阅读说明：本技术 一种基于数字信号处理的铁路信号在线测试记录仪及方法 (Railway signal online test recorder and method based on digital signal processing ) 是由 杨燕红 于 2020-08-14 设计创作，主要内容包括：本发明涉及铁路信号处理技术领域,具体是一种基于数字信号处理的铁路信号在线测试记录仪及方法,包括：壳体；测试链路,其包括均用于采集和转换测试信号的第一信道和第二信道,依次连接的电流钳、程控放大器和模数转换器组成第一信道,依次连接的程控放大器和模数转换器组成第二信道；处理模块,所述处理模块分别连接第一信道和第二信道的模数转换器,用于接收、处理第一信道和第二信道输送的测试信号,并输出测试结果；以及所述壳体上设有的输入模块、显示模块和电源管理模块,所述电源管理模块提供电能。本发明的有益效果是：通过将模拟信号转换为数字信号进行处理,稳定性高,实现了多参数的在线测试记录和显示。(The invention relates to the technical field of railway signal processing, in particular to a railway signal on-line test recorder based on digital signal processing and a method thereof, wherein the railway signal on-line test recorder comprises the following steps: a housing; the test link comprises a first channel and a second channel which are used for acquiring and converting test signals, wherein the first channel consists of a current clamp, a program control amplifier and an analog-to-digital converter which are connected in sequence, and the second channel consists of the program control amplifier and the analog-to-digital converter which are connected in sequence; the processing module is respectively connected with the analog-to-digital converters of the first channel and the second channel, and is used for receiving and processing the test signals transmitted by the first channel and the second channel and outputting test results; and the input module, the display module and the power management module are arranged on the shell, and the power management module provides electric energy. The invention has the beneficial effects that: the analog signals are converted into digital signals for processing, so that the stability is high, and the online test recording and display of multiple parameters are realized.)

1. The utility model provides a railway signal on-line test record appearance based on digital signal processing, includes the casing, its characterized in that still includes:

the test link comprises a first channel and a second channel which are used for acquiring and converting test signals, wherein the first channel consists of a current clamp, a program control amplifier and an analog-to-digital converter which are connected in sequence, and the second channel consists of the program control amplifier and the analog-to-digital converter which are connected in sequence;

the processing module is respectively connected with the analog-to-digital converters of the first channel and the second channel, and is used for receiving and processing the test signals transmitted by the first channel and the second channel and outputting test results; and

the testing device comprises a shell, and is characterized in that the shell is provided with an input module, a display module and a power management module, wherein the input module is connected with a processing module and used for writing parameters into the processing module, the display module is used for displaying a testing result, and the power management module provides electric energy.

2. The railway signal online test recorder based on digital signal processing as claimed in claim 1, wherein the test link further comprises a third channel formed by sequentially connecting a converter, a programmable amplifier and an analog-to-digital converter.

3. The railway signal online test recorder based on digital signal processing as claimed in claim 1, wherein the processing module is connected to the analog-to-digital converters of the first channel and the second channel respectively, and is configured to synchronize the conversion time of the analog-to-digital converters.

4. The railway signal online test recorder based on digital signal processing as claimed in claim 1, wherein the processing module is further connected with a programmable amplifier for controlling the operation of the programmable amplifier.

5. The railway signal online test recorder based on digital signal processing as claimed in claim 1, further comprising an environmental data acquisition module, wherein the environmental data acquisition module is connected with the processing module.

6. The railway signal online test recorder based on digital signal processing as claimed in claim 1, wherein the processing module is connected with a communication unit and/or an expansion unit, and the processing module exchanges data with the outside through the communication unit and the expansion unit.

7. The railway signal online test recorder based on digital signal processing as claimed in claim 1, wherein the power management module is provided with a wireless charging unit for charging.

8. An on-line railway signal testing method based on digital signal processing, which is characterized in that the on-line railway signal testing recorder based on digital signal processing as claimed in any one of claims 1-7 is adopted, and the method comprises the following steps:

the processing module receives and stores the two converted test signals transmitted by the test link;

the processing module determines the gain of each channel according to the stored amplitude of the test signal, sets the control range of the program control amplifier and judges the state of the test signal;

the processing module carries out the conversion from a time domain signal to a frequency domain signal on the stored test signal;

and processing the frequency domain signal to obtain related parameters, and outputting the related parameters as a test result.

9. The method of claim 8, wherein the related parameters at least include voltage, current, frequency, phase difference, distortion, frequency shift parameter, high voltage pulse parameter, impedance, capacitance ESR parameter, signal energy spectrum curve, and waveform curve.

10. The digital signal processing-based railway signal online testing method as claimed in claim 8, wherein the processing module is further configured to test the superimposed multiple signals.

Technical Field

The invention relates to the technical field of railway signal processing, in particular to a railway signal online test recorder and a method based on digital signal processing.

Background

The railway signal system is important basic equipment for ensuring efficient and safe operation of the railway, and along with continuous speed increase of the railway and continuous increase of vehicle frequency, the maintenance requirement on the signal system is higher and higher. Various parameters of railway signals are accurately measured and analyzed through a special instrument, possible faults can be predicted in advance, timely maintenance and processing are guided, and the influence of the faults on the normal operation of the railway is avoided; meanwhile, when a fault or an abnormality occurs, effective information can be extracted from a complex signal environment, and the fault can be quickly and accurately positioned.

The existing railway signal test instrument mostly adopts a complex analog signal processing hardware circuit to complete data processing in cooperation with a simple processing algorithm, generally adopts a single-parameter processing mode, and only one parameter can be calculated and displayed at a time. The analog signal processing hardware has complex circuit, poor stability and large power consumption, and cannot realize multi-parameter synchronous display.

Disclosure of Invention

The invention aims to provide a railway signal online test recorder based on digital signal processing and a method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a railway signal online test recorder based on digital signal processing comprises: a housing; the test link comprises a first channel and a second channel which are used for acquiring and converting test signals, wherein the first channel consists of a current clamp, a program control amplifier and an analog-to-digital converter which are connected in sequence, and the second channel consists of the program control amplifier and the analog-to-digital converter which are connected in sequence; the processing module is respectively connected with the analog-to-digital converters of the first channel and the second channel, and is used for receiving and processing the test signals transmitted by the first channel and the second channel and outputting test results; and the input module, the display module and the power management module are arranged on the shell, the input module is connected with the processing module and used for writing parameters into the processing module, the display module is used for displaying a test result, and the power management module provides electric energy.

As a further scheme of the invention: the test link also comprises a third channel formed by sequentially connecting a converter, a programmable amplifier and an analog-to-digital converter.

As a still further scheme of the invention: the processing module is respectively connected with the analog-to-digital converters of the first channel and the second channel and used for synchronizing the conversion time of each analog-to-digital converter.

As a still further scheme of the invention: the processing module is also connected with the program control amplifier and is used for controlling the work of the program control amplifier.

As a still further scheme of the invention: and a protection circuit is connected into the test link and used for protecting each part of the test link.

As a still further scheme of the invention: the input module comprises a keyboard controller and a keyboard, the keyboard is arranged on the shell, and the keyboard is connected with the processing module through the keyboard controller.

As a still further scheme of the invention: the environment data acquisition module is connected with the processing module.

As a still further scheme of the invention: and the power management module is provided with a wireless charging unit for charging.

As a still further scheme of the invention: the processing module is connected with a communication unit and/or an expansion unit, and exchanges data with the outside through the communication unit and the expansion unit.

The invention provides another scheme that: a railway signal online test method based on digital signal processing is characterized in that the railway signal online test recorder based on digital signal processing is adopted, and the method comprises the following steps:

the processing module receives and stores the two converted test signals transmitted by the test link;

the processing module determines the gain of each channel according to the stored amplitude of the test signal, sets the control range of the program control amplifier and judges the state of the test signal;

the processing module carries out the conversion from a time domain signal to a frequency domain signal on the stored test signal;

and processing the frequency domain signal to obtain related parameters, and outputting the related parameters as a test result.

As a further scheme of the invention: the related parameters at least comprise voltage, current, frequency, phase difference, distortion degree, frequency shift parameters, high-voltage pulse parameters, impedance, capacitance values, Equivalent Series Resistance (ESR) parameters, signal energy spectrum curves and wave curves.

As a further scheme of the invention: the complex impedance is converted into a capacitance value and a capacitance ESR, so that the defect or fault of the compensation capacitor is checked, and the capacitor failure is predicted.

As a further scheme of the invention: the processing module is also used for testing the superposed various signals; and the frequency domain sequence of the voltage and the current is converted into an energy spectrum curve of the test signal, so that the interference signal in the test signal is checked.

Compared with the prior art, the invention has the beneficial effects that: the analog signals are converted into digital signals for processing, so that the stability is high, and the online test recording and display of multiple parameters are realized.

Drawings

Fig. 1 is a schematic diagram of a railway signal online test recorder based on digital signal processing.

In the drawings: 1-a Microprocessor (MCU), 2-a first analog-to-digital converter, 3-a first program control amplifier, 4-a first protection circuit, 5-a second protection circuit, 6-a second program control amplifier and 7-a second analog-to-digital converter.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Referring to fig. 1, in an embodiment of the present invention, an on-line railway signal testing recorder based on digital signal processing includes: a housing; the test link comprises a first channel and a second channel which are used for acquiring and converting test signals, wherein the first channel consists of a current clamp, a program control amplifier and an analog-to-digital converter which are connected in sequence, and the second channel consists of the program control amplifier and the analog-to-digital converter which are connected in sequence; the processing module is respectively connected with the analog-to-digital converters of the first channel and the second channel, and is used for receiving and processing the test signals transmitted by the first channel and the second channel and outputting test results; and the input module, the display module and the power management module are arranged on the shell, the input module is connected with the processing module and used for writing parameters into the processing module, the display module is used for displaying a test result, and the power management module provides electric energy.

Specifically, the program controlled amplifier and the analog-to-digital converter in the first channel are respectively a first program controlled amplifier 3 and a first analog-to-digital converter 2; the programmable amplifier and the analog-to-digital converter in the second channel are a second programmable amplifier 6 and a second analog-to-digital converter 7, respectively. The processing module comprises a microprocessor 1 and a FLASH Memory (FLASH Memory, which belongs to one of the Memory devices). And the FLASH memory is used for storing the screen capture image and the record data. The display module comprises a liquid crystal display screen. The input module comprises a keyboard controller and a keyboard, the keyboard is a matrix keyboard, the matrix keyboard is arranged on the shell, and the matrix keyboard is connected with the processing module through the keyboard controller. Function selection and parameter input are performed through a matrix keyboard.

When testing signals such as current, voltage and the like, the current signals flow into the first program control amplifier 3 through the current clamp in the first channel, the first program control amplifier 3 gains or amplifies the input current signals, and when the input current signals are input into the first analog-to-digital converter 2, the first analog-to-digital converter 2 converts the current signals input by the first program control amplifier 3 into first digital signals and then transmits the first digital signals to the microprocessor. The voltage signal I of the second channel is input into the second program-controlled amplifier 6, the second program-controlled amplifier 6 gains or amplifies the input voltage signal I, and the second analog-to-digital converter 7 converts the voltage signal I input by the second program-controlled amplifier 6 into a second digital signal and then transmits the second digital signal to the microprocessor 1; the microprocessor 1 respectively processes the digital signal I and the digital signal II to obtain a test result, and then outputs the test result to the display module for displaying, and the liquid crystal display screen performs multi-parameter display. The analog signals are converted into digital signals through the test link and then transmitted to the processing module for processing, so that the transmission flow of the analog signals is simplified, and the stability is high; the microprocessor 1 can process a plurality of test signals independently or synchronously and output the test signals to a liquid crystal display screen of the display module for multi-parameter display, and the display color and the display effect are superior to those of a single-color display screen; the displayed test results can be compared and visualized, and the test results comprise voltage, current, frequency, phase difference, distortion degree, frequency shift parameters, high-voltage pulse parameters, impedance, capacitance values, capacitance ESR parameters, signal energy spectrum curves, waveform curves and the like.

Referring to fig. 1, in a preferred embodiment of the present invention, the test link further includes a third channel formed by sequentially connecting a converter, a programmable amplifier and an analog-to-digital converter.

Specifically, the program controlled amplifier and the analog-to-digital converter are a first program controlled amplifier 3 and a first analog-to-digital converter 2, respectively. When the test signals are voltage signals I and voltage signals II, the second channel and the third channel are used for collecting and converting the voltage signals I and the voltage signals II; the voltage signal II is converted by the converter, then is transmitted to the first program control amplifier 3 for gain and amplification, and then is transmitted to the first analog-to-digital converter 2 to be converted into a digital signal III; then the digital signals are transmitted to a microprocessor 1, and the microprocessor 1 respectively processes the digital signals III to obtain test results; and then the test result is output to a display module for displaying.

In summary, the three channels of the test link can realize the acquisition and conversion of current and voltage signals and voltage signals; the microprocessor 1 carries out time-sharing or synchronous processing and outputs the time-sharing or synchronous processing for display; the functions of the railway signal online test recorder based on digital signal processing are expanded, the hardware circuit of the railway signal online test recorder based on digital signal processing is simplified, and the stability and the reliability are improved.

Preferably, the processing module is respectively connected to the analog-to-digital converters of the first channel and the second channel, and is configured to synchronize conversion time of each analog-to-digital converter; the microprocessor 1 is respectively connected with the first analog-to-digital converter 2 and the second analog-to-digital converter 7, controls the first analog-to-digital converter 2 and the second analog-to-digital converter to be connected with the second analog-to-digital converter 7 to synchronously convert the received test signals and transmits the test signals to the microprocessor 1; the microprocessor 1 synchronously processes and synchronously outputs. The multi-parameter synchronous display on the same screen is realized, the correlation and the real-time performance of the measured parameters are kept, so that the measured system is comprehensively analyzed to determine and position the fault of the measured circuit, and the potential fault is favorably found and processed in advance.

In the embodiment of the invention, the processing module is further connected with the program control amplifier and is used for controlling the work of the program control amplifier.

Specifically, the microprocessor 1 is internally provided with parameters suitable for the first program control amplifier 3 and the second program control amplifier 6, and the microprocessor 1 writes the parameters into the first program control amplifier 3 and the second program control amplifier 6 to control the working states of the first program control amplifier 3 and the second program control amplifier 6.

Furthermore, a protection circuit is connected to the test link for protecting each component of the test link. The protection circuits are respectively a first protection circuit 4 and a second protection circuit 5 which are respectively connected between a current clamp and the first program control amplifier 3 in a first channel and at the front end of a second program control amplifier 6 in a second channel; and the current and voltage fluctuation is prevented from damaging other components on the first channel and the second channel.

Referring to fig. 1, in the embodiment of the present invention, an environment data acquisition module is further included, and the environment data acquisition module is connected to the processing module.

Specifically, the environment data acquisition module comprises an optical sensor and a temperature sensor, and the optical sensor and the temperature sensor are respectively connected with the microprocessor 1; the light and temperature information is provided for the microprocessor 1 (MCU), and the MCU is used for finishing backlight adjustment and various temperature compensation of the liquid crystal display screen.

Referring to fig. 1, in the embodiment of the present invention, the power management module includes a power supply and a power management circuit connected to the power supply and the processing module, and the power management circuit is connected to a wireless charging unit for charging.

Specifically, the power supply is a lithium battery pack, and the lithium battery pack is connected with the microprocessor 1 through a power supply management circuit; the wireless charging unit comprises a wireless charging coil and a charging indicator lamp, the lithium battery pack is charged through the wireless charging coil, and the charging indicator lamp displays the charging state of the lithium battery pack. The non-contact charging is realized, and the arranged lithium battery pack ensures that the test is smoothly carried out in the non-electricity supply environment, so that the application scene is expanded.

Referring to fig. 1, in another embodiment of the present invention, the processing module is connected to a communication unit and/or an expansion unit, and the processing module exchanges data with the outside through the communication unit and the expansion unit.

Specifically, the communication unit and the expansion unit can be a USB interface and an extension interface, can be connected with a PC to export recorded pictures and data through the USB interface or the extension interface, and can also be externally provided with accessories such as an Ethernet adapter or a 4G network adapter and the like to realize remote control measurement and data export; the shell is made of plastic materials and designed by human engineering, and the holding part is provided with anti-skid rubber materials.

In another embodiment provided by the present invention, a digital signal processing-based railway signal online testing method is characterized in that any one of the above railway signal online testing recorders based on digital signal processing is adopted, and the method comprises the following steps:

the processing module receives and stores the two converted test signals transmitted by the test link;

the processing module determines the gain of each channel according to the stored amplitude of the test signal, sets the control range of the program control amplifier and judges the state of the test signal;

the processing module carries out the conversion from a time domain signal to a frequency domain signal on the stored test signal;

and processing the frequency domain signal to obtain related parameters, and outputting the related parameters as a test result.

Specifically, the processing module comprises a microprocessor 1 and a FLASH memory; the related parameters at least comprise voltage, current, frequency, phase difference, distortion degree, frequency shift parameters, high-voltage pulse parameters, impedance, capacitance values, capacitance ESR parameters, signal energy spectrum curves and waveform curves. The processing module is also used for testing the superposed various signals; and the frequency domain sequence of the voltage and the current is converted into an energy spectrum curve of the test signal, so that the interference signal in the test signal is checked.

Collecting and converting a test signal: and in a first channel, a current signal flows into the first program control amplifier 3 through the current clamp, the first program control amplifier 3 gains or amplifies the input current signal, and the first analog-to-digital converter 2 converts the current signal input by the first program control amplifier 3 into a first digital signal and then transmits the first digital signal to the microprocessor after the first analog-to-digital converter 2 inputs the first digital signal. The voltage signal I of the second channel is input into the second program-controlled amplifier 6, the second program-controlled amplifier 6 gains or amplifies the input voltage signal I, and the second analog-to-digital converter 7 converts the voltage signal I input by the second program-controlled amplifier 6 into a second digital signal and then transmits the second digital signal to the microprocessor 1;

the microprocessor 1 respectively determines the gains of a first channel and a second channel according to the amplitudes of the digital signal I and the digital signal II, and sets the control range of the program control amplifier to be adjusted to the best range; and whether the test signal is abnormal or not, whether channel faults or external current clamp and other accessories are abnormal or not can be judged according to the data of the digital signal I and the digital signal II.

Transformation of time domain signals into frequency domain signals:

the acquired time domain signal x (t) is processed by Fourier transform to obtain frequency domain signal F (w),

；

a frequency domain signal sequence is obtained using a discrete fourier transform on the stored discrete time domain signal,

；

k =0, 1, 2, … … N-1; where x (n) is a time domain sequence and F (k) is a frequency domain sequence.

Because two paths of time domain signals obtained by sampling, namely the voltage signal I (v) (n) and the current signal (I (n)) are real number sequences, the calculation of the two paths of time domain signals can be completed by adopting one-time discrete Fourier transform, and the resource of a microprocessor is saved.

；

；

；

Wherein is the conjugation of.

Then, the microprocessor 1 can obtain information such as voltage and current, phase difference, complex impedance and the like by using the frequency domain sequence, and further obtain data such as impedance, capacitance and the like. The energy spectrum curve of the test signal can be obtained by utilizing the frequency domain sequence of the voltage and the current, so that whether other interference components exist in the test signal and the frequency band of the interference signal can be visually judged, and the system fault can be conveniently checked on site; the frequency domain sequence calculated by synchronously sampling the voltage and the current at the two ends of the compensation capacitor can be used for further calculating to obtain complex impedance, and further calculating the capacitance value and the Equivalent Series Resistance (ESR) of the capacitor. Compared with the method of singly using the capacitance value, the method of using the ESR data and the capacitance value can more accurately check the defects or faults of the compensation capacitor on line, and can predict the possible capacitor failure according to the trend change of the defects or faults. The frequency domain signal is further subjected to spectrum refinement analysis, so that frequency information such as the center frequency of the sampling frequency shift signal and the low-frequency modulation signal can be obtained. And performing time-frequency domain comprehensive analysis on the time domain sequence and the frequency domain sequence to obtain data such as side frequency, amplitude and the like of the frequency shift signal. And output to the liquid crystal display screen for multi-parameter display.

The working principle of the invention is as follows: when testing signals such as current, voltage and the like, the current signals flow into the first program control amplifier 3 through the current clamp in the first channel, the first program control amplifier 3 gains or amplifies the input current signals, and when the input current signals are input into the first analog-to-digital converter 2, the first analog-to-digital converter 2 converts the current signals input by the first program control amplifier 3 into first digital signals and then transmits the first digital signals to the microprocessor. The voltage signal I of the second channel is input into the second program-controlled amplifier 6, the second program-controlled amplifier 6 gains or amplifies the input voltage signal I, and the second analog-to-digital converter 7 converts the voltage signal I input by the second program-controlled amplifier 6 into a second digital signal and then transmits the second digital signal to the microprocessor 1; the microprocessor 1 respectively processes the digital signal I and the digital signal II to obtain a test result, and then outputs the test result to the display module for displaying.

It should be noted that the microprocessor used in the present invention is an application of the prior art, and those skilled in the art can implement the functions to be achieved according to the related description, or implement the technical features to be achieved by the similar technology, and will not be described in detail herein.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.