CN106788843A - A kind of GPS synchronous method of distributed test system - Google Patents
A kind of GPS synchronous method of distributed test system Download PDFInfo
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- CN106788843A CN106788843A CN201611126357.XA CN201611126357A CN106788843A CN 106788843 A CN106788843 A CN 106788843A CN 201611126357 A CN201611126357 A CN 201611126357A CN 106788843 A CN106788843 A CN 106788843A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
Abstract
The present invention discloses a kind of GPS synchronous method of distributed test system, application of the method towards current main-stream distributed test system, solve in transient signal test, distributed test system physically disperses to isolate and cause and be difficult to synchronous problem each other caused by each measuring point works independently.The method can be designed by accurate measurement the PPS pulse signals that produce of GPS synchronization units and received measured signal between time difference, each measuring point is uploaded to computer after measuring the time difference respectively together with UTC time, and the time unification on the basis of PPS pulses is set up on computers.GPS synchronization units designed by the present invention include GPS time service modules, control chip FPGA and high accuracy real-time clock, eeprom memory, USB interface etc..The present invention solves the outstanding problems such as reliability present in wired synchronization is low, quantities is big suitable for the synchronization of distributed test system under the free environments of field in wireless synchronization mode, the method high precision, it is simple to operate, be easy to Project Realization.
Description
Technical field
The invention belongs to distributed test system synchronous method technical field, and in particular to a kind of distributed test system
GPS synchronous method.The method is suitable for solving the stationary problem that each distributed measuring point in experiment is injured by warhead.
Background technology
Transient signal is widely present in the mechanism of warhead, such as blast pressure signal, impact shock signal, its
Measure has directive significance to the development of weapon warhead.Transient signal is a single pass, and the duration is short, sphere of action
Extensively, it is more difficult to measure.Distributed test system due to the degree of accuracy higher, reliability and applicability, as current main
Transient signal means of testing.In actual applications, according to the sphere of action of transient signal, typically will be in testing ground by a set pattern
Several distributed measuring points are then laid, the course that transient signal is changed over time in the point is recorded respectively.Because each measuring point is in sky
Between on dispersiveness, cause what they were physically entirely isolated, work independently each other, do not possess unified time base
It is accurate.Should " time " be only each although this method of testing can well complete the record that each measuring point signal is changed over time
The relative time of individual measuring point, lost the overall concept of time that transient signal acts on live all measuring points, cause entirely making
Cannot be realized with the propagation law of research signal in region.Therefore, the simultaneous techniques of research Based on Distributed test system has
Notable meaning.
The synchronous method of existing Distributed Measurement System mainly has：Wired synchronization method and phototiming method.Wired synchronization method
It is used to solve the stationary problem between each measuring point of distributed test system earliest, party's law theory is simple, but needs in each measuring point
Between connection cable, warhead injure experiment in need close protection, it is to avoid fragmentation hit cause failure, this can to lay
The occasion that measuring point is more, measuring distance is remote brings great protection works amount, it is impossible to large-scale use.Optical signal Synchronos method is fighting
The blast light in portion cannot exclude the interference of sunshine or reflected light to light-sensitive element as synchronizing signal, in practical application, it is difficult to
It is accurate to obtain required synchronizing signal.
The content of the invention
Present invention aim to address existing distributed test system synchronous method be difficult in large-scale engineering realize,
A kind of technical problem of anti-interference difference, there is provided synchronous method of the distributed test system based on GPS simultaneous techniques.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of GPS synchronous method of distributed test system, using following step realize between each distributed measuring point when
Base is unified：
1) produced using GPS time service modules and export two kinds of data, one kind is PPS pulse signals, and another kind is and each
UTC time t (Coordinated Universal Time(UTC)) in the corresponding serial data of PPS pulse signals；
2) the UTC time t that GPS time service modules are produced is extracted and cached using FPGA (field programmable gate array)；
3) it is initial timing signal with PPS pulse signals, is stopping timing signal with measured signal：
If i. coming interim in next PPS pulses, measured signal is not still arrived, then the clearing in FPGA is counted and thought highly of
New to start new round counting, counter is constantly in the cycle count for resetting and counting and reset count again again before measured signal arrival
State；
Once ii. measured signal arrives, the counter in FPGA stops counting, and current count value is that measured signal rises
Time difference Δ t between edge and the preceding PPS rising edge of a pulse of measured signal arrival, FPGA deposit time difference Δ t
Come；
4) by time difference Δ t UTC time ts corresponding with a PPS pulse before measured signal0After integration, EEPROM is stored in
Memory；
5) computer reads time difference the Δ t and UTC time t of each distributed measuring point0Afterwards, processed by host computer, built
Erect the when system on the basis of PPS pulses.
The step 2) the middle concrete operation step for extracting and caching the UTC time t that GPS time service modules are produced using FPGA
For：UART serial communication protocols are integrated into FPGA, carrying out data using standard asynchronous transmitting-receiving mode and GPS time service modules leads to
Letter；In the case where baud rate is consistent, the serial communication of both sides is completed according to the serial data frame format of GPS time service modules,
Corresponding UTC time t is obtained after each PPS pulse, and is stored in internal register.
The step 4) in by time difference Δ t UTC time ts corresponding with a PPS pulse before measured signal0The tool of integration
Body operating procedure is：After waiting trigger signal to produce, FPGA is first read to internal deposit the time difference Δ t of latch
Device, then reads the UTC time t for being stored in internal register0, by UTC time when, minute, second byte and embody the time
3 data bytes of difference DELTA t are sequentially stored into eeprom memory by weights height, to electricity under GPS time service modules, complete once
Synchronizing process.
The step 5) Computer reads time difference the Δ t and UTC time t of each distributed measuring point0Afterwards, by with
The host computer treatment programmed based on Labview, it is established that the when system on the basis of PPS pulses.Computer is to each measuring point synchronization
The specific process step of data is：Each measuring point is stored by the time data in EEPROM by USB interface and is uploaded to calculating
Machine；By the UTC time of each measuring point of interpretation, confirm whether the time difference of each measuring point record is based on same PPS pulses；If going out
The situation of existing non-same PPS pulses, all to be initial timing signal with the 2nd PPS pulse add 1s the time difference that records；
On the basis of PPS pulses, the time that measured signal travels to each measuring point is established according to time difference, so as to be built in all measuring points
Erect the when system on the basis of PPS pulses.
The present invention uses above technical scheme, and compared with background technology, the present invention has advantages below：
1) relative to wired synchronization and phototiming method, with more versatility and applicability, distributed testing system is solved
System nonsynchronous problem caused by its dispersion physically is isolated；
2) on the basis of based on GPS time service modules, it is contemplated that the automatic satellite, automatic of scanning for after time service module start
Positioning, but serial ports will not give tacit consent to the phenomenon of output navigator fix information, and according to the Serial Port Information that user needs, control chip is being awarded
When module go up electricity every time before all it is initialized, synchronous efficiency is substantially increased using the method；
3) use of synchronous triggering device is reduced relative to wired synchronization, in experiment, with wireless synchronization mode avoid because
The asynchronous problem that its damage is caused, using the method high precision, method is simple, be easy to Project Realization；
4) for may be influenceed by factors such as satellite losing lock, severe weather conditions in actually used, PPS pulses may
There is the larger problem of unstable or error, the present invention proposes the module differentiated using the integrated PPS pulses in FPGA, make full
The PPS pulses of sufficient precision could be exported, and improve the accuracy of PPS pulse signals.
The present invention, based on the principle of GPS simultaneous techniques, is used on the basis of traditional distributed test system synchronous method
Time precision GPS time service modules higher obtain PPS pulse signals UTC time corresponding with each pulse signal, using control
Chip is cached and processed to both differences, and rules integration is pressed with UTC time, the covering set up on the basis of PPS pulses
The when system of all measuring points.
Brief description of the drawings
Fig. 1 is synchronization unit structural representation of the invention；
Fig. 2 is handling process schematic diagrames of the FPGA of the present invention to GPS output informations；
Fig. 3 is the structural representation that the present invention differentiates to PPS pulses；
Fig. 4 is that FPGA of the present invention integrates schematic diagram to time difference with corresponding UTC time；
Fig. 5 is handling process schematic diagram of the computer of the present invention to each measuring point synchrodata.
Specific embodiment
The invention is described in further detail below in conjunction with Figure of description.
A kind of GPS synchronous method of distributed test system that the present invention is provided, specific embodiment is as follows：
1) produced using GPS time service modules and export two kinds of data, one kind is PPS pulse signals, and another kind is and each
UTC time t in the corresponding serial data of PPS pulse signals.As shown in figure 1, the PPS pulses that produce of GPS time service modules and existing
Measured signal is input in FPGA, live measured signal be export and pass through follow-up conditioning by sensor and Acquisition Circuit change and
Into data signal, the partial circuit is not belonging to synchronization unit, do not embodied in figure；
2) the UTC time t that GPS time service modules are produced is extracted and cached using FPGA, and concrete operation step is：
I. UART serial communication protocols are integrated into FPGA, are entered with GPS time service modules using standard asynchronous transmitting-receiving mode
Row data communication.Operating procedure is as shown in Figure 2：Internal UART is initialized, baud rate is set with GPS time service modules
Serial port baud rate is consistent.For example, the baud rate of this time service module is 9600bps, then using the frequency division module of FPGA, by UART's
Baud rate is set to 9600bps, and now GPS time service modules match with the data communication rates of UART；
Ii. in the case where baud rate is consistent, the serial of both sides is completed according to the serial data frame format of GPS time service modules
Communication, obtains corresponding UTC time t, and be stored in internal register after each PPS pulse.Operating procedure is：
A. initialization command is sent to GPS time service modules；
B. time delay for a period of time, waits gps signal stabilization；
C. judge and wait PPS pulses to arrive, structure is as shown in Figure 3：
A. use high accuracy real-time clock that clock signal is provided for FPGA, PPS pulse signals are accessed in FPGA by pin；
B. the internal counter using 24 is counted to two adjacent PPS pulse signals：If two PPS pulses letters
The time interval of number rising edge shows that GPS time service modules have been accurately positioned and can outputting standard within 1s ± 200ns, then
PPS pulses；Conversely, then counting again；
If c. continuous 4 PPS pulses are standard PPS pulses, differentiate that enable bit en puts height, as long as PPS pulses afterwards
Meet the requirement of time interval, will directly export；If conversely, undesirable, en sets low, and no pulse output, reset resets
After re-start judgement；
D. inquire about and wait the serial data from GPS time service modules；
E. serial data is received, UTC time data therein is extracted afterwards and internal register is buffered into；
F. the arrival of next PPS pulses is waited；
3) it is initial timing signal with PPS pulse signals, is stopping timing signal with measured signal：
If i. coming interim in next PPS pulses, measured signal is not still arrived, then the clearing in FPGA is counted and thought highly of
New to start new round counting, counter is constantly in the cycle count for resetting and counting and reset count again again before measured signal arrival
State；
Once ii. measured signal arrives, the counter in FPGA stops counting, and current count value is that measured signal rises
Time difference Δ t between edge and the preceding PPS rising edge of a pulse of measured signal arrival, FPGA deposit time difference Δ t
Come；
4) by time difference Δ t UTC time ts corresponding with a PPS pulse before measured signal0After integration, EEPROM is stored in
Memory.Concrete operation step is as shown in Figure 4：
I. trigger signal is produced after the blast of waiting signal source；
Ii.FPGA reads to internal register the time difference Δ t between the PPS pulses and measured signal of latch；
Iii.FPGA reads the UTC time t for being stored in internal register0；
Iv. by UTC time when, minute, second byte and embody 3 data bytes of time difference Δ t to press weights high
It is low to be sequentially stored into eeprom memory；
V. to electricity under GPS time service modules, a synchronizing process is completed.
5) computer reads time difference the Δ t and UTC time t of each distributed measuring point0Afterwards, by with Labview as base
The host computer treatment of plinth programming, it is established that the when system on the basis of PPS pulses.Computer is treated to each measuring point synchrodata
Journey is as shown in Figure 5：
I. each measuring point such as A, B, C, D are stored by the time data in EEPROM by USB interface and is uploaded to calculating
Machine；
Ii. by the UTC time of each measuring point of interpretation, confirm whether the time difference of each measuring point record is based on same PPS
Pulse；
It is all to be recorded for starting timing signal with the 2nd PPS pulse if iii. there is the situation of non-same PPS pulses
Time difference add 1s.Tetra- measuring points of A, B, C, D lay synchronization unit respectively, and its performance is tested repeatedly, record quilt
Survey the previous corresponding UTC time t of PPS pulse signals of signal arrival0And four error amounts of measuring point.Each synchronization unit note
The test data of record as shown in table 1, error amount in Microsecond grade, when now tetra- measuring points of A, B, C, D have possessed unified PPS pulses
Between benchmark；
Iv. on the basis of PPS pulses, the time that measured signal travels to each measuring point is established according to time difference, so that
United when all measuring points are set up on the basis of PPS pulses.
1 four test datas of synchronization unit of table
Claims (4)
1. the GPS synchronous method of a kind of distributed test system, it is characterised in that：Distributed testing is carried out using following step
The GPS synchronizations of system：
1) produced using GPS time service modules and export two kinds of data, one kind is PPS pulse signals, and another kind is and each PPS arteries and veins
The UTC time t rushed in the corresponding serial data of signal；
2) the UTC time t that GPS time service modules are produced is extracted and cached using FPGA；
3) it is initial timing signal with PPS pulse signals, is stopping timing signal with measured signal：
If i. coming interim in next PPS pulses, measured signal is not still arrived, then the clearing counter in FPGA is opened again
A beginning new round is counted, and counter is constantly in the cycle count shape for resetting and counting and reset count again again before measured signal arrival
State；
Once ii. measured signal arrives, counter in FPGA stops counting, current count value be measured signal rising edge with
Time difference Δ t between the preceding PPS rising edge of a pulse of measured signal arrival, FPGA get up time difference Δ t storages；
4) by time difference Δ t UTC time ts corresponding with a PPS pulse before measured signal0After integration, EEPROM storages are stored in
Device；
5) computer reads time difference the Δ t and UTC time t of each distributed measuring point0Afterwards, processed by host computer, it is established that with
When system on the basis of PPS pulses.
2. a kind of GPS synchronous method of distributed test system according to claim 1, it is characterised in that the step
2) in use FPGA extract and cache GPS time service modules produce UTC time t concrete operation step for：UART is serially led to
Letter protocol integration enters row data communication using standard asynchronous transmitting-receiving mode in FPGA with GPS time service modules；It is consistent in baud rate
In the case of, the serial communication of both sides is completed according to the serial data frame format of GPS time service modules, after each PPS pulse
Corresponding UTC time t is obtained, and is stored in internal register.
3. a kind of GPS simultaneous techniques of distributed test system according to claim 1, it is characterised in that the step
4) by time difference Δ t UTC time ts corresponding with a PPS pulse before measured signal in0The concrete operation step of integration is：Deng
After signal to be triggered is produced, FPGA is first read to internal register the time difference Δ t of latch, is then read and has been stored in
The UTC time t of internal register0, by UTC time when, minute, second byte and embody 3 data words of time difference Δ t
Section is sequentially stored into eeprom memory by weights height, to electricity under GPS time service modules, completes a synchronizing process.
4. a kind of GPS simultaneous techniques of distributed test system according to claim 1, it is characterised in that the step
5) Computer reads time difference the Δ t and UTC time t of each distributed measuring point0Afterwards, programmed by based on Labview
Host computer treatment, it is established that on the basis of PPS pulses when unite.Specific process step of the computer to each measuring point synchrodata
For：Each measuring point is stored by the time data in EEPROM by USB interface and is uploaded to computer；By each measuring point of interpretation
UTC time, confirm whether the time difference of each measuring point record is based on same PPS pulses；If there are the feelings of non-same PPS pulses
Condition, all to be initial timing signal with the 2nd PPS pulse add 1s the time difference that records；On the basis of PPS pulses, root
The time that measured signal travels to each measuring point is established according to time difference, so as to be set up with PPS pulses as base in all measuring points
Accurate when system.
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| CN108562800A (en) * | 2018-05-07 | 2018-09-21 | 西安交通大学 | The pulse electromagnetic field measurement device and method that nanoseconds are differentiated |
| CN108693410A (en) * | 2018-05-07 | 2018-10-23 | 西安交通大学 | Big regional pulse electromagnetic field radiation spatial and temporal distributions parameter measurement system and measurement method |
| CN108847921A (en) * | 2018-07-06 | 2018-11-20 | 哈尔滨工业大学（深圳） | Distribution vibration continuous monitor system |
| CN109031368A (en) * | 2018-07-19 | 2018-12-18 | 大连理工大学 | Method for reading GPS receiving output effective data by combining PPS signal |
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| CN112630567A (en) * | 2020-12-14 | 2021-04-09 | 山东核电有限公司 | Automatic response time testing scheme based on FPGA technology |
| CN112821974A (en) * | 2020-11-23 | 2021-05-18 | 北京经纬恒润科技股份有限公司 | High-precision time synchronization method and device for vehicle-mounted ECU |
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| CN108693410B (en) * | 2018-05-07 | 2020-07-17 | 西安交通大学 | Large-area pulsed electromagnetic field radiation space-time distribution parameter measuring system and measuring method |
| CN108693410A (en) * | 2018-05-07 | 2018-10-23 | 西安交通大学 | Big regional pulse electromagnetic field radiation spatial and temporal distributions parameter measurement system and measurement method |
| CN108562800A (en) * | 2018-05-07 | 2018-09-21 | 西安交通大学 | The pulse electromagnetic field measurement device and method that nanoseconds are differentiated |
| CN108847921A (en) * | 2018-07-06 | 2018-11-20 | 哈尔滨工业大学（深圳） | Distribution vibration continuous monitor system |
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| CN111756593A (en) * | 2019-03-28 | 2020-10-09 | 北京米文动力科技有限公司 | Self-testing method and testing method for synchronization precision of time synchronization system |
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| CN112821974A (en) * | 2020-11-23 | 2021-05-18 | 北京经纬恒润科技股份有限公司 | High-precision time synchronization method and device for vehicle-mounted ECU |
| CN112821974B (en) * | 2020-11-23 | 2023-01-24 | 北京经纬恒润科技股份有限公司 | High-precision time synchronization method and device for vehicle-mounted ECU |
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