CN204697070U - Time signal generator and time tester - Google Patents
Time signal generator and time tester Download PDFInfo
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- CN204697070U CN204697070U CN201520453949.7U CN201520453949U CN204697070U CN 204697070 U CN204697070 U CN 204697070U CN 201520453949 U CN201520453949 U CN 201520453949U CN 204697070 U CN204697070 U CN 204697070U
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Abstract
The utility model belongs to the technical field of time synchronized, is specifically related to a kind of time signal generator and time tester.A kind of time signal generator, comprises frequency module, time module, time reference module, output control module and output module; Described frequency module and described time module all with described time reference model calling; Described frequency module is used for providing reference oscillating frequency to described time reference module; Described time module is used for described time reference module with time information; Described time reference module is according to reference oscillating frequency and temporal information generation time benchmark; Described time reference module is all connected with described output control module with described output module; Described time reference module is used for the time reference of generation to send to described output control module; Described output control module is used for the time reference received to be converted to dissimilar time signal, and this time signal is exported by described output module.The utility model time tester can the time deviation of the dissimilar equipment of direct-detection, uses simpler, more convenient.
Description
Technical field
The utility model belongs to the technical field of time synchronized, is specifically related to a kind of time signal generator and time tester.
Background technology
In the industry such as electric power, communication, permitted multiple services normal operation and all to be required in system time synchronized between distinct device.Time tester is the instrument of the time deviation for checkout equipment, for judging between distinct device, whether the retention time synchronously provides foundation.Current time tester is usually with global positioning system (GlobalPositioning System, hereinafter referred to as GPS) as clock source, to obtain GPS absolute time, reference oscillating frequency is obtained again by rubidium clock, then the GPS absolute time of this reference oscillating frequency and acquisition is done further process by time tester, with generation time benchmark, time tester is according to the time deviation of this time reference checkout equipment.At electric power, in the industries such as communication, need by the device type of time tester detection varied, and the time signal of dissimilar equipment under test is also different, such as, the time signal of equipment under test may be IRIG-B (Inter Range Instrumentation Group, U.S.'s target range instrument group) signal, may be 1PPS (pulse per second, pulse per second (PPS))+TOD (Time of Day, Time of Day information) signal, also may be PTP (Precision Time Protocol, Precision Time Protocol) or NTP (NetworkTime Protocol, NTP (Network Time Protocol)) signal.And current time tester usual output frequency standard or only export a kind of time signal, when detecting dissimilar equipment, the output signal of time tester time signal that is frequent and equipment under test is inconsistent, at this moment the output signal of time tester is changed with regard to needing or decodes, make testing process more complicated.
Utility model content
The problem that during in order to solve that current service time, tester detected dissimilar equipment, process is more complicated, the utility model proposes a kind of time signal generator and time tester, the process of dissimilar equipment is detected to simplify service time tester, make the use of time tester simpler, more convenient.
The utility model time signal generator comprises frequency module, time module, time reference module, output control module and output module; Described frequency module and described time module all with described time reference model calling; Described frequency module is used for providing reference oscillating frequency to described time reference module; Described time module is used for described time reference module with time information; Described time reference module is according to reference oscillating frequency and temporal information generation time benchmark; Described time reference module is all connected with described output control module with described output module; Described time reference module is used for the time reference of generation to send to described output control module; Described output control module is used for the time reference received to be converted to dissimilar time signal, and this time signal is exported by described output module.
Wherein, this time signal generator also comprises judge module, this judge module is connected with described output control module, for judging the type of equipment under test time signal, and the time signal type information of equipment under test is sent to described output control module, described output control module, according to the time signal type information of the equipment under test received, determines the type of the time signal exported, corresponding with the time signal of the time signal with equipment under test that make output.
Wherein, also comprise display module, this display module is connected with described output control module, for showing the information of described output control module.
Wherein, described display module is LCD.
Wherein, described time module is GPS transceiver.
Wherein, described time module is BDS transceiver.
Wherein, described frequency module is caesium clock.
Wherein, described dissimilar time signal is IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal.
The utility model also proposes a kind of time tester comprising any one time signal generator above-mentioned, the test module of this time tester is connected with the output module of described time signal generator, dissimilar time signal is sent to described test module by described output module, and this test module measures the time deviation of Devices to test according to the time signal received.
Wherein, described Devices to test is time and frequency measurement device, B code output device or 4G device.
The utility model time signal generator and time tester have following beneficial effect:
Time reference module generation time benchmark of the present utility model, the time reference that time reference module produces is converted to the time signal of number of different types by output control module, such as IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal, with corresponding with dissimilar equipment under test.Output control module of the present utility model detects the type of equipment under test time signal by judge module, then exports the time signal corresponding with the type of equipment under test time signal according to the type of equipment under test time signal.The utility model time signal generator can export the time signal of number of different types, corresponding with the type of the time signal with equipment under test.When using the utility model to comprise the time deviation of time tester checkout equipment of time signal generator, time tester is connected with equipment under test, the utility model time tester can export the time signal corresponding with equipment under test according to equipment under test type automatically, directly just can detect the time deviation of equipment under test, do not need the time signal to time tester exports change again or decode, simplify the process of the time deviation detecting distinct device.The utility model time tester can export the time signal of number of different types, with corresponding with dissimilar equipment, uses the utility model time tester can the time deviation of the dissimilar equipment of direct-detection, uses simpler, more convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model time signal generator;
Fig. 2 is the workflow diagram of the utility model time signal generator;
Fig. 3 is the schematic diagram of a kind of preferred structure of the utility model time signal generator;
Fig. 4 is the structural representation of the utility model time tester;
Fig. 5 is the principle schematic of PTP time signal.
Embodiment
The technical solution of the utility model is introduced below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model time signal generator comprises frequency module 13, time module 15, time reference module 14, output control module 10, judge module 11 and output module 12.Frequency module 13 is connected with time reference module 14, for providing reference oscillating frequency to time reference module 14.Time module 15 is connected with time reference module 14, for providing temporal information to time reference module 14.Time reference module 14 is according to reference oscillating frequency and temporal information generation time benchmark.Time reference module 14 is connected with output control module 10, for the time reference of generation is sent to output control module 10.Output module 12 is connected with output control module 10, and output control module 10 is for being converted to dissimilar time signal by the time reference received, and this time signal is exported by output module 12.Judge module 11 is connected with output control module 10, for judging the type of equipment under test time signal, and the time signal type information of equipment under test is sent to output control module 10, output control module 10 is according to the time signal type information of the equipment under test received, determine the type of the time signal exported, corresponding with the time signal of the time signal with equipment under test that make output.
Introduce the technical solution of the utility model in detail below.
Frequency module 13 is connected with time reference module 14, for providing reference oscillating frequency to time reference module 14, frequency module 13 can be caesium clock or rubidium clock, preferred use caesium clock, because the reference oscillating frequency precision that caesium clock produces is higher, the reference oscillating frequency that precision can be provided higher for time reference module 14.Time module 15 is connected with time reference module 14, and for providing temporal information to time reference module 14, time module 15 can be GPS transceiver, and such time module 15 provides GPS precise absolute time to time reference module 14; Time module 15 also can be BDS (BeiDou Navigation Satellite System, Beidou satellite navigation system) transceiver, and such time module 15 provides BDS precise absolute time to time reference module 14; Time module 15 also can be to provide the clock source of relative time, and the type of time module 15 is decided according to the actual requirements.The reference oscillating frequency that time reference module 14 pairs of frequency module 13 provide and the temporal information that time module 15 provides process, with generation time benchmark.
Such as, frequency module 13 is rubidium clock, and time module 15 is GPS transceiver, and GPS precise absolute time information is sent to time reference module 14 by time module 15, and time reference module 14 obtains GPS precise absolute time information; Rubidium clock produces reference oscillating frequency, and this reference oscillating frequency is sent to time reference module 14, time reference module 14 obtains reference oscillating frequency from rubidium clock, then by GPS precise absolute time information and reference oscillating frequency through algorithm process, process rear generation time benchmark, this time reference can be understood as a kind of time signal, and this time signal carries GPS precise absolute time information, and is made up of timing code unit.
Such as, frequency module 13 is caesium clock, and time module 15 is GPS transceiver, and time module 15 provides GPS precise absolute time information for time reference module 14, and time reference module 14 obtains GPS precise absolute time information from time module 15; Caesium clock can produce the higher reference oscillating frequency of precision, and this reference oscillating frequency is sent to time reference module 14, time reference module 14 obtains reference oscillating frequency from caesium clock, then by GPS precise absolute time information and reference oscillating frequency through algorithm process, process rear generation time benchmark, this time reference refers to a kind of time signal, and this time signal carries GPS precise absolute time information, and is made up of timing code unit.
Such as, frequency module 13 is rubidium clock, and time module 15 is BDS transceiver, BDS precise absolute time information is sent to time reference module 14 by time module 15, BDS is by Chinese independent research and the navigation system that puts into effect, compares the GPS using and controlled by US military, uses BDS safer.Time reference module 14 obtains BDS precise absolute time information from time module 15.Rubidium clock belongs to atomic clock, for generation of reference oscillating frequency this reference oscillating frequency sent to time reference module 14, time reference module 14 obtains reference oscillating frequency, then by BDS precise absolute time information and reference oscillating frequency through algorithm process, process rear generation time benchmark, this time reference can be understood as a kind of time signal, and this time signal carries GPS precise absolute time information, and is made up of timing code unit.
Such as, frequency module 13 is caesium clock, and time module 15 is BDS transceiver, and BDS precise absolute time information sends to time reference module 14, BDS to be by Chinese independent research and the navigation system that puts into effect by time module 15, uses BDS safety and reliability.Time reference module 14 obtains BDS precise absolute time information from time module 15.Caesium clock belongs to atomic clock, the higher reference oscillating frequency of precision can be produced and this reference oscillating frequency is sent to time reference module 14, time reference module 14 obtains reference oscillating frequency, then by BDS precise absolute time information and reference oscillating frequency through algorithm process, process rear generation time benchmark, this time reference can be understood as a kind of time signal, and this time signal carries GPS precise absolute time information, and is made up of timing code unit.
Time reference module 14 is all connected with output control module 10 with output module 12, time reference module 14 is for sending to output control module 10 by the time reference of generation, output control module 10 for the time reference received being converted to the time signal of number of different types, such as IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal.
IRIG (Inter Range Instrumentation Group) is the abbreviation of U.S.'s target range instrument group, a kind of time standard that the target range commandant committee of the IRIG Ma Shi U.S. formulates, and is now widely used in the numerous areas such as military affairs, business, industry.IRIG code has four kinds of parallel binary timing code forms and six kinds of serial binary timing code forms, and wherein, the most frequently used is IRIG-B timing code form.IRIG-B time signal is exactly the time signal be made up of IRIG-B code, and IRIG-B code is the serial time code of a frame per second, and each frame comprises 100 IRIG-B time code elements, and the width of each time code element is 10ms.According to the standard definition of IRIG-B code, IRIG-B time code element has 3 types, i.e. P code element, 1 code element and 0 code element, P code element is flag bit, 1 code element represents binary one, and 0 code element represents binary zero, and IRIG-B code is exactly the transmission of the combination finishing time information by these three kinds of code elements.
The parameter of the 1PPS+TOD time signal of current use is: TOD information baud rate is defaulted as 9600, no parity, 1 start bit (representing by low level), 1 position of rest (representing with high level), idle frame is high level, 8 data bit, should start to transmit TOD information after 1PPS rising edge 1ms, and passed in 500ms, this TOD message indicates current 1PPS and triggers rising time.TOD protocol massages transmission frequency is 1 time per second.TOD signal is the mode of ASCII (American Standard Code for InformationInterchange, USA standard code for information interchange) code.For 1PPS pulse per second (PPS), adopt rising edge as punctual edge, the rise time should be less than 50ns, and pulsewidth should be 20ms ~ 200ms.
The network applying PTP protocol is called PTP territory, and PTP territory comprises master clock and from clock, carries out time synchronized between clock and master clock by PTP time signal.Particularly, as shown in Figure 5, master clock periodically to the synchronous Sync message of broadcast transmission on network, meanwhile, master clock monitors and is stabbed as the precise time of sync message by the time T1 of actual for above-mentioned sync message transmission, and carries T1 in Follow_Up message subsequently.From clock after receiving Sync sync message, first write down the T2 accurate time of advent of message, then receive Follow_Up message, take-off time stamp T1 from Follow_Up message.In order to obtain the propagation delay time of principal and subordinate's clock, in network from clock with mode of unicast to master clock forward delay interval request Delay_Req message, record the actual transmitting time T3 of this message at network interface place simultaneously.Correspondingly, the T4 accurate time of advent of this message when master clock receives latency request message, can be write down, and in Delay_Resp message subsequently, send T4 to from clock, after receiving Delay_Resp message from clock, therefrom take-off time stamp T4.Just time stamp T 1, T2, T3, T4 is obtained like this from clock, just side-play amount offset and the propagation delay time delay of principal and subordinate's clock can be calculated according to these four time values, adjust the time of oneself according to side-play amount offset and propagation delay time delay from clock, thus it is synchronous to realize principal and subordinate's clock.
NTP is used to the ICP/IP protocol issuing precise time in whole network, the transmission of itself based on UDP, remaining end slogan 123.It can make computer or the network equipment to its server or clock source (as quartz clock, GPS etc.) do synchronization, (LAN is upper is less than 1 millisecond with standard room difference can to provide the time adjustment of high accurancy and precision, WAN upper a few tens of milliseconds), and vicious protocol attack can be prevented via the mode of encrypted acknowledgment.NTP provides correct time, and correct time first will be had to originate, and this time should be universal time UTC.The time source that NTP obtains UTC can be atomic clock, observatory, satellite, also can obtain from Internet.So just there is time source accurately and reliably.
Judge module 11 is connected with output control module 10, for judging the type of equipment under test time signal, and the type information of equipment under test time signal is sent to output control module 10.Different time signals, such as IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal, these time signals have the definition of standard, the time code element of these time signals and the width of time code element are all different, such as IRIG-B time signal comprises the code element of 3 types, i.e. P code element, 1 code element and 0 code element, the width of each time code element is 10ms; The TOD information of 1PPS+TOD time signal adopts the mode of ASCII character, 1PPS pulse per second (PPS) adopts rising edge as punctual edge, rise time should be less than 50ns, pulsewidth should be 20ms ~ 200ms, start to transmit TOD information after 1PPS rising edge 1ms, therefore judge module 11 judges the type of equipment under test time signal according to the width of time code element and type.
The time signal of dissimilar equipment under test is also different, so after detecting the type of equipment under test time signal, just can export the time signal corresponding with the time signal of equipment under test according to the type of equipment under test time signal.Output control module 10, according to the type information of the equipment under test time signal received, is determined to export any time signal, and this time signal is exported by output module 12, corresponding with the time signal of the time signal with equipment under test that make output.Such as, when the time signal of equipment under test is IRIG-B time signal, according to the type of time code element and width, judge module 11 judges that the time signal of equipment under test is IRIG-B time signal, then judged result is sent to output control module 10, output control module 10 is determined to export IRIG-B time signal according to the type of equipment under test time signal, and by output module 12, this IRIG-B time signal is exported, to detect the time deviation of equipment under test.
As shown in Figure 2, the workflow of the utility model time signal generator is:
Step S1, frequency module 13 provides reference oscillating frequency to time reference module 14, and frequency module 13 can be caesium clock or rubidium clock, preferably uses caesium clock, because the reference oscillating frequency precision that caesium clock produces is higher, the reference oscillating frequency that precision can be provided higher for time reference module 14.Time reference module 14 obtains reference oscillating frequency.
Step S2, time module 15 provides temporal information to time reference module 14, time module 15 can be GPS transceiver or BDS transceiver, think that time reference module 14 provides accurate GPS or BDS absolute time, namely the time signal of GPS or BDS is sent to time reference module 14, time reference module 14 obtains accurate GPS or BDS absolute time information.Time module 15 also can be to provide the clock source of relative time, and relative time information is sent to time reference module 14 by time module 15, and time reference module 14 obtains relative time information.
Step S3, time reference module 14 receives reference oscillating frequency that frequency module 13 provides and the temporal information that time module 15 provides, and further algorithm process is done to reference oscillating frequency and temporal information, process rear generation time benchmark, this time reference can be understood as a kind of time signal, this time signal carries GPS precise absolute time information, and is made up of timing code unit.
Step S4, judge module 11 judges the type of equipment under test time signal, and the type information of equipment under test time signal is sent to output control module 10.Different time signals, such as IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal, these are all existing time reference signals, but the width of the time code element of these time signals and time code element is different, such as IRIG-B time signal comprises the code element of 3 types, i.e. P code element, 1 code element and 0 code element, the width of each time code element is 10ms; The TOD information of 1PPS+TOD time signal adopts the mode of ASCII character, 1PPS pulse per second (PPS) adopts rising edge as punctual edge, rise time should be less than 50ns, pulsewidth should be 20ms ~ 200ms, start to transmit TOD information after 1PPS rising edge 1ms, therefore judge module 11 judges the type of equipment under test time signal according to the width of time code element and type.
Step S5, the time reference of generation is sent to output control module 10 by time reference module 14, output control module 10 converts the time reference received the time signal of number of different types to, such as IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal.Output control module 10 receives the time signal type information of the equipment under test that judge module 11 sends, and according to the type information of the equipment under test time signal received, determine to export the time signal corresponding with the time signal type of equipment under test, because the time signal of dissimilar equipment under test is also different, so after detecting the type of equipment under test time signal, just the time signal corresponding with the time signal of equipment under test can be exported according to the type of equipment under test time signal.Such as judge module 11 detects that the type of Devices to test time signal is 1PPS+TOD time signal, and the type information of Devices to test time signal is sent to output control module 10, control module 10 is according to the type information of the Devices to test time signal received, determine to export 1PPS+TOD time signal, corresponding with the time signal of the time signal with equipment under test that make output.
Step S6, the time signal corresponding with the time signal of equipment under test is exported by output module 12 by output control module 10.
Fig. 3 is the schematic diagram of a kind of preferred structure of the utility model time signal generator, time signal generator shown in time signal generator shown in Fig. 3 and Fig. 1 is unlike also comprising display module 16, this display module 16 is connected with output control module 10, for the information of display translation control module 10.Such as, display translation control module 10 can export the time signal of which type, and the time signal type information of the equipment under test that display judge module 11 sends, shows the time signal type that current output control module 10 exports.Wherein display module 16 can be LCD (Liquid Crystal Display, liquid crystal display).
The utility model also proposes a kind of time tester, this time tester comprises test module and above-mentioned time signal generator, as shown in Figure 4, time tester comprises frequency module 13, time module 15, time reference module 14, output control module 10, judge module 11, output module 12 and test module 17.Frequency module 13 is connected with time reference module 14, for providing reference oscillating frequency to time reference module 14.Time module 15 is connected with time reference module 14, for providing temporal information to time reference module 14.Time reference module 14 is according to reference oscillating frequency and temporal information generation time benchmark.Time reference module 14 is connected with output control module 10, for the time reference of generation is sent to output control module 10.Output module 12 is connected with output control module 10, and output control module 10 is for being converted to dissimilar time signal by the time reference received, and this time signal is exported by output module 12.Judge module 11 is connected with output control module 10, for judging the type of equipment under test time signal, and the time signal type information of equipment under test is sent to output control module 10, output control module 10 is according to the time signal type information of the equipment under test received, determine the type of the time signal exported, corresponding with the time signal of the time signal with equipment under test that make output.Test module 17 is connected with output module 12, time signal corresponding for time signal type with Devices to test is sent to test module 17 by this output module 12, this test module receives the time signal that output module 12 sends, and measures the time deviation of Devices to test according to the time signal received.Wherein, Devices to test can be time and frequency measurement device, B code output device or 4G device.
The utility model time signal generator can export the time signal of number of different types, with corresponding with the time signal type of equipment under test.When using the utility model to comprise the time deviation of time tester measuring equipment of time signal generator, time tester is connected with equipment under test, time tester can export the time signal corresponding with equipment under test according to equipment under test type automatically, directly just can detect the time deviation of equipment under test, do not need the time signal to time tester exports change again or decode, simplify the process of the time deviation detecting distinct device.The utility model time tester can export the time signal of number of different types, with corresponding with dissimilar equipment, uses the utility model time tester can the time deviation of the dissimilar equipment of direct-detection, uses simpler, more convenient.
Claims (10)
1. a time signal generator, is characterized in that, comprises frequency module, time module, time reference module, output control module and output module;
Described frequency module and described time module all with described time reference model calling; Described frequency module is used for providing reference oscillating frequency to described time reference module; Described time module is used for described time reference module with time information; Described time reference module is according to reference oscillating frequency and temporal information generation time benchmark;
Described time reference module is all connected with described output control module with described output module; Described time reference module is used for the time reference of generation to send to described output control module; Described output control module is used for the time reference received to be converted to dissimilar time signal, and this time signal is exported by described output module.
2. time signal generator according to claim 1, it is characterized in that, this time signal generator also comprises judge module, this judge module is connected with described output control module, for judging the type of equipment under test time signal, and the time signal type information of equipment under test is sent to described output control module, described output control module is according to the time signal type information of the equipment under test received, determine the type of the time signal exported, corresponding with the time signal of the time signal with equipment under test that make output.
3. time signal generator according to claim 1 and 2, is characterized in that, also comprises display module, and this display module is connected with described output control module, for showing the information of described output control module.
4. time signal generator according to claim 3, is characterized in that, described display module is LCD.
5. time signal generator according to claim 1 and 2, is characterized in that, described time module is GPS transceiver.
6. time signal generator according to claim 1 and 2, is characterized in that, described time module is BDS transceiver.
7. time signal generator according to claim 1 and 2, is characterized in that, described frequency module is caesium clock.
8. time signal generator according to claim 1 and 2, is characterized in that, described dissimilar time signal is IRIG-B time signal, 1PPS+TOD time signal, PTP time signal or NTP time signal.
9. one kind comprises the time tester of the time signal generator according to any one of claim 1-8, it is characterized in that, the test module of this time tester is connected with the output module of described time signal generator, dissimilar time signal is sent to described test module by described output module, and this test module measures the time deviation of Devices to test according to the time signal received.
10. time tester according to claim 9, is characterized in that, described Devices to test is time and frequency measurement device, B code output device or 4G device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935394A (en) * | 2015-06-26 | 2015-09-23 | 上海市计量测试技术研究院 | Time signal generator and time tester |
| CN106788841A (en) * | 2016-11-30 | 2017-05-31 | 电信科学技术第五研究所 | Synchronous net on-line monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935394A (en) * | 2015-06-26 | 2015-09-23 | 上海市计量测试技术研究院 | Time signal generator and time tester |
| CN106788841A (en) * | 2016-11-30 | 2017-05-31 | 电信科学技术第五研究所 | Synchronous net on-line monitoring system |
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Effective date of registration: 20171219 Address after: 201203 Jingan District, Changle Road, No. 1226, Co-patentee after: Shanghai Dongtu vision Industrial Technology Co. Ltd. Patentee after: Shanghai Institute of Measurement and Testing Technology Address before: 201203 Jingan District, Changle Road, No. 1226, Co-patentee before: Shanghai DIGIGRID Intelligent Technology Co., Ltd. Patentee before: Shanghai Institute of Measurement and Testing Technology |