[GPS positioner] How to prevent the installation of the GPS positioner prevent the car GPS locator from being demolished by the thief by the thief

The GPS positioner is currently widely used and very common. In the automotive industry, it is an indispensable anti -theft positioning equipment. It plays an important role in vehicle management and vehicle anti -theft.The GPS positioner is a very advanced risk control device in some industries, but in specific industries, there is no secret at all. It is inevitable that how to prevent the demolition of the GPS positioner is a problem that the specific industry practitioners have to consider.Essence

So how to prevent the GPS locator from being demolished?What are the effective ways to prevent the GPS positioner from being demolished?

1. The anti -demolition GPS positioner can be selected. When the equipment is human destructive, it will increase the difficulty of demolition.

2. Use a GPS locator with a spare power supply. When the external power supply is damaged, it can still be located in a short time and issue alarm information.

3. installation is as hidden as possible.Installing the device in the place where it is not easy to be discovered in the car.

4. After removal, you can use the track playback function to find the activities of people or vehicles.

5. In the case of conditions permit, you can install two GPS locors. After the thief is removed, the thief is taken lightly, and often does not find another one.

The GPS positioner is the terminal of the GPS module and the mobile communication module. It is used to transmit the positioning data obtained by the GPS module through the mobile communication module (GSM/GPRS network) to a server on the Internet, which can be realized on the computerQuery terminal position.

installation method

The external power supply GPS positioner must connect to the car power supply before it can work for 24 hours. Generally, it is impossible to use this product to track other people's vehicles.Because it is necessary to access it with the car power supply, the difference is generally a plug -in locator.Therefore, it is not recommended to use a plug -in power supply.

installation path

1. If you understand the electricity, you can install it yourself. In fact, as long as you find the positive and negative electrodes of the car power supply, the negative electrode is very easy to find.Go to the battery;

2. It is best to connect to ordinary electricity, which is not affected by the car key switch. The power cord directly attracted from the car battery;

3. Note that the GPS positioner has a light side to the sky. Do not keep the metal object on this side of the sky to block the internal GPS antenna. It also receives a satellite signal of 20,000 kilometers away;

4. You can also ask the relevant technical personnel to install it, and the charges depending on the specific local situation!

installation location

1. The front windshield above the windshield;

2. The hidden part of the decorative board below the front windshield;

3. The hidden part of the front instrument panel;

4. In the door partition;

5. The decorative board below the windshield;

6. In the front bumper, pay attention to waterproof;

7. Under the wiper board, pay attention to waterproof.

Note: If the windshield is pasted with a metal insulation layer or heating layer, the GPS receiving signal will be reduced, causing GPS to work abnormal.At this time, pay attention to replace the equipment installation location.

installation point

1. In order to avoid the destruction of the thief, the equipment selection should be as conceived as much as possible;

2. Avoid putting with the launch source, such as wireless reversing radar, anti -theft, and other vehicle communication equipment;

3. You can use tie -tie fixing, or use wide beach cotton to stickers with double sides;

4. There are GSM antennas and GPS antennas in the device. When installation, it should be guaranteed to be upward (towards the sky).

one,What is GPS vehicle management system

The GPS Vehicle Management System uses global positioning technology, transmits through wireless data, and cooperates with computer software (MIS) to realize the static and dynamic information of the vehicle.The biggest difference between it and previous GPS positioning equipment is the diversification and systematic management function, which highlights the management function of computer software rather than positioning equipment functions.Compared with ordinary vehicle management systems, its data dynamic has advantages.

2. The basic use of the GPS vehicle management system

Real -time positioning, vehicle monitoring and control, vehicle dispatch management, vehicle alarm disposal, vehicle logistics management, online vehicle check service, SMS voice communication, etc.The system is applicable to the use of cities, regions, and nationwide, and it is suitable for the use of government, groups, enterprises and institutions, and even private vehicle users.It can monitor the vehicle's illegal driving, improve the anti -theft ability of the vehicle, improve the efficiency of the vehicle's operating efficiency, increase the economic efficiency of the vehicle's operating, and promote the modernization, informationization, and intelligent construction of vehicles in my country.

three,GPS vehicle management systemFunction

1. Vehicle positioning

The system can realize that all vehicles are displayed on the same map at the same time. According to the location and quantity of the vehicle, the system automatically adjusts the map to the most appropriate scale, and the real -time position and state of all vehicles are clear at a glance.The vehicle's rapid flash indicates that the vehicle is Running, and the vehicle slowly indicates that the vehicle stops.

2. bicycle positioning amplification

When monitoring a single vehicle, the system describes the operating route of the vehicle on the map with continuous blue lines. The real -time state of the vehicle and the real -time location of the vehicle will be automatically refreshed once a minute to ensure that the latest data is uploaded to the system at any time.If the marked location on the electronic map is not detailed, it can be converted to the following satellite maps.

3. Vehicle satellite map

Through the satellite map, you can see the clear physical maps of the roads and buildings around the vehicle.

4. Precise electronic map

Use the latest, genuine, updated Mapabc maps to show the location and trajectory of the vehicle. The parking lots, gas stations, factories, and various highways around the vehicle have clear positioning on the electronic maps.

5. Vehicle driving trajectory

You can query the driving trajectory of a vehicle during any time. The map automatically describes the Running route of the vehicle in a continuous blue line. It is intuitive and clear, and can be exported to the Excel report.

The system can also automatically put back the vehicle Running trajectory in a dynamic form, allowing you to clearly and meticulously understand the historical operating status of the vehicle.

6. Driving mileage and fuel consumption

The system can output the car's driving time, parking time, driving mileage, and the fuel consumption corresponding to the mileage according to the set period.

7. Analysis of vehicle parking location

The system can output when the car is parking, where to Park, and how long is the parking.At the same time, it can be concluded that the car's mileage, driving fuel consumption, driving time, etc. during this period can be preserved in the exeCl format.

8. Vehicle driving report

In the report analysis function, more than a dozen practical reports such as parking reports, driving reports, speeding reports, and mileage reports can be generated according to the information recorded during the driving process, and the content of the report can be preserved in Execl format.

9. Check on a mobile phone

Users can log in to the system platform through the mobile phone to check the real -time situation of the vehicle. They can directly view the map in the mobile phone and perform the control function of the relevant vehicle. It is simple and practical.

10. Passion alarm

Freely set up fences, enter and exit fences, open doors in the fence, closing the door alarm, speed limit alarm in the fence, and monitor the rational use range and safety of the vehicle.

11. Information point labeling

You can mark the company's own outlets on the map, and the delivery of the target, toll stations, gas stations and other labels such as the delivery of the goods to facilitate the operation.The marking points will be displayed in "vehicle tracking" and "driving trajectory playback".Through the labeling of more outlets, you can determine the most effective transportation path, and you can clearly know whether the vehicle is Running in accordance with regulations.

12. SMS alarm

The emergency contact person can be set. When the vehicle encounters an emergency, the system can automatically send the alarm information to the contact person's mobile phone.

13. Extension function

Oil monitoring function, temperature monitoring function, etc.

In addition to the real -time positioning, historical trajectory reckles, cross -border alarm, and one -click alarm for help, the GPS vehicle management system has the management function:

(1) Automatically generate report statistics of the mileage and speed of the vehicle every month

With the GPS positioning function management system, the mileage and speed of each car can be automatically recorded in the case, and the statistical statement is automatically generated during the specified date of each month.Abnormal vehicles are analyzed and compared, and then through the historical trajectory function of the system, the problem can be easily found.

(2) Automatic comparison of oil volume

The system will calculate a reasonable fuel consumption based on the mileage and speed parameters, and compare the actual refueling volume to analyze the actual refueling volume, and provide a reward and punishment basis for the fuel -saving bald soldiers or fuel consumption.

(3) Automatic prompts for annual inspection, insurance, and maintenance due

When the system will automatically check the annual inspection, insurance, and maintenance, the SMS and system page prompts will be issued.

(4) Reminder of timely information information information

For cities that have established road conditions information points, such as Shanghai and Beijing, the system will indicate road traffic congestion in the form of colors, which is convenient for scheduling and management vehicles to choose a reasonable route to reduce fuel consumption.

(5) Inquiry of traffic violations and insurance claims

The system can directly log in to the traffic safety information network and insurance network to inquire about the illegal and insurance claim information of the vehicle to prevent the occurrence of "violations" or "claims".

(6) System backstage monitoring 24 -hour monitoring

Once the alarm for help occurs, the main control interface of the system will display the alarm information. The center duty staff can contact the client to confirm the police situation.

(7) U shield encryption

In order to improve security, in addition to the user name and password login, the system can also adopt the dual verification of user names, passwords, and U disk encryption keys for certification login.

Four,GPS vehicle management systemForeground

Motors are getting more and more into our lives, and the continuous reduction of fuel as non -renewable resources also plagues us.In addition to inventing new fuel -saving technologies and developing new energy vehicles, the scientific management of existing vehicles is more efficient and fast.The GPS vehicle management system not only makes up for the limitations of the traditional vehicle management system for dynamic data processing statistics, but also greatly improves the application and scalability of GPS positioning equipment, just like the launch vehicle of the nuclear warhead.Greatly improved.With the rapid development of computer technology and positioning technology, the GPS vehicle management system will surely become the mainstream of the vehicle management system.

1. How is the GPS positioning system positioning

The 24 GPS satellites run around the earth at a high altitude of 12,000 kilometers from the ground, so that at any moment at any time, any at all at the ground can be observed at the same time.

Because the position of the satellite is accurate, in the GPS observation, we can get the distance from the satellite to the receiver. Using the distance formula in the three -dimensional coordinates, the three satellites can be used to form three equations to solve the position of the observation point (x X, y, z).Considering the error between the clock of the satellite and the receiver clock, there are actually 4 unknown, X, Y, Z, and clock difference, so the 4th satellite needs to be introduced to form 4 squares to solve, so as to obtain the observation point of the observation pointLavels and heights.

In fact, the receiver can often lock more than 4 satellites. At this time, the receiver can be distributed into several groups according to the satellite constellation, and each group is 4, and then the group with the smallest error is selected by the algorithm for positioning, thereby positioning, so asImprove accuracy.

Due to the errors of satellite Running tracks and satellite clocks, the impact of atmosphere on the signal of the flow layer, the ionization layer on the signal, and the artificial SA protection policy, the positioning accuracy of the civil GPS is only 100 meters.In order to improve the positioning accuracy, the differential GPS (DGPS) technology is generally adopted to establish a reference station (differential table) for GPS observation. The accurate coordinates of the known benchmark station are used to compare the observation values to obtain a correction number and release it outside the outside world.EssenceAfter receiving the correction number, the receiver compares it with its own observation value, eliminates most of the errors, and obtains a more accurate position.Experiments show that the positioning accuracy can be increased to 5 meters by using differential GPS.

vehicle navigation system is mainly composed of navigation hosts and navigation display terminals.The built -in GPS antenna will receive at least 3 data information transmitted from 24 GPS satellites surrounding the earth, thereby determining the current location of the car.The navigation host is matched with the electronic map data determined by the GPS satellite signal to determine the accurate location of the car in the electronic map.

On this basis, various functions such as driving navigation, route recommendation, information query, and playback AV/TV will be realized.Drivers only need to watch the screens on the display and listen to voice prompts, and manipulate the remote control in the hand to achieve the above functions, so as to drive easily and freely.

Global Positioning System is the second -generation satellite navigation system in the United States.It was developed on the basis of the Ziwuyi satellite navigation system, and it adopted the successful experience of the Wuwuyi system.Like the Ziwuyi system, the global positioning system consists of three parts: space part, ground monitoring, and user receiving machines.

According to the current plan, the space part of the global positioning system uses 24 satellites with a height of about 20,200 kilometers to form a satellite constellation.21 3 satellites are near -circular orbit, and the operating cycle is about 11 hours and 58 minutes. It is distributed on the six orbit planes (four on the surface of the orbit), and the orbital inclination angle is 55 degrees.The distribution of satellites allows more than four satellites at any time around the world at any time, and can maintain a good positioning and solving geometric graphics (DOP).This provides continuous global navigation capabilities in time.

The ground monitoring section includes four monitoring stations, one upward injection station and a main control station.The monitoring station has a GPS user receiver, atomic clock, a sensor collected by local weather data, and a computer that processes preliminary data.The main task of the monitoring station is to obtain satellite observation data and send these data to the main control station.The main control station is located at the Vanden Fort Air Force Base.It implements comprehensive control of the ground monitoring department.The main task of the main control station is to collect all observation data of the GPS satellites in each monitoring station, and use these data to calculate the orbit and satellite clock of each GPS satellite.The upward injection station is also located at the Vanden Fort Air Force Base.Its task is mainly to inject such navigation data and the instructions of the main control station into the satellite when each satellite runs to the sky.This injection is performed once a day for each GPS satellite and the final injection before the satellite leaves.

The global positioning system has the characteristics of good performance, high accuracy, and wide application. It is by far the best navigation positioning system.With the continuous improvement of the global positioning system and the continuous improvement of software and software, the application fields are continuously developing. At present, the various departments of the national economy have begun to gradually penetrate people's daily life.

2. Positioning principle of GPS navigation

d1 = [(x1-x2)^2 (y1-y2)^2 (Z1-Z2)^2]^1/2 c (vt1-vt0)

d2 = [(x2-x)^2 (y2-y)^2 (Z2-Z)^2]^1/2 c (vt2-vt0)

d3 = [(x3-x)^2 (y3-y)^2 (Z3-Z)^2]^1/2 c (vt3-vt0)

d4 = [(x4-x)^2 (y4-y)^2 (Z4-Z)^2]^1/2 c (vt4-vt0)

In the above four equations, the coordinates of the measuring point X, Y, Z, and VTO are unknown parameters, where DI = C TI (i = 1, 2, 3, 4).

DI (i = 1, 2, 3, 4) is satellite 1. Satellite 2, satellite 3. Satellite 3. Satellite 3, satellite 4 to receiver.

TI (i = 1, 2, 3, 4) is satellite 1. Satellite 1. Satellite 2. Satellite 2, satellite 3, and satellite 4 signals to reach the time of the receiving machine.

C is the speed of transmission of GPS signal (ie, the speed of light).

The meaning of each parameter in the four equations is as follows:

X, Y, and Z is the spatial right -angle coordinates of the coordinates to be tested.

XI, Yi, Zi (i = 1, 2, 3, 4) are satellite 1. Satellite 1. Satellite 2. Satellite 2, Satellite 3, Satellite 4's spatial right -angle coordinates at the time of T, can be obtained by satellite navigation.

VT I (i = 1, 2, 3, 4) is satellite 1, satellite 2, satellite 3. Satellite 3, and satellite 4 satellite clocks, which are provided by the satellite star calendar.

VTO is the bell of the receiver.

From the above four equations, the clock vTO of the coordinates of X, Y, Z and the receiver at the above four equations.

The basic positioning principle of GPS is: satellite sends its own star parameters and time information uninterrupted. After receiving this information, the user receives the three -dimensional position, three -dimensional direction, and time information of the receiver.

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What are the categories of GPS navigator

Classification by the purpose of the receiver

1.navigation receiver

This type of receiver is mainly used for navigation of the motion carrier, which can give the position and speed of the carrier in real time.This type of receiver generally uses C/A code pseudo -distance measurement. The real -time positioning accuracy of the single point is low, generally 10m, and the SA affects 100m.This type of receiver is cheap and widely used.Depending on the application field, such receivers can be further divided into:

car type -for vehicle navigation positioning;

navigation type -for Ship navigation positioning;

Aviation type -for aircraft navigation positioning.

Due to the fast Running speed of the aircraft, the receiver used on aviation requires to adapt to high -speed exercise.

Starry type -for navigation positioning for satellites.Because the speed of satellites is as high as 7km/s, the requirements for receiving machines are higher.

2.Ground -type receiver

The ground -type receiver is mainly used for precision land measurement and precision engineering measurement.This type of instrument mainly uses carrier phase observation values for relative positioning, with high positioning accuracy.The structure of the instrument is complicated and the price is more expensive.

3.Time -type receiver

This type of receiver mainly uses the high -precision time standard provided by the GPS satellite to be awarded, and it is often used in the time of time in the observatory and radio communication.

Classified by the carrier frequency of the receiver

Single -frequency receiver

Single -frequency receiver can only receive the L1 carrier signal, and the carrier phase observation value can be determined.Because the effect of the ionization layer delay cannot be effectively eliminated, a single -frequency receiver is only applicable to the precision positioning of the short -based line (& lt; 15km).

Dual -frequency receiver

The dual -frequency receiver can receive L1 and L2 carrier signals at the same time.The use of dual -frequency delay on the ionization layer can eliminate the effects of ionizing layers on the delay of electromagnetic wave signals. Therefore, dual -frequency receiver can be used for precision positioning of thousands of kilometers long.

Classified by the number of channel channels

The GPS receiving function also receives the signals of multiple GPS satellites at the same time. In order to separate the signal of different satellites received to achieve the tracking, processing and measurement of satellite signals, devices with such functions are called antenna signal channels.The types of channels that the receiver can be divided into: multi -channel receiver; sequential channel receiver; multi -channel multi -purpose channel receiver.

Classified by the working principle of the receiver

Code -related receiver

Code -related receiver uses code -related technologies to obtain pseudo -distance observation values.

Square receiver

The Square receiver uses the Square technology of the carrier signal to remove the adjustment signal to restore the complete carrier signal. The phase difference between the carrier signal generated in the receiving machine through the phase meter is determined by the phase difference between the carrier signal generated in the receiverEssence

Hybrid receiver

This instrument is a comprehensive advantage of the above two receiving machines. It can obtain the code phase pseudo distance or the carrier phase observation value.

Interference receiver

This receiver uses the GPS satellite as a radio power source. The interference measurement method is used to determine the distance between the two measuring stations.

GPS navigator is classified according to use

1As well asnavigation receiver

This type of receiver is mainly used for navigation of the motion carrier, which can give the position and speed of the carrier in real time.This type of receiver is generally adoptedC/ACode pseudo -distance measurement, a single point of real -time positioning accuracy is low, generally10M,haveSAThe influence is100MEssenceThis type of receiver is cheap and widely used.Depending on the application field, such receivers can be further divided into:

car type -for vehicle navigation positioning;

navigation type -for Ship navigation positioning;

Aviation type -for aircraft navigation positioning.Due to the fast Running speed of the aircraft, the receiver used on aviation requires to adapt to high -speed exercise.

Starry type -for navigation positioning for satellites.Due to the high speed of satellites7km/sThe above, so the requirements for receiving machines are higher.

2. Destiny receiver machine

The ground -type receiver is mainly used for precision land measurement and precision engineering measurement.This type of instrument mainly uses carrier phase observation values for relative positioning, with high positioning accuracy.The structure of the instrument is complicated and the price is more expensive.

3. Time -type receiver

This type of receiver is mainly usedGPSThe high -precision time standard provided by satellites is often used in the time of time in the Observatory and radio communication.

Classified by the carrier frequency of the receiver

1. Single -frequency receiver

Single -frequency receiver can only receiveL1Carrier signal, determine the observation value of the carrier phase.Because the effect of the ionization layer cannot be effectively eliminated, the single -frequency receiver is only applicable to the short -based line (& lt; 15km) Precision positioning.

1. Dual -frequency receiver

Dual -frequency receiver can be received at the same timeL1,,L2Carrier signal.The use of dual -frequency delay on the ionization layer can eliminate the effects of ionizing layers on the delay of electromagnetic wave signals. Therefore, dual -frequency receiver can be used for precision positioning of thousands of kilometers long.

Classified by the number of channel channels

GPSReceive functions at the same timeGPSSatellite signals, in order to separate the signals of different satellites received to achieve the tracking, processing and measurement of satellite signals. Meters with such functions are called antenna signal channels.The types of channels that are received according to the receiver can be divided into:

Multi -channel receiver

Order channel receiver

Multi -way multi -use channel receiver

Classified by the working principle of the receiver

Code -related receiver

Code -related receiver uses code -related technologies to obtain pseudo -distance observation values.

Square receiver

The Square receiver uses the Square technology of the carrier signal to remove the adjustment signal,,To restore the complete carrier signal, the phase difference between the carrier signal generated in the receiving machine through the phase meter is determined to determine the pseudo -distance observation value.

Hybrid receiver

This instrument is a comprehensive advantage of the above two receiving machines. It can obtain the code phase pseudo distance or the carrier phase observation value.

Interference receiver

This kind of receiver isGPSAs a radio source, the satellite uses the interference measurement method to determine the distance between the two stations.

go through20The practice of the rest of the year proves,GPSThe system is a high -precision, all -weather and global radio navigation, positioning and timing multi -functional system.GPSTechnology has developed into an international high -tech industry with multi -field, multi -mode, multi -purpose, and multi -model.

MeasuringGPS

The ground -type receiver is mainly used for precision land measurement and precision engineering measurement.This type of instrument mainly uses carrier phase observation values for relative positioning, with high positioning accuracy.The structure of the instrument is complicated and the price is more expensive.According to the use of use and accuracy, it is also divided into static (single -frequency) receiver and dynamic (dual -frequency) receiver.RTKEssence

carGPS

When it is made through hardware and softwareGPSWhen the positioning terminal is used for vehicle positioning, it is called a carGPS,However, the positioning alone is not good, and this positioning information must be passed to the alarm center or on the carGPSWith the holder, we call it a third party.soGPSThe positioning system also containsGSMNetwork Communication (mobile phone communication), passGSMThe network sends satellite positioning information to a third party by SMS.Interpret SMS with a microcomputer and display the location of the vehicle on the electronic map.This realizes the carGPSposition.At the same time, install the corresponding detection sensor on the car, and use the carGPSPositioningGSMThe network communication function can also send the anti -theft alarm information to a third party, or send this alarm phone and SMS directly to the owner's mobile phone, complete the car to complete the carGPSanti -theft alarm.It can be seen here that the carGPSPositioningGSMThe network part is actually a smartphone that can communicate with third parties. You can also seize the vehicle by the driver, and the driver is sent to the third party.So the carGPSPositioning is positioning, anti -theft, and anti -robbery.

Similar carGPS

Similar carGPSTerminals include positioning mobile phones, personal positioners, etc.GPSSatellite positioning is due to the third -party positioning service, so it is necessary/ /Annual service fee.

All currentGPSThere is no navigation function for positioning the terminal.Because the hardware and software need to be increased, the cost is increased.

GPSEarly warning device

GPSThe early warning device is passedGPSSatelliteGPSSet the coordinates in the early warning device to complete, such as encountering an electronic eye, and then set up a coordinate directly below the electronic eye through the relevant device.Before300Early warning will start around Mi, telling the owner that there is an electronic eye test in front of the owner, and it cannot be drove over speed, which plays a warning role.Such accuracy is related to the amount of data points, mainly to achieve the use of satellite positioning.

Use your mobile phone number to locate how to find someone

1. Positioning based on GPS

Use the GPS positioning module on the mobile phone to send your position signal to the positioning background to achieve the positioning of the mobile phone. The positioning accuracy is high, and the method of positioning the WIFI in a small range.

2. Positioning of the base station based on the mobile operation network

The base station positioning uses the calculation distance of the base station's distance to determine the location of the mobile phone. This method does not require the mobile phone to have the GPS positioning ability, but it depends on the distribution and coverage of the base station. Sometimes the error will exceed 200 meters. ThereforeIn terms of accuracy, it is not as good as GPS positioning.

When you need a friend or family you need to care about the accident, where can you pass? The mobile phone number quickly determines that the opponent's general position can be found.You can also manage the employee's foreign service route and pay attention to the employee's foreign service attendance through the mobile phone number. For the logistics team, you can also investigate the general location of the vehicle cargo through the mobile phone number.

mobile phone number positioning principle

The mobile phone positioning system refers to the location information of mobile phones or end users through specific positioning technology(Latitude coordinates., Sign the technology or service of the position of the positioning object on the electronic map.

There are two types of mobile phone positioning technology, one is based onGPSThe positioning of the positioning is based on the base station of the mobile operation network.based onGPSThe positioning method is to use the mobile phoneGPSThe positioning module sends its own location signal to the positioning background to achieve mobile phone positioning.The positioning of the base station uses the calculation distance of the distance of the mobile phone to determine the location of the mobile phone. The latter does not require the mobile phone to haveGPSPositioning ability, but the accuracy depends to a large extent on the distribution and coverage of the base station, and sometimes the error will exceed one kilometer.

Advantages of mobile phone number positioning technology

1, Unique base station positioning technology (base station positioning technology, unique operator, low requirements for terminals)

2, New and informative electronic map (large proportional electronic map)

3, Rich communication channels (SMS, related call centers services)

4, Perfect security system (hardware custard, network guarantee, software confidentiality and certification)

5, Safe and reliable communication methods (high connection rate, no noise, non -eavesdropping, green)

62. Privacy protection (generally authorized by the person to be positioned)

Disclaimer: The above method stems from the index of the program system or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. It proves that it is valid. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;