CN111325965B - Method and system for transmitting data of external inspection instrument in real time - Google Patents

Method and system for transmitting data of external inspection instrument in real time Download PDF

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Publication number
CN111325965B
CN111325965B CN202010220562.2A CN202010220562A CN111325965B CN 111325965 B CN111325965 B CN 111325965B CN 202010220562 A CN202010220562 A CN 202010220562A CN 111325965 B CN111325965 B CN 111325965B
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detection
channel
management background
linear link
detection terminal
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CN111325965A (en
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许诗松
汪鑫
朱剑凯
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Hangzhou Highway Engineering Supervision & Consultant Co
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Hangzhou Highway Engineering Supervision & Consultant Co
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    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Abstract

The invention relates to the technical field of instrument management, and discloses a method and a system for transmitting data of an external inspection instrument in real time, wherein the method comprises a plurality of detection terminals, and the detection terminals send detection data to a management background through a first channel; the adjacent detection terminals are communicated through a second channel; the management background establishes a first linear link between all the detection terminals through a second channel, wherein the path of the first linear link is the shortest path passing through all the detection terminals in sequence; the management background compares the received detection data from the first channel of the same detection terminal with the detection data from the first linear link, and records and submits the detection data if the detection data are the same; if the detection data are different, the detection data from the first linear link are recorded and submitted, the detection terminal is unloaded out of the first linear link, the first linear link is reconstructed, and the management background carries out maintenance prompting on the detection terminal. The timeliness of giving reports is accelerated.

Description

Method and system for transmitting data of external inspection instrument in real time
Technical Field
The invention relates to the technical field of instrument management, in particular to a method and a system for transmitting data of an external inspection instrument in real time.
Background
On the municipal construction site, a lot of engineering materials and field devices can be detected, damaged places can be found in advance, generally, an equipment detection team can be assigned by the construction project department, the purchased detection equipment is used for detecting the engineering materials and the field devices on the construction site in sequence, and after the equipment detection team detects and registers all the engineering materials and the field devices, the registered watch is returned to the construction project department.
The above prior art solutions have the following drawbacks: the municipal construction site is very big, and the engineering material and the field equipment that the construction used are very dispersed moreover to apart from the construction project department very far away, consequently the construction project department as municipal construction master commander can't know the detection conditions of the engineering material and the field equipment of job site in time, is unfavorable for the risk factor of controlling the work progress.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for transmitting data of an external inspection instrument in real time, which has the advantage that the inspection instrument can transmit the inspection condition to the construction project part in real time. The invention also aims to provide a real-time data transmission system of the external inspection instrument, which has the advantage that the detection instrument can transmit the detection condition to the construction project department in real time.
In order to achieve the first purpose, the invention provides the following technical scheme:
a real-time data transmission method for an external inspection instrument comprises the following steps:
the method comprises the steps that a plurality of detection terminals used for detecting field instruments and generating detection data are arranged, the detection terminals are wirelessly connected with the same management background through first channels corresponding to one another one by one, and each detection terminal independently sends the detection data to the management background through the first channel of the detection terminal in real time;
establishing a second channel between the adjacent detection terminals, and communicating through the second channel, wherein each detection terminal simultaneously communicates with at most two adjacent detection terminals;
the management background establishes a first linear link between all the detection terminals through the second channel, a node of the first linear link is the detection terminal, a starting node of the first linear link is the detection terminal closest to the management background, an ending node of the first linear link is the detection terminal farthest from the management background, the detection terminal transmits the detection data to the management background in real time through the first linear link, and a path of the first linear link is a shortest path sequentially passing through all the detection terminals;
the management background compares the received detection data from the first channel of the same detection terminal with the detection data from the first linear link, and records and submits the detection data if the detection data are the same; if the detection data are different, recording and submitting the detection data from the first linear link, unloading the detection terminal out of the first linear link, reconstructing the first linear link, and prompting the maintenance of the detection terminal by the management background.
By adopting the technical scheme, the detection terminal can independently send detection data to the management background in real time through the first channel and also can send the detection data to the management background in real time through the first linear link, and the detection data does not need to be submitted after test detection personnel come back, so that the timeliness of issuing a report is accelerated; because the transmission distance of the second channel is less than that of the first channel, the stability of the second channel is stronger than that of the first channel, and whether the first channel is correctly transmitted or not can be tested in real time through the first linear link.
The present invention in a preferred example may be further configured to: the management background sends a test signal through the first linear link;
the detection terminal sends a test signal to the management background through the first channel after receiving a latest test signal, if the latest test signal is not received, a preset signal is sent to the management background periodically, and the preset signal, the test signal and the detection signal are different;
and sending a maintenance prompt after the management background sends the test signal, and prompting to maintain the detection terminal which continuously sends the preset signal.
By adopting the technical scheme, after the management background sends the test signal, if the detection terminal does not send the test signal but always sends the preset signal, the first linear link is not normal, the second channel with the detection terminal cannot normally communicate and needs to be overhauled, and therefore the accuracy of detection data transmission is guaranteed.
The present invention in a preferred example may be further configured to: the communication frequency of the first channel is lower than the communication frequency of the second channel.
By adopting the technical scheme, the lower the communication frequency is, the longer the communication distance is, the higher the communication frequency is, and the shorter the communication distance is, the faster the communication distance is, the more stable the communication distance is.
The present invention in a preferred example may be further configured to: and after the first channel loses the packet, the detection terminal only sends the detection data through a first linear link.
By adopting the technical scheme, the accuracy of data transmission is ensured.
The present invention in a preferred example may be further configured to: and after the second channel loses the packet, the detection terminal only sends the detection data through the first channel and sends an activation signal to the management background, so that the management background detects and sends a test signal for testing.
By adopting the technical scheme, the second channel is immediately tested through the first channel as soon as packet loss occurs, and the stability of subsequent data transmission is ensured.
In order to achieve the second purpose, the invention provides the following technical scheme:
a system for transmitting data of a surgical instrument in real time comprises:
the detection terminals are used for detecting the field instruments and generating detection data;
the management background is used for communicating with the detection terminals, the detection terminals are wirelessly connected with the same management background through first channels corresponding to one another, and each detection terminal independently sends the detection data to the management background through the first channel;
establishing a second channel between the adjacent detection terminals, and communicating through the second channel, wherein each detection terminal simultaneously communicates with at most two adjacent detection terminals;
the management background establishes a first linear link between all the detection terminals through the second channel, a node of the first linear link is the detection terminal, a starting node of the first linear link is the detection terminal closest to the management background, an ending node of the first linear link is the detection terminal farthest from the management background, the detection terminal transmits the detection data to the management background in real time through the first linear link, and a path of the first linear link is a shortest path sequentially passing through all the detection terminals;
the management background comprises:
a comparison module, configured to compare the received detection data from the first channel of the same detection terminal with the detection data from the first linear link;
the decision-making module is used for judging whether the comparison modules are the same or not, recording and submitting detection data; if the detection data are different, recording and submitting the detection data from the first linear link, unloading the detection terminal out of the first linear link, reconstructing the first linear link, and prompting maintenance of the detection terminal.
By adopting the technical scheme, the detection terminal can independently send detection data to the management background in real time through the first channel and also can send the detection data to the management background in real time through the first linear link, and the detection data does not need to be submitted after test detection personnel come back, so that the timeliness of issuing a report is accelerated; the comparison module compares the detection data of different channels, because the transmission distance of the second channel is less than that of the first channel, the stability of the second channel is stronger than that of the first channel, and simultaneously whether the first channel is correctly transmitted can be tested in real time through the first linear link.
The present invention in a preferred example may be further configured to: the management background comprises the following steps:
the test module is used for sending a test signal through the first linear link;
the detection terminal comprises:
the receiving module is used for sending a test signal to the management background through the first channel after receiving the latest test signal, and sending a preset signal to the management background periodically if the latest test signal is not received, wherein the preset signal, the test signal and the detection signal are different;
the management background comprises the following steps:
and the prompt module is used for sending a maintenance prompt after the test signal is sent, and prompting the maintenance of the detection terminal which continuously sends the preset signal.
By adopting the technical scheme, after the test module sends the test signal, the receiving module judges that if the detection terminal does not send the test signal but always sends the preset signal, the first linear link is not normal, the second channel with the detection terminal cannot normally communicate, and the prompting module prompts that the detection data needs to be maintained, so that the accuracy of detection data transmission is ensured.
The present invention in a preferred example may be further configured to: the communication frequency of the first channel is lower than the communication frequency of the second channel.
By adopting the technical scheme, the lower the communication frequency is, the longer the communication distance is, the higher the communication frequency is, and the shorter the communication distance is, the faster the communication distance is, the more stable the communication distance is.
The present invention in a preferred example may be further configured to: and after the first channel loses the packet, the detection terminal only sends the detection data through a first linear link.
By adopting the technical scheme, the accuracy of data transmission is ensured.
The present invention in a preferred example may be further configured to: and after the second channel loses the packet, the detection terminal only sends the detection data through the first channel and sends an activation signal to the management background, so that the management background detects and sends a test signal for testing.
By adopting the technical scheme, the second channel is immediately tested through the first channel as soon as packet loss occurs, and the stability of subsequent data transmission is ensured.
In summary, the invention includes at least one of the following beneficial technical effects:
(1) the first channel and the first linear link are established between the management background and the detection terminal, so that multi-channel transmission of data is realized, the detection terminal can independently send detection data to the management background in real time through the first channel and also can send the detection data to the management background in real time through the first linear link, detection data do not need to be submitted after test detection personnel come back, and timeliness of report issuing is accelerated;
(2) by setting the transmission distance of the second channel to be smaller than that of the first channel and the stability of the second channel to be stronger than that of the first channel, whether the first channel is correctly transmitted or not is tested in real time through the first linear link, and if the first channel cannot be correctly transmitted, an alarm is prompted and a detection terminal is maintained, so that the accuracy of data is ensured;
(3) after the second channel loses packets, the detection data is only sent through the first channel, and an activation signal is sent to the management background, so that the management background can perform testing, and the stability of subsequent data transmission is ensured.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
fig. 2 is a block diagram of the system of the present invention.
Reference numerals: 1. detecting a terminal; 2. managing a background; 3. a first channel; 4. a second channel; 5. a first linear link; 6. a comparison module; 7. a decision-making module; 8. a test module; 9. an acceptance module; 10. and a prompt module.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The first embodiment is as follows:
referring to fig. 1, the method for transmitting data of an external inspection instrument in real time disclosed by the invention comprises the following steps:
a plurality of detection terminals 1 used for detecting field instruments and generating detection data are arranged, the detection terminals 1 are all in wireless connection with the same management background 2 through first channels 3 in one-to-one correspondence, and each detection terminal 1 independently sends the detection data to the management background 2 through the first channel 3. Detection terminal 1 CAN adopt intelligent equipment of android system or IOS system, the MCU singlechip, PLC or FPGA and the control center that their peripheral circuit constitutes, control center data connection has 433Mhz, NRF24L01, GPS, bluetooth, WIFI and GPRS etc. communication module, the last pin that receives communication signal that is equipped with of control center to there are compatible same communication protocol's sensor or other control centers who has a plurality of sensors through pin data connection, communication protocol CAN be IIC, IIS, SPI, UART or CAN etc. field communication protocols. The detection terminal 1 performs detection communication with a field instrument through a field communication protocol to acquire detection data, for example, the detection terminal 1 communicates with a vehicle-mounted computer of the excavator through a UART. The client can adopt the smart machine that has android system or IOS system of operation, is equipped with communication module such as 433Mhz, NRF24L01, GPS, bluetooth, WIFI and GPRS in the smart machine, still is equipped with the touch-sensitive screen that is used for showing data and receiving input in the smart machine.
A second channel 4 is established between adjacent detection terminals 1, communication is carried out through the second channel 4, and each detection terminal 1 is communicated with at most two adjacent detection terminals 1 at the same time. First channel 3 adopts 433Mhz module, and second channel 4 adopts NRF24L01 module, bluetooth or WIFI module, and first channel 3's communication frequency is less than the communication frequency who adopts second channel 4, and communication frequency is lower, and communication distance is longer more, and communication frequency is higher, and communication distance is shorter more fast more stable.
The management background 2 establishes a first linear link 5 between all the detection terminals 1 through the second channel 4, the node of the first linear link 5 is the detection terminal 1, the starting node of the first linear link 5 is the detection terminal 1 closest to the management background 2, and the detection terminal 1 closest to the management background 2 can be in data connection with the management background 2 through the second channel 4. The end node of the first linear link 5 is the detection terminal 1 farthest from the management background 2, the detection terminal 1 transmits detection data to the management background 2 in real time through the first linear link 5, and the path of the first linear link 5 is the shortest path passing through all the detection terminals 1 in sequence. The detection terminal 1 sends the position information generated by the GPS module to the management background 2, the management background 2 calculates the shortest path according to the position information by using the existing shortest path algorithm to form a basis for forming the first linear link 5, the shortest path is calculated, then the sequence of the path is sent to the detection terminal 1, and the detection terminal 1 completes connection by using the second channel 4 according to the sequence to form the first linear link 5.
The management background 2 compares the received detection data from the first channel 3 of the same detection terminal 1 with the detection data from the first linear link 5, and records and submits the detection data if the detection data are the same; if the difference is not the same, the detection data from the first linear link 5 is recorded and submitted, the detection terminal 1 is unloaded out of the first linear link 5, the first linear link 5 is reconstructed, and the management background 2 prompts the maintenance of the detection terminal 1.
The management background 2 sends a test signal over the first linear link 5. The detection terminal 1 sends a test signal to the management background 2 through the first channel 3 after receiving the latest test signal, if the latest test signal is not received, a preset signal is sent to the management background 2 periodically, and the preset signal, the test signal and the detection signal are different. And the management background 2 sends a maintenance prompt after sending the test signal, and the prompt is used for maintaining the detection terminal 1 which continuously sends the preset signal. After the first channel 3 loses the packet, the detection terminal 1 sends the detection data to the management background 2 only through the first linear link 5. After the packet loss of the second channel 4 occurs, the detection terminal 1 only sends detection data to the management background 2 through the first channel 3, and sends an activation signal to the management background 2, so that the management background 2 detects and sends a test signal for testing. And the second channel 4 immediately tests through the first channel 3 when packet loss occurs, so that the stability of subsequent data transmission is ensured.
The implementation principle of the embodiment is as follows: the management background 2 is arranged in the construction project department, personnel who overhaul teams and groups carry the detection terminal 1 to overhaul on-site equipment, the detection terminal 1 can independently send detection data to the management background 2 in real time through the first channel 3 after detection results exist, meanwhile, the detection terminal 1 can also send the detection data to the management background 2 in real time through the first linear link 5, the detection data do not need to be submitted after test detection personnel return, and timeliness of a report is accelerated. In the process of managing the communication between the background 2 and the detection terminal 1, because the transmission distance of the second channel 4 is smaller than that of the first channel 3, the stability of the second channel 4 is stronger than that of the first channel 3, and meanwhile, whether the first channel 3 is correctly transmitted can be tested in real time through the first linear link 5, if the first channel 3 cannot be correctly transmitted, an alarm is prompted and the detection terminal 1 is maintained, so that the accuracy of data is ensured. The management background 2 sends a test signal at regular time, and if the detection terminal 1 does not send the test signal but sends a preset signal all the time, it represents that the first linear link 5 is not normal, and the second channel 4 with the detection terminal 1 cannot normally communicate and needs to be maintained, so as to improve the effect of ensuring the transmission accuracy of the detection data.
Example two:
referring to fig. 2, the invention discloses a system for transmitting data of an external inspection instrument in real time, which comprises:
and a plurality of test terminals 1 for testing the field instruments and generating test data.
The management background 2 is used for communicating with the detection terminals 1, the detection terminals 1 are wirelessly connected with the same management background 2 through the first channels 3 in one-to-one correspondence, and each detection terminal 1 independently sends detection data to the management background 2 through the first channel 3.
A second channel 4 is established between adjacent detection terminals 1, communication is carried out through the second channel 4, and each detection terminal 1 is communicated with at most two adjacent detection terminals 1 at the same time. The communication frequency of the first channel 3 is lower than the communication frequency using the second channel 4. The lower the communication frequency, the longer the communication distance, the higher the communication frequency, and the shorter the communication distance, the faster and the more stable.
The management background 2 establishes a first linear link 5 between all the detection terminals 1 through a second channel 4, a node of the first linear link 5 is the detection terminal 1, a starting node of the first linear link 5 is the detection terminal 1 closest to the management background 2, an ending node of the first linear link 5 is the detection terminal 1 farthest from the management background 2, the detection terminal 1 transmits detection data to the management background 2 through the first linear link 5 in real time, a path of the first linear link 5 is a shortest path sequentially passing through all the detection terminals 1, and the detection terminal 1 closest to the management background 2 can be in data connection with the management background 2 through the second channel 4.
The management background 2 includes:
a comparison module 6 for comparing the received detection data from the first channel 3 of the same detection terminal 1 with the detection data from the first linear link 5.
The decision module 7 is used for judging whether the comparison modules 6 are the same or not, recording and submitting detection data; if the difference is not the same, the detection data from the first linear link 5 is recorded and submitted, the detection terminal 1 is unloaded out of the first linear link 5, the first linear link 5 is reconstructed, and the maintenance prompt of the detection terminal 1 is carried out.
A test module 8 for sending test signals over the first linear link 5.
The detection terminal 1 comprises a receiving module 9, the receiving module 9 is used for sending a test signal to the management background 2 through the first channel 3 after receiving a latest test signal, if the latest test signal is not received, a preset signal is sent to the management background 2 periodically, and the preset signal, the test signal and the detection signal are different. The management background 2 comprises a prompt module 10, and the prompt module 10 is used for sending a maintenance prompt after sending the test signal to prompt maintenance of the detection terminal 1 which continuously sends the preset signal. After the first channel 3 loses the packet, the detecting terminal 1 only sends the detecting data through the first linear link 5. After the second channel 4 loses the packet, the detection terminal 1 only sends the detection data through the first channel 3, and sends the activation signal to the management background 2, so that the management background 2 detects and sends the test signal for testing. And the second channel 4 immediately tests through the first channel 3 when packet loss occurs, so that the stability of subsequent data transmission is ensured.
The implementation principle of the embodiment is as follows: the detection terminal 1 can independently send detection data to the management background 2 in real time through the first channel 3 and also can send the detection data to the management background 2 in real time through the first linear link 5, and the detection data does not need to be submitted after test detection personnel come back, so that the timeliness of a report is accelerated; the comparison module 6 compares the detection data of different channels, because the transmission distance of the second channel 4 is smaller than that of the first channel 3, the stability of the second channel 4 is stronger than that of the first channel 3, and simultaneously, whether the first channel 3 is correctly transmitted can be tested in real time through the first linear link 5, if the first channel 3 cannot be correctly transmitted, the decision module 7 prompts an alarm and maintains the detection terminal 1, and the accuracy of the data is ensured. After the test module 8 sends the test signal, the receiving module 9 determines that if the detection terminal 1 does not send the test signal but always sends the preset signal, it represents that the first linear link 5 is not normal, wherein the second channel 4 of the detection terminal 1 cannot normally communicate, and the prompting module 10 prompts that maintenance is needed, so as to ensure the accuracy of detection data transmission.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. A real-time data transmission method for an external inspection instrument is characterized by comprising the following steps:
the method comprises the steps that a plurality of detection terminals (1) used for detecting field instruments and generating detection data are arranged, the detection terminals (1) are wirelessly connected with the same management background (2) through first channels (3) which correspond to one another one by one, and each detection terminal (1) independently sends the detection data to the management background (2) through the first channel (3) of the detection terminal in real time;
a second channel (4) is established between the adjacent detection terminals (1), communication is carried out through the second channel (4), and each detection terminal (1) is simultaneously communicated with at most two adjacent detection terminals (1);
the management background (2) establishes a first linear link (5) between all the detection terminals (1) through the second channel (4), a node of the first linear link (5) is the detection terminal (1), a starting node of the first linear link (5) is the detection terminal (1) closest to the management background (2), an ending node of the first linear link (5) is the detection terminal (1) farthest from the management background (2), the detection terminal (1) transmits the detection data to the management background (2) through the first linear link (5) in real time, and a path of the first linear link (5) is a shortest path sequentially passing through all the detection terminals (1);
the management background (2) compares the received detection data from the first channel (3) of the same detection terminal (1) with the detection data from the first linear link (5), and records and submits the detection data if the detection data are the same; if the detection data are different, the detection data from the first linear link (5) are recorded and submitted, the detection terminal (1) is unloaded out of the first linear link (5) and the first linear link (5) is reconstructed, and the management background (2) prompts maintenance of the detection terminal (1).
2. The method according to claim 1, characterized in that the management background (2) sends a test signal over the first linear link (5);
the detection terminal (1) sends a test signal to the management background (2) through the first channel (3) after receiving a latest test signal, if the latest test signal is not received, a preset signal is sent to the management background (2) periodically, and the preset signal, the test signal and the detection signal are different;
and the management background (2) sends a maintenance prompt after sending the test signal, and the maintenance prompt is used for maintaining the detection terminal (1) which continuously sends the preset signal.
3. A method according to claim 1, characterized in that the communication frequency of the first channel (3) is lower than the communication frequency of the second channel (4).
4. The method according to claim 1, characterized in that said detection terminal (1) transmits said detection data only via a first linear link (5) after a packet loss on said first channel (3).
5. The method according to claim 2, wherein after the second channel (4) loses the packet, the detection terminal (1) sends the detection data only through the first channel (3), and sends an activation signal to the management background (2), so that the management background (2) detects and sends a test signal for testing.
6. A system for transmitting data of external inspection instruments in real time is characterized by comprising:
a plurality of inspection terminals (1) for inspecting field instruments and generating inspection data;
the management background (2) is used for communicating with the detection terminals (1), the detection terminals (1) are wirelessly connected with the same management background (2) through first channels (3) which correspond to one another one by one, and each detection terminal (1) independently sends the detection data to the management background (2) through the first channel (3) of the detection terminal in real time;
a second channel (4) is established between the adjacent detection terminals (1), communication is carried out through the second channel (4), and each detection terminal (1) is simultaneously communicated with at most two adjacent detection terminals (1);
the management background (2) establishes a first linear link (5) between all the detection terminals (1) through the second channel (4), a node of the first linear link (5) is the detection terminal (1), a starting node of the first linear link (5) is the detection terminal (1) closest to the management background (2), an ending node of the first linear link (5) is the detection terminal (1) farthest from the management background (2), the detection terminal (1) transmits the detection data to the management background (2) through the first linear link (5) in real time, and a path of the first linear link (5) is a shortest path sequentially passing through all the detection terminals (1);
the management backend (2) comprises:
-a comparison module (6) for comparing the detection data received from said first channel (3) by the same detection terminal (1) with said detection data from said first linear link (5);
the decision module (7) is used for judging whether the comparison modules (6) are the same or not, recording and submitting detection data; if the detection data are different, recording and submitting the detection data from the first linear link (5), unloading the detection terminal (1) out of the first linear link (5), reconstructing the first linear link (5), and prompting maintenance of the detection terminal (1).
7. System according to claim 6, characterized in that said management background (2) comprises:
-a test module (8) for sending a test signal over said first linear link (5);
the detection terminal (1) comprises:
the receiving module (9) is used for sending a test signal to the management background (2) through the first channel (3) after receiving the latest test signal, if the latest test signal is not received, a preset signal is sent to the management background (2) periodically, and the preset signal, the test signal and the detection signal are different;
the management background (2) comprises:
and the prompt module (10) is used for sending a maintenance prompt after the test signal is sent, and prompting the maintenance of the detection terminal (1) which continuously sends the preset signal.
8. A system according to claim 6, characterized in that the communication frequency of the first channel (3) is lower than the communication frequency of the second channel (4).
9. The system according to claim 6, characterized in that said detection terminal (1) transmits said detection data only via said first linear link (5) after said first channel (3) has lost packets.
10. The system according to claim 7, wherein after the packet loss of the second channel (4), the detection terminal (1) sends the detection data only through the first channel (3), and sends an activation signal to the management background (2), so that the management background (2) detects and sends a test signal for testing.
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