A subway signal compatibility testing system

Abstract

The present invention discloses a subway signal compatibility test system, which relates to the technical field of subway signals and includes a signal acquisition module, a signal processing module, and a compatibility analysis module. In the present invention, the signal acquisition module adjusts the signal anti-noise parameters according to the changes in the external electromagnetic environment, effectively coping with the problem of unstable communication quality caused by the changes in the external electromagnetic environment, dynamically adjusting the noise filter and the demodulation gain, improving the anti-interference ability of the signal, ensuring the communication reliability in a complex electromagnetic environment, realizing comprehensive signal acquisition and the construction of a reference signal set, effectively identifying and recording the frequency characteristics of different subway signal systems, providing an accurate data basis for subsequent compatibility analysis, and improving the accuracy of compatibility testing. The signal processing module uses interference factor compensation techniques, such as adaptive filtering, to eliminate or reduce the influence of electromagnetic interference and noise on the signal quality, ensuring the stability and reliability of the test signal.

Description

Technical Field

[0001] The present invention relates to the technical field of subway signals, and particularly to a subway signal compatibility test system. Background Art

[0002] With the successive opening of newly built lines and the approaching of the service life of the existing line systems, the transformation of more and more existing lines is imperative. Due to the segmented construction of urban rail lines in some cities, different design and construction standards, inconsistent operating train types, and inconsistent signal systems, it poses challenges to the formulation of technical solutions for the renewal and transformation of signal systems.

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

[0004] Chinese Patent No. CN116156514A discloses a method for non-intrusive transformation of vehicle-ground communication in a signal system, including: setting up a new second set of vehicle-ground wireless communication subsystems on the basis of the original vehicle-ground wireless communication subsystem of the signal system; establishing a communication connection between the original signal system and the second set of vehicle-ground wireless communication subsystems; replacing the original on-vehicle communication terminal with a communication terminal adapted to the second set of vehicle-ground wireless communication subsystems during the test; conducting compatibility tests, and then replacing the original on-vehicle communication terminal with a communication terminal adapted to the second set of vehicle-ground wireless communication subsystems within the target transformation range in sequence; removing the original signal system to complete the transformation. The present invention gradually verifies the feasibility of the solution through step-by-step implementation and compatibility testing, effectively avoiding implementation risks, not affecting the existing operation mode, and not reducing the operation capacity; using an authorized frequency band, not easily affected by external interference, fundamentally and effectively solving the problem of vehicle-ground wireless communication interference, and improving the customer experience and operation efficiency.

[0005] After the transformation of the signal system in the above patent, it is necessary to test the compatibility between various devices and systems to ensure that the transformed system can effectively interoperate with the existing signal system in various scenarios. However, currently, due to the frequency differences and signal interference of 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 incomplete signals used in the test and affecting the accuracy of compatibility testing. 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 the frequency differences and signal interferences of different subway signal systems, the communication bandwidth cannot accurately collect signals and cannot cover all frequency bands of the two systems, resulting in incomplete signals used in the test and 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 includes a signal acquisition module, a signal processing module, and a compatibility analysis module. The signal acquisition module is signal-connected to the signal processing module, and the signal processing module is signal-connected to the compatibility analysis module.

[0008] The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and construct a reference signal set covering all frequency bands.

[0009] The signal processing module is used to generate modulation signals that meet different bandwidth requirements according to the reference signal set, and compensate for interference factors.

[0010] The compatibility analysis module is used to input the compensated modulation signal into a test platform that simulates the subway environment, and analyze the compatibility performance of the original signal system and the newly added signal system according to the result data feedback by the test platform.

[0011] Preferably, the operation of the signal acquisition module specifically includes the following steps:

[0012] 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.

[0013] Step S2, signal detection and acquisition: Under different operating conditions, respectively monitor the signals of the original signal system and the newly added signal system in real time, adjust the signal anti-noise parameters according to the changes in the external electromagnetic environment to avoid unstable communication quality, record the key parameters of the signals, where the parameters include signal strength, frequency, and modulation method, and record the data collected each time through a time stamp.

[0014] Step S3, constructing a reference signal set: Organize the collected signal data, mark the frequency range, construct a reference signal set covering all frequency bands, and filter out inconsistent or interfering signals to ensure that the constructed reference signal set accurately reflects the system characteristics.

[0015] Preferably, the specific work process of adjusting the signal anti-noise parameters according to the changes in the external electromagnetic environment in step S2 includes: Real-time monitoring of the external electromagnetic intensity E through a sensor or a spectrum analyzer, and 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 , it triggers the intensity adjustment of the noise filter. The intensity L of the noise filter 调 =L 实 ×(E / E base ), where L 调 is the adjusted intensity of the noise filter, and L 实 is the current intensity of the noise filter, and E base is the electromagnetic intensity reference value in a normal or ideal environment.

[0016] Preferably, the specific workflow for regulating the signal anti-noise parameters according to the change of the external electromagnetic environment in step S2 further includes: when the detected electromagnetic intensity E exceeds the set threshold E t , it triggers the gain adjustment of the demodulation module. The gain G of the demodulation module = G i ×e k(E / Et) , where G is the adjusted gain of the demodulation module, G i is the initial demodulation gain in a normal environment, and k is the coefficient of the system's sensitivity to electromagnetic interference.

[0017] Preferably, the work of the signal processing module specifically includes the following steps:

[0018] Step N1, input of the reference signal set: Obtain the constructed reference signal set from the signal acquisition module;

[0019] Step N2, generate the modulation signal: Generate an adaptive modulation signal according to different bandwidth requirements using the modulation algorithm;

[0020] Step N3, interference factor compensation: Identify the existing interference factors, which are specifically electromagnetic interference or noise, and apply signal processing techniques, specifically adaptive filtering, spectrum reconstruction, or signal intensity enhancement, to perform interference compensation on the generated modulation signal;

[0021] Step N4, output the processed signal: Transmit the compensated modulation signal to the compatibility analysis module for subsequent compatibility testing and analysis.

[0022] Preferably, the work of the compatibility analysis module specifically includes the following steps:

[0023] Step M1, signal input: Receive the compensated modulation signal from the signal processing module;

[0024] Step M2, prepare the simulation test environment: Configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and reproduce the signal propagation situation in the real scene;

[0025] Step M3, Signal Testing: Input the compensated modulation signal into the analog test platform for actual transmission testing, record the feedback results of the platform, and the parameters are transmission quality, signal strength, bit error rate, and latency.

[0026] Step M4, Result Analysis and Report Generation: Analyze the test result data, use statistical methods, and evaluate the compatibility performance of the original signal system and the newly added signal system.

[0027] The beneficial effects of the present invention compared with the prior art are as follows:

[0028] In the present invention, the signal acquisition module adjusts the signal anti-noise parameters according to the changes in the external electromagnetic environment, effectively coping with the problem of unstable communication quality caused by changes in the external electromagnetic environment, dynamically adjusting the noise filter and demodulation gain, improving the anti-interference ability of the signal, ensuring the communication reliability in a complex electromagnetic environment, realizing comprehensive signal acquisition and construction of the reference signal set, effectively identifying and recording the frequency characteristics of different subway signal systems, providing an accurate data basis for subsequent compatibility analysis, improving the accuracy of compatibility testing. The signal processing module uses interference factor compensation technologies such as adaptive filtering to effectively eliminate or reduce the influence of electromagnetic interference and noise on the signal quality, ensuring the stability and reliability of the test signal. The compatibility analysis module simulates the subway environment to provide multi-dimensional test data, enhancing the comprehensiveness of the test. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the compatibility testing system in the present invention. Detailed Embodiment

[0030] The following further describes the above and other technical features and advantages of the present invention in more detail with reference to the drawings.

[0031] This embodiment provides a technical solution: A subway signal compatibility testing system, as Figure 1 shown, includes a signal acquisition module, a signal processing module, and a compatibility analysis module. The signal acquisition module is signal-connected to the signal processing module, and the signal processing module is signal-connected to the compatibility analysis module;

[0032] The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and construct a reference signal set covering all frequency bands;

[0033] Further, the operation of the signal acquisition module specifically includes the following steps:

[0034] 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;

[0035] 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. The signal anti-noise parameters are adjusted according to the changes in the external electromagnetic environment to avoid unstable communication quality. The key parameters of the signals are recorded, including signal strength, frequency, and modulation method. The data collected each time is recorded through a timestamp;

[0036] Step S3, Component Reference Signal Set: The collected signal data is sorted, the frequency range is marked, a reference signal set covering all frequency bands is constructed, and inconsistent or interfering signals are filtered to ensure that the constructed reference signal set accurately reflects the system characteristics.

[0037] Furthermore, the specific workflow of adjusting the signal anti-noise parameters according to the changes in the external electromagnetic environment in Step S2 includes: Real-time monitoring of the external electromagnetic intensity E through a sensor or a spectrum analyzer, and 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 , the intensity adjustment of the noise filter is triggered. The intensity L of the noise filter 调 = L 实 × (E / E base ), where L 调 is the adjusted intensity of the noise filter, L 实 is the current intensity of the noise filter, and E base is the electromagnetic intensity reference value in a normal or ideal environment.

[0038] Furthermore, the specific workflow of adjusting the signal anti-noise parameters according to the changes in the external electromagnetic environment in Step S2 also includes: When the detected electromagnetic intensity E exceeds the set threshold E t , the gain adjustment of the demodulation module is triggered. The gain G of the demodulation module = G i × e k(E / Et) , where G is the adjusted gain of the demodulation module, G i is the initial demodulation gain in a normal environment, and k is the coefficient of the system's sensitivity to electromagnetic interference.

[0039] The signal processing module is used to generate modulation signals adapted to different bandwidth requirements according to the reference signal set and compensate for interference factors;

[0040] Further, the work of the signal processing module specifically includes the following steps:

[0041] Step N1, Reference Signal Set Input: Obtain the constructed reference signal set from the signal acquisition module;

[0042] Step N2, generate a modulation signal: Generate an adaptive modulation signal using a modulation algorithm according to different bandwidth requirements;

[0043] Step N3, interference factor compensation: Identify the existing interference factors, specifically electromagnetic interference or noise, and apply signal processing techniques, specifically adaptive filtering, spectrum reconstruction, or signal strength enhancement, to perform interference compensation on the generated modulation signal;

[0044] Step N4, output the processed signal: Transmit the compensated modulation signal to the compatibility analysis module for subsequent compatibility testing and analysis.

[0045] The compatibility analysis module is used to input the compensated modulation signal into a test platform that simulates the subway environment, and analyze the compatibility performance of the original signal system and the newly added signal system based on the result data feedback by the test platform;

[0046] Furthermore, the work of the compatibility analysis module specifically includes the following steps:

[0047] Step M1, signal input: Receive the compensated modulation signal from the signal processing module;

[0048] Step M2, prepare the simulation test environment: Configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and reproduce the signal propagation situation in the scene realistically;

[0049] Step M3, signal test: Input the compensated modulation signal into the simulation test platform for actual transmission testing, and record the feedback results of the platform, with parameters being transmission quality, signal strength, bit error rate, and delay;

[0050] Step M4, result analysis and report generation: Analyze the test result data using statistical methods to evaluate the compatibility performance of the original signal system and the newly added signal system.

[0051] In the present invention, the signal acquisition module adjusts the signal anti-noise parameters according to changes in the external electromagnetic environment, effectively addresses the problem of unstable communication quality caused by changes in the external electromagnetic environment, dynamically adjusts the noise filter and demodulation gain, improves the anti-interference ability of the signal, ensures communication reliability in a complex electromagnetic environment, realizes comprehensive signal acquisition and construction of the reference signal set, effectively identifies and records the frequency characteristics of different subway signal systems, provides an accurate data basis for subsequent compatibility analysis, improves the accuracy of compatibility testing, the signal processing module effectively eliminates or reduces the impact of electromagnetic interference and noise on signal quality through interference factor compensation techniques such as adaptive filtering, ensures the stability and reliability of the test signal, and provides multi-dimensional test data by simulating the subway environment through the compatibility analysis module, enhancing the comprehensiveness of the test.

[0052] The above are only the preferred embodiments of the present invention, which are illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims

1. A subway signal compatibility testing system, characterized in that, It includes a signal acquisition module, a signal processing module and a compatibility analysis module. The signal acquisition module is signal-connected to the signal processing module, and the signal processing module is signal-connected to the compatibility analysis module; The signal acquisition module is used to collect the signal frequencies of the original signal system and the newly added signal system, and construct a reference signal set covering all frequency bands; The signal processing module is used to generate modulation signals that meet different bandwidth requirements according to the reference signal set, and compensate for interference factors thereof; The compatibility analysis module is used to input the compensated modulation signal into a test platform that simulates 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; 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, respectively and real-time monitor the signals of the original signal system and the newly added signal system, adjust the signal anti-noise parameters according to changes in the external electromagnetic environment to avoid unstable communication quality, record the key parameters of the signals, where the parameters include signal strength, frequency and modulation method, and record the data collected each time through a timestamp; Step S3, Construct a Reference Signal Set: Sort out the collected signal data, mark the frequency range, construct a reference signal set covering all frequency bands, and filter out inconsistent or interfering signals to ensure that the constructed reference signal set accurately reflects the system characteristics; The specific workflow for regulating the signal anti-noise parameters according to the changes in the external electromagnetic environment in step S2 includes: real-time monitoring of the external electromagnetic intensity E through a sensor or a spectrum analyzer, and setting a threshold value E t , which is used to determine whether the current electromagnetic environment is abnormal. When the detected electromagnetic intensity E exceeds the set threshold value E t , it triggers the intensity adjustment of the noise filter. The intensity L 调 of the noise filter is calculated as L 实 = L base × (E / E base ), where L 调 is the adjusted intensity of the noise filter, L 实 is the current intensity of the noise filter, and E base is the electromagnetic intensity reference value in a normal or ideal environment.

2. The subway signal compatibility test system according to claim 1, wherein The specific workflow of adjusting the signal anti-noise parameters according to the changes in the external electromagnetic environment in step S2 further includes: when the detected electromagnetic intensity E exceeds the set threshold E t , the gain adjustment of the demodulation module is triggered, and the gain G of the demodulation module is G i ×e k(E / Et) , where G is the adjusted gain of the demodulation module, G i is the initial demodulation gain in a normal environment, and k is the coefficient of the system's sensitivity to electromagnetic interference.

3. A subway signal compatibility test system according to claim 1, characterized in that, The work of the signal processing module specifically includes the following steps: Step N1, Input of the Reference Signal Set: Obtain the constructed reference signal set from the signal acquisition module; Step N2, Generate Modulation Signals: Generate adaptive modulation signals according to different bandwidth requirements using modulation algorithms; Step N3, Interference Factor Compensation: Identify existing interference factors, which are specifically electromagnetic interference or noise, and apply signal processing technologies, which are specifically adaptive filtering, spectrum reconstruction or signal strength enhancement, to compensate for interference in the generated modulation signals; Step N4, Output Processed Signals: Transmit the compensated modulation signals to the compatibility analysis module to prepare for subsequent compatibility testing and analysis.

4. A subway signal compatibility test system according to claim 1, characterized in that, The work of the compatibility analysis module specifically includes the following steps: Step M1, Signal Input: Receive the compensated modulation signal from the signal processing module; Step M2, Prepare the Simulated Test Environment: Configure a test platform that simulates the subway environment, simulate the noise environment and interference sources, and reproduce the signal propagation situation in the scene realistically; Step M3, Signal Testing: Input the compensated modulation signal into the simulated test platform for actual transmission testing, and record the feedback results of the platform, and the parameters are transmission quality, signal strength, bit error rate and delay; Step M4, Result Analysis and Report Generation: Analyze the test result data, use statistical methods to evaluate the compatibility performance of the original signal system and the newly added signal system.

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