CN206364812U - A kind of punctual, time service precision test device based on satellite time service system - Google Patents
A kind of punctual, time service precision test device based on satellite time service system Download PDFInfo
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- CN206364812U CN206364812U CN201621469772.0U CN201621469772U CN206364812U CN 206364812 U CN206364812 U CN 206364812U CN 201621469772 U CN201621469772 U CN 201621469772U CN 206364812 U CN206364812 U CN 206364812U
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Abstract
The utility model belongs to photoelectricity test field, it is related to a kind of punctual, time service precision test device based on satellite navigation system, the device includes reception antenna, satellite signal receiver, interface unit, B codes demodulating unit, main control unit, sequential machine and delay PLL unit, computer and temperature-compensating crystal oscillator.The utility model carries out calculating punctual, time service precision using the mode for recording measured signal due in, is that a kind of test process is simple, it is easy to punctual, the time service precision test system based on GPS/ dipper systems of Project Realization.
Description
Technical field
The utility model belongs to photoelectricity test field, is related to a kind of punctual, time service precision based on satellite navigation system and surveys
Trial assembly is put.
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 that clock is synchronous.With the development of science and technology, high-precision time synchronized extensively should
For industry-by-industry.Current satellite time service system mainly has four kinds, is the gps system, the dipper system of China, Russia in the U.S. 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, one kind is serial/parallel synchronization side
Formula, one kind is impulsive synchronization mode.
Typically using IRIG-B codes, (B timing codes can be divided into exchange AC to the serial/parallel method of synchronization by its characteristics of signals
Code and direct current DC codes), the when frame rate of B timing codes is 1 frame/s；Can transmit 100 information (including：Year, the moon, day, when, point,
Second).Various kinds of equipment is per second to receive serial/parallel temporal information, realizes that clock is synchronous 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, clock synchronization accuracy is relatively low, such as need to further carry in transmitting procedure
High clock synchronization accuracy, need to combine other modes.
Impulsive synchronization mode, receives the signal from satellite at every fixed time, produces a pulse signal, receives dress
Put and handled according to this pulse using corresponding hardware and software, local clock is adjusted, so as to reach user clock
It is synchronous, in ideal conditions, the reception for the time spacing 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 resetting standard progress equipment as clock is same
Step.
Topmost index is synchronization accuracy, punctual precision in time synchronized.This index is B time code interface terminals
Leading indicator.According to B time code interface terminals general specification (GJB2991A-2008), synchronization accuracy, punctual precision measurement all
Equipment under test is needed to need an IV type B codes interface termination with outputting standard pulse per second (PPS), and when testing.Deposited in actual test
In problems with：
Popularity rate is relatively low in actual use for (1) IV type B codes interface termination, and test condition is difficult to meet；
(2) equipment for being 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 to export, and can not be synchronous to serial/parallel
Tested.
Utility model content
In order to solve technical problem present in background technology, the utility model provides a kind of based on satellite time service system
Punctual, time service precision test device.
Technical solution of the present utility model is：A kind of punctual, time service precision test dress based on satellite time service system
Put, it is characterized in that：Including reception antenna, satellite signal receiver, interface unit, B codes demodulating unit, main control list
Member, sequential machine and delay PLL unit, computer and temperature-compensating crystal oscillator；
The input of the satellite signal receiver is connected with reception antenna, and the output end of satellite signal receiver is by connecing
Mouth unit is connected with B codes demodulating unit, main control unit and computer respectively；
The B codes demodulating unit is connected by interface unit with main control 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 again after connection sequential machine and delay PLL unit
Even；
The temperature-compensating crystal oscillator is connected with main control unit；
1PPS standard seconds signal output interface, 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 delay of the SMA input/output interfaces is less than 5ns.
Preferably, the working frequency of said temperature compensation crystal oscillator is higher than 10MHz, frequency temperature stability is ± 5ppm, always
Rate is ± 5ppm/.
Preferably, above-mentioned satellite signal receiver, interface unit, B codes demodulating unit, main control unit, sequential machine and prolonging
When PLL unit and temperature-compensating crystal oscillator be packaged in inside electric cabinet.
The utility model also provides a kind of time service precision method of testing based on satellite time service system, and its special character exists
In：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
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 received to satellite signal receiver, and satellite signal receiver locking is more
Satellite and the B time code signals and 1PPS pps pulse per second signals for receiving satellite transmission；
3) satellite signal receiver sends satellite locking signal to computer by interface unit, and computer judges locking
Number of satellite whether be more than or equal to 4；If so, then performing step 4)；If it is not, then adjusting the position of reception antenna and returning
Return step 2)；
4) satellite signal receiver sends out satellite locking signal and the 1PPS pps pulse per second signals received by interface unit
Main control unit is delivered to, the B time code signals received are sent to B codes and demodulate list by satellite signal receiver by interface unit
Member；
5) B codes demodulating unit sends out the B time code signals by error code correction or phase adaptation 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 received to sequential machine and delay PLL unit, in sequential machine and prolongs
When PLL unit in complete the shapings of alternating current-direct current B timing codes, precise alignment and delay output control logic, then pass through interface list
The B timing code output interfaces of member are exported to equipment under test；
Main control unit exports the 1PPS pps pulse per second signals received to equipment under test by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, and clock signal progress frequency dividing is used as and counted
Frequency is not less than 100MHz after device, frequency dividing；The microsecond value at the moment is calculated by count value, resolution ratio 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 counter is worth to the microsecond information at the moment；At the time of main control unit will be obtained
Information is sent to computer by interface unit；
8) computer is tested the time service precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of information at the time of computer is read, when, minute, second value and quilt
Measurement equipment is consistent, and the microsecond value of information is the time service precision of equipment under test at the time of computer is read；
If measured signal be non-1PPS pps pulse per second signals, computer read at the time of information day, when, minute, second value with
Equipment under test is consistent, and the absolute value of the difference of the microsecond value of information and the microsecond value of measured signal is quilt at the time of computer is read
The time service precision of measurement equipment.
Preferably, above-mentioned time service precision is three later maximums of retest.
The utility model also provides a kind of punctual method for testing precision based on satellite time service system, and its special character exists
In：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
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 received to satellite signal receiver, and satellite signal receiver locking is more
Satellite and the B time code signals and 1PPS pps pulse per second signals for receiving satellite transmission；
3) satellite signal receiver sends satellite locking signal to computer by interface unit, and computer judges locking
Number of satellite whether be more than or equal to 4；If so, then performing step 4)；If it is not, then adjusting the position of reception antenna and returning
Return step 2)；
4) satellite signal receiver sends out satellite locking signal and the 1PPS pps pulse per second signals received by interface unit
Main control unit is delivered to, the B time code signals received are sent to B codes and demodulate list by satellite signal receiver by interface unit
Member；
5) B codes demodulating unit sends out the B time code signals by error code correction or phase adaptation 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 received to sequential machine and delay PLL unit, in sequential machine and prolongs
When PLL unit in complete the shapings of alternating current-direct current B timing codes, precise alignment and delay output control logic, then pass through interface list
The B timing code output interfaces of member are exported to equipment under test；
Main control unit exports the 1PPS pps pulse per second signals received to equipment under test by interface unit；
Main control unit receives the clock signal of temperature-compensating crystal oscillator output, and clock signal progress frequency dividing is used as and counted
Frequency is not less than 100MHz after device, frequency dividing；The microsecond value at the moment is calculated by count value, resolution ratio 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 counter is worth to the microsecond information at the moment；At the time of main control unit will be obtained
Information is sent to computer by interface unit；
8) computer is tested the punctual precision of equipment under test：
If measured signal is 1PPS pps pulse per second signals, the day of information at the time of computer is read, when, minute, second value and quilt
Measurement equipment is consistent, and the microsecond value of information is the punctual precision of equipment under test at the time of computer is read；
If measured signal be non-1PPS pps pulse per second signals, computer read at the time of information day, when, minute, second value with
Equipment under test is consistent, and the absolute value of the difference of the microsecond value of information and the microsecond value of measured signal is quilt at the time of computer is read
The punctual precision of measurement equipment.
Preferably, above-mentioned punctual precision is three later maximums of retest.
The beneficial effects of the utility model are：
(1) the utility model carries out calculating punctual, time service precision using the mode for recording measured signal due in.There is provided
A kind of test process is simple, it is easy to punctual, the time service precision test system based on GPS/ dipper systems of Project Realization and side
Method.
(2) the utility model measurement is punctual, time service precision when do not need other auxiliary equipments, simplify test process.
(3) the utility model is produced using system itself 1PPS standards pulse per second (PPS), B time code signals enter to equipment under test
Row time synchronized.Effectively avoid the test error brought using different 1PPS standards pulse per second (PPS)s, B time code signals.
(4) the utility model interface unit has RS422 input interfaces, RS232 input interfaces, LVDS input interfaces.Can
To complete the collecting work of a variety of measured signals.The utility model 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) the utility model uses high precision temperature compensation crystal oscillator accurate as frequency.The crystal oscillator has higher frequency temperature
Stability：± 5ppm, reduces influence of the environment temperature to test；The crystal oscillator has relatively low ageing rate：± 5ppm/, is carried
The stability and measuring accuracy of high test equipment.
(6) the utility model carries out precise alignment and delays time to control using high-precision sequential machine and delay PLL to B timing codes
Output, improves measuring accuracy.
(7) the utility model makes to computerized control and data acquisition technology realizes punctual, time service precision and tested automatically,
Save labour and cost.
Brief description of the drawings
Fig. 1 is the punctual, system schematic of time service precision test device of the utility model based on satellite time service system.
Embodiment
Referring to Fig. 1, the utility model provides a kind of punctual, time service precision test device based on satellite time service system, its
The system of preferred embodiment is constituted mainly (to be connect including reception antenna, satellite signal receiver in the present embodiment from the GPS/ Big Dippeves
Receipts machine), interface unit, B codes demodulating unit, high precision temperature compensation crystal oscillator, main control unit, high-precision sequential machine and delay
PLL and computer.
Reception antenna is connected with GPS/ Beidou receiver antenna ends.Interface unit is solved with GPS/ Beidou receivers, B codes respectively
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
Spend sequential machine and delay PLL is 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 delay of wherein 2 road SMA output interfaces is respectively less than 5ns.It can receive and send 2Vp-p~8Vp-pB
(AC) timing code and RS422 B (DC) time code signal.
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 is effective, Transistor-Transistor Logic level.
High precision temperature compensation crystal oscillator operating frequency is higher than 10MHz；With higher frequency temperature stability：±5ppm；
Relatively low ageing rate：± 5ppm/.
GPS/ Beidou receivers, interface unit, B codes demodulating unit, high precision temperature compensation crystal oscillator, main control unit, height
Precision sequential machine and delay PLL are packaged in inside electric cabinet.
Punctual, time service precision test device the operation principle based on satellite time service system that the utility model is provided is such as
Under：
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 is sent.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.
Main control unit is received after satellite locking signal, is received B codes demodulating unit and is passed through error code correction (DC codes) or phase
The B time code datas of position adaptive (AC codes), are updated once every second data.B time code signals be output to high-precision sequential machine and
Be delayed PLL unit, and shaping, precise alignment and the delay output control logic of alternating current-direct current B timing codes are completed in unit, then defeated
Go out to be worth interface unit.Main control unit is received after 1PPS pulse per second (PPS)s, is directly carried out timing signal forwarding, is used as 1PPS seconds arteries and veins of standard
Punching.
Main control unit receives the clock signal of high precision temperature compensation crystal oscillator output, and frequency dividing conduct is carried out to clock signal
Frequency is not less than 100MHz after counting clock, frequency dividing；The microsecond value at the moment is calculated by count value, resolution ratio is not less than
0.1us.Count value is per second to be zeroed out by standard 1PPS pps pulse per second signals.
Main control unit sends standard 1PPS pps pulse per second signals and B time code signals by interface unit to equipment under test,
For time synchronized.Main control unit receives the measured signal that equipment under test is sent.Record measured signal reach when (rising edge or
Trailing edge) at the time of：Read B timing codes and counter, obtain the moment day, when, minute, second, microsecond information.Should
As a result sent by interface unit to computer.
The punctual, specific workflow of time service precision test device based on satellite time service system that the utility model is provided
It is as follows：
1) system 1PPS standard seconds signal output interface is connected with equipment under test pulse per second (PPS) interface；System B timing codes are defeated
Outgoing interface is connected with equipment under test B timing code interfaces；By the characteristic signal output interface and the test interface of system of equipment under test
It is connected；
2) reception antenna is placed in outdoor ward, connection reception antenna to GPS/ Beidou receivers.Open 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, repeat step 2 are adjusted less than 4 or if locking failure) if locking satellite；
4) the 1PPS standards pps pulse per second signal and B time code signals that equipment under test reception system is sent；Wait equipment under test
Carry out time synchronized；After synchronously completing, output characteristic signal to system；
5) system recording feature signal reach (rising edge is effective or trailing edge the is effective) moment (including day, when, it is minute, second, micro-
Second information)；And the information is exported 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, it is test result to take maximum；
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 absolute value of the microsecond value of equipment under test record and the difference of system microsecond value had both been time service precision；Retest more than 3 times,
It is test result to take maximum；
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 small
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 both been punctual precision；Retest more than 3 times, it is test result to take maximum.
Claims (5)
1. a kind of punctual, time service precision test device based on satellite time service system, it is characterised in that：Including reception antenna, defend
Star signal receiver, interface unit, B codes demodulating unit, main control unit, sequential machine and delay PLL unit, computer and temperature
Compensate crystal oscillator；
The input of the satellite signal receiver is connected with reception antenna, and the output end of satellite signal receiver passes through interface list
Member is connected with B codes demodulating unit, main control unit and computer respectively；
The B codes demodulating unit is connected by interface unit with main control unit；
The main control unit is connected with equipment under test and computer respectively by interface unit；
The main control unit is connected by interface unit with equipment under test again after connection sequential machine and delay PLL unit；
The temperature-compensating crystal oscillator is connected with main control unit；
1PPS standard seconds signal output interface, B timing codes output interface and test interface are provided with the interface unit.
2. punctual, the time service precision test device according to claim 1 based on satellite time service system, 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 small
In 1 minute.
3. punctual, the time service precision test device according to claim 1 based on satellite time service system, it is characterised in that：
The interface unit has RS422 input/output interfaces, RS232 input/output interfaces, LVDS input/output interfaces and SMA inputs
Output interface；The delay of the SMA input/output interfaces is less than 5ns.
4. punctual, the time service precision test device according to claim 1 based on satellite time service system, it is characterised in that：
The working frequency of the temperature-compensating crystal oscillator is higher than 10MHz, and frequency temperature stability is ± 5ppm, and ageing rate is ± 5ppm/.
5. punctual, the time service precision test device according to claim 1 based on satellite time service system, it is characterised in that：
The satellite signal receiver, interface unit, B codes demodulating unit, main control unit, sequential machine and delay PLL unit and temperature
Compensation crystal oscillator is packaged in inside electric cabinet.
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| CN201621469772.0U CN206364812U (en) | 2016-12-29 | 2016-12-29 | A kind of punctual, time service precision test device based on satellite time service system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656451A (en) * | 2016-12-29 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Time-keeping and timing precision test device, time-keeping precision test method and timing precision test method based on satellite timing system |
-
2016
- 2016-12-29 CN CN201621469772.0U patent/CN206364812U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656451A (en) * | 2016-12-29 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Time-keeping and timing precision test device, time-keeping precision test method and timing precision test method based on satellite timing system |
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