CN106656451A - Time-keeping and timing precision test device, time-keeping precision test method and timing precision test method based on satellite timing system - Google Patents
Time-keeping and timing precision test device, time-keeping precision test method and timing precision test method based on satellite timing system Download PDFInfo
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- CN106656451A CN106656451A CN201611250240.2A CN201611250240A CN106656451A CN 106656451 A CN106656451 A CN 106656451A CN 201611250240 A CN201611250240 A CN 201611250240A CN 106656451 A CN106656451 A CN 106656451A
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- time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/06—Decoding time data; Circuits therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the field of a photoelectric test and relates to a time-keeping and timing precision test device, time-keeping precision test method and timing precision test method based on the satellite timing system. The device comprises a receiving antenna, a satellite signal receiver, an interface unit, a B code demodulation unit, a master control unit, a sequential machine and delay PLL unit, a computer and a temperature compensation crystal oscillator. The time-keeping precision and timing precision are calculated in a mode of recording arrival time of a to-be-tested signal, and the time-keeping and timing precision test device, the time-keeping precision test method and the timing precision test method based on the GPS/Beidou system are simple in test process and easy in engineering realization.
Description
Technical field
The invention belongs to photoelectricity test field, is related to a kind of based on the punctual of satellite navigation system, time service precision test dress
Put and method.
Background technology
Time synchronized is exactly by the clock alignment of different places, using one of them time as the standard time, by another
Clock is adjusted to the standard time, so as to reach clock synchronization.With the development of science and technology, high-precision time synchronized extensively should
For industry-by-industry.At present satellite time service system mainly has four kinds, is the GPS system in the U.S., the dipper system of China, Russia respectively
The GLONASS systems of Ross and the Galileo system in Europe.Domestic in China, the use of GPS system and dipper system is more wide
It is general.
According to the composition of clock sync signal, there are two kinds of different synchronization realizing methods, a kind of is serial/parallel synchronization side
Formula, a kind of is impulsive synchronization mode.
The serial/parallel method of synchronization generally uses IRIG-B codes, and (B timing codes can be divided into exchange AC by its characteristics of signals
Code and direct current DC codes), the when frame rate of B timing codes is 1 frame/s；The information that can transmit 100 (includes：Year, the moon, day, when, point,
Second).Various kinds of equipment is per second to receive serial/parallel temporal information, realizes clock synchronization according to this data flow.Clock synchronization information number
According to the whole second information for containing date Hour Minute Second etc. and being accurate to the second.Which is relatively easy, but its maximum shortcoming is string
There is certain time delay in the data that row/parallel interface is obtained in transmitting procedure, clock synchronization accuracy is relatively low, such as further need to carry
High clock synchronization accuracy, need to be with reference to other modes.
Impulsive synchronization mode, receives the signal from satellite at every fixed time, produces a pulse signal, receives dress
Put and processed using corresponding hardware and software according to this pulse, local clock is adjusted, so as to reach user clock
It is synchronous, in ideal conditions, the reception of the time interval such as the cycle of pulse, frequency interval are.Impulsive synchronization mode is relative
Other modes are simple, easy-to-use.The signal is usually the time pulse of whole second, and the clock for carrying out equipment as clock clearing standard is same
Step.
In time synchronized, topmost index is synchronization accuracy, punctual precision.The index is B time code interface terminals
Leading indicator.According to B time code interface terminal general specifications (GJB2991A-2008), synchronization accuracy, punctual precision measurement all
Need equipment under test with outputting standard pulse per second (PPS), and an IV type B code interface termination when testing, can be needed.Deposit in actual test
In problems with：
Popularity rate is relatively low in actual use for (1) IV type B code interface termination, and test condition is difficult to meet；
(2) for the equipment exported without standard pulse per second (PPS), without effective measurement means；
(3) method of testing can only be measured to the equipment for having impulsive synchronization output, and cannot be to serial/parallel synchronization
Tested.
The content of the invention
In order to solve technical problem present in background technology, the present invention provides a kind of keeping based on satellite time service system
When, time service precision test device and method.
The present invention technical solution be：A kind of punctual, time service precision test device based on satellite time service system, its
It is characterized in that：Including reception antenna, satellite signal receiver, interface unit, B code demodulating units, main control unit, sequential
Machine and time delay PLL unit, computer and temperature-compensating crystal oscillator；
The input of the satellite signal receiver is connected with reception antenna, and the outfan of satellite signal receiver is by connecing
Mouth unit is connected with B code demodulating units, main control unit and computer respectively；
The B codes demodulating unit is connected with main control unit by interface unit；
The main control unit is connected with equipment under test and computer respectively by interface unit；
The main control unit passes through interface unit and equipment under test phase after connection sequential machine and time delay PLL unit again
Even；
The temperature-compensating crystal oscillator is connected with main control unit；
1PPS standard second signal output interfaces, B timing codes output interface and test interface are provided with the interface unit.
Preferably, the PPS pulse per second (PPS)s precision of above-mentioned satellite signal receiver is higher than 10ns, pulse width is 100 ± 10ms,
Satellite locking time is less than 1 minute.
Preferably, above-mentioned interface unit has RS422 input/output interfaces, RS232 input/output interfaces, LVDS inputs defeated
Outgoing interface and SMA input/output interfaces；The time delay of the SMA input/output interfaces is less than 5ns.
Preferably, the operating frequency of said temperature compensation crystal oscillator is higher than 10MHz, frequency temperature degree of stability is ± 5ppm, always
Rate is ± 5ppm/.
Preferably, above-mentioned satellite signal receiver, interface unit, B code demodulating units, main control unit, sequential machine and prolonging
When PLL unit and temperature-compensating crystal oscillator be packaged in inside electric cabinet.
The present invention also provides a kind of time service precision method of testing based on satellite time service system, and which is characterized in that：Bag
Include following steps：
1) the 1PPS standard seconds signal output interface of interface unit is connected with the pulse per second (PPS) interface of equipment under test；By interface
The B timing codes output interface of unit is connected with the B timing code interfaces of equipment under test；By the measured signal output interface of equipment under test
It is connected with the test interface of interface unit；
2) reception antenna sends the satellite-signal for receiving to satellite signal receiver, and satellite signal receiver locking is more
Satellite simultaneously receives the B time code signals and 1PPS pps pulse per second signals of satellite transmission；
3) satellite locking signal is sent to computer by satellite signal receiver by interface unit, and computer judges locking
Number of satellite whether be more than or equal to 4；If so, then execution step is 4)；If it is not, then adjusting the position of reception antenna and returning
Return step 2)；
4) satellite locking signal and the 1PPS pps pulse per second signals for receiving are sent out by satellite signal receiver by interface unit
Main control unit is delivered to, the B time code signals for receiving are sent single to the demodulation of B codes by interface unit by satellite signal receiver
Unit；
5) the B time code signals through error code correction or phase adaptation are sent out by B codes demodulating unit by interface unit
Main control unit is delivered to, and is updated once every second data；
Main control unit exports the B time code signals for receiving to sequential machine and time delay PLL unit, in sequential machine and prolongs
When PLL unit in complete shaping, precise alignment and the time delay output control logic of alternating current-direct current B timing codes, then by interface list
The B timing code output interfaces of unit are exported to equipment under test；
The 1PPS pps pulse per second signals for receiving are exported to equipment under test by main control unit by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, and frequency dividing is carried out to clock signal as counting
Device, after frequency dividing, frequency is not less than 100MHz；The microsecond value at the moment is calculated by count value, resolution is not less than 0.1ms；Count
Value is per second to be zeroed out by 1PPS pps pulse per second signals；
6) equipment under test carries out time synchronized after receiving B time code signals and 1PPS pps pulse per second signals, after synchronously completing
Measured signal is sent to main control unit by the test interface of interface unit；
7) main control unit records the due in of measured signal, and the B timing codes for reading measured signal obtain the moment
My god, when, minute, second information, the counting for reading enumerator is worth to the microsecond information at the moment；Main control unit is by the moment for obtaining
Information is sent to computer by interface unit；
8) computer is tested to the time service precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of the time information that computer reads, when, minute, second value and quilt
Measurement equipment is consistent, and the microsecond value of the time information that computer reads is the time service precision of equipment under test；
If measured signal be non-1PPS pps pulse per second signals, computer read time information day, when, minute, second value with
Equipment under test is consistent, and the microsecond value of the time information that computer reads is quilt with the absolute value of the difference of the microsecond value of measured signal
The time service precision of measurement equipment.
Preferably, above-mentioned time service precision is three later maximums of retest.
The present invention also provides a kind of punctual method for testing precision based on satellite time service system, and which is characterized in that：Bag
Include following steps：
1) the 1PPS standard seconds signal output interface of interface unit is connected with the pulse per second (PPS) interface of equipment under test；By interface
The B timing codes output interface of unit is connected with the B timing code interfaces of equipment under test；
2) reception antenna sends the satellite-signal for receiving to satellite signal receiver, and satellite signal receiver locking is more
Satellite simultaneously receives the B time code signals and 1PPS pps pulse per second signals of satellite transmission；
3) satellite locking signal is sent to computer by satellite signal receiver by interface unit, and computer judges locking
Number of satellite whether be more than or equal to 4；If so, then execution step is 4)；If it is not, then adjusting the position of reception antenna and returning
Return step 2)；
4) satellite locking signal and the 1PPS pps pulse per second signals for receiving are sent out by satellite signal receiver by interface unit
Main control unit is delivered to, the B time code signals for receiving are sent single to the demodulation of B codes by interface unit by satellite signal receiver
Unit；
5) the B time code signals through error code correction or phase adaptation are sent out by B codes demodulating unit by interface unit
Main control unit is delivered to, and is updated once every second data；
Main control unit exports the B time code signals for receiving to sequential machine and time delay PLL unit, in sequential machine and prolongs
When PLL unit in complete shaping, precise alignment and the time delay output control logic of alternating current-direct current B timing codes, then by interface list
The B timing code output interfaces of unit are exported to equipment under test；
The 1PPS pps pulse per second signals for receiving are exported to equipment under test by main control unit by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, and frequency dividing is carried out to clock signal as counting
Device, after frequency dividing, frequency is not less than 100MHz；The microsecond value at the moment is calculated by count value, resolution is not less than 0.1ms；Count
Value is per second to be zeroed out by 1PPS pps pulse per second signals；
6) equipment under test carries out time synchronized after receiving B time code signals and 1PPS pps pulse per second signals, after synchronously completing
Disconnect the connection of equipment under test and interface unit；
After the equipment under test independent operating stipulated time, then by the measured signal output interface of equipment under test and interface unit
Test interface is connected；Equipment under test sends measured signal to main control unit；
7) main control unit records the due in of measured signal, and the B timing codes for reading measured signal obtain the moment
My god, when, minute, second information, the counting for reading enumerator is worth to the microsecond information at the moment；Main control unit is by the moment for obtaining
Information is sent to computer by interface unit；
8) computer is tested to the punctual precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of the time information that computer reads, when, minute, second value and quilt
Measurement equipment is consistent, and the microsecond value of the time information that computer reads is the punctual precision of equipment under test；
If measured signal be non-1PPS pps pulse per second signals, computer read time information day, when, minute, second value with
Equipment under test is consistent, and the microsecond value of the time information that computer reads is quilt with the absolute value of the difference of the microsecond value of measured signal
The punctual precision of measurement equipment.
Preferably, above-mentioned punctual precision is three later maximums of retest.
The beneficial effects of the present invention is：
(1) present invention carries out calculating punctual, time service precision using the mode of record measured signal due in.There is provided one
Kind of test process is simple, it is easy to Project Realization based on the punctual of GPS/ dipper systems, time service precision test system and method.
(2) other auxiliary equipments are not needed when the present invention measures punctual, time service precision, test process is simplified.
(3) present invention using system itself generation 1PPS standard pulse per second (PPS)s, B time code signals equipment under test is carried out when
Between it is synchronous.The test error brought using different 1PPS standards pulse per second (PPS)s, B time code signals is avoided effectively.
(4) interface unit of the present invention has RS422 input interfaces, RS232 input interfaces, LVDS input interfaces.Can be with complete
Into the collecting work of various measured signals.The present invention can send 2Vp-p～8Vp-pB (AC) timing codes and RS422, RS232
B (DC) time code signals improve the versatility of test equipment to equipment under test.
(5) present invention uses high precision temperature compensation crystal oscillator accurate as frequency.The crystal oscillator is stable with higher frequency temperature
Degree：± 5ppm, reduces impact of the ambient temperature to testing；The crystal oscillator has relatively low ageing rate：± 5ppm/, improves
The stability and measuring accuracy of test equipment.
(6) present invention is using high accuracy sequential machine and time delay PLL carries out precise alignment to B timing codes and delays time to control is defeated
Go out, improve measuring accuracy.
(7) present invention realizes punctual, time service precision using computer controls and data acquisition technology and tests automatically, saves
Labour force and cost.
Description of the drawings
Fig. 1 is the present invention based on the punctual of satellite time service system, the system schematic of time service precision test device.
Specific embodiment
Referring to Fig. 1, the present invention provides a kind of based on the punctual of satellite time service system, time service precision test device, and which is preferable
The system of embodiment is constituted
Machine), interface unit, B code demodulating units, high precision temperature compensation crystal oscillator, main control unit, high accuracy sequential machine and time delay PLL
And computer.
Reception antenna is connected with GPS/ Beidou receiver antenna ends.Interface unit respectively with GPS/ Beidou receivers, B code solutions
Unit, main control unit, computer is adjusted to be connected.Main control unit respectively with interface unit, high precision temperature compensation crystal oscillator, high-precision
Degree sequential machine and time delay PLL are connected.
The precision of the PPS pulse per second (PPS)s of GPS/ Beidou receivers is better than 10ns, positive pulse, pulse width 100ms ± 10ms.
GPS capture times are less than 1 minute.
Interface unit has RS422 input/output interfaces, RS232 input/output interfaces, LVDS input/output interfaces, SMA
Input/output interface.The time delay of wherein 2 road SMA output interfaces is respectively less than 5ns.Can receive and send 2Vp-p～8Vp-pB
(AC) B (DC) time code signal of timing code and RS422.
B code demodulating units have B timing code error code correction functions and B (AC) code phase adaptation function.With at least 30
Parallel-by-bit code time code output function (wherein 7, point of second 7, when 6, day 10), high level effectively, Transistor-Transistor Logic level.
High precision temperature compensation crystal oscillator operating frequency is higher than 10MHz；With higher frequency temperature degree of stability：±5ppm；
Relatively low ageing rate：± 5ppm/.
GPS/ Beidou receivers, interface unit, B code demodulating units, high precision temperature compensation crystal oscillator, main control unit, height
Precision sequential machine and time delay PLL are packaged in inside electric cabinet.
The operation principle based on the punctual of satellite time service system, time service precision test device that the present invention is provided is as follows：
Reception antenna receives GPS/ Big Dipper signals, sends to GPS/ Beidou receivers.GPS/ Beidou receivers lock 4
GPS/ big-dipper satellites above.Receive B time code signals and 1PPS pps pulse per second signals that satellite sends.Sent by interface unit
B time code signals send 1PPS pps pulse per second signals, machine satellite locking signal to main control unit to B code demodulating units.Send lock
Signal is determined to computer.
After main control unit receives satellite locking signal, B codes demodulating unit is received through error code correction (DC codes) or phase
The B time code datas of position adaptive (AC codes), are updated once every second data.The output of B time code signals to high accuracy sequential machine and
Time delay PLL unit, completes shaping, precise alignment and the time delay output control logic of alternating current-direct current B timing codes in unit, then defeated
Go out to be worth interface unit.After main control unit receives 1PPS pulse per second (PPS)s, timing signal forwarding is directly carried out, as standard 1PPS second arteries and veins
Punching.
Main control unit receives the clock signal of high precision temperature compensation crystal oscillator output, carries out frequency dividing conduct to clock signal
Counting clock, after frequency dividing, frequency is not less than 100MHz；The microsecond value at the moment is calculated by count value, resolution is not less than
0.1us.Count value is per second to be zeroed out by standard 1PPS pps pulse per second signal.
Main control unit sends standard 1PPS pps pulse per second signal and B time code signal to equipment under test by interface unit,
For time synchronized.Main control unit receives the measured signal that equipment under test sends.Record measured signal reach when (rising edge or
Trailing edge) moment：Read B timing codes and counter, obtain the moment day, when, minute, second, microsecond information.Should
As a result sent to computer by interface unit.
The present invention provide based on the punctual of satellite time service system, time service precision test device specific workflow such as
Under：
1) system 1PPS standard second signal output interface is connected with equipment under test pulse per second (PPS) interface；System B timing code is defeated
Outgoing interface is connected with equipment under test B timing code interfaces；By the characteristic signal output interface of equipment under test and the test interface of system
It is connected；
2) reception antenna is placed in into outdoor ward, connection reception antenna is to GPS/ Beidou receivers.Opening equipment electricity
Source；
3) wait one minute, check whether computer receives locking information.Enter if locking 4 and more than four satellites
Row next step.Reception antenna position is adjusted if locking satellite is less than 4 or locking failure, repeat step is 2)；
4) equipment under test reception system sends 1PPS standards pps pulse per second signal and B time code signals；Wait equipment under test
Carry out time synchronized；After synchronously completing, output characteristic signal is to system；
5) system recording feature signal reach (rising edge is effective or trailing edge the is effective) moment (include day, when, it is minute, second, micro-
Second information)；And by the information output to computer.
6) following four situation is divided into according to test request and test condition：
A) test time service precision and output signal is 1PPS pps pulse per second signals：Check computer testing result, wherein day,
When, minute, second value should it is consistent with equipment under test (if inconsistent serial ports/parallel port time service error be more than or equal to 1s, be generally viewed as not conforming to
Lattice), microsecond value had both been time service precision；Retest more than 3 times, takes maximum for test result；
B) test time service precision and output signal is non-1PPS pps pulse per second signals：Check computer testing result, wherein day,
When, minute, second value should it is consistent with equipment under test (if inconsistent serial ports/parallel port time service error be more than or equal to 1s, be generally viewed as not conforming to
Lattice), the microsecond value of equipment under test record had both been time service precision with the absolute value of the difference of system microsecond value；Retest more than 3 times,
Maximum is taken for test result；
C) test punctual precision and output signal is 1PPS pps pulse per second signals：Synchronously complete later, be devices under disconnecting
1PPS standards pps pulse per second signal and B time code signals.After the equipment under test independent operating stipulated time (for example：30 minutes or 24 little
When) start test, check computer testing result, wherein day, when, minute, second value consistent with equipment under test (should go here and there if inconsistent
Mouth/parallel port time keeping error be more than or equal to 1s, be generally viewed as unqualified), microsecond value both keep time precision；Retest more than 3 times, takes
Maximum is test result；
D) test punctual precision and output signal is non-1PPS pps pulse per second signals：Synchronously complete later, be devices under breaking
Open 1PPS standards pps pulse per second signal and B time code signals.After the equipment under test independent operating stipulated time (for example：30 minutes or 24
Hour) start test, check computer testing result, wherein day, when, minute, second value should be consistent with equipment under test record value (if not
Consistent then serial ports/parallel port time service error is more than or equal to 1s, is generally viewed as unqualified), the microsecond value and system of equipment under test record
The absolute value of the difference of microsecond value had been both punctual precision；Retest more than 3 times, takes maximum for test result.
Claims (9)
1. a kind of based on the punctual of satellite time service system, time service precision test device, it is characterised in that：Including reception antenna, defend
Star signal receiver, interface unit, B code demodulating units, main control unit, sequential machine and time delay PLL unit, computer and temperature
Compensation crystal oscillator；
The input of the satellite signal receiver is connected with reception antenna, and the outfan of satellite signal receiver passes through interface list
Unit is connected with B code demodulating units, main control unit and computer respectively；
The B codes demodulating unit is connected with main control unit by interface unit；
The main control unit is connected with equipment under test and computer respectively by interface unit；
The main control unit is connected with equipment under test by interface unit after connection sequential machine and time delay PLL unit again；
The temperature-compensating crystal oscillator is connected with main control unit；
1PPS standard second signal output interfaces, B timing codes output interface and test interface are provided with the interface unit.
2. according to claim 1 based on the punctual of satellite time service system, time service precision test device, it is characterised in that：
The PPS pulse per second (PPS)s precision of the satellite signal receiver is higher than 10ns, and pulse width is 100 ± 10ms, and satellite locking time is little
In 1 minute.
3. according to claim 1 based on the punctual of satellite time service system, time service precision test device, it is characterised in that：
The interface unit has RS422 input/output interfaces, RS232 input/output interfaces, LVDS input/output interfaces and SMA input
Output interface；The time delay of the SMA input/output interfaces is less than 5ns.
4. according to claim 1 based on the punctual of satellite time service system, time service precision test device, it is characterised in that：
The operating frequency of the temperature-compensating crystal oscillator is higher than 10MHz, and frequency temperature degree of stability is ± 5ppm, and ageing rate is ± 5ppm/.
5. according to claim 1 based on the punctual of satellite time service system, time service precision test device, it is characterised in that：
The satellite signal receiver, interface unit, B code demodulating units, main control unit, sequential machine and time delay PLL unit and temperature
Compensation crystal oscillator is packaged in inside electric cabinet.
6. a kind of time service precision method of testing based on satellite time service system, it is characterised in that：Comprise the following steps：
1) the 1PPS standard seconds signal output interface of interface unit is connected with the pulse per second (PPS) interface of equipment under test；By interface unit
B timing codes output interface be connected with the B timing code interfaces of equipment under test；By the measured signal output interface of equipment under test with connect
The test interface of mouth unit is connected；
2) reception antenna sends the satellite-signal for receiving to satellite signal receiver, and satellite signal receiver locks many and defends
Star simultaneously receives B time code signals and the 1PPS pps pulse per second signals that satellite sends；
3) satellite locking signal is sent to computer by satellite signal receiver by interface unit, and computer judges defending for locking
Whether star number amount is more than or equal to 4；If so, then execution step is 4)；If it is not, then adjusting the position of reception antenna and returning step
It is rapid 2)；
4) satellite signal receiver by satellite locking signal and the 1PPS pps pulse per second signals that receive by interface unit send to
The B time code signals for receiving are sent to B code demodulating units by main control unit, satellite signal receiver by interface unit；
5) B codes demodulating unit by the B time code signals through error code correction or phase adaptation by interface unit send to
Main control unit, and it is updated once every second data；
Main control unit exports the B time code signals for receiving to sequential machine and time delay PLL unit, in sequential machine and time delay
Shaping, precise alignment and the time delay output control logic of alternating current-direct current B timing codes are completed in PLL unit, then by interface unit
B timing code output interfaces export to equipment under test；
The 1PPS pps pulse per second signals for receiving are exported to equipment under test by main control unit by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, clock signal is divided as enumerator, point
After frequency, frequency is not less than 100MHz；The microsecond value at the moment is calculated by count value, resolution is not less than 0.1 μ s；Count value is every
Second is zeroed out by 1PPS pps pulse per second signals；
6) equipment under test carries out time synchronized after receiving B time code signals and 1PPS pps pulse per second signals, will treat after synchronously completing
Survey signal to send to main control unit by the test interface of interface unit；
7) main control unit record measured signal due in, read measured signal B timing codes obtain the moment day,
When, minute, second information, the counting for reading enumerator is worth to the microsecond information at the moment；The moment for obtaining is believed by main control unit
Breath is sent to computer by interface unit；
8) computer is tested to the time service precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of the time information that computer reads, when, minute, second value set with tested
Standby consistent, the microsecond value of the time information that computer reads is the time service precision of equipment under test；
If measured signal be non-1PPS pps pulse per second signals, computer read time information day, when, minute, second value with it is tested
Equipment is consistent, and microsecond value and the absolute value of the difference of the microsecond value of measured signal of the time information that computer reads are tested setting
Standby time service precision.
7. the time service precision method of testing based on satellite time service system according to claim 6, it is characterised in that：It is described to award
Shi Jingdu is three later maximums of retest.
8. a kind of punctual method for testing precision based on satellite time service system, it is characterised in that：Comprise the following steps：
1) the 1PPS standard seconds signal output interface of interface unit is connected with the pulse per second (PPS) interface of equipment under test；By interface unit
B timing codes output interface be connected with the B timing code interfaces of equipment under test；
2) reception antenna sends the satellite-signal for receiving to satellite signal receiver, and satellite signal receiver locks many and defends
Star simultaneously receives B time code signals and the 1PPS pps pulse per second signals that satellite sends；
3) satellite locking signal is sent to computer by satellite signal receiver by interface unit, and computer judges defending for locking
Whether star number amount is more than or equal to 4；If so, then execution step is 4)；If it is not, then adjusting the position of reception antenna and returning step
It is rapid 2)；
4) satellite signal receiver by satellite locking signal and the 1PPS pps pulse per second signals that receive by interface unit send to
The B time code signals for receiving are sent to B code demodulating units by main control unit, satellite signal receiver by interface unit；
5) B codes demodulating unit by the B time code signals through error code correction or phase adaptation by interface unit send to
Main control unit, and it is updated once every second data；
Main control unit exports the B time code signals for receiving to sequential machine and time delay PLL unit, in sequential machine and time delay
Shaping, precise alignment and the time delay output control logic of alternating current-direct current B timing codes are completed in PLL unit, then by interface unit
B timing code output interfaces export to equipment under test；
The 1PPS pps pulse per second signals for receiving are exported to equipment under test by main control unit by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, clock signal is divided as enumerator, point
After frequency, frequency is not less than 100MHz；The microsecond value at the moment is calculated by count value, resolution is not less than 0.1ms；Count value is every
Second is zeroed out by 1PPS pps pulse per second signals；
6) equipment under test carries out time synchronized after receiving B time code signals and 1PPS pps pulse per second signals, disconnects after synchronously completing
The connection of equipment under test and interface unit；
After the equipment under test independent operating stipulated time, then by the test of the measured signal output interface of equipment under test and interface unit
Interface is connected；Equipment under test sends measured signal to main control unit；
7) main control unit record measured signal due in, read measured signal B timing codes obtain the moment day,
When, minute, second information, the counting for reading enumerator is worth to the microsecond information at the moment；The moment for obtaining is believed by main control unit
Breath is sent to computer by interface unit；
8) computer is tested to the punctual precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of the time information that computer reads, when, minute, second value set with tested
Standby consistent, the microsecond value of the time information that computer reads is the punctual precision of equipment under test；
If measured signal be non-1PPS pps pulse per second signals, computer read time information day, when, minute, second value with it is tested
Equipment is consistent, and microsecond value and the absolute value of the difference of the microsecond value of measured signal of the time information that computer reads are tested setting
Standby punctual precision.
9. the punctual method for testing precision based on satellite time service system according to claim 8, it is characterised in that：It is described to keep
Shi Jingdu is three later maximums of retest.
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| CN113391544A (en) * | 2021-05-11 | 2021-09-14 | 国网浙江省电力有限公司湖州供电公司 | Time synchronization system calibration device and method based on Beidou GPS |
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