Railway transponder communication system based on millimeter wave signals

Abstract

The invention discloses a railway transponder communication system based on millimeter wave signals, the system comprises a ground transponder and a vehicle-mounted receiving module, the ground transponder comprises a ground receiving and sending unit and a ground signal modulation unit, and the vehicle-mounted receiving module comprises a vehicle-mounted receiving and sending unit and a transponder demodulation processing unit; the ground transponder is used for performing coding, modulation and millimeter wave conversion on the operating environment data based on the ground signal modulation unit in an activated state to obtain a millimeter wave signal, and transmitting the millimeter wave signal to the vehicle-mounted receiving module based on the ground receiving and transmitting unit; and the vehicle-mounted receiving module is used for receiving the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit, and performing signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit to obtain operating environment data. Millimeter wave communication is realized between the ground transponder and the vehicle-mounted receiving module, and the efficiency and data volume of data transmission between the vehicle and the ground can be improved.

Description

Technical Field

[0001] The present invention relates to the field of rail transit communication, and in particular to a railway transponder communication system based on millimeter wave signals. Background Art

[0002] With the further increase in the speed of high-speed rail and the development of ultra-high-speed maglev, for the existing transponder with an average data rate of 564kbit / s, the ultra-short effective communication time between the transponder and the on-board antenna may cause the problem that the effective communication times of uplink and downlink data are insufficient to obtain correct data.

[0003] In addition, with the digital development of railways, it is also necessary to use transponders to complete the interaction of massive data between vehicles and the ground. However, the existing transponder long message is a 1023-bit cyclic code, and the user data it can carry is 830 bits. This information only includes basic information such as the length of the line track section, carrier frequency, speed, slope, link, etc. For digital railways, it may also include trackside monitoring, perception sensing and other equipment. Therefore, the limited bandwidth cannot meet the communication needs of more data. Summary of the invention

[0004] The present invention provides a railway transponder communication system based on millimeter wave signals to improve the efficiency and data volume of data transmission between trains and ground.

[0005] According to one aspect of the present invention, there is provided a railway transponder communication system based on millimeter wave signals, characterized in that it comprises: a ground transponder and a vehicle-mounted receiving module, wherein the ground transponder comprises a ground receiving and transmitting unit and a ground signal modulation unit, and the vehicle-mounted receiving module comprises a vehicle-mounted receiving and transmitting unit and a transponder demodulation processing unit;

[0006] The ground transponder is used to encode, modulate and convert the operating environment data into millimeter waves based on the ground signal modulation unit in an activated state to obtain a millimeter wave signal, and transmit the millimeter wave signal to the vehicle-mounted receiving module based on the ground receiving and transmitting unit;

[0007] The vehicle-mounted receiving module is used to receive the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit, and perform signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit to obtain the operating environment data.

[0008] Optionally, the vehicle-mounted receiving module is used to send a wake-up signal based on the vehicle-mounted receiving and sending unit during the operation of the train;

[0009] The ground transponder is used to receive the wake-up signal in real time based on the ground receiving and sending unit. When the wake-up signal is received, the ground transponder enters an activated state.

[0010] Optionally, the ground signal modulation unit includes a coding subunit, a modulation subunit and a signal conversion subunit;

[0011] The encoding subunit is used to encode the operating environment data to obtain a cyclic code;

[0012] The modulation subunit is used to modulate and encode the cyclic code to obtain a modulated signal;

[0013] The signal conversion subunit includes a mixer, an intermediate frequency power amplifier, a frequency converter, a filter and a power amplifier, and is used to perform millimeter wave conversion on the modulated signal to obtain a millimeter wave signal.

[0014] Optionally, the transponder demodulation processing unit includes a signal restoration subunit, a demodulation subunit and a decoding subunit;

[0015] The signal restoration subunit includes a frequency converter, a low-noise operational amplifier, a phase shifter, a filter and a sampling decision, and is used to restore the millimeter wave signal to obtain a modulated signal;

[0016] The demodulation subunit is used to demodulate the modulated signal to obtain a cyclic code;

[0017] The decoding subunit is used to decode the cyclic code to obtain operating environment data.

[0018] Optionally, the ground transponder includes a storage unit, and the storage unit is used to store operating environment data;

[0019] The ground transponder is also used to read the operating environment data in the storage unit.

[0020] Optionally, the ground transponder includes a data message decoding unit;

[0021] The ground transponder is also used for receiving data messages from the ground electronic unit, decoding the data messages based on the data message decoding unit to obtain operating environment data, and storing the operating environment data in the storage unit.

[0022] Optionally, the ground electronic unit is used to receive multi-source data sent by a trackside data acquisition device, integrate the multi-source data to obtain integrated data, encode the integrated data, and generate a data message.

[0023] Optionally, the ground transponder and the ground electronic unit are connected via a cable.

[0024] Optionally, the ground receiving and transmitting unit includes a transmitting antenna subunit, the transmitting antenna subunit includes at least one transmitting antenna and a curved antenna anti-diffusion surface, and the transmitting antenna is arranged on the concave side of the antenna anti-diffusion surface.

[0025] Optionally, the on-board receiving module also includes a train control system communication interface unit, and the on-board receiving module is used to send the operating environment data to the train control system through the train control system communication interface unit.

[0026] According to the technical solution of the embodiment of the present invention, when the ground transponder is activated, the ground signal modulation unit encodes, modulates and converts the operating environment data into millimeter wave to obtain a millimeter wave signal, and transmits the millimeter wave signal to the vehicle-mounted receiving module based on the ground receiving and transmitting unit; the vehicle-mounted receiving module receives the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit, and performs signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit to obtain the operating environment data. Realizing millimeter wave communication between the ground transponder and the vehicle-mounted receiving module can improve the efficiency and amount of data transmission between the vehicle and the ground.

[0027] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of a railway transponder communication system based on millimeter wave signals provided by an embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a transmitting antenna subunit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Figure 1 It is a structural diagram of a railway transponder communication system based on millimeter wave signals provided in an embodiment of the present invention. This embodiment can be applied to the situation where ground-to-train communication is carried out between the ground and the train during the operation of the train. The method can be executed by a railway transponder communication system based on millimeter wave signals, and the railway transponder communication system based on millimeter wave signals can be implemented in the form of hardware and / or software.

[0034] like Figure 1 As shown, the system includes: a ground transponder 110 and a vehicle-mounted receiving module 120, the ground transponder 110 includes a ground receiving and transmitting unit 111 and a ground signal modulation unit 112, and the vehicle-mounted receiving module 120 includes a vehicle-mounted receiving and transmitting unit 121 and a transponder demodulation processing unit 122;

[0035] The ground transponder 110 is used to encode, modulate and convert the operating environment data into millimeter wave based on the ground signal modulation unit 112 in an activated state to obtain a millimeter wave signal, and transmit the millimeter wave signal to the vehicle-mounted receiving module 120 based on the ground receiving and transmitting unit 111;

[0036] The vehicle-mounted receiving module 120 is used to receive the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit 121, and perform signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit 122 to obtain the operating environment data.

[0037] Among them, the ground transponder 110 includes an active transponder and a passive transponder. The operating environment data of the active transponder includes fixed information and variable information. Specifically, the fixed information includes but is not limited to parameters such as line slope and the specified operating speed of the line; the variable information includes parameters such as temporary speed limit information and station access information. Since the passive transponder does not require an external power supply, its internal information cannot be changed in real time, so the operating environment data of the passive transponder only has fixed information.

[0038] In the embodiment of the present invention, the ground transponder 110, when activated, encodes, modulates and converts the operating environment data to millimeter waves based on the ground signal modulation unit 112 to obtain millimeter wave signals, and transmits the millimeter wave signals to the vehicle-mounted receiving module 120 based on the ground receiving and transmitting unit 111; the vehicle-mounted receiving module 120 receives the millimeter wave signals based on the vehicle-mounted receiving and transmitting unit 121, and performs signal restoration, demodulation and decoding processing on the millimeter wave signals based on the transponder demodulation processing unit 122 to obtain the operating environment data. Millimeter wave communication between the ground and the vehicle is realized, thereby improving the efficiency and data volume of data transmission.

[0039] On the basis of the above embodiment, optionally, the on-board receiving module 120 is used to send a wake-up signal based on the on-board receiving and sending unit during the train operation; the ground transponder 110 is used to receive the wake-up signal in real time based on the ground receiving and sending unit 111, and when the wake-up signal is received, the ground transponder 110 enters an activated state.

[0040] It can be understood that the ground transponder is arranged between the tracks, and when the train does not pass over the ground transponder, the ground transponder is in a standby state.

[0041] The wake-up signal is used to wake up the ground transponder in the standby state. In the embodiment of the present invention, the vehicle-mounted receiving module 120 sends the wake-up signal based on the vehicle-mounted receiving and sending unit during the column operation; the ground transponder 110 receives the wake-up signal in real time based on the ground receiving and sending unit 111. When the wake-up signal is received, the ground transponder 110 enters the activated state and communicates with the vehicle-mounted receiving module in the activated state.

[0042] On the basis of the above embodiment, optionally, the ground signal modulation unit 112 includes a coding subunit, a modulation subunit and a signal conversion subunit; the coding subunit is used to encode the operating environment data to obtain a cyclic code; the modulation subunit is used to modulate and encode the cyclic code to obtain a modulated signal; the signal conversion subunit includes a mixer, an intermediate frequency power amplifier, a frequency converter, a filter and a power amplifier, which are used to convert the modulated signal into millimeter waves to obtain a millimeter wave signal.

[0043] In an embodiment of the present invention, the encoding subunit based on the ground signal modulation unit 112 encodes the operating environment data to obtain a cyclic code; the modulation subunit based on the ground signal modulation unit 112 uses a preset modulation technology to modulate and encode the cyclic code to obtain a modulated signal; in the signal conversion subunit of the ground signal modulation unit 112: based on a mixer, the modulation signal is mixed with a signal generated by a local oscillator to obtain an intermediate frequency signal; based on an intermediate frequency power amplifier, the intermediate frequency signal is amplified, based on a frequency converter, the intermediate frequency signal is converted into a millimeter wave signal, based on a filter, the millimeter wave signal is filtered, and based on a power amplifier, the millimeter wave signal is amplified to obtain a final millimeter wave signal. Among them, the preset modulation technology includes but is not limited to one or more modulation methods such as amplitude modulation, frequency modulation, and phase modulation. Exemplarily, the preset modulation technology can be a 16PSK (16-Phase Shift Keying) modulation technology.

[0044] Based on the above embodiment, optionally, the transponder demodulation processing unit 122 includes a signal restoration subunit, a demodulation subunit and a decoding subunit; the signal restoration subunit includes a frequency converter, a low-noise operational amplifier, a phase shifter, a filter and a sampling decision, which is used to restore the millimeter wave signal to obtain a modulated signal; the demodulation subunit is used to demodulate the modulated signal to obtain a cyclic code; the decoding subunit is used to decode the cyclic code to obtain operating environment data.

[0045] In an embodiment of the present invention, in the signal restoration subunit of the transponder demodulation processing unit 122, the received millimeter wave signal is converted into an intermediate frequency signal based on a frequency converter. It can be understood that since the frequency of the millimeter wave signal is high, it is difficult to process it directly, so it is necessary to reduce it to the intermediate frequency range through a frequency converter for subsequent processing. Further, the converted intermediate frequency signal is amplified based on a low-noise operational amplifier. Since the signal may be interfered by attenuation and noise during transmission, it is necessary to increase the power and signal-to-noise ratio of the signal through an amplifier. Further, the phase of the intermediate frequency signal is adjusted based on a phase shifter to ensure that the phase of the signal is consistent with the original transmitted signal. During the transmission of the millimeter wave signal, the phase of the signal may change due to various factors, so it is necessary to correct it through a phase shifter. Further, the noise and interference components in the signal are removed based on a filter to improve the purity and quality of the signal. Finally, the filtered signal is sampled and judged by sampling and judgment to obtain a modulated signal. The demodulation subunit based on the transponder demodulation processing unit 122 demodulates the modulated signal to obtain a cyclic code. Among them, demodulation is the inverse process of modulation, that is, restoring the modulated signal to the original digital signal. The demodulation subunit can use the demodulation algorithm and circuit corresponding to the modulation subunit to ensure the accuracy and reliability of the demodulation process. The decoding subunit based on the transponder demodulation processing unit 122 decodes the cyclic code and restores the cyclic code to the original operating environment data.

[0046] On the basis of the above embodiment, optionally, the ground transponder 110 includes a storage unit 113, and the storage unit 113 is used to store the operating environment data; the ground transponder 110 is also used to read the operating environment data in the storage unit.

[0047] The storage unit 113 is used to store the operating environment data. In the embodiment of the present invention, the storage unit 113 is used to store the operating environment data, and the ground transponder 110 reads the operating environment data in the storage unit 113 and processes the operating environment data based on the ground signal modulation unit 112.

[0048] Based on the above embodiment, optionally, the ground transponder 110 includes a data message decoding unit 114; the ground transponder 110 is also used to receive data messages from the ground electronic unit 130, decode the data messages based on the data message decoding unit 114, obtain operating environment data, and store the operating environment data in the storage unit 113.

[0049] In an embodiment of the present invention, the ground transponder 110 and the ground electronic unit 130 are connected via a cable. The ground electronic unit 130 sends the collected data message to the ground transponder 110. The ground transponder 110 receives the data message from the ground electronic unit 130, decodes the data message based on the data message decoding unit 114, obtains the operating environment data, and stores the operating environment data in the storage unit 113.

[0050] It should be noted that the operating environment data sent by the ground electronic unit through the data message is variable information. It is understandable that if the ground transponder is an active transponder, the ground transponder includes a storage unit 113 and a data message decoding unit 114, and the storage unit 113 is used to store fixed information and variable information decoded by the data message decoding unit 114; if the ground transponder is a passive transponder, the ground transponder only includes the storage unit 113, and the storage unit 113 is used to store fixed information.

[0051] On the basis of the above embodiment, optionally, the ground electronic unit 130 is used to receive multi-source data sent by the trackside data acquisition device, integrate the multi-source data to obtain integrated data, encode the integrated data, and generate a data message.

[0052] Among them, multi-source data refers to the data sent by the data acquisition device on the side of the track to the ground electronic unit. Specifically, the multi-source data includes but is not limited to track circuits, transponders, signal status, train location information, etc. The data acquisition device includes perception sensors, monitoring sensors, detection equipment, etc. In an embodiment of the present invention, the ground electronic unit 130 receives the multi-source data sent by the trackside data acquisition device, integrates the multi-source data, and obtains integrated data. Specifically, the integration process includes data cleaning, data conversion, data fusion and other processing. Further, the integrated data is encoded, and the encoded data is encapsulated into a data message. Among them, the data message is a structured data packet. The data message includes a header, a data body, and a checksum information; the header usually contains basic information about the data message, such as the sender, the receiver, the data length, etc.; the data body contains the actual business data. The checksum information is used to ensure the integrity of the data during the transmission process.

[0053] On the basis of the above embodiment, optionally, the ground receiving and transmitting unit 111 includes a receiving antenna subunit and a transmitting antenna subunit. Figure 2 Schematic diagram of the structure of a transmitting antenna subunit provided by an embodiment of the present invention. Figure 2As shown, the transmitting antenna subunit includes at least one transmitting antenna and a curved antenna anti-diffusion surface, wherein the transmitting antenna is arranged on the concave side of the antenna anti-diffusion surface, and the antenna anti-diffusion surface is used to prevent the diffusion of the transmitting signal. In this embodiment, by providing the antenna anti-diffusion surface, the diffusion of the transmitting signal can be prevented, thereby preventing the transmitting signal from interfering with the transponder of the adjacent track.

[0054] On the basis of the above embodiment, optionally, the on-board receiving module 120 further includes a train control system communication interface unit 123 , and the on-board receiving module 120 is used to send the operating environment data to the train control system 140 through the train control system communication interface unit 123 .

[0055] The on-board receiving module 120 is an important component of the train control system 140, and is used to send the operating environment data processed by the transponder demodulation processing unit 122 to the train control system 140 through the train control system communication interface unit 123. The train control system 140 controls the train operation based on the operating environment data, such as controlling the speed, braking or acceleration of the train.

[0056] The train control system communication interface unit 123 is a key part of the on-board receiving module 120, and is used to realize the communication between the on-board receiving module 120 and the train control system 140. This interface unit ensures the accurate transmission and reception of data, and also ensures that the train control system can obtain the required data information in real time. It can be understood that the train control system communication interface unit 123 usually follows a specific communication protocol to ensure that the data transmission and reception process is stable and reliable. The communication protocol includes a wired communication protocol or a wireless communication protocol. Specifically, the wired communication protocol includes but is not limited to RS-485, CAN bus, etc., and the wireless communication protocol includes but is not limited to GSM-R, Wi-Fi, etc.

[0057] In the technical solution of this embodiment, when the ground transponder is activated, the ground signal modulation unit encodes, modulates and converts the operating environment data into millimeter wave to obtain a millimeter wave signal, and transmits the millimeter wave signal to the vehicle-mounted receiving module based on the ground receiving and transmitting unit; the vehicle-mounted receiving module receives the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit, and performs signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit to obtain the operating environment data. Realizing millimeter wave communication between the ground transponder and the vehicle-mounted receiving module can improve the efficiency and amount of data transmission between the vehicle and the ground.

[0058] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0059] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A railway transponder communication system based on millimeter wave signals, characterized in that: include: A ground transponder and a vehicle-mounted receiving module, wherein the ground transponder comprises a ground receiving and transmitting unit and a ground signal modulation unit, and the vehicle-mounted receiving module comprises a vehicle-mounted receiving and transmitting unit and a transponder demodulation processing unit; The ground transponder is used to encode, modulate and convert the operating environment data into millimeter waves based on the ground signal modulation unit in an activated state to obtain a millimeter wave signal, and transmit the millimeter wave signal to the vehicle-mounted receiving module based on the ground receiving and transmitting unit; The vehicle-mounted receiving module is used to receive the millimeter wave signal based on the vehicle-mounted receiving and transmitting unit, and perform signal restoration, demodulation and decoding processing on the millimeter wave signal based on the transponder demodulation processing unit to obtain the operating environment data.

2. The method according to claim 1, characterized in that The vehicle-mounted receiving module is used to send a wake-up signal based on the vehicle-mounted receiving and sending unit during the operation of the train; The ground transponder is used to receive the wake-up signal in real time based on the ground receiving and sending unit. When the wake-up signal is received, the ground transponder enters an activated state.

3. The method according to claim 1, characterized in that The ground signal modulation unit includes a coding subunit, a modulation subunit and a signal conversion subunit; The encoding subunit is used to encode the operating environment data to obtain a cyclic code; The modulation subunit is used to modulate and encode the cyclic code to obtain a modulated signal; The signal conversion subunit includes a mixer, an intermediate frequency power amplifier, a frequency converter, a filter and a power amplifier, and is used to perform millimeter wave conversion on the modulated signal to obtain a millimeter wave signal.

4. The method according to claim 1, characterized in that The transponder demodulation processing unit includes a signal restoration subunit, a demodulation subunit and a decoding subunit; The signal restoration subunit includes a frequency converter, a low-noise operational amplifier, a phase shifter, a filter and a sampling decision, and is used to restore the millimeter wave signal to obtain a modulated signal; The demodulation subunit is used to demodulate the modulated signal to obtain a cyclic code; The decoding subunit is used to decode the cyclic code to obtain operating environment data.

5. The method according to claim 1, characterized in that The ground transponder includes a storage unit, and the storage unit is used to store operating environment data; The ground transponder is also used to read the operating environment data in the storage unit.

6. The method according to claim 5, characterized in that The ground transponder includes a data message decoding unit; The ground transponder is also used for receiving data messages from the ground electronic unit, decoding the data messages based on the data message decoding unit to obtain operating environment data, and storing the operating environment data in the storage unit.

7. The method according to claim 6, characterized in that The ground electronic unit is used to receive multi-source data sent by the trackside data acquisition device, integrate the multi-source data to obtain integrated data, encode the integrated data, and generate a data message.

8. The method according to claim 6, characterized in that The ground transponder and the ground electronic unit are connected via a cable.

9. The method according to claim 1, characterized in that: The ground receiving and transmitting unit comprises a transmitting antenna subunit, wherein the transmitting antenna subunit comprises at least one transmitting antenna and a curved antenna anti-diffusion surface, wherein the transmitting antenna is arranged on the concave side of the antenna anti-diffusion surface.

10. The method according to claim 1, characterized in that The on-board receiving module also includes a train control system communication interface unit, and the on-board receiving module is used to send the operating environment data to the train control system through the train control system communication interface unit.

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