CN109085615A - A kind of BPC big dipper multi-mode time service method and system - Google Patents
A kind of BPC big dipper multi-mode time service method and system Download PDFInfo
- Publication number
- CN109085615A CN109085615A CN201810865207.3A CN201810865207A CN109085615A CN 109085615 A CN109085615 A CN 109085615A CN 201810865207 A CN201810865207 A CN 201810865207A CN 109085615 A CN109085615 A CN 109085615A
- Authority
- CN
- China
- Prior art keywords
- time
- bpc
- signal
- time service
- mode
- 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.)
- Pending
Links
Classifications
-
- 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
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
-
- 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
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
Abstract
The present invention provides a kind of BPC big dipper multi-mode time service method and system, and method includes: to receive the BPC low frequency time signal that the BPC signal transmitting tower at national time service center is broadcast and the Beidou navigation signal that big-dipper satellite is sent；Judge whether received BPC low frequency time signal and Beidou navigation signal are normal, if Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is then selected to carry out time service, if BPC low frequency time signal is abnormal, big-dipper satellite time service mode is then selected to carry out time service, it selects BPC and Beidou dual-mode time service mode to carry out time service if normal, passes through Beidou positioning amendment BPC low-frequency time-code time service.The present invention provides a variety of time service modes, BPC low frequency time signal and Beidou navigation signal whether normally can select corresponding time service mode based on the received, BPC signal propagation delay time is corrected by Beidou positioning to provide high-precision time service, improves the flexibility and reliability of time service.
Description
Technical field
The invention mainly relates to Service of Timing process fields, and in particular to a kind of BPC big dipper multi-mode time service method and system.
Background technique
Time is the most basic physical quantity for characterizing the motion of matter, is an important component in development of human civilization,
Time is the physical quantity that accuracy highest is most widely used in current all physical quantitys.With Chinese national economy, national defense construction and
The development of space technology, to the accuracy of split-second precision frequency services, stability, reliability and it is round-the-clock be proposed it is more next
Higher requirement.Big-dipper satellite time service and BPC low-frequency time-code time service are currently used two kinds of time service modes, but just single at present
Time service mode have been unable to meet the requirement of user, the BPC low frequency time signal that BPC signal transmitting tower is broadcast is easy to be examined by shutdown
Repair, the influence of long transmission distance, weather, lead to abnormal signal, cause the time service of BPC low-frequency time-code can not accurately situation, Beidou
Satellite-signal be easy influenced by indoor environment, lead to abnormal signal, cause big-dipper satellite time service can not accurately situation, therefore
There is deficiencies in flexibility and reliability for single time service mode.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of BPC big dipper multi-mode time service
Method and system.
The technical scheme to solve the above technical problems is that a kind of BPC big dipper multi-mode time service method, including it is as follows
Step:
By BPC low frequency time signal that the BPC signal transmitting tower for receiving national time service center to time service terminal is broadcast with
And the Beidou navigation signal that big-dipper satellite is sent；
Judge whether received BPC low frequency time signal and Beidou navigation signal are normal,
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, when according to the BPC low frequency
Code time service mode carries out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, is awarded according to the big-dipper satellite
When mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to awarding to the selection of time service terminal
When mode carry out time service, if selecting BPC and Beidou dual-mode time service mode to the non-selected time service mode of time service terminal, according to
The BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
Another technical solution that the present invention solves above-mentioned technical problem is as follows: a kind of BPC big dipper multi-mode time dissemination system, packet
It includes:
Receiving module, the BPC for being broadcast by the BPC signal transmitting tower for receiving national time service center to time service terminal are low
The Beidou navigation signal that frequency time signal and big-dipper satellite are sent；
Signal processing module, for judging whether received BPC low frequency time signal and Beidou navigation signal are normal；
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, when according to the BPC low frequency
Code time service mode carries out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, is awarded according to the big-dipper satellite
When mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to awarding to the selection of time service terminal
When mode carry out time service, if selecting BPC and Beidou dual-mode time service mode to the non-selected time service mode of time service terminal, according to
The BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
It, being capable of BPC low frequency time signal and north based on the received the beneficial effects of the present invention are: provide a variety of time service modes
Whether bucket navigation signal normally selects corresponding time service mode, in BPC low frequency time signal and Beidou navigation signal normal
In the case where, time service, or BPC and Beidou dual-mode time service mode according to default can be carried out according to some selected time service mode
Time service is carried out, the flexibility and reliability of time service are improved.
Detailed description of the invention
Fig. 1 is the method flow diagram for the BPC big dipper multi-mode time service method that one embodiment of the invention provides；
Fig. 2 is the module frame chart for the BPC big dipper multi-mode time dissemination system that one embodiment of the invention provides；
Fig. 3 be another embodiment of the present invention provides BPC big dipper multi-mode time dissemination system module frame chart；
Fig. 4 be another embodiment of the present invention provides BPC big dipper multi-mode time service method method flow diagram；
Fig. 5 is the schematic diagram for the time-code information coding that one embodiment of the invention provides；
Fig. 6 is that the signal that one embodiment of the invention provides transmits schematic diagram.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Fig. 1 is the method flow diagram for the BPC big dipper multi-mode time service method that one embodiment of the invention provides；
As shown in Figure 1, a kind of BPC big dipper multi-mode time service method, includes the following steps:
By BPC low frequency time signal that the BPC signal transmitting tower for receiving national time service center to time service terminal is broadcast with
And the Beidou navigation signal that big-dipper satellite is sent；
Judge whether received BPC low frequency time signal and Beidou navigation signal are normal；
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, when according to the BPC low frequency
Code time service mode carries out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, is awarded according to the big-dipper satellite
When mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to awarding to the selection of time service terminal
When mode carry out time service, if selecting BPC and Beidou dual-mode time service mode to the non-selected time service mode of time service terminal, according to
The BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
In above-described embodiment, a variety of time service modes are provided, it being capable of BPC low frequency time signal and Beidou navigation based on the received
Whether signal normally selects corresponding time service mode, in the situation that BPC low frequency time signal and Beidou navigation signal are normal
Under, time service can be carried out according to some selected time service mode, or awarded with Beidou dual-mode time service mode according to the BPC of default
When, improve the flexibility and reliability of time service.
Optionally, as an embodiment of the present invention, time service, tool are carried out according to the BPC low-frequency time-code time service mode
Body are as follows:
The BPC low frequency time signal is parsed to obtain time-code information, calculates the biography of the BPC low frequency time signal
Defeated time delay Δ τ 1, according to local zone time described in propagation delay time Δ τ 1 and the time-code Information revision, to complete time service.
BPC low-frequency time-code time service mode only directly carries out time synchronization to local zone time in time service at present, since BPC is low
Frequency time signal is transmitted to when time service terminal that there are propagation delay times, and it is inaccurate that the propagation delay time of generation will cause the time service time
The case where, and in the present embodiment, when synchronous to local zone time, calculate the propagation delay time of BPC low frequency time signal and combine time-code
The time service mode of Information revision local zone time greatlys improve the precision of time service.
Optionally, as an embodiment of the present invention, the propagation delay time Δ for calculating the BPC low frequency time signal
τ 1, it is synchronous with propagation delay time Δ τ 1 according to the time-code information and correct the local zone time, so that time service is completed, specifically:
By local zone time described in the time-code synchronizing information, and according to time service terminal and BPC signal transmitting tower away from
The propagation delay time Δ τ 1 is calculated from value Δ D1, and records in advance or lag behind the sampling instant TJThe BPC low frequency award
When signal failing edge moment TC, calculate the sampling instant TJWith failing edge moment TCTime interval Δ t, due to Δ t=1/
F, wherein f is sample frequency, and to pulse per second (PPS) waveform phase shift, the 1PPS signal of output is adjusted according to the pulse per second (PPS) waveform after phase shift,
So that 1PPS signal and BPC low frequency time signal is declined delay and carves TCIt is synchronous, local zone time is repaired according to propagation delay time Δ τ 1
Just, to keep local zone time synchronous with the UTC Coordinated Universal Time(UTC).1PPS is pulse per second signal, 1PPS=1 second arteries and veins
Punching/second.
In above-described embodiment, the 1PPS (pulse per second) of output, 1PPS=1 second arteries and veins are adjusted by phase shift
Punching/second makes itself and BPC signal failing edge moment TCIt is synchronous；The time-code information be year, month, day, hour, min, the data of second, this
Time-code information delay BPC signal failing edge Δ τ 1, and round up in seconds several N to Δ τ 1, this time-code information is added N seconds
Amendment, at the beginning of next whole second plus N seconds export.
In above-described embodiment, using rear modified mode is first synchronized, the accuracy of time service is improved, in big-dipper satellite time service mould
When formula breaks down, BPC low-frequency time-code time service mode adaptively can be used, improve the reliability and accuracy of system.
Optionally, as an embodiment of the present invention, distance of the basis to time service terminal and BPC signal transmitting tower
It is worth Δ D1 and calculates the propagation delay time Δ τ 1, specifically:
The geographical coordinate (X, Y, Z) and BPC signal transmitting tower to time service terminal are obtained from data center's pre-stored data
Geographical coordinate (X0, Y0, Z0), and bring calculating distance value Δ D1 in following equation into:
And the propagation delay time Δ τ 1 is calculated according to distance value Δ D1 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant, receiving error constant can lead to
Preset error model is crossed to correct to obtain.
In above-described embodiment, using prestoring to the geographical coordinate of time service terminal and the geographical coordinate of BPC signal transmitting tower
Propagation delay time is calculated, corrects local zone time using propagation delay time, to improve accuracy.
It is optionally, as an embodiment of the present invention, described that time service is carried out according to BPC and Beidou dual-mode time service mode,
Specifically:
The BPC low frequency time signal is parsed to obtain time-code information, is waited for according to the Beidou navigation signal framing
Time service terminal calculates the distance value Δ D2 to time service terminal and BPC signal transmitting tower, is calculated and is transmitted according to the distance value Δ D2
Time delay Δ τ 2, according to local zone time described in propagation delay time Δ τ 2 and the time-code Information revision, to complete time service.
It in above-described embodiment, is positioned by the Beidou navigation signal of big-dipper satellite to time service terminal, to be transmitted
Time delay is positioned to correct propagation delay time caused by BPC low-frequency time-code time service mode using Beidou, makes the numerical value of propagation delay time
It is more acurrate, to improve time service precision, meet the high-precision requirement of Time synchronization technique.
Fig. 5 is the schematic diagram for the time-code information coding that one embodiment of the invention provides；
Specifically, most common time-code information is encoded to, as shown in Figure 5:
BPC low frequency time signal, while modulation amplitude and pulse width, provide digitized temporal information, encoded signal
The frame period be 20s, per minute send out 3 frames, using quaternary pulse width modulating-coding；I.e. on the carrier wave of 68.5kHz, every 1s
Start time falls to the 109% of reference amplitude under carrier amplitude, forms drop pulse, fall pulse width 0.1s, 0.2s,
0.3s, 0.4s correspond respectively to number 0,1,2,3.It is assigned on the position of different seconds (moment) of the pulse in 1min different
Temporal information and relevant coding check information.PO setting indicates in 0s, 20s, 40s for pulse per second (PPS) missing, and separates adjacent
Frame has also predicted the starting of lower 1 frame；P1 is flag of frame, and P1=0 indicates that the frame starts from 1s, and P1=1 indicates that the frame starts from
21s, PI1=2 indicate that the frame starts from 41s；P2 is reserved place, expands information when for needing: P3 is check bit, with " morning "
" afternoon " label multiplex；P4 is also check bit, also the highest bit multiplex with " year ".The starting point of amplitude-modulated pulse failing edge, instruction
National time service center UTC (NTSC) moment second, amplitude-modulated pulse coding protocol provide date and TOD temporal information.According to above-mentioned volume
Code is parsed.
Optionally, as an embodiment of the present invention, described that time service terminal is waited for according to Beidou navigation signal framing, it calculates
To the distance value Δ D2 of time service terminal and BPC signal transmitting tower, propagation delay time Δ τ 2 is calculated according to the distance value Δ D2, specifically
Are as follows:
Analog if signal is converted to after the Beidou navigation signal is carried out signal amplification, by the analog if signal
Digital baseband signal is converted to, then the digital baseband signal is filtered, obtains parameter, the parameter is subjected to PN code phase
Position processing, by treated parameter the carries out despreading processing of PN code phase, and will despreading treated that parameter decodes, led
It navigates data, the navigation data is subjected to frame decoding processing, frame decoding treated navigation data carries out solution text processing is defended
Star textual information obtains the geographical coordinate (X1, Y1, Z1) to time service terminal according to the satellite message information, and will obtain
The geographical coordinate uploads location information of data center's update to time service terminal；
By the geographical coordinate of the geographical coordinate (X1, Y1, Z1) and BPC signal transmitting tower to time service terminal (X0, Y0,
Z0 calculating distance value Δ D2 in following equation) is brought into:
And the propagation delay time Δ τ 2 is calculated according to distance value Δ D2 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant.
Specifically, in above-described embodiment, it is further comprising the steps of after the Beidou navigation signal progress signal amplification, it will put
The Beidou navigation signal after big successively carries out down coversion, filtering and main intermediate frequency enhanced processing, then passes through AGC control processor
The main amplified Beidou of intermediate frequency of (AGC, Automatic Generation Control Automatic Generation Control processor) processing is led
Boat signal obtains analog if signal, and is converted to digital medium-frequency signal by A/D sampling A/D chip, then by digital medium-frequency signal
It carries out orthogonal digital down coversion and obtains digital baseband signal, digital baseband signal includes multiple wave beams, and multiple wave beams are carried out ring
Road filtering, obtains parameter.
Specifically, it is described will despreading treated that parameter decodes, decoded especially by Viterbi algorithm, then carry out
CRC check correctly extracts navigation data.
Optionally, as an embodiment of the present invention, time service is carried out according to the big-dipper satellite time service mode, specifically
Are as follows: it is tamed by parsing obtained data and NCO (NCO, numerically controlled oscillator) method
The markers and calculated time delay that local crystal oscillator recovers complete timing function.
Specifically, the local crystal oscillator is constant-temperature crystal oscillator, constant-temperature crystal oscillator exports frequency point required for Beidou and BPC time service,
Clock signal is provided simultaneously and adjusts the fine tuning for realizing frequency by external voltage.
Specifically, passing through formula τdelay=τup+τdown+τotherCarry out calculation delay,
Wherein, τupThe time delay for being signal from earth station to satellite, obtains from navigation message；τdownIt is defended for signal from Beidou
Time delay of the star to receiver；
Satellite position is (XS, YS, ZS), to time service terminal real-time position information (X, Y, Z), v is that Beidou signal propagates speed
Degree.
Wherein,
τotherFor other time delays, time delay amendment and the Time Delay of Systems of propagation are specifically included, the time delay amendment of propagation can pass through
Radio wave propagation correction model parameter obtains in navigation message, and Time Delay of Systems includes that device forwards time delay and receiver time delay etc. can lead to
SYSTEM ERROR MODEL is crossed to obtain.
Since the time service principle of big-dipper satellite time service mode is the prior art, the present invention is repeated no more.
Optionally, as an embodiment of the present invention, further include the steps that exporting the temporal information after time service,
Generate corresponding temporal information according to the time format that is arranged to time service terminal and export, temporal information include 1PPS signal and
UTC standard time message information.
Fig. 2 is the module frame chart for the BPC big dipper multi-mode time dissemination system that one embodiment of the invention provides；
Optionally, as another embodiment of the invention, as shown in Fig. 2, a kind of BPC big dipper multi-mode time dissemination system, packet
It includes:
Receiving module, the BPC for being broadcast by the BPC signal transmitting tower for receiving national time service center to time service terminal are low
The Beidou navigation signal that frequency time signal and big-dipper satellite are sent；
Signal processing module, for judging whether received BPC low frequency time signal and Beidou navigation signal are normal；
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, when according to the BPC low frequency
Code time service mode carries out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, is awarded according to the big-dipper satellite
When mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to awarding to the selection of time service terminal
When mode carry out time service, if selecting BPC and Beidou dual-mode time service mode to the non-selected time service mode of time service terminal, according to
The BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
Specifically, the receiving module includes BPC receiving unit and Beidou receiving unit,
The BPC receiving unit, for obtaining to the received BPC low frequency time signal of time service terminal；
The Beidou receiving unit, for obtaining to the received Beidou navigation signal of time service terminal.
Fig. 6 is that the signal that one embodiment of the invention provides transmits schematic diagram；
To time service terminal concretely electronic equipment, the signal from big-dipper satellite and BPC signal transmitting tower can receive, and
Beidou navigation signal and BPC low frequency time signal are transmitted to BPC big dipper multi-mode time dissemination system, BPC big dipper multi-mode time dissemination system
Beidou navigation signal and BPC low frequency time signal are handled, time service terminal is treated according to the data that processing obtains and is awarded
When.
It, can be more by BPC Beidou in view of BPC big dipper multi-mode time dissemination system and to the signal propagation delay time between time service terminal
Mould time dissemination system is arranged with to time service terminal in local, this BPC big dipper multi-mode time dissemination system can also be integrated in time service terminal
In.
Optionally, as an embodiment of the present invention, the signal processing module is specifically used for:
The BPC low frequency time signal is parsed to obtain time-code information, calculates the biography of the BPC low frequency time signal
Defeated time delay Δ τ 1, according to local zone time described in propagation delay time Δ τ 1 and the time-code Information revision, to complete time service.
Fig. 3 is the module frame chart for the BPC big dipper multi-mode time dissemination system that one embodiment of the invention provides；
As shown in figure 3, specifically, the signal processing module specifically includes FPGA processing unit and DSP processing unit:
The FPGA processing unit is used for, and is parsed to obtain time-code information to the BPC low frequency time signal, passes through institute
State local zone time described in time-code synchronizing information；
The DSP processing unit is used for, according to the distance value Δ D1 calculating to time service terminal and BPC signal transmitting tower
Propagation delay time Δ τ 1, and record in advance or lag behind the sampling instant TJThe BPC low frequency time signal failing edge when
Carve TC, calculate the sampling instant TJWith failing edge moment TCTime interval Δ t, and according to time interval Δ t to pulse per second (PPS) wave
Shape phase shift makes under 1PPS signal and BPC low frequency time signal according to the 1PPS signal of the pulse per second (PPS) waveform adjustment output after phase shift
T is carved in drop delayCIt is synchronous, local zone time is modified according to propagation delay time Δ τ 1, so that local zone time and UTC be made to coordinate the world
When it is synchronous.
As shown in figure 3, optional, as an embodiment of the present invention, this time dissemination system further includes ARM main control module,
The ARM main control module is connect with data center；
Specifically, in the DSP processing unit, distance value Δ of the basis to time service terminal and BPC signal transmitting tower
D1 calculates the propagation delay time Δ τ 1, specifically:
DSP processing unit is connect with ARM main control module, through the ARM main control module from data center's pre-stored data
It obtains to the geographical coordinate (X, Y, Z) of time service terminal and the geographical coordinate (X0, Y0, Z0) of BPC signal transmitting tower, carries it into down
Distance value Δ D1 is calculated in column formula:
And the propagation delay time Δ τ 1 is calculated according to distance value Δ D1 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant, receives error constant and pass through
Preset error model is corrected to obtain.
Optionally, as an embodiment of the present invention, the signal processing module also particularly useful for:
The BPC low frequency time signal is parsed to obtain time-code information, is waited for according to the Beidou navigation signal framing
Time service terminal calculates the distance value Δ D2 to time service terminal and BPC signal transmitting tower, is calculated and is transmitted according to the distance value Δ D2
Time delay Δ τ 2, according to local zone time described in propagation delay time Δ τ 2 and the time-code Information revision, to complete time service.
Optionally, as an embodiment of the present invention, the FPGA processing unit also particularly useful for,
Analog if signal is converted to after the Beidou navigation signal is carried out signal amplification, by the analog if signal
Digital baseband signal is converted to, then the digital baseband signal is filtered, obtains parameter, the parameter is subjected to PN code phase
Position processing, by treated parameter the carries out despreading processing of PN code phase, and will despreading treated that parameter decodes, led
It navigates data, the navigation data is subjected to frame decoding processing, frame decoding treated navigation data carries out solution text processing is defended
Star textual information obtains the geographical coordinate (X1, Y1, Z1) to time service terminal according to the satellite message information, and will obtain
The geographical coordinate uploads location information of data center's update to time service terminal；
The DSP processing unit is also particularly useful for by the geographical coordinate (X1, Y1, Z1) to time service terminal and BPC letter
The geographical coordinate (X0, Y0, Z0) of number launching tower brings calculating distance value Δ D2 in following equation into:
And the propagation delay time Δ τ 2 is calculated according to distance value Δ D2 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant.
The FPGA processing unit and DSP processing unit pass through EMIF data-interface transmission data.
Optionally, as an embodiment of the present invention, this time dissemination system further includes RTC block, RTC Real-Time
Clock real-time clock, the RTC block and signal processing module are used to carry out power-off protection to signal processing module；RTC
Module can still realize clock count under power blackout situation, provide temporal information to power on next time.
As shown in figure 3, optional, as an embodiment of the present invention, this time dissemination system further includes power module, described
Power module is connect with the receiving module, signal processing module and ARM main control module, is used for the receiving module, letter
Number processing module and ARM main control module provide electric power.
It optionally, as an embodiment of the present invention, further include the output module for exporting the temporal information after time service,
The output module is connect with the ARM main control module；The ARM main control module receives the time format being arranged to time service terminal
Information generates corresponding temporal information according to the time format of input and sends the output module, the output module by when
Between information export, the temporal information includes 1pps signal and UTC standard time message information.
The present invention can flexibly switch three kinds of time service modes according to their needs, when BPC low frequency time signal and Beidou navigation
In the normal situation of signal, the ARM main control module receives the selection information of the time service mode sent to time service terminal, according to
The selection information selects corresponding time service mode to carry out time service, if to the not set time service mode of time service terminal, BPC and Beidou
Bimodulus time service mode is the time service mode of default.
Fig. 4 be another embodiment of the present invention provides BPC big dipper multi-mode time service method method flow diagram；
It is illustrated below by the example of a time service model selection, as shown in Figure 4:
201. starting；
202. receive BPC low frequency time signal and Beidou navigation signal；
203. judge whether BPC low frequency time signal and Beidou navigation signal are all normal, if the Beidou navigation signal
Exception thens follow the steps 204；If the BPC low frequency time signal thens follow the steps 205 extremely；If both normal,
Time service is carried out according to the time service mode selected to time service terminal, executes step 2061 or step 2062 or step 2063, if to
The non-selected time service mode of time service terminal, then defaulting time service mode is BPC and Beidou dual-mode time service mode, executes step 2061；
204. Beidou navigation abnormal signals execute step 2061；
205.BPC low frequency time signal is abnormal, executes rapid 2062；
2061. selection BPC low-frequency time-code time service modes, i.e. mode one, carry out according to the BPC low-frequency time-code time service mode
Time service；
2062. selection big-dipper satellite time service modes, i.e. mode two, carry out time service according to the big-dipper satellite time service mode；
2063. selection BPC and Beidou dual-mode time service mode, i.e. mode three, according to the BPC and Beidou dual-mode time service mode
Time service is carried out, and executes step 20611；
20611. pairs of BPC low frequency time signals are parsed to obtain time-code information, and are believed according to the Beidou navigation
Number positioning calculates the transmission range Δ D2 to time service terminal and the BPC low frequency time signal, according to the biography to time service terminal
Defeated distance, delta D2 calculates propagation delay time Δ τ 2, synchronous with propagation delay time Δ τ 2 according to the time-code information and when correcting described local
Between；
207. outputting standard temporal informations.
The present invention has following advantages:
1, reliability improves: can adaptively use Beidou time service in the daily maintenance down of BPC broadcasting system；In BPC
Or automatically switch time service mode in the case where Beidou failure, it still is able to provide split-second precision frequency standard for user,
To substantially increase the reliability of system, the requirement of Time synchronization technique high reliability is met；
2, precision improves: with the increase of BPC time service distance, also increased with it by the caused time delay of signal transmission, this
The method and system of invention position to correct propagation delay time caused by BPC time service using Beidou, substantially increase time service precision,
Meet the high-precision requirement of Time synchronization technique；
3, flexibility improves: with the fast development of Service of Timing, time service terminal device emerges one after another, and user is not appointing
What can flexibly switch three kinds of time service modes according to their needs in the case where replacing, user experience also obtains while flexibility improves
Improvement is arrived；
4, discretionary security improves: type system and method for the present invention is the base in the timing and navigation system of China's independent research
It develops and proposes on plinth, the research of this clock synchronization system and method will eliminate the U.S. in this technical aspect to us
Time safety so that the potential grave danger of national security.
It is apparent to those skilled in the art that for convenience of description and succinctly, the dress of foregoing description
The specific work process with unit is set, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.
Unit may or may not be physically separated as illustrated by the separation member, shown as a unit
Component may or may not be physical unit, it can and it is in one place, or may be distributed over multiple networks
On unit.It can select some or all of unit therein according to the actual needs to realize the mesh of the embodiment of the present invention
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, is also possible to two or more units and is integrated in one unit.It is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.
It, can if integrated unit is realized in the form of SFU software functional unit and when sold or used as an independent product
To be stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention substantially or
Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products
Out, which is stored in a storage medium, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes all or part of each embodiment method of the present invention
Step.And storage medium above-mentioned include: USB flash disk, it is mobile hard disk, read-only memory (ROM, Read-Only Memory), random
Access various Jie that can store program code such as memory (RAM, Random Access Memory), magnetic or disk
Matter.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be wanted with right
Subject to the protection scope asked.
Claims (10)
1. a kind of BPC big dipper multi-mode time service method, which comprises the steps of:
The BPC low frequency time signal broadcast by the BPC signal transmitting tower for receiving national time service center to time service terminal and north
The Beidou navigation signal that the satellite that struggles against is sent；
Judge whether received BPC low frequency time signal and Beidou navigation signal are normal；
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, is awarded according to the BPC low-frequency time-code
When mode carry out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, according to the big-dipper satellite time service mould
Formula carries out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to the time service mould to the selection of time service terminal
Formula carries out time service, if BPC and Beidou dual-mode time service mode are selected, according to described to the non-selected time service mode of time service terminal
BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
2. BPC big dipper multi-mode time service method according to claim 1, which is characterized in that awarded according to the BPC low-frequency time-code
When mode carry out time service, specifically:
The BPC low frequency time signal is parsed to obtain time-code information, when calculating the transmission of the BPC low frequency time signal
Prolong Δ τ 1, it is synchronous with propagation delay time Δ τ 1 according to the time-code information and correct the local zone time, to complete time service.
3. BPC big dipper multi-mode time service method according to claim 2, which is characterized in that
The propagation delay time Δ τ 1 for calculating the BPC low frequency time signal, according to the time-code information and propagation delay time Δ τ 1
The local zone time is synchronized and corrects, specifically:
By local zone time described in the time-code synchronizing information, and according to the distance value to time service terminal and BPC signal transmitting tower
Δ D1 calculates the propagation delay time Δ τ 1, and records in advance or lag behind the sampling instant TJThe BPC low frequency time service letter
Number failing edge moment TC, calculate the sampling instant TJWith failing edge moment TCTime interval Δ t, and according to time interval
Δ t makes 1PPS signal and BPC according to the 1PPS signal of the pulse per second (PPS) waveform adjustment output after phase shift to pulse per second (PPS) waveform phase shift
T is carved in the decline delay of low frequency time signalCIt is synchronous, local zone time is modified according to propagation delay time Δ τ 1, thus when making local
Between it is synchronous with the UTC Coordinated Universal Time(UTC).
4. BPC big dipper multi-mode time service method according to claim 3, which is characterized in that the basis to time service terminal and
The distance value Δ D1 of BPC signal transmitting tower calculates the propagation delay time Δ τ 1, specifically:
The geography of geographical coordinate (X, Y, the Z) and BPC signal transmitting tower to time service terminal are obtained from data center's pre-stored data
Coordinate (X0, Y0, Z0), and bring calculating distance value Δ D1 in following equation into:
And the propagation delay time Δ τ 1 is calculated according to distance value Δ D1 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant.
5. BPC big dipper multi-mode time service method according to claim 1, which is characterized in that described according to BPC and Beidou bimodulus
Time service mode carries out time service, specifically:
The BPC low frequency time signal is parsed to obtain time-code information, time service is waited for according to the Beidou navigation signal framing
Terminal calculates the distance value Δ D2 to time service terminal and BPC signal transmitting tower, calculates propagation delay time according to the distance value Δ D2
Δ τ 2, it is synchronous with propagation delay time Δ τ 2 according to the time-code information and correct the local zone time, to complete time service.
6. BPC big dipper multi-mode time service method according to claim 5, which is characterized in that described according to Beidou navigation signal
Positioning calculates the distance value Δ D2 to time service terminal and BPC signal transmitting tower to time service terminal, is counted according to the distance value Δ D2
Propagation delay time Δ τ 2 is calculated, specifically:
Analog if signal is converted to after the Beidou navigation signal is carried out signal amplification, the analog if signal is converted
For digital baseband signal, then the digital baseband signal is filtered, obtains parameter, the parameter is carried out at PN code phase
Reason, by treated parameter the carries out despreading processing of PN code phase, and will despreading treated that parameter decodes, obtain navigation number
According to the navigation data is carried out frame decoding processing, by frame decoding treated navigation data carries out solution text processing, obtains satellite electricity
Literary information obtains the geographical coordinate (X1, Y1, Z1) to time service terminal according to the satellite message information, and described in obtaining
Geographical coordinate uploads location information of data center's update to time service terminal；
By geographical coordinate (X0, Y0, Z0) band of the geographical coordinate (X1, Y1, Z1) and BPC signal transmitting tower to time service terminal
Enter calculating distance value Δ D2 in following equation:
And the propagation delay time Δ τ 2 is calculated according to distance value Δ D2 and BPC the low frequency time signal transmission speed:
Wherein, c is the transmission speed of BPC low frequency time signal, δ tuTo receive error constant.
7. a kind of BPC big dipper multi-mode time dissemination system characterized by comprising
Receiving module, the BPC low frequency for being broadcast by the BPC signal transmitting tower for receiving national time service center to time service terminal are awarded
When signal and big-dipper satellite send Beidou navigation signal；
Signal processing module, for judging whether received BPC low frequency time signal and Beidou navigation signal are normal；
If the Beidou navigation abnormal signal, BPC low-frequency time-code time service mode is selected, is awarded according to the BPC low-frequency time-code
When mode carry out time service,
If the BPC low frequency time signal is abnormal, big-dipper satellite time service mode is selected, according to the big-dipper satellite time service mould
Formula carries out time service,
If the BPC low frequency time signal and Beidou navigation signal are normal, according to the time service mould to the selection of time service terminal
Formula carries out time service, if BPC and Beidou dual-mode time service mode are selected, according to described to the non-selected time service mode of time service terminal
BPC and Beidou dual-mode time service mode carry out time service,
If the BPC low frequency time signal and Beidou navigation signal are abnormal, alert.
8. BPC big dipper multi-mode time dissemination system according to claim 7, which is characterized in that the signal processing module is specific
For:
The BPC low frequency time signal is parsed to obtain time-code information, when calculating the transmission of the BPC low frequency time signal
Prolong Δ τ 1, according to local zone time described in propagation delay time Δ τ 1 and the time-code Information revision, to complete time service.
9. BPC big dipper multi-mode time dissemination system according to claim 8, which is characterized in that the signal processing module is specific
For:
By local zone time described in the time-code synchronizing information, and according to the distance value to time service terminal and BPC signal transmitting tower
Δ D1 calculates the propagation delay time Δ τ 1, and records in advance or lag behind the sampling instant TJThe BPC low frequency time service letter
Number failing edge moment TC, calculate the sampling instant TJWith failing edge moment TCTime interval Δ t, and according to time interval
1PPS signal and BPC low frequency are made according to the 1PPS signal of the pulse per second (PPS) waveform adjustment output after phase shift to pulse per second (PPS) waveform phase shift
T is carved in time signal decline delayCIt is synchronous, local zone time is modified according to propagation delay time Δ τ 1, thus make local zone time with
The UTC Coordinated Universal Time(UTC) is synchronous.
10. BPC big dipper multi-mode time dissemination system according to claim 7, which is characterized in that the signal processing module also has
Body is used for:
The BPC low frequency time signal is parsed to obtain time-code information, and waits awarding according to the Beidou navigation signal framing
When terminal, calculate distance value Δ D2 to time service terminal and BPC signal transmitting tower, calculated according to the distance value Δ D2 when transmitting
Prolong Δ τ 2, it is synchronous with propagation delay time Δ τ 2 according to the time-code information and correct the local zone time, to complete time service.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865207.3A CN109085615A (en) | 2018-08-01 | 2018-08-01 | A kind of BPC big dipper multi-mode time service method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865207.3A CN109085615A (en) | 2018-08-01 | 2018-08-01 | A kind of BPC big dipper multi-mode time service method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109085615A true CN109085615A (en) | 2018-12-25 |
Family
ID=64831250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810865207.3A Pending CN109085615A (en) | 2018-08-01 | 2018-08-01 | A kind of BPC big dipper multi-mode time service method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109085615A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613818A (en) * | 2018-12-29 | 2019-04-12 | 广西电网有限责任公司南宁供电局 | Time service method and system, storage medium and electronic equipment based on big-dipper satellite |
| CN111090234A (en) * | 2019-12-30 | 2020-05-01 | 郑州威科姆华大北斗导航科技有限公司 | Satellite anti-spoofing processing method and system based on time synchronization device |
| CN112468254A (en) * | 2020-12-02 | 2021-03-09 | 中国工程物理研究院电子工程研究所 | Reconfigurable distributed node high-precision time service synchronization system and method |
| CN113075699A (en) * | 2021-03-23 | 2021-07-06 | 广东工业大学 | 5G gateway multi-mode composite high-precision time service method and system |
| CN113872720A (en) * | 2021-10-11 | 2021-12-31 | 中国科学院国家授时中心 | Secret-related network time synchronization system and time service method |
| CN116614422A (en) * | 2023-07-17 | 2023-08-18 | 中能国研(北京)信息通信科技有限公司 | Beidou time service protocol safety analysis method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050118977A1 (en) * | 2003-12-02 | 2005-06-02 | Drogi Serge F. | Method, apparatus, and systems for digital radio communication systems |
| CN102156289A (en) * | 2011-03-09 | 2011-08-17 | 陕西诺维信息技术有限公司 | Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite |
| CN102305933A (en) * | 2011-08-17 | 2012-01-04 | 北斗天汇（北京）科技有限公司 | Beidou GPS (Global Positioning System) dual-mode time service receiving equipment and control method |
| 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 |
| CN202870485U (en) * | 2012-12-20 | 2013-04-10 | 中国科学院国家授时中心 | Time-service signal-receiving full-automatic selection apparatus |
| CN103513259A (en) * | 2013-09-21 | 2014-01-15 | 江西车仆电子智能科技有限公司 | Dual-mode positioning and timing system |
| CN207612450U (en) * | 2017-11-14 | 2018-07-13 | 河北智达光电科技股份有限公司 | From time service intelligent multichannel time switch |
-
2018
- 2018-08-01 CN CN201810865207.3A patent/CN109085615A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050118977A1 (en) * | 2003-12-02 | 2005-06-02 | Drogi Serge F. | Method, apparatus, and systems for digital radio communication systems |
| CN102156289A (en) * | 2011-03-09 | 2011-08-17 | 陕西诺维信息技术有限公司 | Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite |
| CN102305933A (en) * | 2011-08-17 | 2012-01-04 | 北斗天汇（北京）科技有限公司 | Beidou GPS (Global Positioning System) dual-mode time service receiving equipment and control method |
| 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 |
| CN202870485U (en) * | 2012-12-20 | 2013-04-10 | 中国科学院国家授时中心 | Time-service signal-receiving full-automatic selection apparatus |
| CN103513259A (en) * | 2013-09-21 | 2014-01-15 | 江西车仆电子智能科技有限公司 | Dual-mode positioning and timing system |
| CN207612450U (en) * | 2017-11-14 | 2018-07-13 | 河北智达光电科技股份有限公司 | From time service intelligent multichannel time switch |
Non-Patent Citations (1)
| Title |
|---|
| 刘小花等: "基于FPGA的便携式BPC定时接收机设计", 《时间频率学报》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613818A (en) * | 2018-12-29 | 2019-04-12 | 广西电网有限责任公司南宁供电局 | Time service method and system, storage medium and electronic equipment based on big-dipper satellite |
| CN111090234A (en) * | 2019-12-30 | 2020-05-01 | 郑州威科姆华大北斗导航科技有限公司 | Satellite anti-spoofing processing method and system based on time synchronization device |
| CN111090234B (en) * | 2019-12-30 | 2022-02-15 | 郑州威科姆华大北斗导航科技有限公司 | Satellite anti-spoofing processing method based on time synchronization device |
| CN112468254A (en) * | 2020-12-02 | 2021-03-09 | 中国工程物理研究院电子工程研究所 | Reconfigurable distributed node high-precision time service synchronization system and method |
| CN113075699A (en) * | 2021-03-23 | 2021-07-06 | 广东工业大学 | 5G gateway multi-mode composite high-precision time service method and system |
| CN113075699B (en) * | 2021-03-23 | 2023-08-08 | 广东工业大学 | Multi-mode composite high-precision time service method and system for 5G gateway |
| CN113872720A (en) * | 2021-10-11 | 2021-12-31 | 中国科学院国家授时中心 | Secret-related network time synchronization system and time service method |
| CN116614422A (en) * | 2023-07-17 | 2023-08-18 | 中能国研(北京)信息通信科技有限公司 | Beidou time service protocol safety analysis method |
| CN116614422B (en) * | 2023-07-17 | 2023-09-29 | 中能国研(北京)信息通信科技有限公司 | Beidou time service protocol safety analysis method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109085615A (en) | A kind of BPC big dipper multi-mode time service method and system | |
| CN104570021B (en) | GPS simulation method and system based on positioning and time service of Beidou satellite | |
| KR100902601B1 (en) | Wireless Time System And Method for Synchronizing Time | |
| EP2469765A1 (en) | Method and system for implementing time synchronization in local area network (lan) | |
| US5859595A (en) | System for providing paging receivers with accurate time of day information | |
| CN111092688B (en) | Time calibration method and device and terminal equipment | |
| CN101770016B (en) | GPS time service signal generator based on Beidou satellite | |
| JP2008170231A (en) | Time correction apparatus, timer device equipped with the same, and time correction method | |
| CN111954295B (en) | Time and precision considered synchronization maintaining method and system for TDD-LTE (time division Duplex-Long term evolution) equipment | |
| WO2020043181A1 (en) | Clock synchronization method and apparatus, system, storage medium, and electronic device | |
| CN202257089U (en) | Time synchronization device | |
| CN210428114U (en) | Multi-system time source redundant timing equipment | |
| JP3796380B2 (en) | Time correction information output device and automatic time correction clock | |
| JPH11154920A (en) | Clock synchronizing method for synchronizing-type base station control system and its synchronizing device | |
| CN113960918B (en) | Single-line time service and time keeping method based on global satellite navigation system GNSS | |
| US20080165627A1 (en) | Time Adjustment Device, Timepiece with a Time Adjustment Device, and Time Adjustment Method | |
| US6298014B1 (en) | Time information management system | |
| JP2008170228A (en) | Time correction apparatus, timer device equipped with the same, and time correction method | |
| CN102944992B (en) | Real-time clock timing device and method thereof in online monitoring of high-voltage line arrester | |
| CN209949115U (en) | Multi-clock source integrated network time system card | |
| US7782716B2 (en) | Time adjustment device, timepiece with a time adjustment device, and time adjustment method | |
| CN201540463U (en) | Big dipper-1 passive positioning time service terminal | |
| JPH10191473A (en) | Monitor control system | |
| JP2009085604A (en) | Time correction apparatus, time measuring instrument with same, and time correction method | |
| CN102955425B (en) | Satellite timing method with highly reliable fixed point position |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181225 |
|
| RJ01 | Rejection of invention patent application after publication |