CN116390059A - Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network - Google Patents

Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network Download PDF

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Publication number
CN116390059A
CN116390059A CN202310384919.4A CN202310384919A CN116390059A CN 116390059 A CN116390059 A CN 116390059A CN 202310384919 A CN202310384919 A CN 202310384919A CN 116390059 A CN116390059 A CN 116390059A
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delay
wireless communication
vehicle
communication network
ground
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CN202310384919.4A
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Chinese (zh)
Inventor
胡天浩
赵恒凯
郑国莘
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Priority to CN202310384919.4A priority Critical patent/CN116390059A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to a method, equipment and medium for correcting transmission delay errors of a vehicle-ground wireless communication network, which are used for correcting the transmission delay of the vehicle-ground wireless communication network respectively connected with a vehicle side and a ground side, wherein the method comprises the following steps: acquiring a first time delay of the vehicle side and the ground side in direct connection; acquiring a second time delay when the vehicle side is connected with the ground side through the vehicle-ground wireless communication network, and acquiring uncorrected time delay based on the first time delay and the second time delay; and acquiring a third time delay of the vehicle side and the ground side in direct connection, acquiring a speed difference compensation value based on the first time delay and the third time delay, and performing error correction based on the uncorrected time delay and the speed difference compensation value to acquire corrected transmission time delay of the vehicle-ground wireless communication network. Compared with the prior art, the invention has the advantages of accurate correction, high speed and the like.

Description

Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network
Technical Field
The invention relates to the field of rail traffic communication, in particular to a method, equipment and medium for correcting transmission delay errors of a train-ground wireless communication network.
Background
The high-speed magnetic levitation train-ground wireless communication system mainly comprises a train positioning system, a running control vehicle-mounted wireless control unit, a train-ground wireless communication network, a partition wireless control unit and a traction control system motor control unit. The safe and stable operation of the high-speed maglev train is based on the normal operation of the train-ground wireless communication system. The train-ground wireless communication system realizes bidirectional, high-speed, real-time and reliable wireless transmission between the train and the ground fixed equipment, and meets the transmission requirements of an operation control system, a traction control system, an operation voice communication system, a diagnosis system and an auxiliary information system. In order to check whether the performance of the train-ground wireless communication system can meet the requirements of the high-speed magnetic levitation running control system and the train-ground wireless communication system and ensure the running safety of a train, the technical specification requirements of the 600km/h high-speed magnetic levitation line running control system and the train-ground wireless communication system need to be developed, and the system can be used for a key performance test system for on-site actual measurement. Meanwhile, research on a reasonable evaluation method of key performances of the high-speed magnetic levitation operation control system and the train-ground wireless communication system is carried out, and a technical basis is provided for evaluation of the high-speed magnetic levitation system. The current test tool for measuring time delay cannot meet the interface and protocol of a high-speed magnetic levitation line operation control system based on 600km/h and a train-ground wireless communication system, and cannot meet the high-precision time delay test requirement of 0.1 ms.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a transmission delay error correction method, equipment and medium for a train-ground wireless communication network, so as to solve or partially solve the problem that the conventional delay test method cannot meet the requirement of transmission delay error correction in a high-speed magnetic levitation train-ground wireless communication scene.
The aim of the invention can be achieved by the following technical scheme:
in one aspect of the present invention, there is provided a transmission delay error correction method for a vehicle-to-ground wireless communication network, for correcting transmission delays of the vehicle-to-ground wireless communication network respectively connected to a vehicle side and a ground side, the method comprising the steps of:
acquiring a first time delay of the vehicle side and the ground side in direct connection;
acquiring a second time delay when the vehicle side is connected with the ground side through the vehicle-ground wireless communication network, and acquiring uncorrected time delay based on the first time delay and the second time delay;
and acquiring a third time delay of the vehicle side and the ground side in direct connection, acquiring a speed difference compensation value based on the first time delay and the third time delay, and performing error correction based on the uncorrected time delay and the speed difference compensation value to acquire corrected transmission time delay of the vehicle-ground wireless communication network.
As a preferred technical solution, the acquiring of the first delay and the third delay includes the following steps:
the method comprises the steps of setting a direct-connection test auxiliary unit which is respectively connected with the vehicle side and the ground side, wherein the direct-connection test auxiliary unit is connected with the vehicle side and the ground side in a wired manner;
the direct connection test auxiliary unit sends a control signal to the vehicle side and the ground side, the vehicle side or the ground side sends clock counting information, and the ground side or the vehicle side receives the clock counting information and then obtains the first time delay or the third time delay based on clock speed difference of two sides.
As an optimal technical scheme, RS485 connection is adopted between the direct connection test auxiliary unit and the vehicle side and between the direct connection test auxiliary unit and the ground side.
As an preferable technical scheme, the vehicle side is specifically a positioning unit connected with the operation control vehicle-mounted radio control unit, and the ground side is specifically a traction control system motor control unit connected with the partition radio control unit.
As an optimal technical scheme, the positioning unit and the motor control unit of the guidance control system comprise FPGA.
As a preferable technical scheme, the obtaining of the speed difference compensation value includes the following steps:
and acquiring the speed difference between the third time delay and the first time delay, and acquiring the speed difference compensation value in unit time based on the time from the start of acquiring the first time delay to the current time.
As a preferable technical scheme, the method further comprises the following steps:
and storing and outputting statistical parameters including average delay, maximum delay and minimum delay to a visual terminal based on the first delay, the second delay, the third delay, the uncorrected delay and the corrected wireless communication network transmission delay.
As an preferable technical scheme, the corrected transmission delay of the vehicle-ground wireless communication network is obtained by adopting the following formula:
E C ＝E-E 0 /(T 22 -T 10 )
wherein E is C For the corrected transmission delay of the vehicle-ground wireless communication network, E is the uncorrected delay, E 0 T is the difference between the third delay and the first delay 10 To start acquiring the starting time of the first delay, T 22 To obtain the time of the third delay.
In another aspect of the present invention, there is provided an electronic apparatus including: the system comprises one or more processors and a memory, wherein one or more programs are stored in the memory, and the one or more programs comprise instructions for executing the train-ground wireless communication network transmission delay error correction method.
In another aspect of the invention, a computer readable storage medium is provided that includes one or more programs for execution by one or more processors of an electronic device, the one or more programs including instructions for performing the above-described method of vehicular-to-ground wireless communication network transmission delay error correction.
Compared with the prior art, the invention has the following advantages:
(1) Correct accurately, fast: according to the method, firstly, the clock speed difference between the vehicle side and the ground side is obtained as first time delay, then the clock speed difference between the vehicle side and the ground side in the vehicle-ground wireless communication network is obtained as second time delay, so that uncorrected vehicle-ground wireless communication network transmission time delay is obtained, then the clock speed difference between the vehicle side and the ground side is obtained as third time delay, a speed difference compensation value is calculated to correct the vehicle-ground wireless communication network transmission time delay, and compared with the problem that the counting is inaccurate due to the fact that the clock offset of the measuring equipment per se exists in the existing method, the time delay calculation result is affected.
(2) The hardware structure is simple: the method adds the direct connection test auxiliary units respectively connected with the vehicle side and the ground side on the original structure of the high-speed magnetic levitation vehicle ground wireless communication system to obtain the direct connection clock speed difference data, and has the advantages of simple structure and low cost.
Drawings
Fig. 1 is a schematic structural diagram of each part in the transmission delay error correction method of the train-ground wireless communication network in embodiment 1;
fig. 2 is a schematic diagram of a connection structure of a train-ground wireless communication network, a running control vehicle-mounted radio control unit and a partition radio control unit;
FIG. 3 is a schematic diagram of a high-precision time delay calculation;
fig. 4 is a structure diagram of the interface connection between the transmitting unit and the receiving unit for converting the RS485 signal and the DB 25;
figure 5 is a structure diagram of the interface connection between the direct connection test auxiliary unit converted RS485 signal and the DB25,
the system comprises a vehicle-mounted radio control unit 1, a vehicle-mounted radio control unit 2, a partition radio control unit 3, a sending unit 4, a receiving unit 5 and a direct connection test auxiliary unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
As shown in fig. 1, the present embodiment provides a method for correcting transmission delay errors of a vehicle-to-ground wireless communication network, which adopts a transmitting unit 3 (FPGA 1), a receiving unit 4 (FPGA 2), a direct-connection test auxiliary unit 5 (FPGA 3) and a high-precision delay algorithm matched with the direct-connection test auxiliary unit to run on a portable computer, so as to solve the problem that the existing delay test software cannot meet the requirements of delay test tools of a high-speed magnetic levitation running control system and interfaces and protocols of the vehicle-to-ground wireless communication system.
In the present embodiment, the wireless communication network 6 is used between the high-speed maglev train lands to connect the operation control vehicle-mounted radio control unit 1 and the partition radio control unit 2, satisfying the structure shown in fig. 2. And each physical interface of the operation control vehicle-mounted radio control unit 1 and the partition radio control unit 2 and the train positioning system and the traction control system respectively adopts an RS-485 interface mode. The information frame format adopts a character-oriented transmission protocol, and the total length of each information frame is a fixed byte number, and follows a fixed coding mode of a system.
The method comprises the following specific implementation processes:
the transmission unit 3 (FPGA 1) and the receiving unit 4 (FPGA 2) are used for respectively simulating or replacing a positioning unit connected with the operation control vehicle-mounted radio control unit 1 and a traction control system motor control unit connected with the partition radio control unit 2, accessing the vehicle-ground wireless communication network 6, receiving and transmitting clock counting information through RS-485, and testing the transmission delay of the vehicle-ground wireless communication network 6.
The transmitting unit 3 transmits clock count information to the operation control vehicle-mounted radio control unit 1 after receiving the control signal transmitted from the operation control vehicle-mounted radio control unit 1, matching the operation timing of the operation control vehicle-mounted radio control unit 1.
Matching the working time sequence of the partition radio control unit 2, the receiving unit 4 starts working after receiving the control signal sent by the partition radio control unit 2, receives the clock count information sent by the sending unit 3, records the clock count information of the receiving end, sends the sending clock count information of the sending unit 3 and the recorded receiving clock count information to the portable computer end through a serial port, and the portable computer end uses a serial port debugging tool to save the clock count data packet sent by the receiving unit 4.
In order to eliminate the system error, a direct connection test auxiliary unit 5 (FPGA 3) is developed for controlling the transmitting unit 3 and the receiving unit 4 by the direct connection data transmission link, the analog operation control vehicle-mounted radio control unit 1 and the partition radio control unit 2 so as to perform the inherent delay difference of the direct connection test system. The data signals of the transmitting unit 3 and the receiving unit 4 are shorted inside the direct connection test auxiliary unit 5. After the work trigger key on the direct connection test auxiliary unit 5 is pressed, the direct connection test auxiliary unit 5 sends control signals to the sending unit 3 and the receiving unit 4 so that the two ends start to send and record clock counting information. The connection method of the FPGA and the wireless communication network connected with the train-ground and the direct connection test is shown in figure 1.
The three FPGA devices mainly comprise an FPGA with the model of EP4CE6F17C8, a 16Mbit FLASH, a 50M crystal oscillator, a USB power supply interface, a serial port, a power switch, a battery holder, a JTAG interface, a key and a reset key. The three FPGAs perform level conversion through MAX485E chips in a connection mode shown in fig. 4 and 5, so that the FPGAs can normally transmit RS-485 signals required by a matching system through a DB25 connector. Fig. 4 (a) shows a structure in which a transmitting unit converts an RS485 signal to interface with DB25, and (b) shows a structure in which a receiving unit converts an RS485 signal to interface with DB 25.
In the direct connection test connection method shown in fig. 1, a direct connection test auxiliary unit 5 is connected with a sending unit 3 and a receiving unit 4 through RS-485 to form a direct connection system. The switch on the direct connection test auxiliary unit 5 is pressed down, a command is sent to enable the time delay test system to start working, a certain time is operated to measure the average inherent time delay E of the first group of system clocks 10 Stored as a data file at the portable computer.
The state of the previous equipment is kept to run for a few minutes without power failure, and then the direct connection test auxiliary sheet is usedThe element 5 is connected with the sending unit 3 and the receiving unit 4 through RS-485 to form a direct connection system. The time delay test system automatically starts to work, and runs for a certain time to measure the average inherent time delay E of the second group of system clocks 11 The portable computer is saved as a data file.
The inherent error of the system can be measured by the above two steps, and the measured error can be stored in a data processing computer for long-time use, such as long-time unused equipment, and the measurement calibration of the above steps can be carried out again.
As shown in FIG. 1, the method for connecting the wireless communication network of the vehicle-ground access is characterized in that a transmitting unit 3 (FPGA 1) and a receiving unit 4 (FPGA 2) are connected with the wireless communication network of the vehicle-ground to be tested through RS-485. The time delay E after the vehicle-ground wireless communication network is obtained after the vehicle-ground wireless communication network is operated for a certain time 20 Stored as a data file at the portable computer.
The data processing software which is pre-written by using a high-precision time delay test principle on the portable computer is used, and the data file stored by three times of measurement is imported into the software, so that a measured time delay curve of the train-ground wireless communication network can be automatically drawn, statistical parameters such as average time delay, maximum time delay, minimum time delay and the like can be displayed, and measurement data can be stored for analysis.
As shown in fig. 3, the high-precision delay correction principle is as follows:
1)T 10 at the moment, the transmitting unit 3 (FPGA 1) and the receiving unit 4 (FPGA 2) are subjected to direct connection test with the direct connection test auxiliary unit 5 (FPGA 3) through RS-485. The transmitting unit 3 transmits the transmitting clock counting information, the receiving unit 4 transmits the transmitting clock counting information and the receiving clock counting information to the portable computer after receiving the data, and the system clock average inherent delay E is obtained after running for a certain time 10 ；
2) The transmitting unit element 3 and the receiving unit 4 are connected with a wireless communication network of the ground of the vehicle to be tested through RS-485, and the positioning unit connected with the operation control vehicle-mounted radio control unit and the traction control system motor control unit connected with the partition radio control unit are respectively simulated and replaced by the transmitting unit 3 (FPGA 1) and the receiving unit 4 (FPGA 2). The transmitting unit 3 transmits the transmission clock count information, and the receiving unit 4 is connectedAfter receiving the information, the receiving unit transmits the information of the sending clock count and the information of the receiving clock count to the portable computer, and the time delay E after passing through the vehicle-ground wireless communication network is obtained after running for a certain time 20 ；
3)E 20 -E 10 E, obtaining a transmission delay of the train-ground wireless communication network;
4)T 12 at the moment, the device keeps the running state of the previous device without power failure, and the sending unit 3 and the receiving unit 4 are directly connected with the direct connection test auxiliary unit 5 through RS-485. The transmitting unit 3 transmits the transmitting clock counting information, the receiving unit 4 transmits the transmitting clock counting information and the receiving clock counting information to the portable computer after receiving the data, and the system clock average inherent delay E is obtained after running for a certain time 11 After the FPGA operates for a period of time, a clock of the FPGA has certain offset, so that inaccurate counting is caused, a time delay calculation result is influenced, and the precision is low, so that a love test is needed again after the FPGA is connected into a vehicle-ground wireless communication network for actual measurement, the offset is eliminated, and the most accurate time delay result is obtained;
5)E 11 -E 10 ＝E 0 obtaining the test system receiving and transmitting clock in the test period T 10 To T 22 Speed difference E of (2) 0 ；
6)E 0 /(T 22 -T 10 )＝E e Obtaining a speed difference compensation value in unit time;
7) Error correction is carried out on the transmission delay of the train-ground wireless communication network, and high-precision delay is obtained: e (E) C ＝E-E e Thereby achieving correction.
The method aims at system requirements and provides a network transmission delay error correction method taking the FPGA as a core, and the method has the advantages of stable transmission, accurate correction, high speed, rich functions and convenient operation, and can meet the requirements of high-precision delay test.
Example 2
The present embodiment provides an electronic device, including: one or more processors and a memory, wherein the memory stores one or more programs, the one or more programs including instructions for performing the method for correcting transmission delay errors of a train-ground wireless communication network as described in embodiment 1.
Example 3
The present embodiment provides a computer-readable storage medium including one or more programs for execution by one or more processors of an electronic device, the one or more programs including instructions for performing the method for transmission delay error correction of a train-ground wireless communication network as described in embodiment 1.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A method for correcting transmission delay errors of a vehicle-to-ground wireless communication network, which is used for correcting transmission delay of the vehicle-to-ground wireless communication network respectively connected with a vehicle side and a ground side, the method comprising the following steps:
acquiring a first time delay of the vehicle side and the ground side in direct connection;
acquiring a second time delay when the vehicle side is connected with the ground side through the vehicle-ground wireless communication network, and acquiring uncorrected time delay based on the first time delay and the second time delay;
and acquiring a third time delay of the vehicle side and the ground side in direct connection, acquiring a speed difference compensation value based on the first time delay and the third time delay, and performing error correction based on the uncorrected time delay and the speed difference compensation value to acquire corrected transmission time delay of the vehicle-ground wireless communication network.
2. The method for correcting transmission delay error of a vehicle-to-ground wireless communication network according to claim 1, wherein the acquiring of the first delay and the third delay comprises the steps of:
the method comprises the steps of setting a direct-connection test auxiliary unit which is respectively connected with the vehicle side and the ground side, wherein the direct-connection test auxiliary unit is connected with the vehicle side and the ground side in a wired manner;
the direct connection test auxiliary unit sends a control signal to the vehicle side and the ground side, the vehicle side or the ground side sends clock counting information, and the ground side or the vehicle side receives the clock counting information and then obtains the first time delay or the third time delay based on clock speed difference of two sides.
3. The method for correcting transmission delay errors of a vehicle-to-ground wireless communication network according to claim 2, wherein RS485 connection is adopted between the direct connection test auxiliary unit and the vehicle side and between the direct connection test auxiliary unit and the ground side.
4. The method for correcting transmission delay errors of a vehicle-to-ground wireless communication network according to claim 1, wherein the vehicle side is a transmitting unit, and the ground side is a receiving unit.
5. The method for correcting transmission delay errors of a train-ground wireless communication network according to claim 4, wherein the positioning unit and the motor control unit of the pilot control system comprise FPGAs.
6. The method for correcting transmission delay error of a train-ground wireless communication network according to claim 1, wherein the obtaining of the speed difference compensation value comprises the steps of:
and acquiring the speed difference between the third time delay and the first time delay, and acquiring the speed difference compensation value in unit time based on the time from the start of acquiring the first time delay to the current time.
7. The method for correcting transmission delay errors of a train-ground wireless communication network according to claim 1, further comprising the steps of:
and storing and outputting statistical parameters including average delay, maximum delay and minimum delay to a visual terminal based on the first delay, the second delay, the third delay, the uncorrected delay and the corrected wireless communication network transmission delay.
8. The method for correcting transmission delay error of a vehicle-to-ground wireless communication network according to claim 1, wherein the corrected transmission delay of the vehicle-to-ground wireless communication network is obtained by adopting the following formula:
E C ＝E-E 0 /(T 22 -T 10 )
wherein E is C For the corrected transmission delay of the vehicle-ground wireless communication network, E is the uncorrected delay, E 0 T is the difference between the third delay and the first delay 10 To start acquiring the starting time of the first delay, T 22 To obtain the time of the third delay.
9. An electronic device, comprising: one or more processors and a memory, the memory having stored therein one or more programs, the one or more programs comprising instructions for performing the method of transmission delay error correction for a vehicular-to-ground wireless communication network of any of claims 1-8.
10. A computer readable storage medium comprising one or more programs for execution by one or more processors of an electronic device, the one or more programs comprising instructions for performing the method of propagation delay error correction for a vehicular-to-ground wireless communication network of any one of claims 1-8.
CN202310384919.4A 2023-04-12 2023-04-12 Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network Pending CN116390059A (en)

Priority Applications (1)

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CN202310384919.4A CN116390059A (en) 2023-04-12 2023-04-12 Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310384919.4A CN116390059A (en) 2023-04-12 2023-04-12 Method, equipment and medium for correcting transmission delay error of train-ground wireless communication network

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CN116390059A true CN116390059A (en) 2023-07-04

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