CN110198211B - Time frequency signal synthesis device based on multi-source time frequency signal fusion - Google Patents
Time frequency signal synthesis device based on multi-source time frequency signal fusion Download PDFInfo
- Publication number
- CN110198211B CN110198211B CN201910318774.1A CN201910318774A CN110198211B CN 110198211 B CN110198211 B CN 110198211B CN 201910318774 A CN201910318774 A CN 201910318774A CN 110198211 B CN110198211 B CN 110198211B
- Authority
- CN
- China
- Prior art keywords
- signal
- signals
- frequency signal
- frequency
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Electric Clocks (AREA)
Abstract
The invention provides a time frequency signal synthesis device based on multi-source time frequency signal fusion, which carries out synthesis processing on signals of a plurality of sources, wherein each source outputs a frequency signal and a pulse per second signal, and the synthesis device comprises: the channel processing device comprises a plurality of channels, a part of channels are used for inputting a plurality of frequency signals at the same time, a part of channels are used for inputting a plurality of pulse per second signals at the same time, the frequency signals transmitted through the channels are weighted and averaged to be used as standard frequency signals, the plurality of pulse per second signals are averaged to obtain the pulse per second signal closest to the averaged pulse per second to be used as a reference signal, the position of a zero-crossing point of the standard frequency signal is used as a rising edge of the pulse per second signal to generate a plurality of pulse per second signals, and the pulse per second signal generated by the standard frequency signal closest to the reference signal is used as an output pulse per second signal. The failure of a certain source at the upper stage of the integrated device can not cause the direct interruption of frequency signals to influence the high-precision transmission of the time frequency of the next stage of optical fiber.
Description
Technical Field
The invention relates to the technical field of time frequency, in particular to a time frequency signal synthesis device based on multi-source time frequency signal fusion.
Background
In the existing atomic time scale system, the frequency signal from the main clock is output after being subjected to micro-jump (frequency change), other atomic clock signals are only used for comparing the frequency with the control signal micro-jump value, once the main clock signal is interrupted, the micro-jump output signal is also interrupted, and the system reliability is poor.
In the existing commercial frequency scale synthesizer, the sine wave signal is only used as a frequency signal, and when the frequency scale synthesizer is synthesized, the signal frequency value is only used for weighted average processing.
How to reliably and effectively process time frequency signals at the junction of a plurality of optical fiber time frequency transmission links is still lack of effective technology and products at present.
Disclosure of Invention
In view of the above problems, the present invention provides a time-frequency signal synthesizer based on multi-source time-frequency signal fusion, which does not cause direct interruption of frequency signals even if a source of a previous stage fails, and thus does not affect the time-frequency high-precision transmission of a next stage of optical fiber.
In order to achieve the above object, the time-frequency signal synthesis apparatus according to the present invention, which synthesizes signals from a plurality of sources, each of which outputs a frequency signal and a pulse per second, includes: the channel processing device comprises a plurality of channels, a part of channels are used for inputting a plurality of frequency signals at the same time, a part of channels are used for inputting a plurality of pulse per second signals at the same time, the frequency signals transmitted through the channels are weighted and averaged to be used as standard frequency signals, the plurality of pulse per second signals are averaged to obtain the pulse per second signal closest to the averaged pulse per second to be used as a reference signal, the position of a zero-crossing point of the standard frequency signal is used as a rising edge of the pulse per second signal to generate a plurality of pulse per second signals, and the pulse per second signal generated by the standard frequency signal closest to the reference signal is used as an output pulse per second signal.
Preferably, the time-frequency signal synthesis apparatus based on multi-source time-frequency signal fusion further includes:
the plurality of down-conversion modules are used for realizing down-conversion of frequency signals output by the plurality of sources and crystal oscillator frequency signals output by the crystal oscillator module and transmitting the frequency signals to the signal acquisition processing control module;
the crystal oscillator module generates a crystal oscillator frequency signal and sends the crystal oscillator frequency signal to the down-conversion module; the crystal oscillator frequency signal processed by the signal acquisition processing control unit is used as an output standard frequency signal and is transmitted to the pulse per second receiving and processing module;
the signal acquisition processing control module comprises a multi-channel A/D acquisition unit and a D/A unit, wherein the A/D acquisition unit acquires frequency signals of a plurality of channels subjected to down-conversion to obtain relative phases among the frequency signals of the channels, a standard frequency signal is obtained by adopting weighted average, and the D/A unit is used for controlling a crystal oscillator frequency signal output by the crystal oscillator module to enable the phase of the crystal oscillator frequency signal to be consistent with the phase of the standard frequency signal;
and the second pulse processing module is used for averaging the second pulse signals input into each channel, screening out the second pulse signal closest to the average value as a reference signal, generating a plurality of second pulse signals by taking the position of a zero-crossing point of the standard frequency signal of the crystal oscillator module as a rising edge of the second pulse, and taking the second pulse signal generated by the standard frequency signal closest to the reference signal as the output second pulse signal.
Further, preferably, the time-frequency signal synthesis apparatus based on multi-source time-frequency signal fusion further includes:
and the data receiving and processing module is used for receiving the data signals of all the channels, fusing the data signals of all the sources and generating a new data signal, wherein the data signal comprises the characteristics of a reserved source atomic clock, a time frequency signal transmission path and an important correction value.
Furthermore, it is preferable that the relative phases of the frequency signals of the plurality of source inputs to the respective channels are kept uniform within a range of 200 ps.
Further, preferably, the system further comprises an alarm module, and the relative phase of the frequency signal input into each channel is not within the range of 200ps, and sends out an alarm signal.
Preferably, the rising edge position of the pulse per second signal input by each channel is aligned with the zero crossing position of the frequency signal input by the channel.
Preferably, the digital communication device further comprises a channel for inputting a digital status signal corresponding to each frequency signal, wherein the digital status signal is used for indicating whether the frequency signal input by each channel is normal or abnormal.
Preferably, the frequency signal is a sine wave signal.
The time frequency signal synthesis device based on multi-source time frequency signal fusion provides a connecting means for reliable transmission of time frequency signals between optical fiber time frequency high-precision transmission nodes. For the junction of a plurality of optical fiber time frequency high-precision transmission links, a plurality of time frequency signals and data information output by a previous-stage source are used as the source of a next-stage source. And (4) carrying out consistency (better than 200ps) check on the second pulse signals output by the previous-stage source to ensure that the second pulse signals are error-free. Accurately measuring a plurality of frequency signals (sine wave phases) output by a previous-stage source by using a double-mixing time difference measuring technology; and carrying out weighted average on the frequency signal (phase) by using the measurement result and the data information acquired from the previous-stage source, and controlling the crystal oscillator to output accurate frequency and phase signals. Because there is not direct frequency signal connection from the previous source to the next source, only information flow connection, thereby ensuring that even if some device of the previous source fails, the next source will not cause direct interruption of frequency signal and affect high precision transmission of optical fiber time frequency.
Drawings
FIG. 1 is a schematic diagram of a time-frequency signal synthesis device based on multi-source time-frequency signal fusion according to the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Fig. 1 is a schematic diagram of a block diagram of a time-frequency signal synthesis device based on multi-source time-frequency signal fusion according to the present invention, as shown in fig. 1, the synthesis device performs synthesis processing on signals of multiple sources, each source outputs a frequency signal and a pulse per second signal, and the synthesis device includes: and a plurality of channels, some of which are used for simultaneously inputting a plurality of frequency signals (frequency signals 1, 2, …, n), some of which are used for simultaneously inputting a plurality of second pulse signals (second pulse signals 1, 2, …, n), the plurality of frequency signals transmitted through the channels are weighted and averaged to be used as standard frequency signals, the plurality of second pulse signals are averaged to obtain the second pulse signal closest to the averaged second pulse as a reference signal, the plurality of second pulse signals are generated by taking the zero-crossing point of the standard frequency signals as the rising edge of the second pulse signals, and the second pulse signal generated by the standard frequency signal closest to the reference signal is used as the output second pulse signal.
Preferably, as shown in fig. 1, the time-frequency signal synthesis apparatus based on multi-source time-frequency signal fusion further includes:
the plurality of down-conversion modules 10 are used for performing down-conversion on the frequency signals output by the plurality of sources and the crystal oscillator frequency signals output by the crystal oscillator module 20, and transmitting the frequency signals to the signal acquisition processing control module 30;
the crystal oscillator module 20 generates a crystal oscillator frequency signal and sends the crystal oscillator frequency signal to the down-conversion module 10; the crystal oscillator frequency signal processed by the signal acquisition processing control unit is used as an output standard frequency signal and is transmitted to the pulse per second receiving and processing module 40;
the signal acquisition processing control module 30 comprises a multi-channel A/D acquisition unit and a multi-channel D/A unit, wherein the A/D acquisition unit acquires frequency signals of a plurality of channels subjected to down-conversion to obtain relative phases among the frequency signals of the channels, a standard frequency signal is obtained by adopting weighted average, and the D/A unit controls the crystal oscillator frequency signal output by the crystal oscillator module 20 to enable the phase of the crystal oscillator frequency signal to be consistent with the phase of the standard frequency signal;
the pulse-per-second processing module 40 averages the pulse-per-second signals input to the respective channels, selects a pulse-per-second signal closest to the average value as a reference signal, generates a plurality of pulse-per-second signals by using a zero-crossing point position of the standard frequency signal of the crystal oscillator module 20 as a rising edge of the pulse-per-second, and outputs a pulse-per-second signal generated from the standard frequency signal closest to the reference signal.
Further, preferably, the time-frequency signal synthesis apparatus based on multi-source time-frequency signal fusion further includes:
and the data receiving and processing module 50 receives the data signals (data signals 1, 2, …, n) of each channel, fuses the data signals of each source, and generates a new data signal, wherein the data signal comprises the characteristics of the original source atomic clock, the time frequency signal transmission path and the important correction value.
In addition, preferably, the signal acquisition processing control module 30 further calculates the frequency stability of each channel frequency signal, and obtains a standard frequency signal by using a weighted average of a plurality of frequency signals meeting the frequency stability requirement, for example, the frequency stability of each channel frequency signal is calculated according to the international Allan variance.
In the time frequency signal synthesis device based on multi-source time frequency signal fusion, frequency signals (sine waves) output by each input channel and the crystal oscillator module are down-converted into low-frequency sine wave signals; the signal acquisition processing control module acquires low-frequency sine wave signals to obtain relative phases and changes of the sine wave signals of all channels, the relative phases and the changes of the sine wave signals are weighted and averaged to obtain a crystal oscillator control frequency phase value, and the low-noise D/A unit is used for controlling the frequency signals output by the crystal oscillator module to enable the frequency and the phase of the frequency signals output by the crystal oscillator module to be consistent with the frequency and phase weighted and averaged result of the input frequency signals.
Furthermore, it is preferable that the relative phases of the frequency signals input to the channels from the plurality of sources are consistent within a certain range (within 200ps), but are not arbitrary, and if they are arbitrary, the time represented by the zero-crossing point of the sine wave is confused. The phase of the output standard frequency signal is also required to be consistent with the phase of the input frequency signal. The input frequency signals with relative phases beyond a certain range (within 200ps range) are subjected to error alarm processing, that is, the method further preferably comprises an alarm module, and the relative phases of the frequency signals input into each channel are not within 200ps range, so that an alarm signal is sent out.
Preferably, the rising edge position of the pulse per second signal input by each channel is aligned with the zero crossing position of the frequency signal input by the channel.
Preferably, the digital state signal processing device further comprises a channel for inputting the digital state signal (digital state signals 1-n) corresponding to each frequency signal, wherein the digital state signal is used for indicating whether the frequency signal input by each channel is normal or abnormal.
Preferably, the frequency signal is a sine wave signal.
The time frequency signal synthesis device based on multi-source time frequency signal fusion is mainly used for the synthesis processing of time frequency signals on the intersection points of a plurality of optical fiber time frequency transmission paths, and is one of key devices for constructing an optical fiber time frequency transmission network. The comprehensive device not only comprehensively processes a plurality of pulse-per-second signals to generate new pulse-per-second signals, but also comprehensively processes a plurality of sine wave signals to generate new sine wave signals, and comprehensively processes a plurality of data information to generate comprehensive data information, and at present, no similar comprehensive processing device exists.
The integrated device of the invention uses the rising edge of the pulse per second signal as a coarse mark of the time, and uses the phase of the sine wave as a fine mark of the time, thereby having great advancement in technology. When the device performs comprehensive processing on a plurality of input sine wave signals, the device mainly performs alignment processing on the sine wave phase at the representation time, so that the finally output sine wave phase is the weighted average result of the phases of the plurality of input sine wave signals.
The input signal and the output signal of the integrated device are not directly connected through signals, only information is connected, and the output signal is not interrupted when any single input signal is interrupted, so that the reliability of the device is fully guaranteed.
While the foregoing disclosure shows illustrative embodiments of the invention, it should be noted that various changes and modifications could be made herein without departing from the scope of the invention as defined by the appended claims. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Claims (8)
1. A time-frequency signal synthesis device based on multi-source time-frequency signal fusion is characterized in that signals of a plurality of sources are subjected to synthesis processing, each source outputs a frequency signal and a pulse per second signal, and the synthesis device comprises: the system comprises a plurality of channels, wherein one part of the channels are used for simultaneously inputting a plurality of frequency signals, each channel is used for transmitting one second pulse signal, the other part of the channels are used for simultaneously inputting a plurality of second pulse signals, each channel is used for transmitting one second pulse signal, the plurality of frequency signals transmitted by the channels are weighted and averaged to serve as standard frequency signals, the plurality of second pulse signals are averaged to obtain the second pulse signal closest to the averaged second pulse as a reference signal, the zero-crossing point of the standard frequency signals is used as the rising edge of the second pulse signals to generate a plurality of second pulse signals, and the second pulse signals generated by the standard frequency signals closest to the reference signal are used as output second pulse signals.
2. The apparatus for synthesizing time-frequency signals based on multi-source time-frequency signal fusion according to claim 1, further comprising:
the plurality of down-conversion modules are used for realizing down-conversion of frequency signals output by the plurality of sources and crystal oscillator frequency signals output by the crystal oscillator module and transmitting the frequency signals to the signal acquisition processing control module;
the crystal oscillator module generates a crystal oscillator frequency signal and sends the crystal oscillator frequency signal to the down-conversion module; the crystal oscillator frequency signal processed by the signal acquisition processing control unit is used as an output standard frequency signal and is transmitted to the pulse per second receiving and processing module;
the signal acquisition processing control module comprises a multi-channel A/D acquisition unit and a D/A unit, wherein the A/D acquisition unit acquires frequency signals of a plurality of channels subjected to down-conversion to obtain relative phases among the frequency signals of the channels, a standard frequency signal is obtained by adopting weighted average, and the D/A unit is used for controlling a crystal oscillator frequency signal output by the crystal oscillator module to enable the phase of the crystal oscillator frequency signal to be consistent with the phase of the standard frequency signal;
and the second pulse processing module is used for averaging the second pulse signals input into each channel, screening out the second pulse signal closest to the average value as a reference signal, generating a plurality of second pulse signals by taking the position of a zero-crossing point of the standard frequency signal of the crystal oscillator module as a rising edge of the second pulse, and taking the second pulse signal generated by the standard frequency signal closest to the reference signal as the output second pulse signal.
3. The apparatus for synthesizing time-frequency signals based on multi-source time-frequency signal fusion according to claim 2, further comprising:
and the data receiving and processing module is used for receiving the data signals of all the channels, fusing the data signals of all the sources and generating a new data signal, wherein the data signal comprises the characteristics of a reserved source atomic clock, a time frequency signal transmission path and an important correction value.
4. The device according to claim 1, wherein the relative phases of the frequency signals of the channels of the source inputs are consistent within 200 ps.
5. The time-frequency signal synthesis device based on multi-source time-frequency signal fusion of claim 4, characterized by further comprising an alarm module, wherein the relative phase of the frequency signals input into each channel is not within 200ps, and an alarm signal is sent out.
6. The time-frequency signal synthesis device based on multi-source time-frequency signal fusion of claim 1, wherein the rising edge position of the pulse-per-second signal input by each channel is aligned with the zero-crossing position of the frequency signal input by the channel.
7. The multi-source time-frequency signal fusion-based time-frequency signal synthesis device according to claim 1, further comprising a channel for inputting a digital status signal corresponding to each frequency signal, the digital status signal indicating whether the frequency signal inputted by each channel is normal or abnormal.
8. The device according to any one of claims 1-7, wherein the frequency signal is a sine wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910318774.1A CN110198211B (en) | 2019-04-19 | 2019-04-19 | Time frequency signal synthesis device based on multi-source time frequency signal fusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910318774.1A CN110198211B (en) | 2019-04-19 | 2019-04-19 | Time frequency signal synthesis device based on multi-source time frequency signal fusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110198211A CN110198211A (en) | 2019-09-03 |
| CN110198211B true CN110198211B (en) | 2021-12-03 |
Family
ID=67752134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910318774.1A Active CN110198211B (en) | 2019-04-19 | 2019-04-19 | Time frequency signal synthesis device based on multi-source time frequency signal fusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110198211B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609462B (en) * | 2019-09-20 | 2021-04-13 | 西安空间无线电技术研究所 | High-stability clock synthesis device and method based on atomic clock group |
| CN110989326B (en) * | 2019-12-26 | 2021-03-30 | 中国计量科学研究院 | Local high-precision time frequency real-time comprehensive device |
| CN110989327B (en) * | 2019-12-26 | 2021-03-30 | 中国计量科学研究院 | Distributed high-precision time frequency real-time integrated system |
| CN111106870B (en) * | 2019-12-26 | 2021-08-17 | 中国计量科学研究院 | Super-long-distance dual-fiber interconnected multistage optical fiber time frequency transmission system |
| CN111447019B (en) * | 2020-03-05 | 2021-12-31 | 中国电子科技集团公司第二十九研究所 | Device for fusing pulse signals among multiple modules |
| CN112671464B (en) * | 2020-12-10 | 2023-02-24 | 中国计量科学研究院 | Double-channel time frequency high-precision transmission intermediate node device |
| CN112713981B (en) * | 2020-12-10 | 2023-03-14 | 中国计量科学研究院 | Double-channel time frequency high-precision transmission device and method |
| CN112688753B (en) * | 2020-12-10 | 2023-02-24 | 中国计量科学研究院 | High-precision transmission device for looped network double-channel time frequency |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4768109A (en) * | 1983-12-24 | 1988-08-30 | Victor Company Of Japan, Ltd. | Video signal recording and/or reproducing apparatus |
| CN101217276A (en) * | 2007-01-03 | 2008-07-09 | 三星电子株式会社 | Method and apparatus for generating multi-phase signals |
| CN101231337A (en) * | 2008-02-15 | 2008-07-30 | 哈尔滨工程大学 | High-precision time synchronizing apparatus |
| CN201266923Y (en) * | 2008-09-09 | 2009-07-01 | 北京七维航测科技发展有限公司 | GPS combined time frequency instrument |
| CN102611516A (en) * | 2012-01-17 | 2012-07-25 | 成都府河电力自动化成套设备有限责任公司 | Method and device for generating high-precision synchronous clock |
| CN203261316U (en) * | 2013-05-28 | 2013-10-30 | 中国人民解放军63921部队 | Clock source |
| CN103457716A (en) * | 2013-09-13 | 2013-12-18 | 烟台东方英达康自动化技术有限公司 | Optimizing time synchronizing device for multi-channel clock sources |
| CN104330966A (en) * | 2014-10-22 | 2015-02-04 | 中国人民解放军信息工程大学 | Multi-mode high-precision time and frequency standard equipment |
| CN108112069A (en) * | 2017-12-19 | 2018-06-01 | 福建三元达网络技术有限公司 | A kind of synchronization keeping method and system of TDD-LTE equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930387A (en) * | 2015-06-11 | 2015-09-23 | 合肥鑫晟光电科技有限公司 | LED lamp strip structure, controlling method of LED lamp strip structure, backlight module and liquid-crystal display device |
-
2019
- 2019-04-19 CN CN201910318774.1A patent/CN110198211B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4768109A (en) * | 1983-12-24 | 1988-08-30 | Victor Company Of Japan, Ltd. | Video signal recording and/or reproducing apparatus |
| CN101217276A (en) * | 2007-01-03 | 2008-07-09 | 三星电子株式会社 | Method and apparatus for generating multi-phase signals |
| CN101231337A (en) * | 2008-02-15 | 2008-07-30 | 哈尔滨工程大学 | High-precision time synchronizing apparatus |
| CN201266923Y (en) * | 2008-09-09 | 2009-07-01 | 北京七维航测科技发展有限公司 | GPS combined time frequency instrument |
| CN102611516A (en) * | 2012-01-17 | 2012-07-25 | 成都府河电力自动化成套设备有限责任公司 | Method and device for generating high-precision synchronous clock |
| CN203261316U (en) * | 2013-05-28 | 2013-10-30 | 中国人民解放军63921部队 | Clock source |
| CN103457716A (en) * | 2013-09-13 | 2013-12-18 | 烟台东方英达康自动化技术有限公司 | Optimizing time synchronizing device for multi-channel clock sources |
| CN104330966A (en) * | 2014-10-22 | 2015-02-04 | 中国人民解放军信息工程大学 | Multi-mode high-precision time and frequency standard equipment |
| CN108112069A (en) * | 2017-12-19 | 2018-06-01 | 福建三元达网络技术有限公司 | A kind of synchronization keeping method and system of TDD-LTE equipment |
Non-Patent Citations (1)
| Title |
|---|
| "国家授时中心的卫星电视时间信号测量系统";梁双有;《2005年全国时间频率学术交流会》;20051130;第232-236页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110198211A (en) | 2019-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110198211B (en) | Time frequency signal synthesis device based on multi-source time frequency signal fusion | |
| CN111385047B (en) | Time synchronization method and electronic equipment | |
| CN103605023A (en) | Method and device for measuring merging unit time characteristics | |
| US20070224958A1 (en) | Receiver circuit and receiver circuit testing method | |
| CN111106870B (en) | Super-long-distance dual-fiber interconnected multistage optical fiber time frequency transmission system | |
| JP2009212992A (en) | Semiconductor integrated circuit device and eye open margin evaluation method | |
| CN104283665A (en) | Point to multi-point clock-forwarded signaling for large displays | |
| CN103427918A (en) | On-chip interferers for standards compliant jitter tolerance testing | |
| CN103346852A (en) | Apparatus capable of providing reference clock signal | |
| US20060067449A1 (en) | Data processing device including clock recovery from various sources | |
| US20160170382A1 (en) | Time Synchronization Control Apparatus And Method | |
| US20070201591A1 (en) | BTS span synchronization utilizing an external span qualification reference | |
| CN112969229B (en) | Clock correction method and device and network equipment | |
| CN100586055C (en) | Clock transmission apparatus for performing network synchronization of systems | |
| US11815552B2 (en) | Clock frequency monitoring device and clock frequency monitoring method | |
| CN107769778B (en) | Signal sampling device and signal sampling calibration method | |
| CN113411082A (en) | Zero-delay circuit for multi-path clock output and input alignment | |
| KR101449615B1 (en) | Method for synchronizing a plurality of measuring channel assemblies and/or measuring devices, and appropriate measuring device | |
| CN113852438A (en) | Clock buckle plate, distributed system and clock synchronization method of distributed system | |
| CN109828632B (en) | FPGA-based adjustable ultra-narrow multipath synchronous pulse generation device and method | |
| EP1271838B1 (en) | Devices and methods for improving jitter transfer in optical modules | |
| CN107359873B (en) | Device and method for calibrating clock error of merging unit tester based on phase locking and phase shifting | |
| Clancy et al. | Using SpaceWire time codes for spacecraft time synchronization | |
| JP4291641B2 (en) | Time difference measuring method and apparatus, and time difference measuring program | |
| KR101711543B1 (en) | An apparatus for encoding data in a distributed telemetry encoder system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |