CN215932100U - Double-synchronization geodetic network diversion flow measurement system based on satellite and wireless time service - Google Patents
Double-synchronization geodetic network diversion flow measurement system based on satellite and wireless time service Download PDFInfo
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Abstract
The utility model relates to a shunt vector testing system of a large-scale grounding grid of a power plant and a transformer substation in a power system, in particular to a double-synchronization geodetic network shunt flow measurement system based on satellite and wireless time service. The utility model comprises a transmitting system, a receiving system, a paying-off system and a moving vehicle, wherein the transmitting system and the receiving system are connected with the paying-off system, the transmitting system is arranged on the moving vehicle, the moving vehicle comprises a vehicle body, a turnover cover, a push rod and wheels, the transmitting system is arranged on the vehicle body, the turnover cover and the push rod are arranged on the upper part of the vehicle body, the turnover cover and the push rod are respectively positioned on two sides of the vehicle body, and the wheels are arranged on the lower part of the vehicle body. The satellite time service synchronization mode and the wireless time service synchronization mode can be freely switched, the problem that equipment cannot be normally used due to satellite signal failure is solved, and the measurement of the geodetic network shunt vector can be completed through the wireless time service synchronization mode under the condition that the satellite signal fails.
Description
Technical Field
The utility model relates to a shunt vector testing system of a large-scale grounding grid of a power plant and a transformer substation in a power system, in particular to a double-synchronization geodetic network shunt flow measurement system based on satellite and wireless time service.
Background
The power plant and the transformer substation are the most important components of the power system, and the grounding grid of the power plant and the transformer substation is an important measure for the safe operation of the power system, on one hand, the grounding grid is the working requirement for the stable operation of the power system and provides a common reference ground for various electrical equipment; on the other hand, when a short circuit fault or lightning strike occurs to the power system, the fault current can be quickly and effectively discharged, the ground potential distribution of the ground grid and the ground surface of the field area is improved, and the personal safety of workers in the related area and the safety of various electrical equipment are protected.
In the process of testing the impedance of the grounding network, due to the access of the overhead ground wire and the cables grounded at the two ends of the metal shield, a part of test current is shunted to the grounding device of the line tower and the remote grounding network through the overhead ground wire and the cable shield layer, and if the part of shunting is ignored, the test value of the grounding impedance is far less than the actual value easily. In order to ensure that the numerical judgment of the grounding impedance is more accurate, the total-station shunt coefficient must be measured and calculated so as to correct the grounding impedance and ensure the operation safety of the transformer substation grounding grid.
The national energy agency publishes a new standard of the power industry, namely' grounding device characteristic parameter measurement guide rule DL/T475-: for a transformer substation with an overhead lightning conductor and a cable outgoing line with two grounded ends of a metal shield, a line tower grounding device and a remote grounding grid shunt test current, and the grounding impedance test of the grounding device is greatly influenced, so that the shunt test of the overhead lightning conductor and the metal shield layer of the cable is required to be performed.
The synchronous signal of the existing shunt vector measurement system uses single satellite time service synchronization, and data interaction is realized by using a wireless radio frequency transmission (or mobile network) mode. The specific implementation mode is as follows:
the system consists of a host machine and a shunt measurement unit slave machine, wherein the host machine sends a test command and a start time to the shunt measurement unit through a wireless radio frequency module (or a mobile network), then the host machine and the shunt measurement unit respectively receive respective time data and a second pulse rising edge through respective satellite receiving modules, the host machine and the shunt measurement unit respectively start respective data acquisition modules to start data acquisition by using the second pulse rising edge after the appointed test start time is reached, the host machine receives shunt current amplitude and phase information of the shunt measurement unit through the wireless radio frequency module (or the mobile network) after the data acquisition is completed, and compares the amplitude and the phase with the test total current injected into a ground network to further obtain the amplitude and the phase of a shunt vector of the test point.
The data acquisition module of the shunt vector measurement system is completely started by depending on the rising edge of a single pulse per second, is designed on the premise that satellite signals cannot fail, and once the satellite signals are unstable or fail, the test system cannot work normally.
In summary, the synchronization signal of the conventional shunt vector measurement system uses a single satellite time service synchronization, the data acquisition module of the system is completely started by the rising edge of a single pulse per second, and various severe weather and strong electromagnetic interference (or some other factors) may make the satellite signal unstable or invalid, which eventually results in that the shunt vector measurement cannot be performed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides the double-synchronization geodetic network time sharing flow measurement system based on the satellite and the wireless time service, which has reasonable structural design, can freely switch the satellite time service synchronization mode and the wireless time service synchronization mode, avoids the problem that equipment cannot be normally used due to satellite signal failure, and can complete the measurement of geodetic network flow sharing vectors through the wireless time service synchronization mode under the condition of satellite signal failure.
The technical scheme adopted by the utility model for solving the problems is as follows: this two synchronous geonet minute flow measurement system based on satellite and wireless time service, its structural feature lies in: including transmitting system, receiving system, unwrapping wire system and locomotive, transmitting system and receiving system all are connected with unwrapping wire system, transmitting system installs on the locomotive, the locomotive includes automobile body, flip, push rod and wheel, transmitting system installs on the automobile body, flip and push rod are all installed on the upper portion of automobile body and flip and push rod are located the both sides of automobile body respectively, the lower part at the automobile body is installed to the wheel.
Furthermore, the transmitting system comprises a transmitting satellite time service module, a wireless radio frequency module, a keyboard, a liquid crystal display screen, a CPU processing unit, a voltage and current signal sampling unit, a variable frequency power supply and an isolation transformer, wherein the transmitting satellite time service module, the wireless radio frequency module, the keyboard and the liquid crystal display screen are all connected with the CPU processing unit, the variable frequency power supply and the isolation transformer are sequentially connected, and the voltage and the current output by the isolation transformer are connected with the CPU processing unit through the voltage and current signal sampling unit.
Further, the transmitting system also comprises a printer, and the printer is connected with the CPU processing unit.
Furthermore, the receiving system comprises a current sampling module, an amplifying and integrating module, a filtering module, a synchronous sampling module, a frequency selection processing module, a delay correction module, a display unit, a satellite receiving time service module, a wireless time service module and a delay calculation module, wherein the current sampling module, the amplifying and integrating module, the filtering module, the synchronous sampling module, the frequency selection processing module, the delay correction module and the display unit are sequentially connected, the satellite receiving time service module and the wireless time service module are connected to the synchronous sampling module, and the wireless time service module, the delay calculation module and the delay correction module are sequentially connected.
Further, the current sampling module is a current clamp or a rogowski coil.
Furthermore, the isolation transformer is installed on the lower portion of the vehicle body, the variable frequency power supply is installed in the middle of the vehicle body, and the transmitting satellite time service module, the wireless radio frequency module, the keyboard, the liquid crystal display screen, the voltage and current signal sampling unit and the printer are all installed on the upper portion of the vehicle body.
Furthermore, the turnover cover is a frame body which is in an L-shaped structure, and the push rod is obliquely arranged.
Compared with the prior art, the utility model has the following advantages:
(1) the problem that an existing shunt vector measurement system cannot work normally under the condition that satellite signals are invalid is solved, the double-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service is provided, the wireless time service synchronization working mode can be switched to when the satellite signals are invalid, and normal use of equipment is guaranteed.
(2) The introduction of wireless time service synchronization is inevitably influenced by data sending software delay, circuit level conversion delay, wireless transmission space delay, data receiving software delay and the like, and each delay time is not fixed, so that the phase error of a measured shunt vector is large, and the accuracy of measurement is influenced. According to the method, a synchronous delay correction link is added in the wireless time service synchronous measurement system, and the time delay of the wireless signals is corrected in real time, so that the synchronous precision is close to the satellite time service synchronization, and the phase measurement error is greatly reduced.
(3) The host computer provides the selection of satellite and wireless synchronization mode, sends the synchronization mode to the reposition of redundant personnel measuring unit through wireless, and host computer and reposition of redundant personnel measuring unit carry out work according to the well synchronization mode of agreeing, can switch to wireless synchronization measurement mode when satellite positioning is difficult, and wireless synchronization mode also can switch to satellite synchronization mode, has solved the problem that can't measure under the satellite positioning difficulty condition, and reliability and application scope improve greatly.
(5) The wireless communication of the host computer is in a broadcasting mode, and the simultaneous measurement of a plurality of shunting units can be realized.
(6) Two synchronous measurement modes share one hardware circuit, and only software algorithms are different, so that the cost is greatly reduced.
Drawings
Fig. 1 is a schematic connection diagram of a dual-synchronization geodetic network partial flow measurement system according to an embodiment of the present invention.
Fig. 2 is a schematic connection diagram of a transmitting system according to an embodiment of the present invention.
FIG. 3 is a schematic connection diagram of a pay-off system according to an embodiment of the present invention.
Fig. 4 is a schematic view of the installation structure of the transmitting system of the embodiment of the present invention.
In the figure: a transmitting system 1, a receiving system 2, a paying-off system 3, a moving vehicle 4,
A satellite-transmitting time service module 11, a wireless radio frequency module 12, a keyboard 13, a liquid crystal display 14, a CPU processing unit 15, a voltage and current signal sampling unit 16, a variable frequency power supply 17, an isolation transformer 18, a printer 19,
A current sampling module 21, an amplification and integration module 22, a filtering module 23, a synchronous sampling module 24, a frequency selection processing module 25, a delay correction module 26, a display unit 27, a satellite receiving time service module 28, a wireless time service module 29, a delay calculation module 210,
A vehicle body 41, a flip cover 42, a push rod 43 and wheels 44.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 4, it should be understood that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical essence, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the present invention without affecting the functions and the achievable objectives of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
The double-synchronization geodetic network partial flow measurement system based on satellite and wireless time service in the embodiment comprises a transmitting system 1, a receiving system 2, a pay-off system 3 and a moving vehicle 4, wherein the transmitting system 1 and the receiving system 2 are connected with the pay-off system 3, and the transmitting system 1 is installed on the moving vehicle 4.
The moving vehicle 4 in the present embodiment includes a vehicle body 41, a flip 42, a push rod 43, and wheels 44, the transmitting system 1 is mounted on the vehicle body 41, the flip 42 and the push rod 43 are both mounted on the upper portion of the vehicle body 41, the flip 42 and the push rod 43 are respectively located on both sides of the vehicle body 41, and the wheels 44 are mounted on the lower portion of the vehicle body 41.
The transmitting system 1 in this embodiment includes a transmitting satellite time service module 11, a wireless radio frequency module 12, a keyboard 13, a liquid crystal display 14, a CPU processing unit 15, a voltage and current signal sampling unit 16, a variable frequency power supply 17, an isolation transformer 18 and a printer 19, where the transmitting satellite time service module 11, the wireless radio frequency module 12, the keyboard 13, the liquid crystal display 14 and the printer 19 are all connected with the CPU processing unit 15, the variable frequency power supply 17 and the isolation transformer 18 are sequentially connected, and the voltage and the current output by the isolation transformer 18 are connected with the CPU processing unit 15 through the voltage and current signal sampling unit 16.
The receiving system 2 in this embodiment includes a current sampling module 21, an amplifying and integrating module 22, a filtering module 23, a synchronous sampling module 24, a frequency selection processing module 25, a delay correction module 26, a display unit 27, a satellite time service receiving module 28, a wireless time service module 29 and a delay calculation module 210, where the current sampling module 21 is a current clamp or a rogowski coil, the current sampling module 21, the amplifying and integrating module 22, the filtering module 23, the synchronous sampling module 24, the frequency selection processing module 25, the delay correction module 26 and the display unit 27 are sequentially connected, the satellite time service receiving module 28 and the wireless time service module 29 are connected to the synchronous sampling module 24, and the wireless time service module 29, the delay calculation module 210 and the delay correction module 26 are sequentially connected.
The isolation transformer 18 in the embodiment is installed at the lower part of the vehicle body 41, the variable frequency power supply 17 is installed at the middle part of the vehicle body 41, and the transmitting satellite time service module 11, the wireless radio frequency module 12, the keyboard 13, the liquid crystal display 14, the voltage and current signal sampling unit 16 and the printer 19 are all installed at the upper part of the vehicle body 41; the flip 42 is a frame body having an L-shaped structure, and the push rod 43 is disposed obliquely.
Specifically, the satellite and wireless time service synchronization mode can be freely selected through a host menu, and a specific embodiment will be described below.
As shown In fig. 1, a transmitting system 1 injects 40Hz to 70Hz pilot frequency current (not 50Hz, such as 45 Hz) Im into a ground grid, a part of the total current Im injected into the ground grid is shunted to a remote ground grid by devices such as a tower framework, a cable shielding layer, an optical fiber cable shielding layer, and the like, and a receiving system 2 collects shunt currents I1 and I2 … … In of each shunt branch through a current sampling module 21, wherein the current of each shunt branch may be measured by an infinite number of receiving systems 2 at multiple points at the same time, or by one receiving system 2 at multiple points.
As shown in fig. 2, a CPU processing unit 15 of the transmitting system 1 is connected to a transmitting satellite time service module 11, a wireless radio frequency module 12, a keyboard 13, and a liquid crystal display 14, the connected transmitting satellite time service module 11 is used to receive a pulse per second signal for synchronous AD sampling and collect a main current Im injected into the earth grid, the wireless radio frequency module 12 is used to send data in a broadcast manner, the operating frequency of the wireless radio frequency module 12 is 433MHz, the keyboard 13 is used to control menu operation, the liquid crystal display 14 is used to display data parameters and control menus, the CPU processing unit 15 is connected to a variable frequency power supply 17 and an isolation transformer 18 in sequence, the variable frequency power supply 17 is controlled by the CPU processing unit 15 to receive control commands such as frequency, voltage, and current, 40 to 70Hz power signal output by the variable frequency power supply 17 is subjected to impedance conversion by the isolation transformer 18 to output a voltage signal of 0 to 800V or a current signal of 0 to 30A, the output of the variable frequency power supply 17 is sent to the CPU processing unit 15 through the voltage current signal sampling unit 16 for displaying the output parameters and synchronously sampling the output current.
As shown in FIG. 3, the current signal sampled by the current sampling module 21 of the receiving system 2 using the current clamp or Rogowski coil enters the synchronous sampling module 24 after passing through the amplifying and integrating module 22 and the filtering module 23, the wireless time service module 29 receives the signal of the transmitting system 1 in the synchronous mode (satellite time service or wireless time service) and sends the signal to the synchronous sampling module 24, the synchronous sampling module 24 selects satellite time service or wireless time service according to the synchronous mode, the sampled data enters the delay correction module 26 through the frequency selection processing module 25, the delay correction module 26 performs correction according to the calculated value of the wireless signal transmission time delay calculation module 210, the delay correction module 26 does not perform time delay correction when receiving the synchronous measurement of the satellite time service module 28, the signal after delay correction is sent to the display unit 27 to calculate and display the amplitude and phase of the shunt vector, and the shunt vector coefficient of multiple data can be automatically calculated on the receiving system 2, Split vector sum, actual divergence vector.
The specific method for using the satellite time service synchronization mode is as follows:
after receiving a second pulse signal of a transmitting satellite time service module 11, a transmitting system 1 in fig. 1 sends a sampling preparation signal containing amplitude and phase information of a last sampling current in a broadcasting manner through a wireless radio frequency module 12 at a rising edge time of a second pulse, and appoints to start AD sampling at a rising edge arrival time of a next second pulse, a receiving system 2 in fig. 1 receives the sampling preparation signal, calculates the amplitude and the phase of a shunt vector by taking the current amplitude and the phase of the transmitting system 1 as references in combination with the current amplitude and the phase of the last measurement of the receiving system 2, and simultaneously waits for the arrival of a next second pulse rising edge, namely a real synchronous signal, the transmitting system 1 and the receiving system 2 start current sampling at the same time after the arrival of the next second pulse rising edge, and sampling data after the sampling is finished obtains a required measurement signal through a frequency selection processing module 25 in fig. 3, the measurement signal is calculated and displayed by the display unit 27 of fig. 3 for the magnitude and phase of the split vector, and so on.
The wireless time service synchronization mode is specifically as follows:
the transmitting system 1 of fig. 1 transmits a sampling preparation signal containing the amplitude and phase information of the last sampling current in a broadcasting manner through the wireless radio frequency module 12, the receiving system 2 of fig. 1 calculates the amplitude and phase of a shunt vector by combining the current amplitude and phase of the transmitting system 1 with the current amplitude and phase of the shunt measurement unit measured last time as reference after receiving the sampling preparation signal, meanwhile, the delay calculation module 210 of fig. 3 calculates the signal transmission delay time according to the wireless signal, the delay correction module 26 of fig. 3 corrects the measurement phase according to the delay time, the transmitting system 1 transmits a synchronous sampling signal through the wireless radio frequency module 12 after the sampling preparation signal is transmitted, the transmitting system 1 and the receiving system 2 start sampling, and the influence of the wireless signal transmission delay on the synchronous delay is greatly counteracted after the shunt signal is corrected by the time delay, therefore, the phase measurement precision is improved, after sampling is finished, the sampling data is processed by the frequency selection processing module 25 of fig. 3 to obtain a required measurement signal, the measurement signal is calculated and displayed by the display unit 27 of fig. 3 to obtain the amplitude and the phase of the shunt vector, and the process is repeated in this way and automatically circulated.
In this application, transmitting system 1 contains satellite time service synchronization mode and wireless time service synchronization mode, two kinds of modes can freely switch in real time, transmitting satellite time service module 11 and wireless radio frequency module 12 have been connected simultaneously to transmitting system 1's CPU processing unit 15, transmitting system 1's wireless radio frequency module 12 communication is the broadcasting mode, wireless radio frequency module 12's transmitting frequency is 433MHz, satellite time service module 11 includes but not limited to GPS time service module, big dipper time service module or GPS big dipper bimodulus time service module, transmitting system 1's output frequency is 40Hz ~ 70Hz, transmitting system 1's output voltage is 0 ~ 800V, transmitting system 1's output current is 0 ~ 30A.
In the application, the receiving system 2 includes a wireless signal transmission time delay calculation and delay correction link, the receiving system 2 can automatically calculate the shunt coefficients, the shunt vectors and the actual shunt vectors of a plurality of pieces of data, the current sampling module 21 includes a current clamp or a rogowski coil, the delay calculation can be the wireless signal delay time real-time calculation, the delay calculation also includes a delay time preset fixed value, the perimeter of the rogowski coil is 1-3 m
In the present application, the measurement system may be connected to an infinite number of receiving systems 2 for multipoint simultaneous testing, or a single receiving system 2 may be used for point-by-point testing.
In this application, wireless signal transmission can lead to time delay problem when having the building to shelter from owing to the distance far and near or to the wireless time service synchronization mode measurement inevitable can lead to measuring angle error, and this application has added wireless signal transmission time delay in the loop and has calculated and delay correction link, and real-time correction delay time has reduced the influence of time delay to the measuring result greatly, has improved the phase place measurement accuracy.
In this application, because weather conditions (rainy day or cloud layer are thicker) or other uncontrollable factors may lead to the satellite positioning difficulty to bring the problem of unable measurement, this application provides the two synchronization mode selections of satellite and wireless time service, send synchronization mode to receiving system 2 through wireless, transmitting system 1 and receiving system 2 carry out work according to the synchronization mode of agreeing well, can switch to wireless synchronization measurement mode when satellite positioning difficulty, wireless synchronization mode also can switch to satellite synchronization mode, application scope and reliability improve greatly.
In this application, this application transmitting system 1 wireless communication is the broadcast mode, can realize that infinitely a plurality of shunting units measure simultaneously.
In the application, two synchronous measurement modes share one hardware circuit, and only software algorithms are different, so that the hardware cost is greatly reduced.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the utility model are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims.
Claims (7)
1. The utility model provides a two synchronous geodetic network reposition of redundant personnel vector measurement systems based on satellite and wireless time service which characterized in that: including transmitting system (1), receiving system (2), unwrapping wire system (3) and locomotive (4), transmitting system (1) and receiving system (2) all are connected with unwrapping wire system (3), transmitting system (1) is installed on locomotive (4), locomotive (4) are including automobile body (41), flip (42), push rod (43) and wheel (44), transmitting system (1) is installed on automobile body (41), flip (42) and push rod (43) are all installed on the upper portion of automobile body (41) and flip (42) and push rod (43) are located the both sides of automobile body (41) respectively, the lower part at automobile body (41) is installed in wheel (44).
2. The double-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 1, wherein: the transmitting system (1) comprises a transmitting satellite time service module (11), a wireless radio frequency module (12), a keyboard (13), a liquid crystal display screen (14), a CPU processing unit (15), a voltage and current signal sampling unit (16), a variable frequency power supply (17) and an isolation transformer (18), wherein the transmitting satellite time service module (11), the wireless radio frequency module (12), the keyboard (13) and the liquid crystal display screen (14) are all connected with the CPU processing unit (15), the variable frequency power supply (17) and the isolation transformer (18) are sequentially connected, and voltage and current output by the isolation transformer (18) are connected with the CPU processing unit (15) through the voltage and current signal sampling unit (16).
3. The dual-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 2, wherein: the transmitting system (1) further comprises a printer (19), and the printer (19) is connected with the CPU processing unit (15).
4. The double-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 1, wherein: the receiving system (2) comprises a current sampling module (21), an amplification integral module (22), a filtering module (23), a synchronous sampling module (24), a frequency selection processing module (25), a delay correction module (26), a display unit (27), a satellite receiving time service module (28), a wireless time service module (29) and a delay calculation module (210), wherein the current sampling module (21), the amplification integral module (22), the filtering module (23), the synchronous sampling module (24), the frequency selection processing module (25), the delay correction module (26) and the display unit (27) are sequentially connected, the satellite receiving time service module (28) and the wireless time service module (29) are connected to the synchronous sampling module (24), and the wireless time service module (29), the delay calculation module (210) and the delay correction module (26) are sequentially connected.
5. The dual-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 4, wherein: the current sampling module (21) is a current clamp or a Rogowski coil.
6. The dual-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 3, wherein: the isolation transformer (18) is installed on the lower portion of the vehicle body (41), the variable frequency power supply (17) is installed in the middle of the vehicle body (41), and the transmitting satellite time service module (11), the wireless radio frequency module (12), the keyboard (13), the liquid crystal display screen (14), the voltage and current signal sampling unit (16) and the printer (19) are all installed on the upper portion of the vehicle body (41).
7. The double-synchronization geodetic network shunt vector measurement system based on satellite and wireless time service as claimed in claim 1, wherein: the flip cover (42) is a frame body arranged in an L-shaped structure, and the push rod (43) is obliquely arranged.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660346A (en) * | 2022-03-18 | 2022-06-24 | 武汉大学 | Shunt vector measurement device and method based on Beidou time service and crystal oscillator clock |
| CN114660346B (en) * | 2022-03-18 | 2024-07-30 | 武汉大学 | Shunt vector measurement equipment and method based on Beidou time service and crystal oscillator clock |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660346A (en) * | 2022-03-18 | 2022-06-24 | 武汉大学 | Shunt vector measurement device and method based on Beidou time service and crystal oscillator clock |
| CN114660346B (en) * | 2022-03-18 | 2024-07-30 | 武汉大学 | Shunt vector measurement equipment and method based on Beidou time service and crystal oscillator clock |
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