Subway signal compatibility test system

Abstract

The invention discloses a subway signal compatibility test system, which relates to the technical field of subway signals and comprises a signal acquisition module, a signal processing module and a compatibility analysis module. The signal acquisition module regulates and controls signal anti-noise parameters according to changes of an external electromagnetic environment, the problem of unstable communication quality caused by the changes of the external electromagnetic environment is effectively solved, a noise filter and demodulation gain are dynamically adjusted, the anti-interference capability of signals is improved, the communication reliability in a complex electromagnetic environment is ensured, and the communication quality is improved. Comprehensive signal acquisition and reference signal set construction are realized, frequency characteristics of different subway signal systems are effectively identified and recorded, an accurate data basis is provided for subsequent compatibility analysis, the accuracy of compatibility testing is improved, and a signal processing module is used for realizing high-precision compatibility testing through an interference factor compensation technology, such as adaptive filtering. The influence of electromagnetic interference and noise on signal quality is eliminated or reduced, and the stability and reliability of test signals are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of subway signals, and in particular to a subway signal compatibility testing system. Background Art

[0002] As new lines are opened one after another and the service life of existing line systems is approaching, more and more existing lines will have to be renovated. Because some cities' urban rail lines are built in sections, with different design and construction standards, inconsistent running train types, and inconsistent signal systems, it poses a challenge to the formulation of technical solutions for signal system renewal and renovation.

[0003] The compatible signal system solution based on the domestic platform adopts high-security chip products and secure computer platforms with domestic core technologies and uses domestic operating systems to enhance the system's autonomy and controllability and reduce dependence on foreign technology. At the same time, software interfaces are developed to achieve compatibility and interoperability between the independent CBTC signal system and the imported CBTC signal system, ensure the interconnection of on-board equipment and interlocking equipment, and realize the replacement of foreign imported signal system equipment.

[0004] The Chinese patent with publication number CN116156514A discloses a method for non-interference transformation of vehicle-to-ground communication in a signal system, comprising: setting up a new second vehicle-to-ground wireless communication subsystem on the basis of the vehicle-to-ground wireless communication subsystem of the original signal system; establishing a communication connection between the original signal system and the second vehicle-to-ground wireless communication subsystem; replacing the original vehicle-mounted communication terminal with a communication terminal adapted to the second vehicle-to-ground wireless communication subsystem during the test; performing a compatibility test, and replacing the original vehicle-mounted communication terminal with a communication terminal adapted to the second vehicle-to-ground wireless communication subsystem within the target transformation range after passing the compatibility test; removing the original signal system to complete the transformation. The present invention verifies the feasibility of the scheme step by step through step-by-step implementation and compatibility testing, effectively avoids implementation risks, does not affect the existing operating mode, and does not reduce operating capacity; uses authorized frequency bands that are not easily interfered with by the outside world, and fundamentally and effectively solves the problem of interference in vehicle-to-ground wireless communication, thereby improving customer experience and operating efficiency.

[0005] In the above patent, after the signal system is modified, it is necessary to test the compatibility between various devices and systems to ensure that the modified system can effectively interoperate with the existing signal system in various scenarios. However, during the compatibility test, due to the frequency differences and signal interference of different subway signal systems, the communication bandwidth cannot accurately collect signals and cannot cover all frequency bands of the two systems, resulting in the signal used in the test is not comprehensive enough, affecting the accuracy of the compatibility test. Summary of the invention

[0006] The purpose of the present invention is to provide a subway signal compatibility test system, which solves the problem that in the existing system, due to frequency differences and signal interference between different subway signal systems during compatibility testing, the communication bandwidth cannot accurately collect signals and cannot cover all frequency bands of the two systems, resulting in the signals used in the test being not comprehensive enough, thus affecting the accuracy of the compatibility test.

[0007] The present invention solves the above technical problems through the following technical solutions: a subway signal compatibility test system, comprising a signal acquisition module, a signal processing module and a compatibility analysis module, wherein the signal acquisition module is connected to the signal processing module by signal, and the signal processing module is connected to the compatibility analysis module by signal; The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and to construct a reference signal set covering all frequency bands; The signal processing module is used to generate a modulation signal adapted to different bandwidth requirements according to the reference signal set, and to compensate for interference factors thereon; The compatibility analysis module is used to input the compensated modulated signal into a test platform simulating a subway environment, and analyze the compatibility performance of the original signal system and the newly added signal system according to the result data fed back by the test platform.

[0008] Preferably, the operation of the signal acquisition module specifically includes the following steps: Step S1, preparation and configuration: deploy signal acquisition equipment, capture the signal frequencies of the original signal system and the newly added signal system through a spectrum analyzer and an oscilloscope, and assist in receiving signals through a noise filter and a demodulation module; Step S2, signal detection and acquisition: Under different operating conditions, the signals of the original signal system and the newly added signal system are respectively monitored in real time, and the signal anti-noise parameters are adjusted according to the changes in the external electromagnetic environment to avoid unstable communication quality, and the key parameters of the signal are recorded, including signal strength, frequency and modulation mode, and the data collected each time is recorded by time stamp; Step S3, construct a reference signal set: organize the collected signal data, mark the frequency range, construct a reference signal set covering all frequency bands, filter inconsistent or interfering signals, and ensure that the constructed reference signal set accurately reflects the system characteristics.

[0009] Preferably, the specific workflow of adjusting the signal anti-noise parameter according to the change of the external electromagnetic environment in step S2 includes: monitoring the external electromagnetic intensity E in real time through a sensor or a spectrum analyzer, setting a threshold E t , used to determine whether the current electromagnetic environment is abnormal. When the detected electromagnetic intensity E exceeds the set threshold E t When the intensity of the noise filter is adjusted, the intensity of the noise filter L调 =L 实 ×(E / E base ), where L 调 is the adjusted noise filter strength, L 实 is the current noise filter strength, E base It is the reference value of electromagnetic intensity under normal or ideal environment.

[0010] Preferably, the specific workflow of adjusting the signal anti-noise parameter according to the change of the external electromagnetic environment in step S2 also includes: when the detected electromagnetic intensity E exceeds the set threshold E t When the demodulation module is triggered to adjust the gain, the demodulation module gain G = G i ×e k(E / Et) , where G is the adjusted demodulation module gain, G i is the initial demodulation gain under normal conditions, and k is the coefficient of the system's sensitivity to electromagnetic interference.

[0011] Preferably, the signal processing module specifically includes the following steps: Step N1, reference signal set input: obtaining a constructed reference signal set from a signal acquisition module; Step N2, generating a modulation signal: using a modulation algorithm to generate an adaptive modulation signal according to different bandwidth requirements; Step N3, interference factor compensation: identifying existing interference factors, which are specifically electromagnetic interference or noise, and applying signal processing technology, which is specifically adaptive filtering, spectrum reconstruction or signal strength enhancement, to perform interference compensation on the generated modulated signal; Step N4, outputting the processed signal: passing the compensated modulated signal to the compatibility analysis module, in preparation for subsequent compatibility testing and analysis.

[0012] Preferably, the work of the compatibility analysis module specifically includes the following steps: Step M1, signal input: receiving a compensated modulated signal from a signal processing module; Step M2: Prepare a simulated test environment: Configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and truly reproduce the signal propagation situation in the scene; Step M3, signal test: input the compensated modulated signal into the simulation test platform, perform actual transmission test, and record the feedback results of the platform. The parameters are transmission quality, signal strength, bit error rate and delay; Step M4: Result analysis and report generation: Analyze the test result data and use statistical methods to evaluate the compatibility performance of the original signal system and the newly added signal system.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The signal acquisition module in the present invention regulates the signal anti-noise parameters according to the changes in the external electromagnetic environment, effectively copes with the problem of unstable communication quality caused by the changes in the external electromagnetic environment, dynamically adjusts the noise filter and the demodulation gain, improves the anti-interference ability of the signal, ensures the communication reliability in a complex electromagnetic environment, realizes comprehensive signal acquisition and reference signal set construction, effectively identifies and records the frequency characteristics of different subway signal systems, provides an accurate data basis for subsequent compatibility analysis, and improves the accuracy of compatibility testing. The signal processing module uses interference factor compensation technology, such as adaptive filtering, to effectively eliminate or reduce the impact of electromagnetic interference and noise on signal quality, ensure the stability and reliability of the test signal, and simulates the subway environment through the compatibility analysis module to provide multi-dimensional test data and enhance the comprehensiveness of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the compatibility testing system in the present invention. DETAILED DESCRIPTION

[0015] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0016] This embodiment provides a technical solution: a subway signal compatibility test system, such as Figure 1 As shown, it includes a signal acquisition module, a signal processing module and a compatibility analysis module, the signal acquisition module is connected to the signal processing module by signal, and the signal processing module is connected to the compatibility analysis module by signal; The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and to build a reference signal set covering all frequency bands; Furthermore, the work of the signal acquisition module specifically includes the following steps: Step S1, preparation and configuration: deploy signal acquisition equipment, capture the signal frequencies of the original signal system and the newly added signal system through a spectrum analyzer and an oscilloscope, and assist in receiving signals through a noise filter and a demodulation module; Step S2, signal detection and acquisition: Under different operating conditions, the signals of the original signal system and the newly added signal system are respectively monitored in real time, and the signal anti-noise parameters are adjusted according to the changes in the external electromagnetic environment to avoid unstable communication quality, and the key parameters of the signal are recorded, including signal strength, frequency and modulation mode, and the data collected each time is recorded by time stamp; Step S3, construct a reference signal set: organize the collected signal data, mark the frequency range, construct a reference signal set covering all frequency bands, filter inconsistent or interfering signals, and ensure that the constructed reference signal set accurately reflects the system characteristics.

[0017] Furthermore, the specific workflow of adjusting the signal anti-noise parameter according to the change of the external electromagnetic environment in step S2 includes: monitoring the external electromagnetic intensity E in real time through a sensor or a spectrum analyzer, setting a threshold E t , used to determine whether the current electromagnetic environment is abnormal. When the detected electromagnetic intensity E exceeds the set threshold E t When the intensity of the noise filter is adjusted, the intensity of the noise filter L 调 =L 实 ×(E / E base ), where L 调 is the adjusted noise filter strength, L 实 is the current noise filter strength, E base It is the reference value of electromagnetic intensity under normal or ideal environment.

[0018] Furthermore, the specific workflow of adjusting the signal anti-noise parameter according to the change of the external electromagnetic environment in step S2 also includes: when the detected electromagnetic intensity E exceeds the set threshold E t When the demodulation module is triggered to adjust the gain, the demodulation module gain G = G i ×e k(E / Et) , where G is the adjusted demodulation module gain, G i is the initial demodulation gain under normal conditions, and k is the coefficient of the system's sensitivity to electromagnetic interference.

[0019] The signal processing module is used to generate a modulation signal adapted to different bandwidth requirements according to a reference signal set and to compensate for interference factors; Furthermore, the work of the signal processing module specifically includes the following steps: Step N1, reference signal set input: obtaining a constructed reference signal set from a signal acquisition module; Step N2, generating a modulation signal: using a modulation algorithm to generate an adaptive modulation signal according to different bandwidth requirements; Step N3, interference factor compensation: identifying existing interference factors, which are specifically electromagnetic interference or noise, and applying signal processing technology, which is specifically adaptive filtering, spectrum reconstruction or signal strength enhancement, to perform interference compensation on the generated modulated signal; Step N4, outputting the processed signal: passing the compensated modulated signal to the compatibility analysis module, in preparation for subsequent compatibility testing and analysis.

[0020] The compatibility analysis module is used to input the compensated modulation signal into the test platform simulating the subway environment, and analyze the compatibility performance of the original signal system and the newly added signal system according to the result data fed back by the test platform; Furthermore, the work of the compatibility analysis module specifically includes the following steps: Step M1, signal input: receiving a compensated modulated signal from a signal processing module; Step M2, prepare a simulated test environment: configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and truly reproduce the signal propagation situation in the scene; Step M3, signal test: input the compensated modulated signal into the simulation test platform, perform actual transmission test, and record the feedback results of the platform. The parameters are transmission quality, signal strength, bit error rate and delay; Step M4: Result analysis and report generation: Analyze the test result data and use statistical methods to evaluate the compatibility performance of the original signal system and the newly added signal system.

[0021] The signal acquisition module in the present invention regulates the signal anti-noise parameters according to the changes in the external electromagnetic environment, effectively copes with the problem of unstable communication quality caused by the changes in the external electromagnetic environment, dynamically adjusts the noise filter and the demodulation gain, improves the anti-interference ability of the signal, ensures the communication reliability in a complex electromagnetic environment, realizes comprehensive signal acquisition and reference signal set construction, effectively identifies and records the frequency characteristics of different subway signal systems, provides an accurate data basis for subsequent compatibility analysis, and improves the accuracy of compatibility testing. The signal processing module uses interference factor compensation technology, such as adaptive filtering, to effectively eliminate or reduce the impact of electromagnetic interference and noise on signal quality, ensure the stability and reliability of the test signal, and simulates the subway environment through the compatibility analysis module to provide multi-dimensional test data and enhance the comprehensiveness of the test.

[0022] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A subway signal compatibility test system, characterized in that: It includes a signal acquisition module, a signal processing module and a compatibility analysis module, wherein the signal acquisition module is connected to the signal processing module by signal, and the signal processing module is connected to the compatibility analysis module by signal; The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and to construct a reference signal set covering all frequency bands; The signal processing module is used to generate a modulation signal adapted to different bandwidth requirements according to the reference signal set, and to compensate for interference factors thereon; The compatibility analysis module is used to input the compensated modulated signal into a test platform simulating a subway environment, and analyze the compatibility performance of the original signal system and the newly added signal system according to the result data fed back by the test platform.

2. A subway signal compatibility test system as claimed in claim 1, characterized in that: The work of the signal acquisition module specifically includes the following steps: Step S1, preparation and configuration: deploy signal acquisition equipment, capture the signal frequencies of the original signal system and the newly added signal system through a spectrum analyzer and an oscilloscope, and assist in receiving signals through a noise filter and a demodulation module; Step S2, signal detection and acquisition: Under different operating conditions, the signals of the original signal system and the newly added signal system are respectively monitored in real time, and the signal anti-noise parameters are adjusted according to the changes in the external electromagnetic environment to avoid unstable communication quality, and the key parameters of the signal are recorded, including signal strength, frequency and modulation mode, and the data collected each time is recorded by time stamp; Step S3, construct a reference signal set: organize the collected signal data, mark the frequency range, construct a reference signal set covering all frequency bands, filter inconsistent or interfering signals, and ensure that the constructed reference signal set accurately reflects the system characteristics.

3. A subway signal compatibility test system as claimed in claim 2, characterized in that: The specific working process of adjusting the signal anti-noise parameter according to the change of the external electromagnetic environment in step S2 includes: monitoring the external electromagnetic intensity E in real time through a sensor or a spectrum analyzer, setting a threshold E t , used to determine whether the current electromagnetic environment is abnormal. When the detected electromagnetic intensity E exceeds the set threshold E t When the intensity of the noise filter is adjusted, the intensity of the noise filter L 调 =L 实 ×(E / E base ), where L 调 is the adjusted noise filter strength, L 实 is the current noise filter strength, E base It is the reference value of electromagnetic intensity under normal or ideal environment.

4. A subway signal compatibility test system as claimed in claim 3, characterized in that: The specific workflow of adjusting the signal anti-noise parameters according to the change of the external electromagnetic environment in step S2 also includes: when the detected electromagnetic intensity E exceeds the set threshold E t When the demodulation module is triggered to adjust the gain, the demodulation module gain G = G i ×e k(E / Et) , where G is the adjusted demodulation module gain, G i is the initial demodulation gain under normal conditions, and k is the coefficient of the system's sensitivity to electromagnetic interference.

5. A subway signal compatibility test system as claimed in claim 1, characterized in that: The work of the signal processing module specifically includes the following steps: Step N1, reference signal set input: obtaining a constructed reference signal set from a signal acquisition module; Step N2, generating a modulation signal: using a modulation algorithm to generate an adaptive modulation signal according to different bandwidth requirements; Step N3, interference factor compensation: identifying existing interference factors, which are specifically electromagnetic interference or noise, and applying signal processing technology, which is specifically adaptive filtering, spectrum reconstruction or signal strength enhancement, to perform interference compensation on the generated modulated signal; Step N4, outputting the processed signal: passing the compensated modulated signal to the compatibility analysis module, in preparation for subsequent compatibility testing and analysis.

6. A subway signal compatibility test system as claimed in claim 1, characterized in that: The work of the compatibility analysis module specifically includes the following steps: Step M1, signal input: receiving a compensated modulated signal from a signal processing module; Step M2, prepare a simulated test environment: configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and truly reproduce the signal propagation situation in the scene; Step M3, signal test: input the compensated modulated signal into the simulation test platform, perform actual transmission test, and record the feedback results of the platform. The parameters are transmission quality, signal strength, bit error rate and delay; Step M4: Result analysis and report generation: Analyze the test result data and use statistical methods to evaluate the compatibility performance of the original signal system and the newly added signal system.

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