for measuring the actual input power of the transponder 10 to be tested.
One end of the first attenuator 15 is connected to the signal generator 11, and the other end of the first attenuator 11 is connected to one end of the power amplifier 17.
The other end of the power amplifier 17 is connected to one end of the second attenuator 16, and the other end of the second attenuator 16 is connected to the test antenna 12.
The first attenuator 11 and the second attenuator 16 are each used to prevent the excitation signal from recharging.
A power amplifier 17 for amplifying the sine of the excitation signal generated by the signal generator.
One end of the first filter 18 is connected to the test antenna 11, the other end of the first filter 18 is connected to one end of the preamplifier 20, one end of the preamplifier 20 is connected to one end of the second filter 19, and the other end of the second filter 19 is connected to the spectrometer 13.
The first filter 18 and the second filter 19 are both used for filtering out a preset frequency signal in the downlink signal.
The preset frequency signal refers to a 27MHz downlink signal in the downlink signal.
A pre-amplifier 20 for amplifying the downlink signal.
In the present embodiment, the functions and characteristics of the respective components shown above are shown in table 1.
Table 1:
the first filter 18 and the second filter 19 are both low-pass filters.
The spectrometer 13, which may also be a power meter, functions to collect the power of the FSK signal.
In the embodiment of the application, the transponder to be tested is tested by using the excitation signal edited by the adjusted target amplitude so as to obtain the downlink signal fed back after the transponder to be tested is started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
Based on the test system shown in the above embodiment of the present application, the signal generator 11 for adjusting the initial amplitude and determining the target amplitude is specifically configured to: transmitting an excitation signal with initial amplitude to the transponder 10 to be tested, and acquiring actual input power of the transponder 10 to be tested measured by the power meter 14; determining whether the initial amplitude meets a preset boundary range according to the actual input power and the preset test power; if yes, setting the initial amplitude as a target amplitude; if not, the initial amplitude is adjusted according to the preset offset.
In a specific implementation, the signal generator 11 transmits an excitation signal corresponding to the initial amplitude to the transponder 10 to be tested through the test antenna 12; after the power meter reading is stable, the current actual input power Pcs (i) of the transponder 10 to be measured is measured by the test antenna 12. Calculating the actual input power pcs (i) and the preset test power P φd1 To obtain a first difference pcs (i) -P φd1 The method comprises the steps of carrying out a first treatment on the surface of the To determine a first difference value pcs (i) -P φd1 Whether the absolute value of (a) is smaller than a preset boundary range deltap; if the initial amplitude is smaller than the preset test power, determining that the actual input power corresponding to the initial amplitude is near the preset test power, and setting the initial amplitude as a target amplitude; if the measured power is greater than or equal to the preset test power, determining that the actual input power Pcs (i) measured by the current power meter is not P φd1 Within + -Deltap, the next amplitude for detection is readjusted at this time according to the preset offset.
In the embodiment of the application, an excitation signal with initial amplitude is sent to a transponder to be measured, and the actual input power of the transponder to be measured is measured by a power meter; and determining whether the initial amplitude meets a preset boundary range according to the actual input power and the preset test power, and further adjusting the initial amplitude until the actual input power corresponding to a certain amplitude is determined to be near the preset test power, and taking the actual input power as a target amplitude. And then testing the transponder to be tested by using the excitation signal edited by the adjusted target amplitude so as to obtain a downlink signal fed back by the transponder to be tested after being started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
Based on the test system shown in the embodiment of the present application, the present application correspondingly discloses a test method, as shown in fig. 2, which is a flow chart of the test method shown in the embodiment of the present application, where the method includes:
s201: and adjusting the initial amplitude to determine the target amplitude.
The specific content of S201: the signal generator detects the transponder to be detected by utilizing the initial amplitude of the signal generator to determine the optimal excitation signal, tests the transponder to be detected by utilizing the initial amplitude, continuously adjusts the amplitude until the actual input power corresponding to the existing amplitude is near the preset test power, and determines the amplitude as the target amplitude.
S202: and testing the transponder to be tested by using the excitation signal edited by the target amplitude.
The specific content of S202: the signal generator edits the excitation signal according to the target amplitude, and transmits the excitation signal to the transponder to be tested through the test antenna so as to test the transponder to be tested. So that the transponder to be tested activates upon receipt of the excitation signal and feeds back the downlink signal.
The excitation signal is a signal of 150us excitation waveform.
Optionally, the signal generator sends the excitation signal to the spectrometer simultaneously to trigger the spectrometer by means of external triggering.
S203: and acquiring a time domain signal in the downlink signal fed back by the transponder to be tested.
The specific content of S203: and when the frequency spectrograph is triggered, directly acquiring a downlink signal fed back by the transponder to be tested through the test antenna, and acquiring a time domain signal sig in the downlink signal.
S204: judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with a preset frequency and a preset frequency offset, if so, executing step S205, and if not, executing step S206.
In step S204, the frequency spectrum of the time domain signal is obtained by fourier transforming the time domain signal.
The specific content of S204: performing Fast Fourier Transform (FFT) on the time domain signal sig to obtain a frequency spectrum f of the time domain signal, and determining whether the frequency spectrum f contains a Frequency Shift Keying (FSK) signal with a preset frequency and a preset frequency offset, if so, executing step S205, and if not, executing step S206.
It should be noted that the preset frequency refers to a center frequency of 4.23MHz, and the preset frequency offset refers to a frequency offset of 564.45 kHz.
S205: and determining that the test of the transponder to be tested passes.
Specific content of S205: and determining the starting time of the transponder to be tested within the set time.
S206: and determining that the test of the transponder to be tested is not passed.
The specific content of S206: and determining that the starting time of the transponder to be tested is not within the specified time.
In the embodiment of the application, the transponder to be tested is tested by using the excitation signal edited by the adjusted target amplitude so as to obtain the downlink signal fed back after the transponder to be tested is started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
Based on the test method shown in fig. 2, referring to fig. 3, a flow chart of another test method shown in an embodiment of the present application is shown, where the method includes:
s301: and sending the excitation signal with the initial amplitude to the transponder to be tested, and acquiring the actual input power of the transponder to be tested measured by the power meter.
The specific content of S301: the signal generator transmits an excitation signal corresponding to the initial amplitude to the transponder to be tested through the test antenna; after the reading of the power meter is stable, the current actual input power pcs (i) of the transponder to be tested is measured through the test antenna.
S302: according to the actual input power and the preset test power, it is determined whether the initial amplitude satisfies the preset boundary range, if not, step S303 is executed, and if so, steps S304 to S309 are executed.
The specific content of S302: calculating the actual input power pcs (i) and the preset test power P φd1 To obtain a first difference Pcs (i) -P φd1 The method comprises the steps of carrying out a first treatment on the surface of the The first difference Pcs (i) -P φd1 Substituting formula (1) to determine a first difference Pcs (i) -P φd1 Whether the absolute value of (a) is smaller than a preset boundary range deltap; if yes, go to step S304 to step S309; if it is greater than or equal to, step S303 is performed. That is, it is determined whether the actual input power Pcs (i) measured by the current power meter is at P φd1 Within + - Δp.
Formula (1):
abs(pcs(i)-p Φdl )＜Δp (1)
wherein abs is absolute value, pcs (i) -P φd1 For the first difference, Δp is a preset boundary range.
It should be noted that the preset test power P φd1 The power value expected to be achieved in the test is preset according to actual conditions.
The preset boundary range Δp is also set according to practical situations, and is generally set to 0.05dB.
S303: the initial amplitude is adjusted according to the preset offset, and the process returns to step S301.
The specific content of S303: in determining the last amplitude, i.e. the actual input power corresponding to the initial amplitude is not near the preset test power, i.e. is not at P φd1 When the value is within + -Deltap, the next amplitude for detection is adjusted again according to the preset offset, and the process returns to step S301, and so on until there is an actual amplitude corresponding to the amplitudeThe input power is near the preset test power, and the amplitude is taken as the target amplitude at this time, that is, step S304 is performed.
It should be noted that the preset offset is empirically set in advance.
S304: the initial amplitude is set to the target amplitude.
The specific content of S304: and when the actual input power corresponding to the initial amplitude is determined to be near the preset test power, setting the initial amplitude as a target amplitude.
S305: and testing the transponder to be tested by using the excitation signal edited by the target amplitude.
S306: and acquiring a time domain signal in the downlink signal fed back by the transponder to be tested.
S307: judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, executing step S308 when the frequency spectrum of the time domain signal is determined to contain the Frequency Shift Keying (FSK) signal with the preset frequency and the preset frequency offset, and executing step S309 if not.
In step S307, the frequency spectrum of the time domain signal is obtained by fourier transforming the time domain signal.
S308: and determining that the test of the transponder to be tested passes.
S309: and determining that the test of the transponder to be tested is not passed.
It should be noted that the specific implementation procedures of step S305 to step S309 are the same as the specific implementation procedures of step S202 to step S206 shown in the above-mentioned embodiment of the present application, and can be referred to each other.
In the embodiment of the application, an excitation signal with initial amplitude is sent to a transponder to be measured, and the actual input power of the transponder to be measured is measured by a power meter; and determining whether the initial amplitude meets a preset boundary range according to the actual input power and the preset test power, and further adjusting the initial amplitude until the actual input power corresponding to a certain amplitude is determined to be near the preset test power, and taking the actual input power as a target amplitude. And then testing the transponder to be tested by using the excitation signal edited by the adjusted target amplitude so as to obtain a downlink signal fed back by the transponder to be tested after being started. And when determining whether the frequency spectrum of the time domain signal in the downlink signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes, namely determining the conclusion that the transponder to be tested can be started in the standard time. Thus, the problems of reduced information quantity, reduced signal-to-noise ratio and information transmission failure of the downlink excitation signal transmission are avoided.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method of testing, the method comprising:
adjusting the initial amplitude until the initial amplitude meets a preset boundary range according to the actual input power corresponding to the initial amplitude and the preset test power, and determining the initial amplitude as a target amplitude;
testing the transponder to be tested by utilizing the excitation signal edited by the target amplitude;
acquiring a time domain signal in a downlink signal fed back by the transponder to be tested;
when the frequency spectrum of the time domain signal is determined to contain a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested is passed, wherein the frequency spectrum of the time domain signal is obtained by carrying out Fourier transform on the time domain signal.
2. The method of claim 1, wherein said adjusting the initial amplitude to determine the target amplitude comprises:
transmitting the excitation signal with the initial amplitude to a transponder to be tested, and acquiring the actual input power of the transponder to be tested measured by a power meter;
determining whether the initial amplitude meets a preset boundary range according to the actual input power and a preset test power;
if yes, setting the initial amplitude as a target amplitude;
if the initial amplitude is not met, the initial amplitude is adjusted according to the preset offset, and the step of sending the excitation signal of the initial amplitude to the transponder to be tested and obtaining the actual input power of the transponder to be tested measured by the power meter is returned.
3. The method of claim 2, wherein determining whether the initial amplitude meets a predetermined boundary range based on the actual input power and a predetermined test power comprises:
calculating the difference between the actual input power and the preset test power to obtain a first difference value;
judging whether the absolute value of the first difference value is smaller than a preset boundary range or not;
if the initial amplitude is smaller than the target amplitude, setting the initial amplitude as the target amplitude;
if the power is greater than or equal to the preset offset, the initial amplitude is adjusted according to the preset offset, and the step of sending the excitation signal of the initial amplitude to the transponder to be tested and acquiring the actual input power of the transponder to be tested, which is measured by a power meter, is performed.
4. The method of claim 1, wherein determining that the transponder under test tests pass when determining that the frequency spectrum of the time domain signal includes a frequency shift keyed FSK signal of a predetermined frequency and a predetermined frequency offset comprises:
performing Fourier transform on the time domain signal to obtain a frequency spectrum of the time domain signal;
judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset;
if the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes;
and if the frequency spectrum of the time domain signal does not contain the frequency shift keying FSK signal with the preset frequency and the preset frequency offset, determining that the test of the transponder to be tested is not passed.
5. A test system, the system comprising: a signal generator, a test antenna and a spectrometer;
the signal generator is connected with the test antenna, the test antenna is connected with the transponder to be tested, and the test antenna is connected with the spectrometer;
the signal generator is used for adjusting the initial amplitude until the initial amplitude meets the preset boundary range according to the actual input power corresponding to the initial amplitude and the preset test power, and determining the initial amplitude as a target amplitude; testing the transponder to be tested by utilizing the excitation signal edited by the target amplitude;
the frequency spectrograph is used for acquiring a time domain signal in a downlink signal fed back by the transponder to be tested through the test antenna; and determining that the test of the transponder to be tested passes when determining that the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, wherein the frequency spectrum of the time domain signal is obtained by carrying out Fourier transform on the time domain signal.
6. The system of claim 5, further comprising a power meter;
the power meter is connected with the test antenna;
the power meter is used for measuring the actual input power of the transponder to be tested.
7. The system of claim 6, wherein the signal generator for adjusting the initial amplitude to determine the target amplitude is specifically configured to: transmitting the excitation signal with the initial amplitude to a transponder to be tested, and acquiring the actual input power of the transponder to be tested measured by the power meter; determining whether the initial amplitude meets a preset boundary range according to the actual input power and a preset test power; if yes, setting the initial amplitude as a target amplitude; if not, the initial amplitude is adjusted according to a preset offset.
8. The system according to claim 5, wherein when determining that the spectrum of the time domain signal includes a frequency shift keying FSK signal of a preset frequency and a preset frequency offset, determining that the transponder to be tested passes the spectrometer, is specifically configured to: performing Fourier transform on the time domain signal to obtain a frequency spectrum of the time domain signal; judging whether the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset; if the frequency spectrum of the time domain signal contains a Frequency Shift Keying (FSK) signal with preset frequency and preset frequency offset, determining that the test of the transponder to be tested passes; and if the frequency spectrum of the time domain signal does not contain the frequency shift keying FSK signal with the preset frequency and the preset frequency offset, determining that the test of the transponder to be tested is not passed.
9. The system of claim 5, further comprising: a first attenuator, a second attenuator, and a power amplifier;
one end of the first attenuator is connected with the signal generator, and the other end of the first attenuator is connected with one end of the power amplifier;
the other end of the power amplifier is connected with one end of the second attenuator, and the other end of the second attenuator is connected with the test antenna;
the first attenuator and the second attenuator are used for preventing the recharging of the excitation signal;
the power amplifier is used for amplifying the sine of the excitation signal generated by the signal generator.
10. The system of claim 5, further comprising: a first filter, a second filter, and a pre-amplifier;
one end of the first filter is connected with the test antenna, the other end of the first filter is connected with one end of the preamplifier, one end of the preamplifier is connected with one end of the second filter, and the other end of the second filter is connected with the spectrometer;
the first filter and the second filter are both used for filtering out preset frequency signals in downlink signals;
the pre-amplifier is configured to amplify the downlink signal.
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