CN110069011A - Fiber optic stretch based on BD and GPS concentrates time dissemination system and time service method - Google Patents
Fiber optic stretch based on BD and GPS concentrates time dissemination system and time service method Download PDFInfo
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- CN110069011A CN110069011A CN201910342329.9A CN201910342329A CN110069011A CN 110069011 A CN110069011 A CN 110069011A CN 201910342329 A CN201910342329 A CN 201910342329A CN 110069011 A CN110069011 A CN 110069011A
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- 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
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Abstract
The invention discloses a kind of, and the fiber optic stretch based on BD and GPS concentrates time dissemination system and method, and system includes at least one satellite antenna, active time service host and at least an active time service allocation unit, the satellite antenna are connected with active time service host；The fiber optic stretch based on BD and GPS concentrates time dissemination system using BD/GPS antenna, the active and standby unit of 1+1 and allocation unit composition, improves the accuracy and safety of base station time service；It is transmitted using photoelectric mixed cable, can at least transmit one kilometer；If can make fiber optic stretch to 20 kilometers by the way of taking electricity nearby, fundamentally solve the problems, such as to influence base station selection because of limited transmission distance.
Description
Technical field
The invention belongs to mobile communications industry technical fields, more particularly, to a kind of fiber optic stretch collection based on BD and GPS
Middle time dissemination system and time service method.
Background technique
Time service refers to the equipment in communication network, by obtaining unified clock source signals, between the Lai Shixian network equipment
Synchronization, current mobile communications network generallys use the spaceborne clock of satellite as clock source.The global positioning system in the U.S.
(Global Positioning System, GPS), Beidou satellite navigation system (the BeiDou Navigation in China
Satellite System, BDS), all have the ability for mobile communications network time service.
Most domestic all uses the spaceborne clock of single GPS as clock source, using tradition in the base station of net operation at present
GPS time service antenna obtains clock signal and sends the baseband processing unit (hereinafter referred to as BBU) of base station to by feeder line.Antenna with
The receiver of BBU of base station side is connected by radio frequency feed line, and radio frequency feed line is not poor flexible compared with thick and flexibility, signal decaying
Fastly, long distance transmission need to increase line compensation amplifier.The characteristic of radio frequency feed line reduces the flexibility of BBU computer room addressing, increases
Big difficulty of construction and maintenance cost, as shown in Figure 1.In addition, GPS is the important foundation that U.S. army realizes that its Strategy & Tactics is intended to
Facility, under deadly condition, once system is closed or is disturbed, it will and cause communication system to be paralysed, there are huge security risks.
Therefore, it is necessary to which developing the fiber optic stretch based on BD/GPS that is i.e. safe and reliable and reducing cost concentrates time service system
System.
Summary of the invention
The technical problem to be solved by the present invention is to provide the light based on BD/GPS that is a kind of i.e. safe and reliable and reducing cost
Fibre zooms out concentration time dissemination system.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: should fiber optic stretch collection based on BD and GPS
Middle time dissemination system, including at least one satellite antenna, active time service host and an at least active time service allocation unit, it is described to defend
Star antenna is connected with the active time service host, the active time service host and the active time service allocation unit or/and base
Tape handling unit BBU is connected.
By adopting the above technical scheme, engineering construction difficulty and limited transmission distance are effectively solved using the method for fiber optic stretch
Problem, system equipment output information transmitted out by way of fiber optic stretch to the baseband processing unit BBU in computer room；It should
Fiber optic stretch based on BD and GPS concentrates time dissemination system to be transmitted using photoelectric mixed cable, can at least transmit one kilometer；Such as
Fruit can make fiber optic stretch to 20 kilometers by the way of taking electricity nearby, and fundamentally solving influences base because of limited transmission distance
Stand addressing the problem of；The fiber optic stretch based on BD and GPS concentrates time dissemination system by equipment cascading, can at most simultaneously be six
14 BBU time services realize multiple BBU multiplexing antenna feeders, same location antenna amount are greatly decreased, hardly possible of reducining the construction costs and construct
Degree；The second that the fiber optic stretch based on BD and GPS concentrates time dissemination system to send using Beidou satellite navigation system, GPS satellite is same
Signal and temporal information are walked, the clock synchronization work of the BBU of mobile communication base station is completed；It supports multiple system/frequency ranges simultaneously, improves
The safety of time service, additionally it is possible to BBU be supported to be randomly or based on certain strategy and select time dissemination system/frequency range；Intelligent monitor system is also
Multiple two-in-one antennas, GPS and Beidou signal, dual power supply can be monitored, when some antenna or power supply failure,
It can be intelligently switched to another antenna or power supply, and local alarm is carried out by LED light, screen；The system can pass through
Dry contact is issued to network management and monitoring system and is alerted；The system can simultaneously monitoring GPS and Beidou signal condition, in device screen
Upper display relevant information facilitates operation maintenance personnel to understand signal condition；The fiber optic stretch based on BD and GPS concentrates time dissemination system to adopt
Realize that more BBU share time service with the active and standby time service antenna of two-way；The system is used by BD/GPS time service antenna, the active and standby unit of 1+1
It is formed with allocation unit, or using the networkings such as Ethernet and optical-fiber network configuration, improves the accuracy and safety of base station time service.
As the preferred technical solution of the present invention, the active time service host includes CPU control module one, branch input mould
Block, self adaptive control amplification filtering and attenuation module, clock source module, BD/GPS source signal decoder module, branch export mould
Block and power management module one；The CPU control module one is used to send control hardware setting and information processing to other modules
Control information；The branch input module is for receiving the satellite-signal from the satellite antenna；The self adaptive control
Amplification filtering and attenuation module are for amplifying input signal, filtering or attenuation processing, to meet the BD/GPS information source
The amplitude range of signal decoder module；The clock source input module is wanted for being unable to reach time service information source in BD/GPS signal
When asking, time synchronizing signal is provided；The BD/GPS source signal decoder module is gone forward side by side horizontal lock for demodulating standard second signal,
Then the signal of standard clock signal is included at least to branch output module output；The branch output module is for replicating
The code multiplexing signal is simultaneously output to baseband processing unit BBU or has the source time service allocation unit；The power management mould
Block one is used to alternating current becoming direct current with power supply to the device.Every active time service host is all configured with two-way BD/GPS bimodulus
Receiving module, stabilizing clock source input module, uses closed-loop control to keep time the taming constant-temperature crystal oscillator of technology to realize high-precision all the way
The punctual clock source in punctual inside, and using the power supply mode of dual power supply, improve reliability.
As the preferred technical solution of the present invention, the active time service allocation unit includes CPU control module two, input mould
Block, control diverter module, multiple-channel output module and power management module two, the CPU control module two are used for other modules
Send the control information of control hardware setting and information processing；The input module is for receiving host or higher level's allocation unit
Output signal includes two-way BD/GPS signal input interface；The control diverter module is used to carry out the amplification of BD/GPS signal
And distribution；The multiple-channel output module includes eight tunnel synchronization signal output interfaces, for exporting time signal to Base-Band Processing list
First BBU or junior's allocation unit；The power management module two is used to alternating current becoming direct current with power supply to the device.
As the preferred technical solution of the present invention, the power management module one and the power management module two include
Two AC/DC conversion equipments.
As the preferred technical solution of the present invention, the satellite antenna is Beidou satellite navigation system and global positioning system
Two-in-one BD/GPS antenna；The BD/GPS antenna receives the time signal of big-dipper satellite BD and HA Global Positioning Satellite GPS；Institute
It states BD/GPS antenna and the active time service host is connected to by feeder line；The branch input module includes two-way BD/GPS input
Antennal interface determine to use BD or GPS for accessing two-way BD/GPS dual mode reception antenna, and according to the quality of signal
Signal as time service information source.Beidou satellite navigation system and the two-in-one BD/GPS antenna of global positioning system are an antenna
Two kinds of signals of big-dipper satellite and HA Global Positioning Satellite are received simultaneously.
As the preferred technical solution of the present invention, the clock source input module is in high precision temperature compensation crystal oscillator frequency
It is run in 10~10 magnitudes, the time synchronizing signal of output is made to still ensure that certain accuracy；When external time reference signal
When receiving recovery, the clock source for automatically switching to highest priority enters normal condition work, and switching time is less than 10mS.Clock
Source input module makes internal system have time punctual unit, and when receiving BDS or GPS-time reference signal, host is outer
Portion's reference signal is synchronous；It when not receiving external time reference signal, is kept time by internal clocking, is mended in internal high-precision temperature
It repays and is run in 10~10 magnitude of crystal oscillator frequency, the time synchronizing signal of output is made to still ensure that certain accuracy；When external
Between reference signal receive when restoring, the clock source for automatically switching to highest priority enters normal condition work, and switching time is small
In 10mS, (switching time refers to from normal external time reference signal is received to completing to switch, and restores the full mistake operated normally
The journey time).
As the preferred technical solution of the present invention, output of the input module for receiving host or higher level's allocation unit
Signal, the type of signal include SMA radiofrequency signal, RJ45 electric signal, HDMI digital signal；The type of every kind of signal has active and standby
Two interfaces.
As the preferred technical solution of the present invention, the control diverter module includes power divider and power amplifier；
The power divider is used to for input signal energy being divided into eight tunnels, and the power amplifier is for thermal compensation signal in signal branch
When caused by decay；The multiple-channel output module uses the passive low uniform bypass technology of phase difference of multichannel, can at most export eight
Road synchronization signal.
The present invention technical problem also to be solved is, provide it is a kind of i.e. safe and reliable and reduce cost based on
The fiber optic stretch of BD/GPS concentrates the time service method of time dissemination system.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: it should be concentrated based on the fiber optic stretch of BD and GPS
The time service method of time dissemination system, specifically includes the following steps:
(1) satellite-signal received is sent active time service host by BD/GPS antenna；
(2) the active time service host carries out the amplification, filtering or decaying of signal according to signal quality to it；
(3) treated signal, is decoded by decoder, parses time signal therein；Or it keeps receiving letter
Number parameter format, be directly output to power divider；
(4) power divider distributes time signal to most eight roads signal, and the signal after distribution passes through power amplification
Device is to improve signal strength；
(5) enhanced signal is transmitted through the optical fiber to baseband processing unit by the active time service host output end mouth
BBU is transferred to active time service allocation unit.
As the preferred technical solution of the present invention, the time service side of time dissemination system should be concentrated based on the fiber optic stretch of BD and GPS
Method is further comprising the steps of:
(6) when the fiber optic stretch based on BD and GPS concentrates time dissemination system to be equipped with the active time service allocation unit, then institute
After stating the signal that active time service allocation unit receives the active time service host transmission, by the power divider by the time
Signal distributes most eight roads signal, and the signal after distribution is by power amplifier to improve signal strength；
(7) signal of the active time service allocation unit is transmitted through the optical fiber to the baseband processing unit by output port
BBU。
Compared with prior art, which has the beneficial effect that the fiber optic stretch concentration based on BD and GPS is awarded
When system by equipment cascading, can at most simultaneously be 64 BBU time services, realize multiple BBU multiplexing antenna feeders, be greatly decreased
With location antenna amount, reducing the construction costs and difficulty of construction；It supports multiple system/frequency ranges simultaneously, improves the safety of time service,
BBU can also be supported to be randomly or based on certain strategy and select time dissemination system/frequency range；Improve the accuracy and safety of base station time service
Property.
Detailed description of the invention
It is further described with reference to the accompanying drawing with embodiments of the present invention:
Fig. 1 is current GPS satellite time dissemination system composed structure schematic diagram；
Fig. 2 is the structure chart that the fiber optic stretch based on BD and GPS concentrates time dissemination system；
Fig. 3 is inside the active time service host that the fiber optic stretch based on BD and GPS is concentrated in the time service method of time dissemination system
The schematic diagram of structure and signal flow；
Fig. 4 is the active time service allocation unit in the time service method of the fiber optic stretch concentration time dissemination system based on BD and GPS
The schematic diagram of internal structure and signal flow.
Specific embodiment
Embodiment: as shown in Fig. 2, should based on BD and GPS fiber optic stretch concentrate time dissemination system, including two BD/GPS days
Line, active time service host and an at least active time service allocation unit, the Beidou satellite navigation system BD antenna and the whole world are fixed
Position system GPS antenna is connected with the active time service host, and the active time service host and the active time service distribution are single
Member or/and baseband processing unit BBU are connected；The active time service host include CPU control module one, branch input module,
Self adaptive control amplification filtering and attenuation module, clock source module, BD/GPS source signal decoder module, branch output module and
Power management module one；The CPU control module one is used to send the control of control hardware setting and information processing to other modules
Information processed；The branch input module is for receiving the satellite-signal from satellite antenna；The self adaptive control amplification filtering
With attenuation module for amplifying, filtering or attenuation processing to input signal, to meet the BD/GPS source signal decoding
The amplitude range of module；The clock source input module is used to mention when BD/GPS signal is unable to reach the requirement of time service information source
For time synchronizing signal；The BD/GPS source signal decoder module is gone forward side by side horizontal lock for demodulating standard second signal, then to
The branch output module output includes at least the signal of standard clock signal；The branch output module is for replicating the volume
Code multiplexed signals is simultaneously output to baseband processing unit BBU or has the source time service allocation unit；The power management module one is used
In alternating current is become direct current with power supply to the device.Every active time service host is all configured with two-way BD/GPS dual mode reception mould
Block, stabilizing clock source input module, uses closed-loop control to keep time the taming constant-temperature crystal oscillator of technology to realize what high-precision was kept time all the way
The punctual clock source in inside, and using the power supply mode of dual power supply, improve reliability；The active time service allocation unit includes CPU
Control module two, input module, control diverter module, multiple-channel output module and power management module two, the CPU control module
Two for sending the control information of control hardware setting and information processing to other modules；The input module is used for receiving host
Or the output signal of higher level's allocation unit, it include two-way BD/GPS signal input interface；The control diverter module is for carrying out
The amplification and distribution of BD/GPS signal；The multiple-channel output module includes eight tunnel synchronization signal output interfaces, for exporting time service
Signal is to baseband processing unit BBU or junior's allocation unit；The power management module two is used to alternating current becoming direct current
With power supply to the device；The power management module one and the power management module two include two AC/DC conversion equipments；Institute
State the time signal that BD/GPS antenna receives big-dipper satellite BD and HA Global Positioning Satellite GPS；The BD/GPS antenna passes through feeder line
It is connected to the active time service host；The branch input module includes the antennal interface of two-way BD/GPS input, for accessing
Two-way BD/GPS dual mode reception antenna, and according to the quality of signal, decision uses the signal of BD or GPS as time service information source；
The clock source input module is run in 10~10 magnitude of high precision temperature compensation crystal oscillator frequency, and the time synchronization of output is made
Signal still ensures that certain accuracy；When external time reference signal, which receives, to be restored, highest priority is automatically switched to
Clock source enters normal condition work, and switching time is less than 10mS.It is punctual that clock source input module makes internal system have the time
Unit, when receiving BDS or GPS-time reference signal, host is synchronized by external reference signal；When not receiving external time
It when reference signal, is kept time by internal clocking, is run in internal 10~10 magnitude of high precision temperature compensation crystal oscillator frequency, make to export
Time synchronizing signal still ensure that certain accuracy；When external time reference signal, which receives, to be restored, automatically switch to excellent
The first highest clock source of grade enters normal condition work, and switching time is less than 10mS, and (switching time refers to normal outer from receiving
Portion's time reference signal restores the overall process time operated normally to completing to switch)；The input module for receiving host or
The output signal of higher level's allocation unit, the type of signal include SMA radiofrequency signal, RJ45 electric signal, HDMI digital signal；Every kind
The type of signal has active and standby two interfaces；The control diverter module includes power divider and power amplifier；The function
Rate distributor is used to for input signal energy being divided into eight tunnels, and the power amplifier is caused for thermal compensation signal in signal branch
Decaying；The multiple-channel output module uses the passive low uniform bypass technology of phase difference of multichannel, and it is synchronous can at most to export eight tunnels
Signal.
By adopting the above technical scheme, engineering construction difficulty and limited transmission distance are effectively solved using the method for fiber optic stretch
Problem, system equipment output information transmitted out by way of fiber optic stretch to the baseband processing unit BBU in computer room；It should
Fiber optic stretch based on BD and GPS concentrates time dissemination system to be transmitted using photoelectric mixed cable, can at least transmit one kilometer；Such as
Fruit can make fiber optic stretch to 20 kilometers by the way of taking electricity nearby, and fundamentally solving influences base because of limited transmission distance
Stand addressing the problem of；The fiber optic stretch based on BD and GPS concentrates time dissemination system by equipment cascading, can at most simultaneously be six
14 BBU time services realize multiple BBU multiplexing antenna feeders, same location antenna amount are greatly decreased, hardly possible of reducining the construction costs and construct
Degree；The second that the fiber optic stretch based on BD and GPS concentrates time dissemination system to send using Beidou satellite navigation system, GPS satellite is same
Signal and temporal information are walked, the clock synchronization work of the BBU of mobile communication base station is completed；It supports multiple system/frequency ranges simultaneously, improves
The safety of time service, additionally it is possible to BBU be supported to be randomly or based on certain strategy and select time dissemination system/frequency range；Intelligent monitor system is also
Two two-in-one BD/GPS antennas, GPS and Beidou signal, dual power supply can be monitored, when some antenna or power supply occur
When failure, it can be intelligently switched to another antenna or power supply, and local alarm is carried out by LED light, screen；System can
By dry contact, issues and alert to network management and monitoring system；System can simultaneously monitoring GPS and Beidou signal condition, in equipment screen
Relevant information is shown on curtain, and operation maintenance personnel is facilitated to understand signal condition；The fiber optic stretch based on BD and GPS concentrates time dissemination system
Realize that more BBU share time service using the active and standby BD/GPS time service antenna of two-way；The system is used by BD/GPS time service antenna, 1+1
Active and standby unit and allocation unit composition, or using the networkings configuration such as Ethernet and optical-fiber network, improve base station time service accuracy and
Safety.
As shown in figs. 34, should based on BD and GPS fiber optic stretch concentrate time dissemination system time service method, specifically include with
Lower step:
(1) satellite-signal received is sent active time service host by BD/GPS antenna；
(2) the active time service host carries out the amplification, filtering or decaying of signal according to signal quality to it；
(3) treated signal, is decoded by decoder, parses time signal therein；Or it keeps receiving letter
Number parameter format, be directly output to power divider；
(4) power divider distributes time signal to most eight roads signal, and the signal after distribution passes through power amplification
Device is to improve signal strength；
(5) enhanced signal is transmitted through the optical fiber to baseband processing unit by the active time service host output end mouth
BBU is transferred to active time service allocation unit.
(6) when the fiber optic stretch based on BD and GPS concentrates time dissemination system to be equipped with the active time service allocation unit, then institute
After stating the signal that active time service allocation unit receives the active time service host transmission, by the power divider by the time
Signal distributes most eight roads signal, and the signal after distribution is by power amplifier to improve signal strength；
(7) signal of the active time service allocation unit is transmitted through the optical fiber to the baseband processing unit by output port
BBU。
Embodiments of the present invention are described in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode, technical field those of ordinary skill within the scope of knowledge, present inventive concept can also not departed from
Under the premise of make a variety of changes.
Claims (10)
1. a kind of fiber optic stretch based on BD and GPS concentrates time dissemination system, which is characterized in that including at least one satellite antenna,
Active time service host and at least an active time service allocation unit, the satellite antenna are connected with the active time service host,
The active time service host is connected with the active time service allocation unit or/and baseband processing unit BBU.
2. the fiber optic stretch according to claim 1 based on BD and GPS concentrates time dissemination system, which is characterized in that described to have
Source time service host includes CPU control module one, branch input module, self adaptive control amplification filtering and attenuation module, clock source
Module, BD/GPS source signal decoder module, branch output module and power management module one；The CPU control module one is used
In the control information for sending control hardware setting and information processing to other modules；The branch input module comes from for receiving
The satellite-signal of the satellite antenna；The self adaptive control amplification filtering and attenuation module are for putting input signal
Greatly, filtering or attenuation processing, to meet the amplitude range of the BD/GPS source signal decoder module；The clock source inputs mould
Block is used to provide time synchronizing signal when BD/GPS signal is unable to reach the requirement of time service information source；The BD/GPS information source letter
Number decoder module is gone forward side by side horizontal lock for demodulating standard second signal, then includes at least standard to branch output module output
The signal of clock signal；The branch output module is for replicating the code multiplexing signal and being output to baseband processing unit
BBU has the source time service allocation unit；The power management module one is used to alternating current becoming direct current to supply to equipment
Electricity.
3. the fiber optic stretch according to claim 2 based on BD and GPS concentrates time dissemination system, which is characterized in that described to have
Source time service allocation unit includes CPU control module two, input module, control diverter module, multiple-channel output module and power management
Module two, the CPU control module two are used to send the control information of control hardware setting and information processing to other modules；Institute
Input module is stated for receiving host or the output signal of higher level's allocation unit, includes two-way BD/GPS signal input interface；Institute
State amplification and distribution that control diverter module is used to carry out BD/GPS signal；The multiple-channel output module includes eight tunnel synchronization signals
Output interface, for exporting time signal to baseband processing unit BBU or junior's allocation unit；The power management module two is used
In alternating current is become direct current with power supply to the device.
4. the fiber optic stretch according to claim 3 based on BD and GPS concentrates time dissemination system, which is characterized in that the electricity
Source control module one and the power management module two include two AC/DC conversion equipments.
5. the fiber optic stretch according to claim 3 based on BD and GPS concentrates time dissemination system, which is characterized in that described to defend
Star antenna is Beidou satellite navigation system and the two-in-one BD/GPS antenna of global positioning system；The BD/GPS antenna receives north
The time signal of bucket satellite BD and HA Global Positioning Satellite GPS；The BD/GPS antenna is connected to the active time service by feeder line
Host；The branch input module includes the antennal interface of two-way BD/GPS input, for accessing two-way BD/GPS dual mode reception
Antenna, and according to the quality of signal, decision uses the signal of BD or GPS as time service information source.
6. the fiber optic stretch according to claim 5 based on BD and GPS concentrates time dissemination system, which is characterized in that when described
Clock source input module is run in 10~10 magnitude of high precision temperature compensation crystal oscillator frequency, makes the time synchronizing signal of output still
It can guarantee certain accuracy；When external time reference signal, which receives, to be restored, the clock source of highest priority is automatically switched to
It works into normal condition, switching time is less than 10mS.
7. the fiber optic stretch according to claim 5 based on BD and GPS concentrates time dissemination system, which is characterized in that described defeated
Enter module for receiving host or the output signal of higher level's allocation unit, the type of signal includes SMA radiofrequency signal, RJ45 telecommunications
Number, HDMI digital signal；The type of every kind of signal has active and standby two interfaces.
8. the fiber optic stretch according to claim 5 based on BD and GPS concentrates time dissemination system, which is characterized in that the control
Diverter module processed includes power divider and power amplifier；The power divider is used to input signal energy being divided into eight
Road, the power amplifier are decayed caused by being used for thermal compensation signal in signal branch；The multiple-channel output module uses multichannel
The passive uniform bypass technology of low phase difference, can at most export eight tunnel synchronization signals.
9. a kind of fiber optic stretch according to claims 1-8 based on BD and GPS concentrates the time service method of time dissemination system, special
Sign is, specifically includes the following steps:
(1) satellite-signal received is sent active time service host by BD/GPS antenna；
(2) the active time service host carries out the amplification, filtering or decaying of signal according to signal quality to it；
(3) treated signal, is decoded by decoder, parses time signal therein；Or it keeps receiving signal
Parameter format is directly output to power divider；
(4) power divider distributes time signal to most eight roads signal, the signal after distribution by power amplifier with
Improve signal strength；
(5) enhanced signal by the active time service host output end mouth be transmitted through the optical fiber to baseband processing unit BBU or
It is transferred to active time service allocation unit.
10. the fiber optic stretch according to claim 9 based on BD and GPS concentrates the time service method of time dissemination system, feature
It is, the time service method of time dissemination system should be concentrated further comprising the steps of based on the fiber optic stretch of BD and GPS:
(6) when the fiber optic stretch based on BD and GPS concentrates time dissemination system to be equipped with the active time service allocation unit, then described to have
After source time service allocation unit receives the signal of the active time service host transmission, by the power divider by time signal
Most eight roads signal is distributed, the signal after distribution is by power amplifier to improve signal strength；
(7) signal of the active time service allocation unit is transmitted through the optical fiber to the baseband processing unit BBU by output port.
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| CN111123297A (en) * | 2019-12-13 | 2020-05-08 | 中航光电科技股份有限公司 | Remote system suitable for Beidou satellite navigation signals |
| CN111399003A (en) * | 2020-03-24 | 2020-07-10 | 中航光电科技股份有限公司 | Remote system of full-band satellite navigation signal |
| CN111736182A (en) * | 2020-07-28 | 2020-10-02 | 南京华苏科技有限公司 | Multi-path adjustable BDS/GPS time service device and time service method |
| CN113156464A (en) * | 2021-05-10 | 2021-07-23 | 深圳国人无线通信有限公司 | Synchronous time service conversion device and method |
| CN113885305A (en) * | 2021-09-10 | 2022-01-04 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Completely autonomous controllable rapid time frequency synchronization device and method |
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