CN218213807U - Multi-path clock taming and calibrating equipment - Google Patents
Multi-path clock taming and calibrating equipment Download PDFInfo
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- CN218213807U CN218213807U CN202221947402.9U CN202221947402U CN218213807U CN 218213807 U CN218213807 U CN 218213807U CN 202221947402 U CN202221947402 U CN 202221947402U CN 218213807 U CN218213807 U CN 218213807U
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Abstract
The utility model discloses a calibration equipment is tamed and obeyed to multichannel clock, including main control chip, communication module, power supply system and single track from holding formula equipment, the PPS coaxial cable input links to each other with the single track from holding formula equipment through many minutes door switches and connector, and communication module and many minutes door switches all link to each other with main control chip, and main control chip is used for controlling the break-make of many minutes door switches. The PPS signals are sent to all the single-channel self-contained node recorders, and when the PPS signals are acclimated, triggered, timed or objected to the PPS signals, the number of the equipment can be expanded in a cascade mode, and the PPS signals can be used for realizing the functions of the PPS signalsTo ensure high-precision synchronization among a plurality of devices; the time precision can reach 10e through the tame calibration equipment ‑12 And when the clock disciplines the calibration equipment for time synchronization and object rejection, the batch self-contained equipment synchronization and time calibration are quickly completed, and the self-contained equipment synchronization precision and the working efficiency are effectively improved.
Description
Technical Field
The utility model relates to an ocean exploration equipment technical field, concretely relates to calibration equipment is tamed to multichannel clock.
Background
The common self-contained acquisition equipment (carrying atomic clock) in ocean exploration is required, because of the higher requirement of the existing ocean acquisition, a plurality of sets of self-contained acquisition equipment are required to form an array for simultaneously acquiring, and the plurality of sets of self-contained acquisition equipment are required to form the array for acquiring, the plurality of sets of equipment are required to have high synchronism, wherein the atomic clock is tamed, the PPS time synchronization, the PPS reverse time synchronization and the PPS triggering all need to send synchronous square wave signals into the plurality of self-contained acquisition equipment through coaxial cables, and a plurality of clock tamed calibration equipment is required to be used here, so that high-precision time synchronization is realized.
In order to achieve high-precision time synchronization, the same time node (for example, the rising edge of a square wave signal) is sent to a plurality of devices, and then the plurality of devices perform various operations with high synchronization requirements according to command requirements. To solve the problem of high-precision synchronization, it is necessary to reduce nodes for transmitting synchronization signals and select devices with small output deviation. For a single self-contained collection device, the concept of the time difference is the difference between the internal time of the device and the UTC time, but when a plurality of devices operate together, there is a time difference between the devices in addition to the difference between the internal time of the device and the UTC time, and in order to reduce the accuracy of data inversion and calculation, the synchronization between the devices and the UTC time and the synchronization between the devices need to be further improved.
The highest precision of the common crystal oscillator can only reach 10e -9 Grade, which means that the maximum time deviation of acquisition for one month is 3ms at most, that is, two different acquisition devices may be 100 points different at a sampling rate of 100kHz, and at this time, the data accuracy is greatly reduced; the precision of the atomic clock can reach 10e after tame (PPS) -12 The grade, namely the difference of at most 0.1 point between two different acquisition devices under the sampling rate of 100kHz, means that all point positions of data acquired by the two devices can be correctly aligned, the data accuracy is improved, and the reliability is increased.
After the design of the atomic clock is adopted, in order to simultaneously discipline a plurality of sets of equipment, a set of high-precision disciplined equipment is needed, besides, time calibration needs to be achieved by more than one minute, and the conventional clock disciplined calibration equipment cannot meet the requirements of disciplining and time synchronization of the plurality of sets of equipment.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve prior art and can not satisfy taming and time synchronization problem of many sets of equipment, provide a multichannel clock tames calibration equipment to the synchronous relation that the hope improves a plurality of equipment arrives data aftertreatment effect and target location's accuracy.
The utility model discloses a technical scheme who adopts following realizes: a multi-channel clock discipline calibration device comprises a main control chip, a communication module, a power supply system and a single-channel self-contained device; the PPS coaxial cable input interface is connected with the single-channel self-contained equipment through a multi-split door switch and a connector, the communication module and the multi-split door switch are connected with a main control chip, and the main control chip is used for controlling the on-off of the multi-split door switch; the PPS coaxial cable input interface is the input of an atomic clock source with high precision when an atomic clock is tamed.
Furthermore, the multi-tap switch adopts 74LVC245, a gate switch chip is opened through the control of a main control chip and is connected to a plurality of 10xMCX connectors, meanwhile, a single PPS coaxial cable output is arranged through the 10xMCX connectors and is used for cascading multi-path clock taming calibration equipment, and more single-path self-contained acquisition equipment is synchronized after the cascading.
Furthermore, the calibration equipment also comprises a GPS antenna interface connected with the main control chip, the GPS antenna interface is used as a standby scheme, and if a PPS signal with higher precision does not exist, the PPS pulse input can be provided through an external GPS.
Furthermore, the communication module adopts a WIFI module, interacts with the main control device through WIFI, receives and executes a control command, and uploads state information.
Furthermore, the power supply system adopts double-path power supply to provide power support for other modules.
Compared with the prior art, the utility model discloses an advantage lies in with positive effect:
the multi-path clock discipline calibration equipment provided by the scheme transmits PPS signals to all single-path self-contained node recorders through multi-tap switch design, and can perform discipline, trigger, time synchronization or deprecation on the PPS signals, and simultaneously can perform cascade expansion on the number of the equipment, so that high-precision synchronization among a plurality of equipment can be ensured; the time precision can reach 10e through the tame calibration equipment -12 And when the clock disciplines the calibration equipment for time synchronization and object rejection, the batch self-contained equipment synchronization and time calibration are quickly completed, and the self-contained equipment synchronization precision and the working efficiency are effectively improved.
Drawings
Fig. 1 is a schematic block diagram of a multi-clock disciplined calibration apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the principle of the multi-door switch according to the embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further explained with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, for the multi-channel clock taming calibration device of the present invention, the overall structure diagram includes a main control chip, a communication module, a power supply system and a single-channel self-contained device, the PPS coaxial cable input is connected to the single-channel self-contained device through a multi-tap switch and a connector, the communication module and the multi-tap switch are both connected to the main control chip, the main control chip is used to control the on-off of the multi-tap switch, and the power supply system adopts two-way power supply to provide power support for other modules; the 5V2A adapter can be used as power input, and a built-in rechargeable lithium battery can be used for supplying power, so that the solar energy collector is convenient to use outdoors. The main control chip is a control unit of the whole set of system, realizes signal correction, is responsible for functions of opening and closing a door switch chip and the like, and the communication module adopts a WIFI module, interacts with main control equipment (a computer or a mobile phone) through WIFI, receives and executes a control command, and uploads state information.
The PPS coaxial cable input interface is high-precision atomic clock source input during domestication of atomic clocks, three multi-split gate switch chips are connected with a connector in the embodiment and adopt 74LVC245, the three multi-split gate switch chips are opened under the control of a main control chip and connected to two 10xMCX connectors, and meanwhile, a single PPS coaxial cable output is used for cascading of multi-path clock domestication calibration equipment, and more single-path self-contained acquisition equipment can be synchronized after cascading;
in addition, the calibration equipment also comprises a GPS antenna interface connected with the main control chip, the GPS antenna interface is used as a standby scheme, if no high-precision PPS signal exists, PPS pulse input can be provided through an external GPS, and the GPS is used as a PPS receiving end.
With reference to fig. 1, in the present embodiment, 3 IDT74LVC245A is used as a high-speed multi-tap switch, the maximum input leakage current of the chip is 5 μ a, 24 input leakage currents of 3 chips are about 0.1mA, 20 of the 24 output paths are connected to two 10 × MCX connectors, and one path is used for PPS output (coaxial cable). As shown in fig. 2, which is a schematic diagram of the high-speed multi-tap switching principle, the most important parameter of the multi-clock disciplined calibration device is synchronization performance, the input deviation after input parallel is 0, and no large deviation exists even in the case of multi-stage device cascade.
In this embodiment, a single multi-way clock synchronizer can connect two and a tenth MCX coaxial cable connection lines, that is, each multi-way clock synchronizer can connect 20 sets of equipment, and when more than 20 sets of equipment need to be synchronized or tamed, a plurality of multi-way clock synchronizers can be cascaded.
The WIFI is used for communicating command issuing and state uploading of the multi-channel clock disciplining and calibrating equipment and the self-contained acquisition equipment, and the multi-channel clock disciplining and calibrating equipment is connected with a main control device (a computer or a mobile phone) through the WIFI and used for controlling the release of PPS signals. When the atomic clocks of a plurality of self-contained acquisition devices need to be tamed, PPS signals output by a clock source of the atomic clock with higher precision are input into the multi-path clock taming calibration device as 1 path, and are distributed out by 20 paths through a high-speed gate circuit after receiving a taming command for taming the atomic clocks; when a plurality of sets of self-contained acquisition equipment are required to synchronously trigger, time tick and object, the multi-channel clock taming calibration equipment receives a command and then issues PPS trigger pulses according to requirements.
The real-time signals are directly sent/received through WIFI, the high accuracy of time cannot be guaranteed, and the maximum accuracy can only reach millisecond accuracy; the PPS pair sends time information to a plurality of self-contained acquisition equipment through a plurality of paths of clock discipline calibration equipment at first, a trigger signal is sent to each self-contained acquisition equipment through a high-speed multi-tap switch of the multi-path clock discipline calibration equipment after waiting for 5s, the acquisition equipment starts timing with the time of the calibration time plus 5s, and the time synchronization precision can reach nanosecond level at the moment; PPS opposites records the current time of all acquisition devices into the memory card at the same time for calibration compensation in processing the data.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A multi-channel clock discipline calibration device is characterized by comprising a main control chip, a communication module, a power supply system and a single-channel self-contained device; the PPS coaxial cable input interface is connected with the single-channel self-contained equipment through a multi-split door switch and a connector, the communication module and the multi-split door switch are connected with a main control chip, and the main control chip is used for controlling the on-off of the multi-split door switch; the PPS coaxial cable input interface is used for inputting a high-precision atomic clock source when an atomic clock is tamed.
2. The multi-way clock-disciplining calibration apparatus as recited in claim 1, wherein: the multi-branch gate switch adopts 74LVC245, a gate switch chip is opened through the control of a main control chip and is connected to a plurality of connectors, and meanwhile, a single path of PPS coaxial cable output is used for cascading of multi-path clock taming calibration equipment through the connectors.
3. The multi-way clock disciplined calibration apparatus of claim 1, characterized in that: the calibration equipment further comprises a GPS antenna interface connected with the main control chip, and is connected with an external GPS module through the GPS antenna interface.
4. The multi-way clock disciplined calibration apparatus of claim 1, characterized in that: the communication module adopts a WIFI module, interacts with the main control equipment through WIFI, receives and executes a control command and uploads state information.
5. The multi-way clock disciplined calibration apparatus of claim 1, characterized in that: the power supply system adopts double-circuit power supply and is used for providing power supply support for other modules.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221947402.9U CN218213807U (en) | 2022-07-27 | 2022-07-27 | Multi-path clock taming and calibrating equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221947402.9U CN218213807U (en) | 2022-07-27 | 2022-07-27 | Multi-path clock taming and calibrating equipment |
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| CN218213807U true CN218213807U (en) | 2023-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115291495A (en) * | 2022-07-27 | 2022-11-04 | 青岛海洋地质研究所 | Multi-channel clock taming calibration device based on self-contained acquisition equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115291495A (en) * | 2022-07-27 | 2022-11-04 | 青岛海洋地质研究所 | Multi-channel clock taming calibration device based on self-contained acquisition equipment |
| CN115291495B (en) * | 2022-07-27 | 2024-04-02 | 青岛海洋地质研究所 | Multipath clock tame calibrating device based on self-contained acquisition equipment |
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