CN102932085A - Time synchronization method of observation instrument of ocean bottom observatory network - Google Patents
Time synchronization method of observation instrument of ocean bottom observatory network Download PDFInfo
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- CN102932085A CN102932085A CN2012104432128A CN201210443212A CN102932085A CN 102932085 A CN102932085 A CN 102932085A CN 2012104432128 A CN2012104432128 A CN 2012104432128A CN 201210443212 A CN201210443212 A CN 201210443212A CN 102932085 A CN102932085 A CN 102932085A
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Abstract
The invention discloses a time synchronization method of an observation instrument of ocean bottom observatory network and the synchronization method based on network time protocol (NTP) and picture transfer protocol (PTP) technology. An NTP synchronization signal and a PTP synchronization signal which are output by a primary connecting junction box are input to a second-layer switchboard of a secondary connecting junction box. The PTP synchronization signal which is output by the second-layer switchboard is received by PTP from a clock and decodes and outputs a P2P-streaming (PPS) signal. The signal PPS signal conducts quantative allocation and power amplification by a PPS distribution amplifier. The PPS signal, the NTP synchronization signal and the PTP synchronization signal are transmitted to the observation instrument through a cable. An inner circuit of the observation instrument isolates and amplifies the PPS signal so as to achieve driving capability. Meanwhile, the NTP synchronization signal or the PTP synchronization signal are encoded and time synchronization is achieved. The time synchronization method of the observation instrument of the ocean bottom observatory network takes great importance to achieving accurate time of observation instrument such as a seismometer.
Description
Technical field
The present invention relates to a kind of method for synchronizing time of submarine observation network observation instrument, especially a kind of method for synchronizing time of the submarine observation network observation instrument based on NTP and PTP technology.
Background technology
Seabed observation network is the 3rd observation platform of earth system; crucial observation station in the observation platform namely is the diversified observation instrument of access submarine observation network; these observation instruments have very important effect to aspects such as scientific research of seas, resource exploration, environmental protection, disaster preventions; the various ambient signals that these observation instruments are collected give the precise time stamp, and corresponding data are processed and analysis significance is great for carrying out on land.
Can't fix up an aerial wire to receive gps satellite signal and Big Dipper satellite signal owing to be in the observation instrument in zone, deep-sea, therefore just time signal can only be transferred to the seabed from the bank base via optoelectronic composite cable, the remote high accuracy of the time signal that provides of time signal transmission requirement system, the variation of the time signal that diversified observation instrument requirement system provides.
Summary of the invention
The method for synchronizing time that the purpose of this invention is to provide a kind of submarine observation network observation instrument is to achieve a butt joint into the time synchronized of the observation instrument of submarine observation network.
For achieving the above object, the technical solution that the present invention intends adopting is:
Submarine observation network observation instrument method for synchronizing time of the present invention is a kind of method for synchronizing time based on NTP and PTP technology, may further comprise the steps:
(1) the NTP synchronizing signal of the PTN equipment of the main box of plugging into output and PTP synchronizing signal are through the Layer 2 switch of cable transmission to the inferior box of plugging into.
(2) Layer 2 switch is divided into the output of N+1 road with NTP synchronizing signal and the PTP synchronizing signal of input, N is positive integer, one road PTP synchronizing signal inputs to PTP from clock and decodedly goes out with the UTC time deviation after 200ns is with interior PPS signal, input to the PPS distribution amplifier of built-in crystal oscillator, all the other every roads, N road are exported NTP synchronizing signal and PTP synchronizing signal simultaneously;
(3) the PPS distribution amplifier is enlarged into M road PPS signal with the PPS signal distribution of input, and M is positive integer, M=N;
(4) the M road PPS signal of PPS distribution amplifier output is corresponding one by one with N road NTP synchronizing signal and the PTP synchronizing signal of Layer 2 switch output respectively, and by cable transmission to P observation instrument, P is positive integer, P=M=N;
(5) buffer circuit in each observation instrument carries out isolation processing to the PPS signal of input, input to the observation instrument main control unit after amplifying processing by amplifying circuit, carry out combined decoding realization time synchronized with NTP synchronizing signal or the PTP synchronizing signal of input observation instrument main control unit: when observation instrument is supported Network Time Protocol, then realize the Microsecond grade time synchronized by NTP synchronizing signal and the decoding of PPS combined signal; When observation instrument is supported IEEE1588 v2 agreement, then decode by the PTP synchronizing signal and realize the Microsecond grade time synchronized.
In the step of the present invention (1), the plug into PTN equipment of box and the Layer 2 switch of the box of time plugging into of said master all is web-transporting devices of supporting IEEE1588 v2 agreement, is operated in the pattern of boundary clock.
Among the present invention, the PPS distribution amplifier of built-in crystal oscillator can be kept time after the PTP synchronizing signal loses efficacy, and punctual precision is 5 * 10
-10/ day.
Among the present invention, said observation instrument is the equipment of the real-time online observation of access seabed observation network and data acquisition, such as seismic detector, sampler, thermohaline deep profile instrument, deep sea camera etc.
Above-mentioned PTP refers to adopt IEEE1588 v2 agreement and gps satellite signal or Big Dipper satellite signal to carry out the time server under the Slave pattern of being operated in of time synchronized from clock; The NTP synchronizing signal is the time synchronizing signal by the RFC1305 protocol definition; The PTP synchronizing signal is the time synchronizing signal by IEEE1588 v2 protocol definition; The PPS signal is to be the square-wave signal of 1s in a kind of cycle, and the rising edge of square-wave signal aligns at whole second with UTC Universal Time Coordinated (UTC) constantly, and error is in 200ns.
The invention has the beneficial effects as follows: in the method for synchronizing time of submarine observation network observation instrument of the present invention, in the inferior box of plugging into, from clock the PTP synchronizing signal output PPS signal of decoding is offered observation instrument by PTP, can increase the diversity of submarine observation network time signal; In the inferior box of plugging into PTP is distributed amplification from the PPS signal of clock output, realized that 1 road PPS signal expands to multichannel, observation instrument need not to carry out the decoding of PTP synchronizing signal again can obtain high accuracy PPS signal, can reduce the observation instrument cost; Observation instrument is isolated the amplification processing to the PPS signal that receives, and has improved PPS signal long-distance transmissions driving force afterwards.
Description of drawings
Fig. 1 is the clock synchronization system schematic diagram of submarine observation network observation instrument.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
With reference to Fig. 1, the method for synchronizing time of submarine observation network observation instrument may further comprise the steps:
(1) the NTP synchronizing signal of the PTN equipment of the main box of plugging into output and PTP synchronizing signal are through the Layer 2 switch of cable transmission to the inferior box of plugging into; Here, the PTN equipment of the main box of plugging into is the web-transporting device of supporting IEEE1588 v2 agreement, is operated in the pattern of transparent clock, and the queuing delay of PTP synchronizing signal in PTN calculated and compensate; The Layer 2 switch of the inferior box of plugging into is the Layer 2 switch of supporting IEEE1588 v2 agreement, is operated in the pattern of boundary clock.
(2) Layer 2 switch is divided into N+1 road (N=8 in the legend) output with NTP synchronizing signal and the PTP synchronizing signal of input, one road PTP synchronizing signal inputs to PTP from clock and decodedly goes out with the UTC time deviation after 200ns is with interior PPS signal, input to the PPS distribution amplifier of built-in crystal oscillator, all the other every roads, N road are exported NTP synchronizing signal and PTP synchronizing signal simultaneously;
The PPS distribution amplifier of built-in crystal oscillator can be kept time after the PTP synchronizing signal loses efficacy, and punctual precision is 5 * 10
-10/ day.
(3) the PPS distribution amplifier is enlarged into M road (M=8 in the legend) PPS signal with the PPS signal distribution of input;
(4) 8 road PPS signals of PPS distribution amplifier output are corresponding one by one with 8 road NTP synchronizing signals and the PTP synchronizing signal of Layer 2 switch output respectively, and by cable transmission to individual (P=8 in the legend) observation instrument of P;
(5) buffer circuit in each observation instrument carries out isolation processing to the PPS signal of input, input to the observation instrument main control unit after amplifying processing by amplifying circuit, carry out combined decoding realization time synchronized with NTP synchronizing signal or the PTP synchronizing signal of input observation instrument main control unit: when observation instrument is supported Network Time Protocol, then realize the Microsecond grade time synchronized by NTP synchronizing signal and the decoding of PPS combined signal; When observation instrument is supported IEEE1588 v2 agreement, then decode by the PTP synchronizing signal and realize the Microsecond grade time synchronized.
Wherein, observation instrument is that the access seabed observation network is used for carrying out physics, chemistry, the biological factor to the ocean water layer, the various object of observations such as the water body flow of abyssalbenthic rock, hydrothermal solution, microbe and oceanic crust inside, plate activity, Deformation of plates carry out long-term, continuous, stable real-time online observation and the scope of data acquisition, such as seismic detector, sampler, thermohaline deep profile instrument, deep sea camera etc.Each observation instrument can receive PPS signal, NTP synchronizing signal and PTP synchronizing signal simultaneously, can reduce the cost that observation instrument carries out precise synchronization like this.
Claims (3)
1. the method for synchronizing time of a submarine observation network observation instrument is characterized in that, may further comprise the steps:
(1) the NTP synchronizing signal of the PTN equipment of the main box of plugging into output and PTP synchronizing signal are through the Layer 2 switch of cable transmission to the inferior box of plugging into;
(2) Layer 2 switch is divided into the output of N+1 road with NTP synchronizing signal and the PTP synchronizing signal of input, N is positive integer, one road PTP synchronizing signal inputs to PTP from clock and decodedly goes out with the UTC time deviation after 200ns is with interior PPS signal, input to the PPS distribution amplifier of built-in crystal oscillator, all the other every roads, N road are exported NTP synchronizing signal and PTP synchronizing signal simultaneously;
(3) the PPS distribution amplifier is enlarged into M road PPS signal with the PPS signal distribution of input, and M is positive integer, M=N;
(4) the M road PPS signal of PPS distribution amplifier output is corresponding one by one with N road NTP synchronizing signal and the PTP synchronizing signal of Layer 2 switch output respectively, and by cable transmission to P observation instrument, P is positive integer, P=M=N;
(5) buffer circuit in each observation instrument carries out isolation processing to the PPS signal of input, input to the observation instrument main control unit after amplifying processing by amplifying circuit, carry out combined decoding realization time synchronized with NTP synchronizing signal or the PTP synchronizing signal of input observation instrument main control unit: when observation instrument is supported Network Time Protocol, then realize the Microsecond grade time synchronized by NTP synchronizing signal and the decoding of PPS combined signal; When observation instrument is supported IEEE1588 v2 agreement, then decode by the PTP synchronizing signal and realize the Microsecond grade time synchronized.
2. the method for synchronizing time of submarine observation network observation instrument according to claim 1, it is characterized in that, the plug into PTN equipment of box and the Layer 2 switch of the box of time plugging into of said master all is web-transporting devices of supporting IEEE1588 v2 agreement in the step (1), is operated in the pattern of boundary clock.
3. the method for synchronizing time of submarine observation network observation instrument according to claim 1 is characterized in that, said observation instrument is the equipment of the real-time online observation of access seabed observation network and data acquisition.
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| CN104409150A (en) * | 2014-11-27 | 2015-03-11 | 中国人民解放军91655部队 | Intelligent photoelectric sensing submarine cable |
| CN107819510A (en) * | 2017-09-29 | 2018-03-20 | 黄玉宇 | Submarine science observation grid system based on beehive net technology |
| CN107911175A (en) * | 2017-12-14 | 2018-04-13 | 中天海洋系统有限公司 | A kind of seabed is plugged into box telecommunication system structure |
| CN108534742A (en) * | 2018-04-24 | 2018-09-14 | 浙江大学 | The multinode synchronous data sampling system and method that underwater Deformation of surface figure monitors in real time |
| CN110489855A (en) * | 2019-08-15 | 2019-11-22 | 厦门大学 | A kind of thermohaline deep profile instrument comparison on the sea data alignment method |
| CN113985723A (en) * | 2021-10-14 | 2022-01-28 | 江苏省地震局 | Beidou-based regional geophysical observer NTP time service system and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409150A (en) * | 2014-11-27 | 2015-03-11 | 中国人民解放军91655部队 | Intelligent photoelectric sensing submarine cable |
| CN107819510A (en) * | 2017-09-29 | 2018-03-20 | 黄玉宇 | Submarine science observation grid system based on beehive net technology |
| CN107819510B (en) * | 2017-09-29 | 2018-09-18 | 黄玉宇 | Submarine science observation grid system based on beehive net technology |
| CN107911175A (en) * | 2017-12-14 | 2018-04-13 | 中天海洋系统有限公司 | A kind of seabed is plugged into box telecommunication system structure |
| CN108534742A (en) * | 2018-04-24 | 2018-09-14 | 浙江大学 | The multinode synchronous data sampling system and method that underwater Deformation of surface figure monitors in real time |
| CN110489855A (en) * | 2019-08-15 | 2019-11-22 | 厦门大学 | A kind of thermohaline deep profile instrument comparison on the sea data alignment method |
| CN110489855B (en) * | 2019-08-15 | 2020-12-04 | 厦门大学 | Alignment method for marine comparison and measurement data of thermohaline deep section instrument |
| CN113985723A (en) * | 2021-10-14 | 2022-01-28 | 江苏省地震局 | Beidou-based regional geophysical observer NTP time service system and method |
| CN113985723B (en) * | 2021-10-14 | 2022-09-16 | 江苏省地震局 | Beidou-based regional geophysical observer NTP time service system and method |
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Application publication date: 20130213 |