Novel transponder information receiving equipment

Abstract

The invention provides a novel transponder information receiving device. Comprising a recording module used for recording and storing working state data and original waveform data of the novel transponder information receiving equipment; the sending module is used for sending an energy signal for activating the transponder and transmitting the received transponder signal to the receiving module; the receiving module is used for receiving and demodulating a transponder signal and transmitting the demodulated signal to the communication control module, the first demodulation circuit is used for extracting a baseband signal from the transponder signal, and the second demodulation circuit is used for converting a transponder analog signal into a digital signal through a zero-crossing comparison circuit; and the communication control module is used for controlling the signal output and reception of the sending module and the receiving module, decoding the transponder message and carrying out communication interaction with a vehicle-mounted control system. According to the invention, the anti-interference capability of the device can be improved, the reliability of demodulation and decoding is improved, the information loss of the transponder is avoided, and the availability and security of the device are improved.

Description

Technical Field

[0001] This application relates to the technical field of train control systems, and particularly to a new transponder information receiving device. Background Art

[0002] The transponder information receiving unit (BTM device) is a key component for transmitting safety-related information between ground transponders and on-vehicle train control equipment (ATP). This device transmits information through the antenna unit in a wireless radio frequency electromagnetic coupling manner. The on-vehicle antenna sends a 27.095 MHz energy signal to activate the ground transponder, and the ground transponder then sends a frequency-shift keying (FSK) modulated signal. The on-vehicle BTM device demodulates and decodes the signal and transfers the information to the on-vehicle control system.

[0003] In practical applications, BTM devices are particularly vulnerable to in-band interference, especially in complex electromagnetic environments around the antenna unit, which can lead to abnormal demodulation and decoding, and even loss of transponder information. Since different demodulation and decoding methods respond differently to interference, existing methods may not be able to effectively cope with complex interference environments. In addition, as a safety-critical device in the train control system, the security of the decoding function of BTM devices is particularly important. The existing devices have insufficient fault monitoring and data recording capabilities and cannot effectively support fault troubleshooting and problem analysis. Summary of the Invention

[0004] In view of this, embodiments of this application provide a new transponder information receiving device to solve the problems in the prior art, such as being vulnerable to interference, resulting in abnormal demodulation and decoding, loss of transponder information, and reduced device availability.

[0005] Embodiments of this application provide a new transponder information receiving device, including: a recording module for recording and storing the working state data and original waveform data of the new transponder information receiving device; a sending module for sending the energy signal to activate the transponder and transferring the received transponder signal to the receiving module, where the transponder signal is input into two demodulation circuits through two independent signal transmission paths respectively; a receiving module for receiving and demodulating the transponder signal and transferring the demodulated signal to the communication control module, where the receiving module includes two demodulation circuits, the first demodulation circuit is used to extract the baseband signal from the transponder signal, and the second demodulation circuit is used to convert the transponder analog signal into a digital signal through a zero-crossing comparison circuit; a communication control module for controlling the signal output and reception of the sending module and the receiving module, decoding the transponder message, and communicating and interacting with the on-vehicle control system.

[0006] At least one of the technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0007] A recording module is used to record and store the working state data and original waveform data of the new transponder information receiving device; a transmitting module is used to transmit the energy signal for activating the transponder and transfer the received transponder signal to the receiving module. Among them, the transponder signal is input into two demodulation circuits through two independent signal transmission paths respectively; a receiving module is used to receive and demodulate the transponder signal and transfer the demodulated signal to the communication control module. Among them, the receiving module includes two demodulation circuits. The first demodulation circuit is used to extract the baseband signal from the transponder signal, and the second demodulation circuit is used to convert the analog transponder signal into a digital signal through a zero-crossing comparison circuit; a communication control module is used to control the signal output and reception of the transmitting module and the receiving module, decode the transponder message, and communicate with the vehicle-mounted control system. This application can improve the anti-interference ability of the device, enhance the reliability of demodulation and decoding, avoid the loss of transponder information, and improve the availability and safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 It is a schematic diagram of the overall structure of the new transponder information receiving device provided by the embodiment of the present application;

[0010] Figure 2 It is a principle block diagram of demodulation heterogeneity provided by the embodiment of the present application;

[0011] Figure 3 It is a principle block diagram of decoding heterogeneity provided by the embodiment of the present application;

[0012] Figure 4 It is a schematic diagram of the transmission path of the 27M signal and the self-check signal provided by the embodiment of the present application;

[0013] Figure 5 It is a principle block diagram of the self-check redundancy circuit design of the transmitting module of the new BTM device provided by the embodiment of the present application;

[0014] Figure 6 It is a function block diagram of the BTM antenna redundancy control switching function provided by the embodiment of the present application;

[0015] Figure 7 It is a function block diagram of the application scenario where two BTM hosts share one antenna provided by the embodiment of the present application;

[0016] Figure 8It is the functional flowchart of the transponder original signal provided by the embodiment of the present application;

[0017] Figure 9 It is the compatibility design block diagram of the communication interface provided by the embodiment of the present application. Detailed implementation manners

[0018] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0019] The transponder information receiving unit BTM device (hereinafter referred to as the BTM device) is a safety transmission system that transmits safety-related information between the ground transponder and the on-vehicle train control device ATP. The information transmission is discrete point-to-point transmission and relies on the antenna unit. The antenna unit and the transponder transmit information through the wireless radio frequency electromagnetic coupling method. The on-vehicle antenna sends a 27.095 MHz energy signal to activate the ground transponder, and the ground transponder sends an FSK-modulated signal to the on-vehicle BTM for further demodulation and decoding, and transmits the ground information to the on-vehicle control system.

[0020] There are various communication methods between the BTM device and the ATP on-vehicle control system, such as Profibus bus-type communication, RS422 / RS485 point-to-point communication, CAN bus communication, etc. The corresponding communication protocols and communication mechanisms are also different. Generally, for different communication protocols and communication interfaces, different communication boards are developed for communication, which will result in different models of BTM devices, and relatively high costs will be incurred in product certification testing and engineering maintenance, etc. Therefore, it is possible to consider a compatible design of multiple hardware interfaces in the communication module, and select different communication protocol branches through hardware switches to complete the design of supporting multiple interfaces and multiple communication protocol compatibility.

[0021] During the on-site application process of the BTM device, especially the electromagnetic environment around the antenna unit is relatively complex. In-band interference is likely to cause abnormal demodulation and decoding of the BTM, resulting in the problem of transponder loss. For different demodulation and decoding methods, or even if the demodulation and decoding methods are the same but the parameter settings are different, the impacts caused by the same interference will also be different. Therefore, it is possible to consider the method of heterogeneous design through the demodulation circuit and the decoding method, that is, the same set of BTM adopts two different demodulation circuits and two different decoding methods, which can increase the probability of successful demodulation and decoding of the BTM under interference conditions. The two demodulation paths belong to the heterogeneous redundancy relationship, which further increases the availability and reliability of the device.

[0022] In addition, during the operation of the BTM device, different faults may occur. In applications, various problems such as decoding failures may be caused by the external interference environment. Therefore, monitoring and recording various anomalies that occur is very important for the investigation of equipment failures and problem analysis. Therefore, it is possible to consider adding fault detection means and data recording content to the key circuits and key signals in the BTM device to improve the maintainability of the device.

[0023] In addition, the BTM device is a safety-critical device in the train control system. In particular, the security of the decoding function needs to be effectively guaranteed. Therefore, it is possible to consider using the method of software decoding heterogeneity, that is, using different software decoding algorithms and then performing a two-out-of-two safety comparison to increase the security of the device.

[0024] In view of the problems existing in the prior art, the present application provides a new transponder information receiving device, which is mainly applied to the secure information transmission between the ground transponder and the on-vehicle train control device (ATP). The device receives the signal from the ground transponder through the antenna unit and conducts information transfer through radio frequency electromagnetic coupling. The on-vehicle BTM device demodulates and decodes the frequency shift keying (FSK) modulated signal sent by the ground transponder and transfers the information to the on-vehicle control system to ensure the safe operation of the train.

[0025] The new BTM device adopts a variety of technological innovations in its hardware design. First of all, the device includes a power supply module, a recording module, a communication control module, a receiving module, and a transmitting module. The power supply module is responsible for converting the on-vehicle power supply into the stable voltage required by each module; the recording module is used to record the working state of the device and the relevant parameters during the decoding process; the communication control module is used to control the operation of the receiving module and the transmitting module, decode the transponder message, and interact with the on-vehicle control system for information; the receiving module is responsible for receiving and demodulating the transponder signal, and processes the signal through two independent demodulation circuits to improve the success rate of demodulation. The transmitting module is responsible for transmitting the energy signal to activate the transponder and transferring the received transponder signal to the receiving module.

[0026] In the demodulation design, the receiving module of this device adopts a heterogeneous design and is configured with two different demodulation circuits to process the received signal in a redundant manner. After the first demodulation circuit passes through band-pass filtering and gain adjustment, the signal is transmitted to the narrow-band filtering circuit, and the baseband signal is extracted through envelope detection; after the second demodulation circuit passes through band-pass filtering and gain adjustment, the signal is amplified and limited, and the signal is converted into a digital signal through a zero-crossing comparator. This dual-channel demodulation design can effectively cope with interference and ensure the accuracy of the demodulation result in a complex electromagnetic environment. A redundant design is adopted between the two demodulation paths. When one of the demodulation circuits fails, the other path can still continue to work, thereby improving the reliability and availability of the device.

[0027] To further improve the reliability and security of decoding, the communication control module adopts a redundant decoding scheme and a heterogeneous decoding scheme. Redundant decoding separately performs bitstream recognition and decoding on the signals obtained by two demodulation methods, and the result of either method can be used as long as the decoding is successful. In the heterogeneous decoding process, the FPGA module first completes bitstream recognition and preliminary decoding, and then the CPU module performs secondary decoding and votes on the results. Only when the decoding results of both are consistent will the final decoding result be transmitted to the vehicle-mounted control system. This dual decoding scheme and the design of heterogeneous decoding further enhance the error tolerance and security of the device during the decoding process.

[0028] In addition, this device is also specially designed with a fault detection and monitoring function. The recording module can real-time monitor the working state and relevant parameters of the device as well as the original waveform data, so as to provide detailed fault information for maintenance personnel when a fault occurs.

[0029] The antenna unit and the transmission module of the device are connected by a coaxial cable. When two BTM devices are configured and combined with a switching device, it has the function of antenna or host fault detection and switching, ensuring that when a fault occurs in one antenna or host, the device can automatically switch to the standby host and antenna to avoid signal loss.

[0030] To support multiple vehicle-mounted control systems, the communication control module of this device has good compatibility. It can select different communication protocols through a DIP switch and supports two communication mechanisms: primary and standby redundancy and independent parallel connection. This design not only reduces the diversity of device models but also reduces the costs of product certification, testing, and maintenance.

[0031] Therefore, in summary, through a variety of innovative designs, this application significantly improves the demodulation reliability, security, fault detection ability of the BTM device in a complex electromagnetic environment, as well as its compatibility with the vehicle-mounted control system, providing a more stable and reliable solution for the safe operation of the train control system.

[0032] Next, the structure of the new transponder information receiving device provided by the embodiments of this application will be described in conjunction with the accompanying drawings and specific embodiments. Figure 1 is the overall structure schematic diagram of the new transponder information receiving device provided by the embodiments of this application, as Figure 1 shown. The new transponder information receiving device may specifically include the following:

[0033] A recording module 101, which is used to record and store the working state data and original waveform data of the new transponder information receiving device;

[0034] The transmitting module 102 is configured to transmit an energy signal for activating the transponder and transfer the received transponder signal to the receiving module. Among them, the transponder signal is input into two demodulation circuits through two independent signal transmission paths respectively;

[0035] The receiving module 103 is configured to receive and demodulate the transponder signal and transfer the demodulated signal to the communication control module. Among them, the receiving module includes two demodulation circuits. The first demodulation circuit is used to extract the baseband signal from the transponder signal, and the second demodulation circuit is used to convert the transponder analog signal into a digital signal through a zero-crossing comparison circuit;

[0036] The communication control module 104 is configured to control the signal output and reception of the transmitting module and the receiving module, decode the transponder message, and communicate and interact with the vehicle control system.

[0037] In some embodiments, the recording module is further configured to record relevant parameters during the decoding process and store them in the storage device. Among them, the relevant parameters include decoding success rate, signal quality, decoding result, decoding error information, and original waveform information.

[0038] Specifically, the recording module is not only used to record the working state data of the device, but also used to record relevant parameters during the decoding process and store these parameters in the storage device. In some examples, the recording module will monitor and record the following key parameters in real time when the device is running:

[0039] Decoding result: Each time after passing by the transponder, the recording module will record the decoding moment and various decoded data, including signal duration, train speed at the corresponding decoding moment, whether decoding is successful, decoding time used, bit error rate, and the content of the decoded message data.

[0040] Decoding error information: If an error occurs during the decoding process, the recording module will record in detail the error occurrence time, error signal duration, train speed at the corresponding moment, and relevant device states. When the error information meets certain conditions, the recording module will also record the original waveform of the error signal and store these information in the storage device. These error information will provide strong support for fault troubleshooting and equipment performance optimization.

[0041] During the actual operation process, the recording module of the BTM device will record data according to the working state of the device and real-time information during the decoding process. First, when receiving a signal from the ground transponder, the receiving module processes the signal through the demodulation circuit and transfers the demodulated signal to the communication control module. The communication control module decodes the received signal and determines whether the decoding is successful. The recording module records the decoding result, decoding duration, and corresponding signal quality in real time during this process.

[0042] For example, the recording module continuously updates the status information during the decoding process through communication with the communication control module. When decoding is successful, the recording module saves the relevant decoded data; when a decoding error occurs, the recording module saves the error information and the original waveform record of the error signal. The signal quality data and error information will be associated with each decoding operation and stored in the storage device to ensure that the system can be effectively traced during subsequent maintenance.

[0043] Furthermore, the storage device is mainly used to store various information collected by the recording module, such as signal parameters, signal quality, decoding results, and error information. The capacity and storage cycle of the storage device are set according to actual requirements. For long-running BTM devices, the storage device can ensure that the data storage does not become full through periodic cleaning and data updating, and enable historical data to be recycled and updated in a timely manner.

[0044] According to the method of the present embodiment described above, the recording module can record and store important parameters related to the decoding process in real time during the operation of the BTM device, ensuring that the operating status and fault information of the device are recorded and fed back in a timely manner. This not only enhances the maintainability of the device but also provides reliable data support for device optimization and problem troubleshooting.

[0045] In some embodiments, the sending module is used for self-checking of the downlink energy signal, and transmits the transponder signal to two demodulation circuits respectively through the signal distribution device, where the signal distribution device includes impedance matching and a band-pass filter.

[0046] Specifically, in addition to the function of sending the power signal to the antenna, the sending module of the BTM device is also responsible for receiving the signal from the ground transponder and distributing it to two independent demodulation paths in the receiving module through the signal distribution device. Specifically, the signal distribution device includes an impedance matching and a band-pass filter, whose function is to output impedance matching and perform appropriate frequency filtering on the received signal to ensure that the signal quality meets the requirements of subsequent demodulation.

[0047] When the receiving module receives the signal from the ground transponder, the signal is amplified by the power amplifier. The function of the power amplifier is to ensure that the signal intensity is high enough under long-distance transmission and environmental interference to improve the success rate of demodulation.

[0048] The band-pass filter is used to filter out the unnecessary frequency components in the spectrum and only retain the signals within the target frequency band. In this way, the filter can effectively remove the noise caused by electromagnetic interference or other irrelevant signal sources, ensuring that the signal transmitted to the demodulation circuit is purer and more stable.

[0049] The following will describe in detail the demodulation heterogeneous principle provided by the embodiments of the present application with reference to the accompanying drawings. Figure 2is the demodulation heterogeneous principle block diagram provided by the embodiments of the present application. As Figure 2 shown, the implementation principle and method of the demodulation method for the transponder signal in the receiving module in this embodiment can specifically include the following content:

[0050] The two demodulation circuits in the receiving module respectively adopt different demodulation methods to process the same transponder signal in a redundant manner, thereby increasing the probability of successful decoding and improving the reliability of the system. The specific implementation is as follows:

[0051] The first demodulation circuit: This demodulation circuit first performs band-pass filtering and gain adjustment on the signal, and then transmits the signal to the narrow-band filtering circuit for further processing. After narrow-band filtering, the signal enters the envelope detection circuit, and finally the baseband signal is extracted. This signal will be sent to the communication control module for decoding. This demodulation circuit adopts the envelope detection method and is suitable for processing signals with relatively stable frequencies.

[0052] The second demodulation circuit: This demodulation circuit also performs band-pass filtering and gain adjustment on the signal, and then the signal is further enhanced through the amplification limiter circuit to ensure that the signal can be stably processed. Finally, the signal is converted through the zero-crossing comparator, and the digital signal is output and sent to the communication control module. Different from the first demodulation circuit, the second demodulation circuit adopts the zero-crossing comparison method and can obtain more waveform detail information.

[0053] The two demodulation circuits are designed in a redundant relationship. Even if one of the demodulation circuits fails, the other demodulation circuit can still work normally and process the transponder signal. Through this redundant design, the reliability of the system has been significantly improved.

[0054] For example, the system demodulates and decodes the two signals simultaneously. When one of the demodulation circuits cannot correctly decode the signal, the system will automatically use the decoding result of the other demodulation path, thereby ensuring that the information can be correctly decoded and transmitted to the vehicle-mounted control system. In this way, the device can cope with the demodulation failure problems caused by electromagnetic interference or other reasons.

[0055] Since the two demodulation circuits adopt different demodulation methods, the influence of the interference signal on the two paths is also different. During the demodulation process, the system can identify the location of the interference by comparing the demodulation results of the two paths, further optimize the performance of the system, and provide fault analysis data. For example, when the interference signal affects the first demodulation path, the second demodulation path can still successfully demodulate the signal, thereby increasing the probability of successful decoding.

[0056] The demodulation method for the transponder signal can specifically include the following processes:

[0057] After passing through a band-pass filter and impedance matching, the signal is split into two by a signal distribution device and transmitted to two demodulation circuits in the receiving module respectively.

[0058] The first demodulation circuit performs band-pass filtering and gain adjustment on the signal, and extracts the baseband signal through narrow-band filtering and envelope detection.

[0059] The second demodulation circuit performs band-pass filtering and gain adjustment on the signal, and converts it into a digital signal through amplification limiting and a zero-crossing comparator.

[0060] The demodulated signal is transmitted to the communication control module for decoding.

[0061] If one of the demodulation circuits fails, the other demodulation circuit can still complete the demodulation task independently, thus ensuring the stability of information transmission and the reliability of the system.

[0062] For example, in practical applications, when a vehicle-mounted BTM device receives a signal from a ground transponder, it splits the signal into two and transmits them to two demodulation circuits respectively. The first demodulation circuit successfully extracts the baseband signal through envelope detection, while the second demodulation circuit converts it into a digital signal through a zero-crossing comparator due to strong interference in the signal and successfully decodes it. Finally, the communication control module successfully completes the decoding of the transponder signal by comparing the demodulation results of the two paths and transmits the decoding result to the vehicle-mounted control system.

[0063] In this process, if one of the demodulation circuits fails for some reason (such as overload or interference), the system will automatically use the other demodulation path to complete signal decoding to ensure that information transmission is not interrupted.

[0064] According to the method of this embodiment above, in this embodiment, the transponder signal is transmitted to two independent demodulation paths respectively through a signal distribution device, and different demodulation methods are used for processing. Through redundant design and different demodulation methods, the system can effectively cope with electromagnetic interference and equipment failures, improving the decoding success rate and the reliability of the system.

[0065] In some embodiments, the first demodulation circuit is used to perform band-pass filtering and gain adjustment on the transponder signal, transmit the first signal after gain adjustment to the narrow-band filtering circuit, and extract the baseband signal from the first signal by using envelope detection.

[0066] Specifically, the received transponder signal passes through the band-pass filter in the first demodulation circuit. The function of the band-pass filter is to filter out the unnecessary signals in the spectrum and only retain the signals within the target frequency band. This step helps to suppress the noise caused by electromagnetic interference or other irrelevant signal sources, ensuring that the signal quality is high enough for further processing.

[0067] Further, after band-pass filtering, the signal enters the gain adjustment circuit. The purpose of gain adjustment is to amplify or attenuate the amplitude of the signal to ensure that the signal strength is suitable for subsequent demodulation processing. Gain adjustment makes the signal reach a predetermined level, thereby improving the accuracy of demodulation.

[0068] Further, the signal after gain adjustment then enters the narrow-band filtering circuit. The narrow-band filter is used to further filter out the irrelevant frequency components in the wide-band signal, further improving the signal quality. Narrow-band filtering can perform precise selective processing on the target frequency range, only retaining the signal within the target frequency range, thereby further reducing the influence of noise and interference.

[0069] Further, after the signal passes through narrow-band filtering, it enters the envelope detection circuit. Envelope detection is a non-linear signal processing technique used to extract the low-frequency baseband signal from the modulated signal. This process rectifies and low-pass filters the signal to extract the envelope of the signal, thereby restoring the baseband signal.

[0070] In this process, the envelope detection circuit processes the signal after narrow-band filtering, eliminates the high-frequency components after modulation, only retains the baseband signal, and removes the useless high-frequency noise components. At this time, the main content of the signal is the original information sent by the transponder.

[0071] Further, the baseband signal extracted through envelope detection will be transmitted to the communication control module. After receiving the baseband signal, the communication control module performs further decoding processing. The decoded information will be transmitted to the vehicle control system to achieve the safe information transmission of the train control system.

[0072] For example, in some examples, assume that the BTM device receives a signal from the ground transponder. The signal first passes through the band-pass filter to remove the unnecessary frequency bands. Then, the signal enters the gain adjustment circuit for amplitude adjustment to ensure that the signal strength is suitable for further processing. Next, the signal passes through the narrow-band filtering circuit to precisely select the signal within the target frequency range and filter out the interference components in other frequency bands. Finally, the signal passes through the envelope detection circuit to extract the baseband signal, eliminating the high-frequency components and only leaving the original information. After this series of processing, the baseband signal is transmitted to the communication control module for decoding and then sent to the vehicle control system.

[0073] In this embodiment, through steps such as band-pass filtering, gain adjustment, narrow-band filtering, and envelope detection, the baseband signal is successfully extracted from the transponder signal, ensuring that the signal quality is suitable for further decoding. Through this precise signal processing, the system can effectively reduce the influence of interference and noise, improve the decoding accuracy, and ensure the stable and reliable information transmission of the train control system.

[0074] In some embodiments, the second demodulation circuit is used to perform band-pass filtering and gain adjustment on the transponder signal, amplify and limit the amplitude of the second signal after gain adjustment, and convert the second signal into a digital signal using a zero-crossing comparator.

[0075] Specifically, first, the received transponder signal passes through the band-pass filter in the second demodulation circuit. This band-pass filter is similar in function to the band-pass filter in the first demodulation circuit. Its main task is to remove the irrelevant frequency components in the signal and only retain the signal within the target frequency band. The quality of the signal after band-pass filtering is improved, and the influence of irrelevant signals such as electromagnetic interference is reduced.

[0076] Next, the signal passes through the gain adjustment circuit. The function of the gain adjustment circuit is to amplify or attenuate the amplitude of the signal to ensure that the intensity of the signal is suitable for subsequent processing. Through gain adjustment, it is ensured that the amplitude of the signal transmitted to the subsequent circuit is neither too small nor too large, thus avoiding decoding failure due to too weak a signal or distortion due to too strong a signal.

[0077] Furthermore, after gain adjustment, the signal enters the amplification and limiting circuit. The function of the amplification and limiting circuit is to further enhance the amplitude of the signal, ensure that the signal is within a suitable operating range, and prevent distortion caused by too large a signal amplitude. Through this circuit, the signal intensity is further stabilized to ensure that subsequent processing can be carried out correctly and precisely.

[0078] The signal after amplification and limiting passes through the zero-crossing comparison circuit. The zero-crossing comparator is a device used to convert an analog signal into a digital signal. This circuit detects when the signal crosses the zero level and generates a high or low square wave level, converting the analog sine wave signal into a digital square wave signal. The function of the zero-crossing comparator is to convert the amplitude information in the analog signal into a clear digital signal, facilitating subsequent digital demodulation and decoding.

[0079] After zero-crossing comparison, the output digital signal is transmitted to the communication control module. After receiving the digital signal, the communication control module further performs decoding processing to obtain the final transponder information.

[0080] For example, in practical applications, when the BTM device receives a signal from a ground transponder, the signal first undergoes the processing of the band-pass filter to remove the unwanted frequency bands. Then, the signal undergoes gain adjustment to make the amplitude of the signal suitable for subsequent processing. Next, the signal passes through the amplification and limiting circuit to further enhance the signal intensity and ensure that the signal is not too weak or distorted. Finally, the signal passes through the zero-crossing comparison circuit to be converted into a digital signal, ensuring the clarity and demodulability of the signal. At this time, the digital signal is transmitted to the communication control module for further demodulation and decoding, and the final result is sent to the vehicle control system.

[0081] In this embodiment, through steps such as band-pass filtering, gain adjustment, amplification limiting, and zero-crossing comparison, the transponder signal is successfully converted from an analog signal to a digital signal. The core of this signal processing process is to precisely process the signal into a digital format for subsequent demodulation and decoding operations. This processing method not only improves the signal quality but also ensures the reliability of the system and the accuracy of decoding through fine adjustment of each step.

[0082] In some embodiments, the communication control module includes an FPGA module and a CPU module. The FPGA module is used to perform bitstream recognition and preliminary decoding on the signals output by the two demodulation circuits, and the CPU module is used to perform secondary decoding on the preliminary decoding results and confirm the final decoding results.

[0083] Specifically, this embodiment will detail the working principle of the communication control module in the new BTM device, especially how the FPGA module and the CPU module work together to decode the two digital signals from the receiving module and finally generate the decoding results available for the vehicle control system.

[0084] The following will detail the decoding heterogeneous principle provided by the embodiments of this application with reference to the accompanying drawings. Figure 3 is the block diagram of the decoding heterogeneous principle provided by the embodiments of this application. As Figure 3 shown, the implementation principle and method of the decoding method for the transponder signal in this embodiment may specifically include the following content:

[0085] In this embodiment, the receiving module receives the signal from the ground transponder and performs demodulation processing through two independent demodulation circuits. After demodulation, the two signals are converted into digital signals and simultaneously transmitted to the FPGA module in the communication control module. These two signals come from different demodulation channels, so they differ in form and processing requirements. The FPGA module of the communication control module will process these two signals separately.

[0086] The FPGA module is a key component for processing signals, and its function is to perform bitstream recognition and preliminary decoding. The FPGA module can efficiently process the digital signals from the two demodulation circuits and decode these two signals using different decoding methods and algorithms. The specific operation process is as follows:

[0087] Bitstream recognition: The FPGA module first performs bitstream recognition on the received digital signal, that is, identifies the start and end positions of each bit of data in the signal to ensure that the bitstream in the decoding process can be correctly extracted.

[0088] Initial decoding: After identifying the bitstream, the FPGA module performs initial decoding on the signal. Different signals use different decoding algorithms, and appropriate decoding methods are selected according to the characteristics of each signal. This is the first heterogeneous design of the decoding method, that is, the same set of BTM devices processes different signals using different decoding paths and algorithms.

[0089] Furthermore, since the two demodulation circuits use different demodulation and decoding methods, their decoding results are in a redundant relationship, that is, as long as one of the decoding methods correctly decodes the signal, the decoding result can be transmitted as valid information to the subsequent processing steps.

[0090] For example, if one of the decoding processes is successful, the system can promptly process and output the decoding result to ensure that the vehicle control system can receive valid information.

[0091] Even if one of the decoding processes fails, due to the redundant design, the other decoding path can still provide a valid decoding result to ensure the availability and stability of the device.

[0092] Furthermore, after the FPGA module performs initial decoding, the CPU module is responsible for performing secondary decoding on the decoding result and confirming the final decoding result. The specific process is as follows:

[0093] Secondary decoding: After receiving the initial decoding result from the FPGA module, the CPU module processes these results again. The CPU module can verify the decoding result to further improve the accuracy of decoding.

[0094] Decoding result confirmation: After secondary decoding, the CPU module compares the two decoding results. If the two decoding results are the same, the system considers the decoding to be successful and passes the result to the vehicle control system. If the two decoding results are different, the CPU module will perform error handling according to the preset strategy and attempt to decode again.

[0095] Furthermore, after confirming the decoding result, the CPU module transmits the final decoding result to the vehicle control system. At this time, the vehicle control system can perform further operations based on this data to ensure the safe and stable operation of the train control system.

[0096] In some examples, it is assumed that the BTM device receives a signal from the balise, and the signal is demodulated into two digital signals through two demodulation circuits of the receiving module. The first demodulation circuit uses the envelope detection method, and the second demodulation circuit uses the zero-crossing comparison method for demodulation. After bitstream recognition, the FPGA module performs preliminary decoding on these two signals respectively, generating two decoding results. Since these two decoding results are in a redundant relationship, the system can complete data transmission based on any one of the correct decoding results. The CPU module performs secondary decoding on the decoding results, finally confirms the successful decoding, and transmits the confirmed decoding results to the vehicle control system to ensure the accuracy of the information.

[0097] In this embodiment, through the collaborative work of the FPGA module and the CPU module, the decoding process of two different demodulated signals is realized. The FPGA module is responsible for performing preliminary decoding on the signals and generating redundant decoding results, while the CPU module performs secondary decoding and final result confirmation to ensure the accuracy and reliability of the decoding process. Through the heterogeneous design of this decoding method and the processing of the redundant relationship, the system can effectively cope with interference and faults, improving the availability and stability of the BTM device.

[0098] In some embodiments, a two-out-of-two voting is performed between the preliminary decoding result output by the FPGA module and the secondary decoding result output by the CPU module. When the preliminary decoding result is consistent with the secondary decoding result, the final decoding result is transmitted to the vehicle control system.

[0099] Specifically, when the BTM device receives a signal from the balise, the signal is first demodulated by the receiving module through two demodulation paths and converted into digital signals. Two different demodulation circuits transmit the signals to the FPGA module in the communication control module respectively. The FPGA module will perform preliminary decoding on these two demodulated signals.

[0100] For example, in some examples, the FPGA module performs bitstream recognition and preliminary decoding on the digital signal, and utilizes the advantages of its hardware architecture to quickly complete the data decoding process. The result of the preliminary decoding is generated by the FPGA module and transmitted to the CPU module; at the same time, the FPGA module will also send the bitstream data information that passes the verification during the decoding process to the CPU module to provide information for further decoding.

[0101] Further, after receiving the preliminary decoding result and the bitstream data information of the FPGA module, the CPU module starts to perform secondary decoding. The decoding process of the CPU module is different from that of the FPGA module. It is based on a completely different programming language (embedded C language) and chip architecture to perform further decoding processing on the received bitstream data.

[0102] For example, the CPU module re-decodes the signal according to the bitstream information provided by the FPGA module and generates its own decoding result. Since the decoding algorithm used by the CPU module is different from that of the FPGA module, this process is the second heterogeneous design of the decoding method.

[0103] Furthermore, after the FPGA module and the CPU module complete decoding respectively, two different decoding results are generated. To improve the reliability of the decoding results, the system adopts a two-out-of-two voting mechanism. The specific operations are as follows:

[0104] The CPU module compares its secondary decoding result with the preliminary decoding result of the FPGA module to confirm whether they are consistent. If the decoding results of the two are consistent, the system considers the decoding to be successful and transmits the final decoding result to the vehicle control system.

[0105] Since the decoding algorithms, design principles, and programming languages of the FPGA and CPU modules are completely different (the FPGA uses Verilog language and the CPU uses embedded C language), and the decoding processes of the two are also carried out by different designers, the decoding results of the two have a high degree of credibility. If the two are consistent, it indicates that the reliability and accuracy of the decoding are very high.

[0106] Furthermore, when the two-out-of-two voting result is consistent, the system performs framing processing on the final decoding result and sends it to the vehicle control system. The framing operation packs and arranges multiple decoded data to ensure that the vehicle control system can correctly parse these data and perform corresponding safety control operations.

[0107] For example, in some examples, assume that the BTM device receives a signal from a ground transponder, and the signal is converted into two digital signals through two independent demodulation circuits. The first demodulation circuit decodes through envelope detection, and the second demodulation circuit decodes through a zero-crossing comparator. The FPGA module performs bitstream recognition and preliminary decoding on these two digital signals, generates a preliminary decoding result, and sends it to the CPU module together with the bitstream data information. The CPU module performs secondary decoding on the bitstream data to obtain a secondary decoding result. Through two-out-of-two voting, the two decoding results are consistent, and the final decoding result is framed and transmitted to the vehicle control system to ensure that the train control system can correctly receive the safety information.

[0108] Since the FPGA and CPU modules adopt different decoding algorithms and hardware architectures, and are developed using different programming languages, the probability of errors in their decoding results is extremely low even when processed under the same conditions. Through the two-out-of-two voting mechanism, the security and reliability of the decoding process are greatly enhanced, and the credibility of the final decoding result is improved.

[0109] In this embodiment, through the collaborative work of the FPGA and CPU modules, the two-out-of-two voting mechanism is used to confirm the decoding result, effectively improving the security and reliability of decoding. The decoding methods of the two are completely heterogeneous, and decoding processing is performed through different programming languages and hardware architectures, ensuring the consistency and accuracy of the final decoding result. This decoding method can effectively reduce the incorrect decoding caused by interference, noise or faults, and improve the reliability and stability of the BTM device in a complex electromagnetic environment.

[0110] In some embodiments, it further includes:

[0111] An antenna unit, which is used to connect to the sending module and the receiving module through a coaxial cable to send a downlink energy signal and transmit a transponder signal;

[0112] A power supply module, which is used to convert the vehicle power supply into a stable voltage required by each module in the new transponder information receiving device.

[0113] Specifically, the antenna unit is a key component in the new BTM device for activating and receiving signals from ground transponders. Its main function is to receive the transponder signal through wireless radio frequency electromagnetic coupling and transmit it to the receiving module. The working process of the antenna unit is as follows:

[0114] Sending signal: The antenna unit sends an energy signal to activate the ground transponder through wireless electromagnetic waves. The signal sent is a 27.095 MHz energy signal, which is used to activate the transponder device.

[0115] The antenna unit simultaneously transmits the received transponder signal to the receiving module of the BTM device through a coaxial cable. Through the connection of the coaxial cable, the stability and efficiency of signal transmission are ensured, and signal attenuation or loss during transmission is avoided.

[0116] The antenna unit is usually installed outside the vehicle-mounted device (such as the bottom of the carriage) to ensure that it can effectively receive signals from ground transponders. The design of the antenna unit takes into account the influence of the surrounding electromagnetic environment and has a certain anti-interference ability.

[0117] Furthermore, the main function of the power supply module is to convert the vehicle power supply (usually 110V or 24V DC power supply) into a stable voltage required by each module of the new BTM device. This module plays a crucial role in the operation of the device, ensuring that all modules can obtain a stable voltage supply, thereby avoiding device failures caused by unstable voltage. The specific working process is as follows:

[0118] The vehicle power supply (such as the vehicle-mounted 110V DC power supply) is input into the power supply module through the vehicle power supply input interface.

[0119] The DC-DC converter within the power supply module isolates and converts the input voltage of the vehicle power supply into stable voltages required by each module.

[0120] The power supply module has an efficient voltage regulation function to ensure that different modules are not affected by voltage fluctuations during operation. Whether it is the receiving module that receives the transponder signal or the communication control module that processes the signal, both can obtain sufficient and stable power supply to ensure the reliability and stability of the equipment.

[0121] The power supply module also includes functions such as overcurrent protection and overvoltage protection to prevent equipment damage caused by power problems. When a power failure occurs, the power supply module can automatically cut off the power supply to protect other modules of the equipment from damage.

[0122] Furthermore, in the new BTM device, the antenna unit and the power supply module work together with other modules (such as the receiving module, the transmitting module, and the communication control module) to ensure the normal operation of the device. The specific operation process is as follows:

[0123] The antenna unit receives the signal from the ground transponder and transmits the signal to the receiving module through a coaxial cable.

[0124] The receiving module demodulates the received transponder signal and transmits the demodulated signal to the communication control module.

[0125] The power supply module provides stable voltages for each module to ensure that the device can work stably in the vehicle environment. The power supply module continuously monitors the voltage output to prevent voltage fluctuations from having an adverse impact on the module functions.

[0126] Each part such as the antenna unit, the receiving module, the transmitting module, and the power supply module cooperate closely to ensure that the transponder signal can be efficiently transmitted, demodulated, and processed, and the decoded information is transmitted to the vehicle control system.

[0127] For example, in some examples, assume that the BTM device is installed on a train and the vehicle power supply is a 110V DC power supply. The power supply module converts the 110V power supply into 24V voltage for use by the communication control module, the receiving module, the transmitting module, etc. At the same time, the vehicle antenna unit receives the signal transmitted by the ground transponder, and the signal is transmitted to the receiving module through a coaxial cable. After the receiving module demodulates the signal, it transmits the demodulation result to the communication control module. The communication control module processes the decoded result and transmits the information to the vehicle control system to ensure the safe operation of the train control system.

[0128] According to the method of this embodiment above, the antenna unit receives and transmits signals from the ground transponder through a coaxial cable, while the power supply module provides a stable power supply for each module of the device through efficient voltage conversion and regulation functions. The coordinated operation of the antenna unit and the power supply module ensures that the device can receive, demodulate, and transmit transponder signals stably and efficiently, thus guaranteeing the safety and reliability of the train control system.

[0129] In some embodiments, it further includes:

[0130] A monitoring module, which is used to monitor the transmission channel of the energy signal so as to monitor the power output of the energy signal, and record and feedback fault information when a fault occurs;

[0131] A switching module, which is used to control the connection relationship between multiple sets of hosts and the antenna unit by using a switching device when a fault occurs in the host of the new transponder information receiving device.

[0132] Specifically, during the operation of the BTM device, different faults may occur, and different problems such as decoding failures may also be caused by the external interference environment in the application. These problems have more abundant monitoring records in the new BTM device. In addition to recording the general BTM working status and conventional self-check functions (including ROM self-check, RAM self-check, etc.), the transponder receiving path self-check function, and the basic transponder signal decoding parameters, the innovation points of the new BTM device monitoring are specifically manifested in the following two points:

[0133] (1) Monitoring of the 27M energy signal transmission channel

[0134] The generation, amplification, transmission, and sending of the 27M energy signal, the self-check signal acquisition, monitoring judgment, and recording are one of the signals with the longest transmission paths in the BTM device. Its transmission process path is as Figure 4 shown, Figure 4 which is a schematic diagram of the 27M signal and self-check signal transmission path provided by the embodiment of the present application. The signal processing design block diagram of the sending module is as Figure 5 shown, Figure 5 which is a schematic diagram of the design principle of the self-check redundancy circuit of the sending module of the new BTM device provided by the embodiment of the present application.

[0135] For general BTM devices, there is only a self-check signal for the path similar to Figure 4 shown as ①. When a 27M signal self-check fault occurs, it is not easy to distinguish whether it is a fault of the sending module or the coaxial cable and the antenna. In the new BTM device, a power output detection circuit ② is added to the sending module. Through this 27M self-check redundancy design, the maintainability of the device is improved.

[0136] For the application scenario of installing two BTM devices for a set of vehicle control systems, the BTM host is installed inside the carriage, and the antennas are installed at different positions under the vehicle with a distance interval greater than 4m. The existing method is that when one of the BTMs fails, the vehicle control system will automatically switch to the other BTM, and at the same time, when calculating the vehicle position, it will also be corrected according to the distance between the switched BTM antenna and the vehicle head. However, in the following scenario: when the BTM fails and there is exactly a transponder between the two antennas, this transponder will be lost.

[0137] In some examples, for this application scenario, the new BTM device adopts the design as Figure 6 shown, Figure 6 which is the functional block diagram of the BTM antenna redundancy control switching function provided by the embodiment of the present application, and the specific content is as follows:

[0138] The two BTM hosts can communicate with each other and exchange their working states. Under normal conditions, only one BTM host has the control right over the switching device, so as to allocate the connection relationship between the host and the antenna. After the 27M energy signal transmission channel is abnormal, the new BTM device has the function of identifying whether the fault point is the host or the antenna. When the host BTM1 with the control right identifies a host fault (including but not limited to the 27M energy signal transmission channel fault), the other BTM2 host obtains the control right over the switching device and connects itself to antenna 1. In this way, the loss of the transponder between the two antennas can be avoided to the greatest extent, and at the same time, the vehicle control system does not have to switch the logic for calculating the vehicle body position.

[0139] In addition, in some examples, the above control and use of the switching device can also be used in the scenario where two BTM hosts share one antenna (there is no installation space for two antennas under the vehicle). As Figure 7 shown, Figure 7 which is the functional block diagram of the application scenario where two BTM hosts share one antenna provided by the embodiment of the present application.

[0140] In some embodiments, this embodiment will describe in detail the working principle of the recording module in the new BTM device, especially how to record the original signal of the transponder through the high-speed AD sampling circuit and store the data according to the set conditions. To meet the need for transponder signal recording, the recording module starts the high-speed sampling function under specific circumstances to ensure the effective storage of high-quality original signal data.

[0141] In the recording module of the new BTM device, the high-speed AD sampling circuit is used to sample the transponder signal in real time and convert the sampled data into digital signals for storage. The specific operation process is as follows:

[0142] The high-speed AD sampling circuit is set at a sampling frequency of 20MHz, which is much higher than the sampling frequency of ordinary signals, ensuring that the high-frequency components of the transponder signal can be accurately captured. This sampling frequency meets the sampling requirements of the transponder signal and ensures accurate signal acquisition.

[0143] The raw transponder signal is large in volume, so a high-speed ADC sampling circuit temporarily stores the collected data and writes it to a storage device based on predefined conditions. Due to the complexity of the transponder signal, the data storage burden is relatively high, but through a reasonable storage strategy, data storage efficiency is optimized.

[0144] Furthermore, in order to reduce the storage burden and avoid recording invalid or interfering signals, this embodiment introduces conditional judgment of data recording in the recording module. These conditions include:

[0145] Transponder signal cannot be successfully decoded: When the transponder signal cannot be successfully decoded through the normal decoding process, the recording module will start the raw signal recording function. This ensures that even if the decoding fails, the relevant signal data is still recorded for subsequent analysis and troubleshooting.

[0146] Signal duration greater than Xms: The system will start data recording only when the duration of the transponder signal exceeds the set threshold X (in milliseconds). This condition can filter out short and meaningless signals, ensuring that only valid transponder signals are recorded.

[0147] Signal duration is less than Yms: To avoid recording interference signals for too long, the recording module sets an upper threshold Y (unit: milliseconds). When the signal duration exceeds Yms, the recording module will stop recording to avoid unnecessary storage consumption.

[0148] These conditions can effectively filter out useless or interfering signals, ensuring that the recording function of the original signal is activated only when needed, reducing the burden on storage devices.

[0149] like Figure 8 As shown, Figure 8 This is a flow chart of the original signal function of the transponder provided in the embodiment of the present application. Figure 8 The process shown in the figure, the working steps of the recording module are as follows:

[0150] Signal trigger detection: When the transponder signal is received, the recording module first detects whether the signal is valid. If the signal is valid (meets the sampling conditions), the system starts the AD conversion and performs real-time data sampling.

[0151] Signal Duration Judgment: After sampling starts, the system will determine whether the signal duration is greater than the set lower threshold of X ms. If the signal duration is less than X ms, the recording function will not be activated, and the system will enter the next round of signal detection. If the signal duration is greater than X ms, the system will continue to determine whether the signal is within the preset maximum duration of Y ms.

[0152] Signal Storage: If the signal duration meets the conditions (greater than X ms and less than Y ms), the original signal recording function will be activated. The sampling circuit will convert the signal into digital data and store the data in a non-volatile storage device.

[0153] Signal End Judgment: When the signal ends, the system will determine whether the signal has met the end conditions. If the signal ends and meets the saving conditions, the recording module will stop recording and save the data; otherwise, it will continue to monitor the signal.

[0154] End and Cleaning: After the data recording is completed, the system clears the sampling buffer and prepares to receive the next set of signal data.

[0155] In actual operation, assume that a signal is received from a ground transponder. First, the recording module will detect whether the signal is valid. If the signal is valid and not decoded, the system will start AD sampling and begin recording. If the duration of this signal exceeds 3 milliseconds but is less than 10 milliseconds, the recording module will continue to sample and store the data. Assume that the signal duration is 10 milliseconds and the sampling frequency is 20 MHz. The recording module will sample the signal in real-time and store the data. After the signal ends, the system determines whether the signal meets the saving conditions, and finally saves the sampled data to the storage device.

[0156] This embodiment demonstrates how the recording module achieves efficient sampling of transponder signals through a high-speed AD sampling circuit and records signals according to the set conditions. This process can effectively filter out invalid signals and ensure that only valid signal data that meets the conditions is recorded and stored, thereby improving the storage efficiency, reducing the storage burden of the system, and ensuring the complete recording of the original transponder signal in case of decoding failure, etc., providing support for subsequent fault troubleshooting and data analysis.

[0157] In some embodiments, it further includes:

[0158] A communication interface module, which is used to support the communication protocols of multiple vehicle control systems and selects different communication modes using a DIP switch to meet the communication requirements of multiple vehicle control systems.

[0159] Specifically, the compatibility design of the communication interface of the present application will be described below in conjunction with the accompanying drawings and embodiments. As Figure 9 shown, Figure 9It is a compatibility design block diagram of the communication interface provided by the embodiments of the present application. In a new BTM device, the communication control module is responsible for information exchange between the device and the vehicle control system (such as the ATP system). Since there are various communication methods in the vehicle control system, usually including different protocols such as Profibus bus-type communication, RS422 / RS485 point-to-point communication, and CAN bus communication, in order to be compatible with these communication methods, the BTM device adopts a communication interface module with high flexibility.

[0160] The main function of the communication interface module is to switch different communication protocols through a DIP switch according to the selected communication mode, so as to interact with different types of vehicle control systems.

[0161] For example, in some examples, the user selects different communication modes through the DIP switch, and the DIP switch can control a built-in switching device, enabling the device to automatically switch to different communication protocol branches according to the selection.

[0162] The communication interface module includes multiple communication circuits, which respectively support different communication protocols. Specifically:

[0163] 1 Profibus bus communication circuit, supporting communication with vehicle control systems compatible with the Profibus protocol;

[0164] 2 RS422 communication circuits, supporting the point-to-point communication protocol and suitable for point-to-point communication with other devices;

[0165] 1 CAN communication circuit, used for communication with vehicle control systems compatible with the CAN bus protocol.

[0166] According to the settings of the DIP switch, the communication interface module automatically selects and switches to the corresponding communication protocol branch and enables the corresponding communication circuit. For example, when the DIP switch is selected to the RS422 mode, the device will enable the RS422 communication circuit to achieve communication with the vehicle control system.

[0167] Furthermore, in order to ensure high reliability of communication, the new BTM device supports two communication mechanisms: primary and backup redundancy and independent parallel connection. The specific content is as follows:

[0168] Primary and backup redundancy: In the primary and backup redundancy mode, the two communication control modules ensure that the communication of the vehicle control system will not be interrupted through redundant design. If one communication module fails, the other module can immediately take over the communication task to ensure the continuity and reliability of the communication system.

[0169] Independent parallel: In the independent parallel mode, two communication control modules work simultaneously without interfering with each other, and each module independently processes its own communication tasks. In this mode, the BTM device can communicate with different vehicle control systems in parallel, improving the flexibility of the system.

[0170] The communication interface module in this embodiment has high compatibility and expandability, and can adapt to different types of vehicle control systems. Through the connection method with the same physical interface, the BTM device can expand to support new vehicle control systems by adding program branches and mode selection.

[0171] Therefore, no matter which communication mode is selected, all physical interfaces adopt a unified connection method, which enables the device to easily adapt to different vehicle control systems. The program inside the device can automatically load different communication protocol program branches according to the selection of the DIP switch, ensuring that the device can be seamlessly connected to different control systems.

[0172] For example, in some examples, assume that the BTM device needs to communicate with different types of vehicle control systems. The user selects the RS422 communication protocol through the DIP switch, and this setting will activate the corresponding RS422 communication circuit. At this time, the device will exchange data with the vehicle control system through point-to-point communication. If the device fails and switches to the redundant mode, the standby communication module will take over the communication task to ensure that the communication of the vehicle control system is not affected.

[0173] Similarly, if the user needs to communicate with a vehicle control system using the CAN bus protocol, select the corresponding CAN protocol mode of the DIP switch, and the device will switch to the CAN bus communication circuit to communicate with the vehicle control system.

[0174] According to the method of this embodiment above, this embodiment provides compatibility for communication protocols of multiple vehicle control systems through the flexible design of the communication interface module. By selecting different communication protocols through the DIP switch, the device can adapt to different control systems. The main-backup redundancy and independent parallel communication mechanisms of the system ensure high reliability and flexibility. At the same time, the compatibility and expandability design of the device also provide the possibility for future connection with new vehicle control systems. This solution greatly improves the adaptability of the device and meets the diverse communication needs of vehicle control systems.

[0175] The technical solution of this application has at least the following advantages:

[0176] 1. The new BTM device adopts two different design schemes in the transponder signal demodulation circuit design. The two demodulation circuits are in a redundant relationship, that is, for the two demodulation results, no matter which one can be successfully decoded, it can be used, improving the availability and reliability of the device.

[0177] 2. The new BTM device has a two-layer heterogeneous design in the decoding method. One is two decoding and demodulation methods (including bitstream recognition) at the FPGA level. This heterogeneous design is a redundant relationship, and any successful decoding can be used, improving the availability and reliability of the device. The other is the dual-decoding heterogeneous design of the CPU and FPGA. This heterogeneous design is a two-out-of-two voting relationship, that is, only when the two decoding results are the same can it be used to send to the vehicle control system. Since the program carriers are different and the programming languages are different, and generally the designers are also different, the voting result is more credible, improving the security of the system.

[0178] 3. The redundant design of the 27M energy signal channel monitoring method of the BTM device facilitates distinguishing whether it is a failure of the sending module or a failure of the cable and antenna in case of a fault. After separating these two parts, the cable and antenna can be distinguished by other simple methods, improving the maintainability of the device.

[0179] 4. The recording of the transponder original signal can assist device maintenance personnel and developers to further analyze the problem that the transponder cannot be decoded, facilitating finding the cause of the problem and improving the maintainability of the device.

[0180] 5. The compatibility design of multiple communication interfaces enables the same model of BTM device to be connected to different vehicle control systems, reducing the types of BTM device models and lowering the product certification testing cost and maintenance cost.

[0181] The above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A new transponder information receiving device, characterized in that Including: A recording module, configured to record and store the working state data and original waveform data of the new transponder information receiving device; A transmitting module, configured to transmit an energy signal for activating the transponder and transfer the received transponder signal to the receiving module, wherein the transponder signal is input into two demodulation circuits respectively through two independent signal transmission paths; A receiving module, configured to receive and demodulate the transponder signal and transfer the demodulated signal to the communication control module, wherein the receiving module includes two demodulation circuits, the first demodulation circuit is configured to extract a baseband signal from the transponder signal, and the second demodulation circuit is configured to convert the transponder analog signal into a digital signal through a zero-crossing comparison circuit; A communication control module, configured to control the signal output and reception of the transmitting module and the receiving module, decode the transponder message, and perform communication interaction with the vehicle-mounted control system.

2. The novel transponder information receiving device according to claim 1, wherein The recording module is further configured to record the relevant parameters during the decoding process and store them in a storage device, wherein the relevant parameters include decoding success rate, signal quality, decoding result, decoding error information, and original waveform information.

3. The novel transponder information receiving device according to claim 1, characterized in that The transmitting module is configured to perform self-check on the downlink energy signal and transfer the transponder signal to the two demodulation circuits respectively through a signal distribution device, wherein the signal distribution device includes impedance matching and a band-pass filter.

4. The novel transponder information receiving device according to claim 1, characterized in that, The first demodulation circuit is configured to perform band-pass filtering and gain adjustment on the transponder signal, transfer the first signal after gain adjustment to a narrow-band filtering circuit, and extract the baseband signal from the first signal by using envelope detection.

5. The novel transponder information receiving device according to claim 1, characterized in that, The second demodulation circuit is configured to perform band-pass filtering and gain adjustment on the transponder signal, amplify and limit the second signal after gain adjustment, and convert the second signal into a digital signal by using a zero-crossing comparator.

6. The novel transponder information receiving device according to claim 1, characterized in that, The communication control module includes an FPGA module and a CPU module, the FPGA module is configured to perform bit-stream identification and preliminary decoding on the signals output by the two demodulation circuits, and the CPU module is configured to perform secondary decoding on the preliminary decoding result and confirm the final decoding result.

7. The novel transponder information receiving device according to claim 6, wherein A two-out-of-two voting is performed between the preliminary decoding result output by the FPGA module and the secondary decoding result output by the CPU module. When the preliminary decoding result is consistent with the secondary decoding result, the final decoding result is transferred to the vehicle-mounted control system.

8. The novel transponder information receiving device according to claim 1, wherein, Further including: An antenna unit, configured to be connected to the transmitting module and the receiving module through a coaxial cable to transmit a downlink energy signal and transfer the transponder signal; A power supply module, configured to convert the vehicle-mounted power supply into stable voltages required by each module in the new transponder information receiving device.

9. The novel transponder information receiving device according to claim 8, wherein Further including: A monitoring module, configured to monitor the transmission channel of the energy signal so as to monitor the power output of the energy signal, and record and feedback fault information when a fault occurs; A switching module, configured to control the connection relationship between multiple sets of hosts and the antenna unit by using a switching device when a fault occurs in the host of the new transponder information receiving device.

10. The novel transponder information receiving device according to claim 1, wherein Further including: A communication interface module, which is used to support the communication protocols of multiple vehicle control systems and select different communication modes by using DIP switches to meet the communication requirements of multiple vehicle control systems.

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