CN115913362B - System for carrying out ground data dump by using wireless optical communication - Google Patents
System for carrying out ground data dump by using wireless optical communication Download PDFInfo
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Abstract
The invention provides a system for carrying out train ground data dump by using wireless optical communication, which solves the problems that the vehicle-mounted equipment on a rail transit vehicle generates mass data more than 1TB in the running period of a train, the dump duration is too long and the train operation flow is seriously influenced; the invention uses the wireless optical communication technical scheme to carry out data dump, exchanges the position information of the vehicle-mounted FSO terminal and the position information of the ground FSO terminal through a wireless network, adjusts the pointing direction of the FSO terminal through a brushless direct current servo holder respectively, and assists the FSO terminal to complete automatic focusing; the high-speed buffer device is adopted to send registration information to the server platform for registration, and the running state information is reported, so that the data is dumped to the ground data center in the limited stop time of the train; the data dump rate is more than 10 times of the data dump rate of the common network, so that the rapid landing efficiency of a large amount of data through the wireless communication network is improved, and the accident occurrence is analyzed and prevented in time. The invention is suitable for rail transit.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a system for carrying out ground data dump by using wireless optical communication.
Background
The existing data transmission modes in the rail transit field mainly comprise a cellular network 2G mode, a cellular network 4G mode, a WIFI mode and a 5G millimeter wave mode; the coverage radius of the base station of the private network of the cellular network 2G is 10Km, the furthest available coverage range is expanded to 36Km, and the theoretical maximum speed is only 64kbps although the coverage range is wide, so that the method is suitable for transmission and interaction of small data volume and real-time data;
the coverage radius of the cellular network 4G private network base station is within 3Km, and is much smaller than the coverage of the 2G private network, the theoretical highest rate is 100Mbps, and the cellular network base station is suitable for small data volume, real-time data transmission and interaction.
The coverage radius of the AP in the WIFI mode is within 200 meters, the theoretical highest transmission rate can reach 1000Mbps, and the switching process can cause link interruption due to the fact that the coverage is small and switching between the APs is not supported, but single-point deployment is low in price.
In a 5G millimeter wave mode, the coverage radius of a private network RBS base station is within 300 meters, and the theoretical highest transmission rate is 1.7Gbps; the vision distance is propagated, the shielding interference is easy to be received, the contact net near the track is dense, the electromagnetic environment is complex, and the electromagnetic interference and the reflection interference are easy to be received. The method can be used for dumping big data, and the dumping speed of the data in actual use is about 10GBps in 1 minute. If the size of the data to be dumped is within 300GB, the data can be dumped within 30 minutes, and the operation flow of the train is not affected; if the data to be dumped exceeds 1TB, the dump process lasts too long, and the train operation flow is seriously affected.
The free space optical communication FSO (Free Space Optics) is an optical communication system that transmits an optical signal by using the atmosphere instead of an optical fiber, and is a combination of optical fiber communication and wireless communication. The transmission distance can reach 4Km by adopting 1528-1565 nanometer infrared light wave laser technology, and the transmission rate can reach 10Gbps within 1 Km. Starting from the crew section, a transportation task is executed once, and then the crew section is returned to the crew section, which is called a 'road crossing'. For a comprehensive inspection vehicle and a vehicle with 3C detection operation, the data to be dumped in one road-crossing operation is 500-600 GB, even more than 1TB, and the data dump time can be greatly shortened by using the FSO free space optical communication technology.
Disclosure of Invention
The invention provides a system for carrying out ground data dump by using wireless optical communication, which solves the problems that in the field of rail transit, the running time of a vehicle is long, the parking time is short, and a large amount of data is generated by vehicle-mounted equipment during the running of a train. By using a wireless optical communication (FSO) technology to establish a communication link, the invention can provide ultra-high bandwidth of 10Gpbs and can well realize the purpose of rapid landing of a large amount of data in limited stopping time of a train.
The invention provides a system for carrying out ground data dump by using wireless optical communication, which comprises vehicle equipment and ground equipment, wherein the vehicle equipment comprises a data source, a high-speed buffer device, a vehicle-mounted brushless direct current servo holder and a vehicle-mounted FSO terminal, and the high-speed buffer device is respectively connected with the vehicle-mounted brushless direct current servo holder, the vehicle-mounted FSO terminal and the data source through Ethernet;
the ground equipment comprises a data storage NAS, a server platform, a ground brushless direct current servo holder and a ground FSO terminal, wherein the server platform is respectively connected with the ground brushless direct current servo holder, the data storage NAS and the ground FSO terminal through an Ethernet; the server platform and the ground brushless direct current servo cradle head are connected through a CAN bus to form a closed-loop control system;
the cache device downloads data from the data source and stores the downloaded data into a hard disk of the cache device; the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured position information of the ground FSO terminal, and sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network;
after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the ground brushless direct current servo cradle head receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus, and adjusts the pointing direction of the ground FSO terminal;
After the server platform obtains the position information of the ground brushless direct current servo cradle head through the CAN bus, the server platform sends an instruction to the ground brushless direct current servo cradle head to finely adjust the pointing direction of the ground FSO terminal;
the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device sends registration information to the server platform for registration, and the cache device starts to transmit data to the server platform after the registration.
Preferably, the cache means downloads data from the data source and stores the downloaded data in a hard disk of the cache means; the method specifically refers to that downloaded data is stored in a hard disk of a cache device for buffering, the data source generates operation data by different types of vehicle-mounted equipment installed on a train, and the data source comprises: 6A video data, 6A driving safety data, 3C data and comprehensive detection data;
the downloading mode comprises an ftp file transfer protocol client program, an sftp secure file transfer protocol client program, a scp secure remote file copy and an rsync remote synchronous downloading mode.
Preferably, the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured ground FSO terminal position information, and sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network, specifically, when the high-speed buffer device detects that the position information of the vehicle-mounted FSO terminal is within the preset distance threshold range from the ground FSO terminal before sending the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network, the high-speed buffer device sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network; meanwhile, the high-speed buffer device sends out an instruction to start power supply to the vehicle-mounted FSO terminal;
The position information of the vehicle-mounted FSO terminal is obtained through a Beidou differential module configured by a high-speed buffer device or obtained through a wireless beacon mode;
the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured ground FSO terminal position information, specifically, the high-speed buffer device calculates the offset angle of the vehicle-mounted FSO terminal according to the configured ground FSO terminal position information, and adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head;
the method comprises the steps of calculating the offset angle of a vehicle-mounted FSO terminal relative to a ground FSO terminal, and obtaining the offset angle of the vehicle-mounted FSO terminal by a method of calculating an azimuth angle, wherein the offset angle of the vehicle-mounted FSO terminal is as follows:
a = arctan(|dy/dx|)；
the coordinate increment dx=x '-x and the coordinate increment dy=y' -y are two-point coordinate components of the coordinates A (x, y) of the vehicle-mounted FSO terminal equipment and the coordinates B_1 (x ', y') of the ground FSO terminal equipment subtracted.
Preferably, after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the method specifically comprises the steps that after receiving position information of a vehicle-mounted FSO terminal, a server platform calculates an offset angle of the ground FSO terminal, the server platform starts power supply for the ground FSO terminal through an instruction, sends the offset angle of the ground FSO terminal to a ground brushless direct current servo holder, and the ground brushless direct current servo holder adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor;
After receiving the position information of the vehicle-mounted FSO terminal, the server platform calculates the offset angle of the ground FSO terminal, and obtains the offset angle of the ground FSO terminal by adopting a method of calculating an azimuth angle, wherein the offset angle of the ground FSO terminal is the offset angle of the ground FSO terminal relative to the vehicle-mounted FSO terminal;
defining the coordinates of the ground FSO terminal equipment as A (x, y) and the coordinates of the vehicle-mounted FSO terminal equipment as B_1 (x ', y'), and calculating the subtraction of two-point coordinate components to obtain a coordinate increment dx=x '-x, dy=y' -y;
if the coordinate increment dx, the coordinate increment dy is not zero; then the quadrant angle a=arctan (|dy/dx|) is calculated in degrees;
when the coordinate increment dx >0, the coordinate increment dy >0, azimuth = a;
azimuth = 180 ° -a when coordinate increment dx <0, coordinate increment dy > 0;
azimuth = 180 ° + a when the coordinate increment dx <0, the coordinate increment dy < 0;
azimuth = 360 ° -a when coordinate increment dx >0, coordinate increment dy < 0;
the ground brushless direct current servo cradle head receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus and adjusts the pointing direction of the ground FSO terminal, and specifically, the ground brushless direct current servo cradle head adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor; when the deviation angle a of the ground FSO terminal is less than or equal to 1 degree, further fine tuning is performed.
Preferably, when the deviation angle a of the ground FSO terminal is smaller than or equal to 1 degree, further fine tuning is performed, specifically, the server platform obtains the position information of the ground brushless direct current servo cradle head through the CAN bus, and sends an instruction to the ground brushless direct current servo cradle head to fine tune the pointing direction of the ground FSO terminal through the CAN bus; the fine tuning is realized by connecting a server platform and a ground brushless direct current servo holder through a CAN bus to form a closed-loop control system, repeatedly acquiring position information through the server platform and the ground brushless servo holder, repeatedly adjusting an offset angle, and finishing fine tuning of the pointing direction of a ground FSO terminal relative to a vehicle-mounted FSO terminal when the final offset angle a is smaller than 0.01 DEG, wherein the vehicle-mounted FSO terminal and the ground FSO terminal finish tracking and focusing through respective self-contained laser shafts; the position information of the fine adjustment of the ground brushless direct current servo cradle head comprises position precision and angle adjustment precision.
Preferably, the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, and the system further comprises a high-speed buffer device which sends an automatic tracking starting instruction to the vehicle-mounted FSO terminal through the Ethernet, meanwhile, the server platform sends the automatic tracking starting instruction to the ground FSO terminal through the Ethernet, and the vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing processes by calculating the maximum light input point and adjusting the offset angle of the laser axis of the vehicle-mounted FSO terminal and the laser axis of the ground FSO ground terminal;
The vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing by calculating the maximum light input point and adjusting the offset angle of the laser axis of the vehicle-mounted FSO terminal and the laser axis of the ground FSO ground terminal, specifically, the vehicle-mounted FSO terminal receives the ground FSO terminal laser signal, meanwhile, the ground FSO terminal receives the vehicle-mounted FSO terminal laser signal, the vehicle-mounted FSO terminal equipment and the ground FSO terminal equipment respectively obtain the received light power, and after the vehicle-mounted FSO terminal and the ground FSO terminal respectively receive the light power of the opposite end according to the size of the error rate, the maximum light input point obtained by the vehicle-mounted FSO terminal and the ground FSO terminal is calculated, and when the vehicle-mounted FSO terminal and the ground FSO terminal obtain the maximum light input point, the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing;
the maximum optical input point is obtained when the error rate is smaller than 1E-12; error rate = number of errors in transmission/total number of codes transmitted 100%;
after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device starts to transmit data to the server platform after registering with the server platform.
Preferably, after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device starts to transmit data to the server platform after registering, specifically, after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device reports the running state information of the cache device to the server platform when applying for registering to the server platform; after the registration is passed, the cache device starts an lftp file client program or an ftp file transfer protocol client program to start data transmission to a server platform; the running state information of the high-speed buffer device comprises the power-on time, the power-off time and the disk occupancy rate of the vehicle-mounted equipment.
Preferably, after the registration, the cache device starts the lftp file client program or the ftp file transmission protocol client program to start data transmission to the server platform, and the method further comprises the step that if the n-1 data is not transmitted, the cache device continues to transmit the breakpoint until the data transmission to the server platform is completed, and the cache device starts the n-th data transmission to the server platform.
Preferably, the cache device starts the nth data transmission to the server platform, namely, the server platform directly stores the data into the data storage NAS after receiving the data, and judges whether a data file to be transmitted exists or not according to the data transmission progress information reported by the receiving cache device; the data transmission progress information comprises the file size of the nth data transmission, the number and the size of the remaining files to be transmitted;
after the data transmission is completed, the high-speed buffer device turns off the power supply of the vehicle-mounted equipment through an instruction, and the vehicle-mounted FSO terminal is turned off; the server platform turns off the power supply of the ground equipment by the instruction, and the ground FSO terminal is turned off; the lftp file client program or the ftp file transfer protocol client program is disconnected.
Preferably, the high-speed buffer device comprises a data storage buffer module, a data processing module, a Beidou differential positioning module and an interface module;
The data storage buffer module is used for storing data with the reading speed of more than 1500 MB/s;
the data processing module is used for carrying out calculation processing on the data based on the edge computer with calculation capability;
the Beidou differential positioning module is used for acquiring accurate position information of the vehicle-mounted FSO terminal;
the interface module is used for at least more than one tera-network port and n giga-network ports of the output port of the cache device, and dumping the collected running data of the vehicle-mounted equipment to the server platform through the lftp client program or the ftp file transmission protocol client program.
The embodiment of the invention provides a system for carrying out train ground data dump by using wireless optical communication, which solves the problems that the vehicle-mounted equipment on a rail transit vehicle generates mass data more than 1TB in the train running period, the dump duration is too long and the train operation flow is seriously influenced; the invention uses the wireless optical communication technical scheme to carry out data dump, exchanges the position information of the vehicle-mounted FSO terminal and the position information of the ground FSO terminal through a wireless network, adjusts the pointing direction of the FSO terminal through a brushless direct current servo holder respectively, and assists the FSO terminal to complete automatic focusing; the high-speed buffer device is adopted to send registration information to the server platform for registration, and the running state information is reported, so that the data is dumped to the ground data center in the limited stop time of the train; the data dump rate is more than 10 times of the data dump rate of the common network, so that the rapid landing efficiency of a large amount of data through the wireless communication network is improved, and the accident occurrence is analyzed and prevented in time.
Drawings
FIG. 1 is a block diagram of a system for performing a data dump of a vehicle location using wireless optical communications;
FIG. 2 is a system flow diagram of a data dump of a vehicle using wireless optical communications;
FIG. 3 is a schematic diagram of a system for performing a ground data dump using wireless optical communications based on the perspective of a ground FSO terminal device;
fig. 4 is a schematic diagram of a system for performing a data dump of a vehicle ground using wireless optical communication based on a vehicle-mounted FSO terminal device perspective.
Detailed Description
Exemplary embodiments will be described in detail herein, with exemplary flows being illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.
Example 1
The system for carrying out ground data dump by using wireless optical communication provided by the embodiment of the invention comprises vehicle equipment and ground equipment, wherein the vehicle equipment comprises a data source, a high-speed buffer device, a vehicle-mounted brushless direct current servo holder and a vehicle-mounted FSO terminal, and the high-speed buffer device is respectively connected with the vehicle-mounted brushless direct current servo holder, the vehicle-mounted FSO terminal and the data source through Ethernet; the server platform and the ground brushless direct current servo cradle head are connected through a CAN bus to form a closed-loop control system;
The ground equipment comprises a data storage NAS, a server platform, a ground brushless direct current servo cradle head and a ground FSO terminal, wherein the ground equipment is sequentially connected with the ground brushless direct current servo cradle head through an Ethernet and used for bearing service data, and the server platform is respectively connected with the ground brushless direct current servo cradle head, the data storage NAS and the ground FSO terminal through the Ethernet;
the cache device downloads data from the data source and stores the downloaded data into a hard disk of the cache device; the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured position information of the ground FSO terminal, and sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network;
after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the ground brushless direct current servo cradle head receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus, and adjusts the pointing direction of the ground FSO terminal;
after the server platform obtains the position information of the ground brushless direct current servo cradle head through the CAN bus, the server platform sends an instruction to the ground brushless direct current servo cradle head to finely adjust the pointing direction of the ground FSO terminal;
The vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, then the cache device sends registration information to the server platform for registration, and after the registration is passed, the cache device starts to transmit data to the server platform.
In one embodiment, the cache device downloads data from a data source and stores the downloaded data to a hard disk of the cache device; the method specifically refers to that downloaded data is stored in a hard disk of a cache device for buffering, the data source generates operation data by different types of vehicle-mounted equipment installed on a train, and the data source comprises: 6A video data, 6A driving safety data, 3C data and comprehensive detection data;
the downloading mode comprises an ftp file transfer protocol client program, an sftp secure file transfer protocol client program, a scp secure remote file copy and an rsync remote synchronous downloading mode.
In one embodiment, the cache device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured ground FSO terminal position information, and sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network, specifically, when the cache device detects that the position of the vehicle stop station is within the preset distance threshold range from the ground FSO terminal before sending the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network, the cache device sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network; meanwhile, the high-speed buffer device sends out an instruction to start power supply to the vehicle-mounted FSO terminal;
The position information of the vehicle-mounted FSO terminal is obtained through a Beidou differential module configured by a high-speed buffer device or obtained through a wireless beacon mode;
the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured ground FSO terminal position information, specifically, the high-speed buffer device calculates the offset angle of the vehicle-mounted FSO terminal according to the configured ground FSO terminal position information, and adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head;
the method comprises the steps of calculating the offset angle of a vehicle-mounted FSO terminal relative to a ground FSO terminal, and obtaining the offset angle of the vehicle-mounted FSO terminal by a method of calculating an azimuth angle, wherein the offset angle of the vehicle-mounted FSO terminal is as follows:
a = arctan(|dy/dx|)；
the coordinate increment dx=x '-x and the coordinate increment dy=y' -y are two-point coordinate components of the coordinates A (x, y) of the vehicle-mounted FSO terminal equipment and the coordinates B_1 (x ', y') of the ground FSO terminal equipment subtracted.
In one embodiment, after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the method specifically comprises the steps that after receiving position information of a vehicle-mounted FSO terminal, a server platform calculates an offset angle of the ground FSO terminal, the server platform starts power supply for the ground FSO terminal through an instruction, sends the offset angle of the ground FSO terminal to a ground brushless direct current servo holder, and the ground brushless direct current servo holder adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor;
After receiving the position information of the vehicle-mounted FSO terminal, the server platform calculates the offset angle of the ground FSO terminal, and obtains the offset angle of the ground FSO terminal by adopting a method for calculating an azimuth angle, wherein the offset angle of the ground FSO terminal is the offset angle of the ground FSO terminal relative to the vehicle-mounted FSO terminal;
defining the coordinates of the ground FSO terminal equipment as A (x, y) and the coordinates of the vehicle-mounted FSO terminal equipment as B_1 (x ', y'), and calculating the subtraction of two-point coordinate components to obtain a coordinate increment dx=x '-x, dy=y' -y;
if the coordinate increment dx, the coordinate increment dy is not zero; then the quadrant angle a=arctan (|dy/dx|) is calculated in degrees;
when the coordinate increment dx >0, the coordinate increment dy >0, azimuth = a;
azimuth = 180 ° -a when coordinate increment dx <0, coordinate increment dy > 0;
azimuth = 180 ° + a when the coordinate increment dx <0, the coordinate increment dy < 0;
azimuth = 360 ° -a when coordinate increment dx >0, coordinate increment dy < 0;
the ground brushless direct current servo cradle head receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus and adjusts the pointing direction of the ground FSO terminal, and specifically, the ground brushless direct current servo cradle head adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor; when the deviation angle a of the ground FSO terminal is less than or equal to 1 degree, further fine tuning is performed.
In one embodiment, when the deviation angle a of the ground FSO terminal is smaller than or equal to 1 degree, further fine tuning is performed, specifically, the server platform obtains the position information of the ground brushless direct current servo holder through the CAN bus, and sends an instruction to the ground brushless direct current servo holder to fine tune the pointing direction of the ground FSO terminal through the CAN bus again; the fine tuning is realized by connecting a server platform and a ground brushless direct current servo holder through a CAN bus to form a closed-loop control system, repeatedly acquiring position information through the server platform and the ground brushless servo holder, repeatedly adjusting an offset angle, and finishing fine tuning of the pointing direction of a ground FSO terminal relative to a vehicle-mounted FSO terminal when the final offset angle a is smaller than 0.01 DEG, wherein the vehicle-mounted FSO terminal and the ground FSO terminal finish tracking and focusing through respective self-contained laser shafts; the position information of the fine adjustment of the ground brushless direct current servo cradle head comprises position precision and angle adjustment precision.
In one embodiment, the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, and the system further comprises a high-speed buffer device which sends an automatic tracking starting instruction to the vehicle-mounted FSO terminal through the Ethernet, meanwhile, a server platform sends the automatic tracking starting instruction to the ground FSO terminal through the Ethernet, and the vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing processes by calculating the maximum light input point and adjusting the offset angle of the laser axis of the vehicle-mounted FSO terminal and the laser axis of the ground FSO ground terminal;
The vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing by calculating the maximum light input point and adjusting the offset angle of the laser axis of the vehicle-mounted FSO terminal and the laser axis of the ground FSO ground terminal, specifically, the vehicle-mounted FSO terminal receives the laser signal of the ground FSO terminal, meanwhile, the ground FSO terminal receives the laser signal of the vehicle-mounted FSO terminal, the vehicle-mounted FSO terminal equipment and the ground FSO terminal equipment respectively obtain the received light power, and after the vehicle-mounted FSO terminal and the ground FSO terminal receive the light power of the opposite end, the maximum light input point respectively obtained by the vehicle-mounted FSO terminal and the ground FSO terminal is calculated, and when the vehicle-mounted FSO terminal and the ground FSO terminal obtain the maximum light input point, the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing;
the maximum optical input point is obtained when the error rate is smaller than 1E-12; error rate = number of errors in transmission/total number of codes transmitted 100%;
after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device starts to transmit data to the server platform after passing registration.
In one embodiment, after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device starts to transmit data to the server platform after registering, specifically, when the cache device applies for registering to the server platform after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device reports the running state information of the cache device to the server platform; after the registration is passed, the cache device starts an lftp file client program or an ftp file transfer protocol client program to start data transmission to a server platform; the running state information of the high-speed buffer device comprises the power-on time, the power-off time and the disk occupancy rate of the vehicle-mounted equipment.
In one embodiment, the registration is performed by starting the lftp file client program or the ftp file transfer protocol client program to start transmitting data to the server platform through the post-cache device, and the method further comprises the steps that if the n-1 data is not transmitted, the cache device continues to transmit the breakpoint until the data transmission to the server platform is completed, and the cache device starts the n-th data transmission to the server platform.
In one embodiment, the cache device starts the nth data transmission to the server platform, that is, after the server platform receives the data, the data is directly stored in the data storage NAS, and whether a data file to be transmitted exists or not is judged according to the data transmission progress information reported by the cache device; the data transmission progress information comprises the file size of the nth data transmission, the number and the size of the remaining files to be transmitted;
after the data transmission is completed, the high-speed buffer device turns off the power supply of the vehicle-mounted equipment through an instruction, and the vehicle-mounted FSO terminal is turned off; the server platform turns off the power supply of the ground equipment by the instruction, and the ground FSO terminal is turned off; the lftp file client program or the ftp file transfer protocol client program is disconnected.
In one embodiment, the high-speed buffer device comprises a data storage buffer module, a data processing module, a Beidou differential positioning module and an interface module;
The data storage buffer module is used for storing data with the reading speed of more than 1500 MB/s;
the data processing module is used for carrying out calculation processing on the data based on the edge computer with calculation capability;
the Beidou differential positioning module is used for acquiring accurate position information of the vehicle-mounted FSO terminal;
the interface module is used for at least more than one tera-network port and n giga-network ports of the output port of the cache device, and dumping the collected running data of the vehicle-mounted equipment to the server platform through the lftp client program or the ftp file transmission protocol client program.
The embodiment of the invention provides a system for carrying out data dump of a train ground by using wireless optical communication, which solves the problems that the running time of a rail transit vehicle is long, the parking time is short, a large amount of data is generated by vehicle-mounted equipment during the running period of a train, the data to be dumped exceeds 1TB, the duration of the dumping process is too long, and the operation flow of the train is seriously influenced; according to the real technical scheme, a wireless optical communication technical scheme is used for data dump, the 4G network or a wireless beacon is combined with a WIFI network to exchange the position information of the vehicle-mounted FSO terminal and the position information of the ground FSO terminal, and the FSO terminal is assisted to automatically focus; the high-speed buffer device is adopted to send registration information to the server platform for registration, and the running state information of the high-speed buffer device is reported to realize data transmission; the data dump rate is more than 10 times of the data dump rate of the WIFI scheme and the 5G millisecond wave scheme, so that the data can be dumped to the ground data center in time in limited parking time of the train, the running data of the train can be analyzed in time, accidents are prevented, and the quick landing efficiency of a large amount of data is improved.
Example two
The embodiment of the invention provides a system for carrying out data dump of a vehicle ground by using wireless optical communication, which consists of two parts of vehicle-mounted equipment and ground equipment, wherein the system is in a block diagram as shown in fig. 1:
vehicle-mounted device configuration: a tera Ethernet connection, a vehicle-mounted FSO terminal and a brushless direct current servo cradle head (with a driving encoder) are used between a data source and a high-speed buffer device;
the high-speed buffer device is a solid state disk with a disk read speed of more than 1500MB/s and an M.2 (NVME protocol) interface, and is connected with the vehicle-mounted FSO terminal equipment through a tera-network port, and the embodiment uses a power supply system POE; human eye safety rating: 1 meter.
The high-speed buffer device is configured with a Beidou differential positioning module, the data quantity to be transmitted in the high-speed buffer device is larger than a preset threshold value, and the preset threshold value is correspondingly set according to the actual receiving capacity condition of the ground station and can be set as follows: 20 GBytes, 50GBytes, 100GBytes, etc. When the data quantity to be transmitted is larger than a preset threshold value, the data is transmitted once, otherwise, the frequent small-quantity data transmission affects the performance and the dump of the vehicle-mounted data of other vehicles.
The high-speed buffer device comprises a data storage buffer module, a data processing module, a Beidou differential positioning module and an interface module;
The data storage buffer module is used for storing data with the reading speed of more than 1500 MB/s;
the data processing module is used for performing calculation processing on the data based on the edge computer with calculation capability;
the Beidou differential positioning module is used for acquiring accurate position information of the vehicle-mounted FSO terminal;
the interface module is used for at least one more than one tera-network port and n giga-network ports of the output port of the cache device, and dumping the collected running data of the vehicle-mounted equipment to the server platform through an lftp client program or an ftp file transfer protocol client program.
Ground equipment configuration: the ground FSO terminal, the server platform, the brushless direct current servo cloud deck and the data storage NAS are connected by using a tera Ethernet;
in the embodiment, the FSO terminal is powered by POE; human eye safety rating: 1 meter; the LC-LC multimode fiber is converged in the switch and connected to the server platform, and the server platform uses the NAS device of the RAID 5 disk array for data storage, and the write rate of the disk array is selected to be more than 1500MB/s in the embodiment.
The FSO terminal equipment supports SNMP simple gateway management protocol, and can effectively manage the running state of the equipment; the system specifically operates as shown in the system flow chart of fig. 2.
1. Cache devices collect data from a data source
During operation of the vehicle, the cache device collects data from the data source through an ftp file transfer protocol client (or an sftp secure file transfer protocol client, a scp secure remote file copy tool, an rsync remote synchronization tool, etc.).
2. Hard disk for storing collected data in cache device
The cache device downloads data from a data source and stores the downloaded data to a hard disk of the cache device for buffering.
3. The high-speed buffer device sends the position information of the on-board FSO terminal to the server platform
In one embodiment, when the vehicle parking position is within a preset distance threshold range from the ground FSO terminal, the position information of the vehicle-mounted FSO terminal is sent to the server platform through a 4G network or a WIFI network; in an embodiment, when the preset value of the vehicle parking position from the ground FSO terminal is within 200 meters, the cache device sends the position information of the vehicle FSO terminal to the server platform through the 4G network or the WIFI network.
4. The high-speed buffer device opens POE power supply, the vehicle-mounted FSO terminal is electrified, and the vehicle-mounted FSO terminal enters an operation state
The high-speed buffer device enables POE power supply (namely, a POE power supply switch is turned on) through an internal instruction, the vehicle-mounted FSO terminal is electrified, and after self-checking, the high-speed buffer device enters an operation state (note: the vehicle-mounted FSO terminal uses a POE power supply mode, POE is Power overEthernet, ethernet power supply, more popular is power supply through a network port).
5. The high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured position information of the ground FSO terminal;
the server platform is connected with the ground brushless direct current servo cradle head through a CAN bus, and in the embodiment, for example: the ground brushless direct current servo cradle head belt driving encoder is internally provided with a position sensor, can perform position closed-loop control, has position feedback precision of 13bit and has angle adjustment precision of 0.01 degree; the server platform sends an offset angle which is zero degrees relative to the north direction to the ground brushless direct current servo cradle head through the CAN bus, and the pointing direction of the ground FSO terminal is adjusted through the ground brushless direct current servo cradle head.
The method for calculating the azimuth angle comprises the steps of respectively calculating relative azimuth angles according to two-point Beidou system (or GPS) coordinates of ground FSO terminal equipment and vehicle-mounted FSO terminal equipment: as shown in fig. 4, for example, the GPS coordinates of the terrestrial FSO terminal are in one of four quadrants; calculating the position of the vehicle-mounted FSO terminal relative to the ground FSO terminal based on the view angle of the vehicle-mounted FSO terminal equipment;
firstly, calculating coordinate increment dx=x '-x, dy=y' -y, and subtracting two point coordinate components corresponding to a ground FSO terminal equipment coordinate A (x, y) and a vehicle FSO terminal equipment coordinate B_1 (x ', y'), namely subtracting a point coordinate from an end point coordinate:
If one of dx and dy is zero, determining the azimuth angle according to the positive and negative of the other is: 0 °,90 °,180 °,270 °;
if dx, dy is not zero; then the quadrant angle a=arctan (|dy/dx|), unit: a degree;
obtaining an offset angle of the vehicle-mounted FSO terminal by a method of calculating an azimuth angle, wherein the offset angle of the vehicle-mounted FSO terminal is as follows:
when the coordinate increment dx >0, the coordinate increment dy >0, azimuth = a;
azimuth = 180 ° -a when coordinate increment dx <0, coordinate increment dy > 0;
azimuth = 180 ° + a when the coordinate increment dx <0, the coordinate increment dy < 0;
azimuth = 360 ° -a when coordinate increment dx >0, coordinate increment dy < 0;
6. after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; as shown in fig. 3, based on the view angle of the ground FSO terminal device, calculating the position of the ground FSO terminal relative to the vehicle-mounted FSO terminal; similarly, the azimuth (i.e. offset angle) adjusted by the ground FSO terminal is calculated according to the method for calculating azimuth in step 4 described above.
After the ground brushless direct current servo holder adjusts the pointing direction of the ground FSO terminal into place according to the offset angle of the ground FSO terminal through a self-configured servo motor, the server platform acquires the information of the built-in position sensor of the ground brushless direct current servo holder through a CAN bus, and sends an instruction to finely adjust the pointing direction of the ground FSO terminal through the CAN bus; the fine-tuning angle is smaller than a is smaller than or equal to 1 DEG, and the fine-tuning angle adjustment accuracy is generally 0.01 deg.
7. Vehicle-mounted FSO terminal and ground FSO terminal automatic focusing
The automatic focusing complete automatic focusing process of the vehicle-mounted FSO terminal and the ground FSO terminal is as follows:
the high-speed buffer device sends an automatic tracking start instruction to the vehicle-mounted FSO terminal through the Ethernet, meanwhile, the server platform sends the automatic tracking start instruction to the ground FSO terminal through the Ethernet, and the vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing processes by calculating the maximum light input point and properly adjusting the laser axis.
The vehicle-mounted FSO terminal and the ground FSO terminal calculate the maximum optical input point according to the bit error rate (bit error rate: less than 1E-12) and the received optical power of the opposite side. The larger the received optical power is, the smaller the bit error rate is, and the bit error rate is smaller than 1E-12, so that the maximum optical input point is obtained.
8. The cache device is connected to the server platform
After the tracking and focusing process is automatically completed, the cache device is connected to the server platform and is ready for data transmission.
9. Registering and reporting cache operating state information
The high-speed buffer device sends registration information to the server platform for registration, and reports the running state information of the high-speed buffer device, including power-on and power-off time, disk occupancy rate and the like.
10. The cache device initiates a client program process to begin data transfer
The caching device initiates an lftp file client program, or an ftp file transfer protocol client program, to begin data transfer. If the data which is not transmitted last time is available, breakpoint continuous transmission is carried out until transmission is completed, and new data transmission is started.
11. High-speed buffer device reporting transmission progress information
The reported transmission progress information comprises the size of the file currently being transmitted, the number of the remaining files to be transmitted and the size.
12. After receiving the data, the server platform directly stores the data into the data storage NAS.
13. The data transmission is completed to disconnect and shut down the vehicle equipment and the ground equipment.
The lftp file client program or the ftp file transfer protocol client program disconnects.
At the moment, the vehicle-mounted high-speed buffer device is powered off by POE, the vehicle-mounted FSO terminal is powered off, the server platform is powered off by POE, and the ground FSO terminal is powered off.
The embodiment of the invention provides a system for carrying out data dump of a train ground by using wireless optical communication, which solves the problems that the running time of a rail transit vehicle is long, the parking time is short, a large amount of data is generated by vehicle-mounted equipment during the running period of a train, the data to be dumped exceeds 1TB, the duration of the dumping process is too long, and the operation flow of the train is seriously influenced; according to the technical scheme, a wireless optical communication technical scheme is used for data dump, and the 4G network or the wireless beacon is combined with the WIFI network to exchange the position information of the vehicle-mounted FSO terminal and the position information of the ground FSO terminal so as to assist the FSO terminal to automatically focus; the high-speed buffer device is adopted to send registration information to the server platform for registration, and the running state information of the high-speed buffer device is reported to realize data transmission; the data dump rate is more than 10 times of the data dump rate of the WIFI scheme and the 5G millisecond wave scheme, so that the data can be dumped to the ground data center in time in limited parking time of the train, the running data of the train can be analyzed in time, accidents are prevented, and the quick landing efficiency of a large amount of data is improved.
Claims (8)
1. The system for carrying out ground data dump by using wireless optical communication is characterized by comprising vehicle equipment and ground equipment, wherein the vehicle equipment comprises a data source, a high-speed buffer device, a vehicle-mounted brushless direct current servo holder and a vehicle-mounted FSO terminal, and the high-speed buffer device is respectively connected with the vehicle-mounted brushless direct current servo holder, the vehicle-mounted FSO terminal and the data source through Ethernet;
the ground equipment comprises a data storage NAS, a server platform, a ground brushless direct current servo holder and a ground FSO terminal, wherein the server platform is respectively connected with the ground brushless direct current servo holder, the data storage NAS and the ground FSO terminal through an Ethernet; the server platform and the ground brushless direct current servo cradle head are connected through a CAN bus to form a closed-loop control system;
the high-speed buffer device downloads data from a data source and stores the downloaded data into a hard disk of the high-speed buffer device; the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured position information of the ground FSO terminal, and sends the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network;
After receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the ground brushless direct current servo cradle head receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus, and adjusts the pointing direction of the ground FSO terminal;
after the server platform obtains the position information of the ground brushless direct current servo holder through the CAN bus, the server platform sends an instruction to the ground brushless direct current servo holder to finely adjust the pointing direction of the ground FSO terminal;
the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, then the cache device sends registration information to the server platform for registration, and after the registration is passed, the cache device starts to transmit data to the server platform;
after receiving the position information of the vehicle-mounted FSO terminal, the server platform adjusts the pointing direction of the ground FSO terminal through the ground brushless direct current servo cradle head; the method specifically comprises the steps that after receiving position information of a vehicle-mounted FSO terminal, a server platform calculates an offset angle of the ground FSO terminal, the server platform starts power supply for the ground FSO terminal through an instruction, sends the offset angle of the ground FSO terminal to a ground brushless direct current servo holder, and the ground brushless direct current servo holder adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor;
The method comprises the steps that after receiving position information of a vehicle-mounted FSO terminal, the server platform calculates an offset angle of the ground FSO terminal, and an azimuth angle calculating method is adopted to obtain the offset angle of the ground FSO terminal, wherein the offset angle of the ground FSO terminal is the offset angle of the ground FSO terminal relative to the vehicle-mounted FSO terminal;
defining the coordinates of the ground FSO terminal equipment as A (x, y) and the coordinates of the vehicle-mounted FSO terminal equipment as B_1 (x ', y'), and calculating the subtraction of two-point coordinate components to obtain a coordinate increment dx=x '-x, dy=y' -y;
if the coordinate increment dx, the coordinate increment dy is not zero; then the quadrant angle a=arctan (|dy/dx|) is calculated in degrees;
when the coordinate increment dx >0, the coordinate increment dy >0, azimuth = a;
azimuth = 180 ° -a when coordinate increment dx <0, coordinate increment dy > 0;
azimuth = 180 ° + a when the coordinate increment dx <0, the coordinate increment dy < 0;
azimuth = 360 ° -a when coordinate increment dx >0, coordinate increment dy < 0;
the ground brushless direct current servo holder receives offset angle information of a ground FSO terminal sent by a server platform through a CAN bus, and adjusts the pointing direction of the ground FSO terminal; the ground brushless direct current servo cradle head adjusts the pointing direction of the ground FSO terminal according to the offset angle of the ground FSO terminal through a self-configured servo motor; when the deviation angle a of the ground FSO terminal is less than or equal to 1 DEG, further fine tuning is performed;
When the deviation angle a of the ground FSO terminal is less than or equal to 1 DEG, further fine tuning is performed; the method specifically comprises the steps that a server platform obtains position information of a ground brushless direct current servo holder through a CAN bus, and sends an instruction to the ground brushless direct current servo holder through the CAN bus again to finely adjust the pointing direction of a ground FSO terminal; the fine tuning is realized by connecting a server platform and a ground brushless direct current servo holder through a CAN bus to form a closed-loop control system, repeatedly acquiring position information through the server platform and the ground brushless servo holder, repeatedly adjusting an offset angle, and finishing fine tuning of the pointing direction of a ground FSO terminal relative to a vehicle-mounted FSO terminal when the final offset angle a is smaller than 0.01 DEG, wherein the vehicle-mounted FSO terminal and the ground FSO terminal finish tracking and focusing through respective self-contained laser shafts; the position information of the fine adjustment of the ground brushless direct current servo cradle head comprises position precision and angle adjustment precision.
2. A system for data dumping on a vehicle using wireless optical communication as claimed in claim 1, wherein said cache means downloads data from a data source and stores said downloaded data in a hard disk of the cache means; the method specifically refers to that downloaded data is stored in a hard disk of a cache device for buffering, a data source generates operation data by different types of vehicle-mounted equipment installed on a train, and the data source comprises: 6A video data, 6A driving safety data, 3C data and comprehensive detection data;
The downloading mode comprises an ftp file transfer protocol client program, an sftp secure file transfer protocol client program, a scp secure remote file copy and an rsync remote synchronous downloading mode.
3. The system for performing ground data dump by using wireless optical communication according to claim 1, wherein the cache device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured ground FSO terminal position information, and transmits the position information of the vehicle-mounted FSO terminal to the server platform through the wireless communication network; specifically, when the cache device detects that the position of the stop of the vehicle is within a preset distance threshold range from the ground FSO terminal, the position information of the vehicle-mounted FSO terminal is sent to the server platform through the wireless communication network, and meanwhile the cache device sends out an instruction to start power supply to the vehicle-mounted FSO terminal;
the position information of the vehicle-mounted FSO terminal is obtained through a Beidou differential module configured by a high-speed buffer device or obtained through a wireless beacon mode;
the high-speed buffer device adjusts the pointing direction of the vehicle-mounted FSO terminal through the vehicle-mounted brushless direct current servo cradle head according to the configured position information of the ground FSO terminal; the method specifically comprises the steps that a high-speed buffer device calculates an offset angle of a vehicle-mounted FSO terminal according to position information of the configured ground FSO terminal, and the pointing direction of the vehicle-mounted FSO terminal is adjusted through a vehicle-mounted brushless direct current servo cradle head;
The offset angle of the vehicle-mounted FSO terminal relative to the ground FSO terminal is calculated, the offset angle of the vehicle-mounted FSO terminal is obtained through a method of calculating an azimuth angle, and the offset angle of the vehicle-mounted FSO terminal is as follows:
a = arctan(|dy/dx|)；
the coordinate increment dx=x '-x and the coordinate increment dy=y' -y are two-point coordinate components of the coordinates A (x, y) of the vehicle-mounted FSO terminal equipment and the coordinates B_1 (x ', y') of the ground FSO terminal equipment subtracted.
4. The system for performing data dumping on a vehicle ground by using wireless optical communication according to claim 1, wherein the vehicle-mounted FSO terminal and the ground FSO terminal complete tracking and focusing through respective self-contained laser shafts, the system further comprises a high-speed buffer device which sends an automatic tracking start command to the vehicle-mounted FSO terminal through an Ethernet, meanwhile, the server platform sends an automatic tracking start command to the ground FSO terminal through the Ethernet, and the vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing processes by calculating a maximum optical input point and adjusting the offset angles of the laser shafts of the vehicle-mounted FSO terminal and the ground FSO terminal;
the vehicle-mounted FSO terminal and the ground FSO ground terminal automatically complete tracking and focusing by calculating the maximum light input point and adjusting the offset angle of the laser axis of the vehicle-mounted FSO terminal and the laser axis of the ground FSO ground terminal; the method specifically refers to that a vehicle-mounted FSO terminal receives a laser signal of a ground FSO terminal, and simultaneously, the ground FSO terminal receives the laser signal of the vehicle-mounted FSO terminal, the vehicle-mounted FSO terminal and the ground FSO terminal calculate to obtain received light power respectively, and after receiving the light power of an opposite terminal according to the size of an error rate, the vehicle-mounted FSO terminal and the ground FSO terminal calculate the maximum light input point obtained respectively, and when the vehicle-mounted FSO terminal and the ground FSO terminal obtain the maximum light input point, the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing;
The maximum optical input point is obtained when the error rate is smaller than 1E-12; the bit error rate = number of errors in transmission/total number of codes transmitted 100%;
after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache device starts to transmit data to the server platform after registering with the server platform.
5. The system for data dumping of a vehicle using wireless optical communication as set forth in claim 4, wherein after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, the cache means starts to transmit data to the server platform after registering with the server platform; the method specifically refers to that after the vehicle-mounted FSO terminal and the ground FSO terminal automatically complete tracking and focusing, when the cache device applies for registration to the server platform, the running state information of the cache device is reported to the server platform; the post-cache device starts an lftp file client program or an ftp file transfer protocol client program to start data transmission to the server platform after registration; the operation state information of the high-speed buffer device comprises the power-on time, the power-off time and the disk occupancy rate of the vehicle-mounted equipment.
6. The system for data dumping on a vehicle using wireless optical communication of claim 5, wherein the registering starts the data transfer to the server platform by starting the lftp file client program or the ftp file transfer protocol client program by the post-caching device, and further comprising the caching device continuing the breakpoint transfer if there is an n-1 th data transfer not completed until the data transfer to the server platform is completed, and the caching device starting the n-th data transfer to the server platform.
7. The system for data dumping of a vehicle floor by using wireless optical communication according to claim 6, wherein the step of starting the transmission of the nth data to the server platform by the cache device means that the server platform directly stores the nth data into the data storage NAS after receiving the nth data, and judges whether a data file to be transmitted exists or not according to the data transmission progress information reported by the cache device; the data transmission progress information comprises the file size of the nth data transmission, the number and the size of the remaining files to be transmitted;
after the data transmission is completed, the high-speed buffer device turns off the power supply of the vehicle-mounted equipment through an instruction, and the vehicle-mounted FSO terminal is turned off; the server platform turns off the power supply of the ground equipment by the instruction, and the ground FSO terminal is turned off; the lftp file client program or the ftp file transfer protocol client program disconnects.
8. The system for performing data dump of a vehicle using wireless optical communication according to claim 7, wherein the cache device comprises a data storage buffer module, a data processing module, a Beidou differential positioning module and an interface module;
the data storage buffer module is used for storing data with the reading speed of more than 1500 MB/s;
the data processing module is used for performing calculation processing on the data based on the edge computer with calculation capability;
the Beidou differential positioning module is used for acquiring accurate position information of the vehicle-mounted FSO terminal;
the interface module is used for at least one more than one tera-network port and n giga-network ports of the output port of the cache device, and dumping the collected running data of the vehicle-mounted equipment to the server platform through an lftp client program or an ftp file transfer protocol client program.
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