CN104104461A - Time synchronization system and time synchronization method - Google Patents
Time synchronization system and time synchronization method Download PDFInfo
- Publication number
- CN104104461A CN104104461A CN201410381388.4A CN201410381388A CN104104461A CN 104104461 A CN104104461 A CN 104104461A CN 201410381388 A CN201410381388 A CN 201410381388A CN 104104461 A CN104104461 A CN 104104461A
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- CN
- China
- Prior art keywords
- gps
- antenna
- gps signal
- electronic installation
- relaying
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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
- G01S19/11—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
-
- 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
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Electric Clocks (AREA)
- Radio Relay Systems (AREA)
Abstract
Disclosed are a time synchronization system and a time synchronization method. The time synchronization system comprises a GPS (global positioning system) antenna, a GPS repeater and an electronic device. The GPS antenna receives GPS signals which contain time information; the GPS repeater is coupled to the GPS antenna and composed of a transmitting antenna and transmits the GPS signals into repeated GPS signals; the electronic device comprises a GPS receiver and a time synchronizer, wherein the GPS receiver comprises a receiving antenna to receive the repeated GPS signals, and the time synchronizer is coupled to the GPS receiver to set the time of the electronic device according to the time information; the GPS antenna is different from the transmitting antenna of the GPS repeater in polarization type.
Description
Technical field
The present invention relates to the system and method for a kind of time synchronized (time synchronization), and being particularly related to one utilizes global positioning system (Global Positioning System, GPS) signal with synchronous system and method for time of implementation.
Background technology
Along with science and technology is fast-developing, mobile communication network day by day universal, the number of electronic devices of family expenses also increases day by day, and have many electronic installations need can time of implementation simultaneous operation can correctly operating.For example, in order to make can there be good mobile communication network reception quality indoor, can be at indoor small base station (the small cell that arranges, for example femtocell, picocell or microcell), to improve signal in indoor coverage rate, and small base station need to be synchronizeed with accurate clock signal.Therefore, how can effectively reach precise time for indoor electronic installation synchronous, be one of problem of endeavouring of current industry.
Summary of the invention
The object of the present invention is to provide a kind of clock synchronization system and method for synchronizing time, make to be positioned at indoor electronic installation and can carry out according to gps signal the setting of time synchronized, and can avoid system generation oscillatory occurences, effectively promote the convenience of electronic installation on using.
According to a first aspect of the invention, a kind of clock synchronization system is proposed.Clock synchronization system comprises gps antenna, GPS repeater and electronic installation.Gps antenna receives gps signal, and gps signal comprises temporal information.GPS repeater is coupled to gps antenna, and GPS repeater comprises transmitting antenna, and gps signal is forwarded to the gps signal for relaying.Electronic installation comprises gps receiver and synchrotimer.Gps receiver comprises reception antenna, receives the gps signal of relaying.Synchrotimer is coupled to gps receiver, sets the time of electronic installation according to temporal information.Wherein the polarization type of gps antenna is different from the polarization type of the transmitting antenna of GPS repeater.
According to a second aspect of the invention, a kind of clock synchronization system is proposed.Clock synchronization system comprises gps antenna, GPS repeater and electronic installation.Gps antenna receives gps signal, and gps signal comprises temporal information.GPS repeater is coupled to gps antenna, and GPS repeater comprises transmitting antenna, and gps signal is forwarded to the gps signal for relaying.Electronic installation comprises gps receiver and synchrotimer.Gps receiver comprises reception antenna, receives the gps signal of relaying.Synchrotimer is coupled to gps receiver, sets the time of electronic installation according to temporal information.Wherein the transmitting antenna of GPS repeater is linear polarized antenna.
According to a third aspect of the invention we, propose a kind of method for synchronizing time, comprise the following steps: to receive a gps signal, this gps signal comprises a temporal information; Taking the polarization mode different from this gps signal, this gps signal is forwarded to the gps signal as a relaying; One electronic installation receives the gps signal of this relaying; And set time of this electronic installation according to this temporal information.
According to a forth aspect of the invention, propose a kind of method for synchronizing time, comprise the following steps: to receive a gps signal, this gps signal comprises a temporal information; In linear polarization mode, this gps signal is forwarded to the gps signal as a relaying; One electronic installation receives the gps signal of this relaying; And set time of this electronic installation according to this temporal information.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 illustrates the schematic diagram according to the clock synchronization system of one embodiment of the invention;
Fig. 2 illustrates the flow chart according to the method for synchronizing time of one embodiment of the invention.
Wherein, Reference numeral
1: clock synchronization system
10:GPS antenna
11:GPS repeater
12: electronic installation
20: transmitting antenna
21:GPS receiver
22: reception antenna
23: synchrotimer
24: cable
31～34: step
SO:GPS signal
SR: the gps signal of relaying
W: window
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and operation principle are described in detail:
The operation that the electronic installation time of implementation is synchronous, can carry out according to specific time synchronization protocol, for example network time agreement (Network Time Protocol, or chronometer time agreement (Precision Time Protocol NTP), PTP), connect via network, the clock server from network obtains correct temporal information electronic installation is carried out to the setting of time synchronized.But, because the data of network are with package transmission, time delay in various degree can be caused in the different paths that different packages are walked on network, cause the accuracy of the method for synchronizing time connecting by network not high enough, particularly upper compared with under the situation away from clock server at topology network (network topology) at electronic installation, this problem will be more remarkable.
In order to reach, more precise time is synchronous, can be synchronous with the time of implementation according to gps signal, and gps signal provides point-device time source, and need not be through network package transmission.But, be positioned at electronic installation Chang Wufa indoor or veil below and receive good gps signal, in order to make the electronic installation can be synchronous according to the gps signal time of implementation, often electronic installation must be placed on outdoor or near window to obtain good gps signal quality.But, the electronic installation of for example small base station is placed on to window limit, limit to the scope that small base station can use, ideally, small base station should be tried one's best near the center of indoor user's scope of activities, to obtain best signal covering scope.
In order to make the electronic installation below indoor or veil can use gps signal to make time synchronized, and make the position of electronic installation ornaments need not be confined to window limit, the present invention proposes a kind of clock synchronization system and method for synchronizing time, utilize the mode that forwards gps signal, be forwarded to indoor environment by being present in outdoor gps signal, make can receive the good gps signal of quality at indoor electronic installation, to carry out the setting of time synchronized according to the temporal information of gps signal.Below describe embodiments of the invention in detail.
Fig. 1 illustrates the schematic diagram according to the clock synchronization system of one embodiment of the invention.Clock synchronization system 1 comprises gps antenna 10, GPS repeater (repeater) 11 and electronic installation 12.Gps antenna 10 receives gps signal SO, and gps signal SO comprises temporal information Ti.GPS repeater 11 is coupled to gps antenna 10, and GPS repeater 11 comprises transmitting antenna 20, and gps signal SO is forwarded to the gps signal SR for relaying.Electronic installation 12 can be positioned at indoor or veil below, comprises gps receiver 21, synchrotimer 23 and other element.Gps receiver 21 comprises reception antenna 22, receives the gps signal SR of relaying.Synchrotimer 23 is coupled to gps receiver 21, sets the time of electronic installation 12 according to temporal information Ti.Wherein the polarization type of gps antenna 10 is different from the polarization type of the transmitting antenna 20 of GPS repeater 11.Hereby each element is described in detail as follows.
Because clock synchronization system 1 is the foundation of making time synchronized according to gps signal SO, must receive and come from aerial gps signal SO.In this embodiment, gps antenna 10 is more suitable to be arranged in outdoor environment, and as shown in Figure 1, gps antenna 10 is arranged at the outside of window W, and between sky, there is no the position of barrier, can there be preferably gps signal SO receiving quality.But the present invention do not limit and furnish in this position, gps antenna 10 also can be placed in the roof of building, even also can be placed in the indoor position near window W, as long as having the position of good gps signal receiving ability.Gps antenna 10 is placed in to the indoor cost that can save in engineering, for example fixing means, waterproof of device and anti-lightning strike element etc.And because gps signal SO is right hand circularly polarised wave (Right Hand Circular Polarization, RHCP), gps antenna 10 preferably should use RHCP antenna, to reach good polarization matching effect, can there is good signal receiving quality.
Due to the barrier of barrier, be arranged in the gps signal SO that electronic installation 12 indoor or veil below is difficult to directly receive outdoor environment, therefore clock synchronization system 1 is provided with GPS repeater 11, allows electronic installation 12 at least can receive the gps signal SR of relaying.
GPS repeater 11 can be via cable 24, and for example coaxial cable (coaxial cable), is coupled to and is positioned over outdoor or indoor gps antenna 10, utilizes cable 24 to transmit gps signal SO.Connect gps antenna 10 and GPS repeater 11 by cable 24, make GPS repeater 11 can be configured in the convenient position arranging of user.Certainly, GPS repeater 11 can be also integrally formed with gps antenna 10, and GPS repeater 11 bodies are with gps antenna 10, and so GPS repeater 11 need be placed on the position near window W, gps antenna 10 is approached outdoor.
Cable 24 can produce the losses of signal, therefore the length of cable 24 be not suitable for oversize, for example, below 10 meters.GPS repeater 11 comprises transmitting antenna 20, and gps signal SO is forwarded as the gps signal SR of relaying, electronic installation 12 can be received obtain the gps signal SR of relaying.Because the gps signal SR of relaying comprises temporal information Ti equally, electronic installation 12 just can carry out time synchronized setting according to this.GPS repeater 11 can be by the power amplification of signal, indoor electronic installation 12 can be known and receive enough gps signal SR of strong relaying of power.The covering scope that GPS repeater 11 transmits can need to suitably be adjusted depending on user the transmitting power of GPS repeater 11, for example, can be adjusted into and contain apart from 11 20 meters of GPS repeaters with interior scope.
It should be noted that, because the length of cable 24 is not long, and likely gps antenna 10 is to be attached on GPS repeater 11 bodies, gps signal SO in gps signal SR and the natural environment of the relaying that therefore transmitting antenna 20 produces may understand very approaching in space, and GPS repeater 11 can be by power amplification, make the signal strength signal intensity of the gps signal SR of relaying may be larger than original gps signal SO, and cause the gps signal SR of relaying likely to be received by gps antenna 10, form positive feedback loop (positive feedback), and cause system oscillation (oscillation) and unstable.
For overcoming the problems referred to above, in the present embodiment, the polarization type of gps antenna 10 is not identical with the polarization type of the transmitting antenna 20 of GPS repeater 11, therefore can reduce the degree of correlation (correlation) between the gps signal SR of gps signal SO and relaying, the vibration of avoiding positive feedback to cause to alleviate the annoyance level of signal.
For example gps antenna 10 is preferably use circular polarized antenna, 20 of transmitting antennas can use linear polarization (linear polarization) antenna, making the gps signal SR of the relaying that transmitting antenna 20 produces is line polarization wave, has reduced the degree of correlation between gps signal SO.And transmitting antenna 20 uses linear polarized antenna, therefore can there is the radiation pattern of omni-directional (omnidirection), can also make the gps signal SR of relaying have preferably signal covering scope.
Electronic installation 12 includes gps receiver 21, synchrotimer 23 and other element not illustrating.Gps receiver 21 comprises reception antenna 22, and to receive the gps signal SR of relaying, because the gps signal SR of relaying comprises the temporal information Ti identical with gps signal SO, synchrotimer 23 can be according to temporal information Ti to set the time of electronic installation 12.Clock synchronization system 1 in the present embodiment can be applicable to the multiple electronic installation 12 that includes gps receiver 21, and electronic installation 12 can be for example small base station, wireless access point (Wi-Fi AP), mobile device etc.
In the clock synchronization system 1 of the present embodiment, more can comprise multiple electronic installations, each electronic installation includes gps receiver, and therefore each electronic installation can receive the gps signal SR of relaying jointly, and carries out according to this setting of time synchronized.For example in office, can put many small base stations, each small base station all receives the gps signal that forwards from same GPS repeater and lock in time jointly.
In the present embodiment, the transmitting antenna 20 of GPS repeater 11 is linear polarized antennas, the gps signal SR of relaying is line polarization wave, therefore the reception antenna 22 of the gps receiver 21 of electronic installation 12 is preferably use linear polarized antenna, to reach good polarization matching effect.And if electronic installation 12 stationary devices, its putting position preferably should make the linear polarization direction of reception antenna 22 and the linear polarization direction of transmitting antenna 20 consistent, to obtain best signal reception.But the present invention is not limited to this, the reception antenna 22 of gps receiver 21 can be also circular polarized antenna, and circular polarized antenna is in receiving when line polarization wave, though have the unmatched loss of polarization, but still have an opportunity to receive the gps signal SR of relaying.Therefore, generally dispose the electronic installation of circular polarized antenna gps receiver, also can be applicable to the clock synchronization system 1 of the embodiment of the present invention.
In the clock synchronization system of the above embodiment of the present invention, owing to gps signal being forwarded to by GPS repeater to the position that is originally difficult to receive gps signal, make electronic installation indoor or veil below also can successfully carry out the setting of time synchronized according to gps signal.Thus, need to be according to the gps signal electronic installation of lock in time, do not need to be placed on window side to receive gps signal, as long as by the forwarding of GPS repeater, suitably put the position of GPS repeater, can make to be originally difficult to receive that also can there be good gps signal receiving quality the position of gps signal, just more flexible for the position that for example small base station can be put, promote the convenience in scope and the use that small base station can serve.
In addition, because the transmitting antenna of GPS repeater is not identical with the polarization type of gps antenna, adopt the antenna of different polarization type at the receiving terminal of GPS repeater and transmitting terminal, can avoid interfering with outdoor original gps signal in the gps signal of indoor relaying, effectively to avoid system generation oscillatory occurences.The transmitting antenna of GPS repeater uses linear polarized antenna, also can make the gps signal of relaying have preferably signal covering scope.
The present invention more proposes a kind of method for synchronizing time.Please refer to Fig. 2, Fig. 2 illustrates the flow chart according to the method for synchronizing time of one embodiment of the invention.First method for synchronizing time comprises the following steps:, in step 31, receives gps signal SO, and gps signal SO comprises temporal information Ti, for example, be with the gps signal SO in a gps antenna receiving chamber external environment.Then, in step 32, gps signal SO is forwarded to the gps signal SR for relaying, be for example to carry out with a GPS repeater step that forwards gps signal, allow the gps signal SR of relaying have different polarization modes from gps signal SO, or allow the gps signal SR of relaying be linear polarization signal.Afterwards, in step 33, electronic installation receives the gps signal SR of relaying, and electronic installation is to be for example positioned at indoor small base station.Then,, in step 34, set the time of electronic installation according to temporal information Ti.
Gps signal SR and gps signal SO for fear of relaying form positive feedback loop and cause vibration, and gps signal SO is different from the polarization type of the gps signal SR of relaying.For example, gps signal SO is circularly polarised wave, and the gps signal SR of relaying is line polarization wave.
In the method for synchronizing time of the above embodiment of the present invention, to forward the mode of gps signal, make indoor electronic installation also can have good gps signal receiving quality, and can lock in time.Because electronic installation is the gps signal that receives relaying, its position of putting can have more elasticity.In addition,, because gps signal is not identical with the gps signal polarization type of relaying, unlikely formation is disturbed, and can effectively avoid system oscillation.And the gps signal of relaying is line polarization wave, also can make the gps signal of relaying have preferably signal covering scope.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a clock synchronization system, is characterized in that, comprising:
One gps antenna, receives a gps signal, and this gps signal comprises a temporal information;
One GPS repeater, is coupled to this gps antenna, and this GPS repeater comprises a transmitting antenna, and it is the gps signal of a relaying that this gps signal is forwarded; And
One electronic installation, comprising:
One gps receiver, comprises a reception antenna, receives the gps signal of this relaying; And
One synchrotimer, is coupled to this gps receiver, sets the time of this electronic installation according to this temporal information;
Wherein the polarization type of this gps antenna is different from the polarization type of this transmitting antenna of this GPS repeater.
2. clock synchronization system according to claim 1, is characterized in that, this gps antenna is circular polarized antenna, and this transmitting antenna of this GPS repeater is linear polarized antenna, and this reception antenna of this gps receiver is linear polarized antenna.
3. a clock synchronization system, is characterized in that, comprising:
One gps antenna, receives a gps signal, and this gps signal comprises a temporal information;
One GPS repeater, is coupled to this gps antenna, and this GPS repeater comprises a transmitting antenna, and it is the gps signal of a relaying that this gps signal is forwarded; And
One electronic installation, comprising:
One gps receiver, comprises a reception antenna, receives the gps signal of this relaying; And
One synchrotimer, is coupled to this gps receiver, sets the time of this electronic installation according to this temporal information;
Wherein this transmitting antenna of this GPS repeater is linear polarized antenna.
4. clock synchronization system according to claim 3, is characterized in that, this gps antenna is circular polarized antenna, and this reception antenna of this gps receiver is linear polarized antenna.
5. according to the clock synchronization system described in claim 1 or 3, it is characterized in that, this electronic installation is small base station.
6. according to the clock synchronization system described in claim 1 or 3, it is characterized in that, this GPS repeater is positioned at indoor, and this GPS repeater is coupled to this gps antenna via a cable.
7. a method for synchronizing time, is characterized in that, comprising:
Receive a gps signal, this gps signal comprises a temporal information;
Taking the polarization mode different from this gps signal, this gps signal is forwarded to the gps signal as a relaying;
One electronic installation receives the gps signal of this relaying; And
Set the time of this electronic installation according to this temporal information.
8. method for synchronizing time according to claim 7, is characterized in that, this gps signal is circularly polarised wave, and the gps signal of this relaying is line polarization wave.
9. a method for synchronizing time, is characterized in that, comprising:
Receive a gps signal, this gps signal comprises a temporal information;
In linear polarization mode, this gps signal is forwarded to the gps signal as a relaying;
One electronic installation receives the gps signal of this relaying; And
Set the time of this electronic installation according to this temporal information.
10. according to the method for synchronizing time described in claim 7 or 9, it is characterized in that, this electronic installation is small base station.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381388.4A CN104104461A (en) | 2014-08-05 | 2014-08-05 | Time synchronization system and time synchronization method |
| CN201510181411.XA CN104765270A (en) | 2014-08-05 | 2015-04-16 | Time synchronization system and method |
| JP2015103995A JP6009617B2 (en) | 2014-08-05 | 2015-05-21 | Time synchronization system and time synchronization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381388.4A CN104104461A (en) | 2014-08-05 | 2014-08-05 | Time synchronization system and time synchronization method |
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| CN104104461A true CN104104461A (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410381388.4A Pending CN104104461A (en) | 2014-08-05 | 2014-08-05 | Time synchronization system and time synchronization method |
| CN201510181411.XA Pending CN104765270A (en) | 2014-08-05 | 2015-04-16 | Time synchronization system and method |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510181411.XA Pending CN104765270A (en) | 2014-08-05 | 2015-04-16 | Time synchronization system and method |
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| JP (1) | JP6009617B2 (en) |
| CN (2) | CN104104461A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016197228A1 (en) * | 2015-06-10 | 2016-12-15 | Smart Energy Instruments Inc. | Accurate time recovery from global navigation satellite system |
| CN108352727A (en) * | 2015-09-10 | 2018-07-31 | Cpg技术有限责任公司 | Use the global time synchronization of guide surface wave |
| CN110007587A (en) * | 2019-03-27 | 2019-07-12 | 国网上海市电力公司 | A kind of electric system time synchronization clock apparatus does not have a power failure the method for replacement |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227472A (en) * | 2018-02-06 | 2018-06-29 | 中国科学院长春光学精密机械与物理研究所 | A kind of event latch |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3879555B2 (en) * | 2002-03-25 | 2007-02-14 | ソニー株式会社 | Satellite broadcast receiving system and satellite broadcast receiving method |
| US20070063893A1 (en) * | 2005-09-08 | 2007-03-22 | Gps Source, Inc. | Spot Locator |
| CN101527592A (en) * | 2008-03-04 | 2009-09-09 | 佳邦科技股份有限公司 | Circularly polarized antenna relay and communication method thereof |
| AT13329U1 (en) * | 2008-10-27 | 2013-10-15 | Andrew Wireless Systems Gmbh | Repeater and method for operating such a repeater |
| CN201812149U (en) * | 2010-10-14 | 2011-04-27 | 烟台持久钟表集团有限公司 | Primary-secondary clock system |
| JP2013050349A (en) * | 2011-08-30 | 2013-03-14 | Seiko Epson Corp | Electronic timepiece with built-in antenna |
| CN202772904U (en) * | 2011-11-15 | 2013-03-06 | ***通信集团福建有限公司 | Device of time synchronizing signals |
| CN202798718U (en) * | 2012-09-19 | 2013-03-13 | 海南电网公司信息通信分公司 | Electric power time synchronization device for Beidou GPS (global positioning system) double satellite system |
| JP5542229B1 (en) * | 2013-03-25 | 2014-07-09 | ソフトバンクモバイル株式会社 | Notification server, notification method, and computer program |
| CN203287701U (en) * | 2013-06-21 | 2013-11-13 | 北京微赛思技术有限公司 | Universal type high-precision time synchronization system for mine |
| CN103901456B (en) * | 2014-04-14 | 2016-11-16 | 东南大学 | A kind of GPS terminal indoor locating system and method |
-
2014
- 2014-08-05 CN CN201410381388.4A patent/CN104104461A/en active Pending
-
2015
- 2015-04-16 CN CN201510181411.XA patent/CN104765270A/en active Pending
- 2015-05-21 JP JP2015103995A patent/JP6009617B2/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016197228A1 (en) * | 2015-06-10 | 2016-12-15 | Smart Energy Instruments Inc. | Accurate time recovery from global navigation satellite system |
| CN108352727A (en) * | 2015-09-10 | 2018-07-31 | Cpg技术有限责任公司 | Use the global time synchronization of guide surface wave |
| CN110007587A (en) * | 2019-03-27 | 2019-07-12 | 国网上海市电力公司 | A kind of electric system time synchronization clock apparatus does not have a power failure the method for replacement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6009617B2 (en) | 2016-10-19 |
| CN104765270A (en) | 2015-07-08 |
| JP2016038376A (en) | 2016-03-22 |
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Application publication date: 20141015 |