CN103326802A - Wireless network system for achieving synchronous acquisition, synchronous acquisition device and method - Google Patents
Wireless network system for achieving synchronous acquisition, synchronous acquisition device and method Download PDFInfo
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Abstract
The invention discloses a wireless network system for achieving synchronous acquisition, a synchronous acquisition device and a method. The wireless network system for achieving synchronous acquisition comprises a master controller and n wireless data collection terminals (n is greater than or equal to 2). The synchronous acquisition device comprises a GPS receiver, a CPLD clock processing module and an analog digital converter. The method for achieving synchronous acquisition includes the steps that the data collection terminals are divided into a main data collection terminal and a plurality of assistant data collection terminals, the fact that all the data collection terminals are in a Ready state is confirmed before acquisition, then the master controller sends a Prestart order to the main data collection terminal, the main data collection terminal replies an OK order after receiving the Prestart order when the next PPS arrives, the master controller sends a Start order to all the data collection terminals after receiving the Prestart order, starting of all the data collection terminals at the same moment is achieved through the process, and synchronous acquisition is achieved ultimately.
Description
Technical field
The present invention relates to data acquisition technology, relate in particular to a kind of Radio Network System, synchronous acquisition device and method that realizes synchronous acquisition.
Background technology
Along with the development of network technology, based on the data acquisition system of wireless network, be applied to more and more in the real-time communication of industry spot.A lot of monitoring project monitoring points disperse, and have again the characteristics of real-time, for example earthquake, typhoon, traffic accident etc., and position Monitoring Data need to very correct time be synchronous for each.Only have the design parameter information synchronization to gather up, could be to monitoring target, operational environment carries out analysis-by-synthesis, judges exactly on-the-spot situation.General data acquisition technology is difficult to the monitoring requirement that reaches such, if do not adopt the synchronous acquisition technology, very likely cause the temporal slight error of each monitoring point image data, not only cause the inaccurate of monitoring result, also will seriously affect and research and analyse.
China Patent Publication No. CN1024972A, open day on June 13rd, 2012, name is called " the synchronous recognition device of a kind of data of many ADC high-speed data acquistion system ", this application case discloses a kind of many ADC high speed time interleaved acquisition system with the synchronous recognition function of data, measure phase relation between each adc data synchronised clock by data order identification module, realized the correct amalgamation in parallel time alternating sampling data and sampling time, its weak point be still can't the realization system in the synchronous acquisition of a plurality of terminals.
Chinese patent Granted publication CN101267291B, February 29 2012 Granted publication day, name is called " method, Radio Network System and the synchronizer of realizing synchronous acquisition ", after this patent adopts synchronizer to receive acquisition, obtain the current time, and add Preset Time as acquisition time with the current time, acquisition time and acquisition are sent to each wireless network node.Its weak point is: begins image data although realized each wireless network node at synchronization, realizes also needing the consistent of sample frequency synchronously, otherwise can't be synchronous; And the temporal information that comprises in the Frame is more, and the expense of Internet Transmission is larger, and then has affected the efficiency of transmission of whole network.
This shows, prior art is realizing that the same time starts the synchronous acquisition of finishing between synchronous data collection work and each wireless data acquisition terminal and also has some drawbacks.
Summary of the invention
The present invention has overcome shortcoming of the prior art, and a kind of Radio Network System, synchronous acquisition device and method that realizes synchronous acquisition is provided.
The present invention is a kind of in the wireless network data acquisition system, realizes the synchronous device and method of precision clock.Be mainly used in the synchronous acquisition between the wireless data acquisition terminal.
The invention provides a kind of Radio Network System of realizing synchronous acquisition, can realize that each wireless acquisition terminal starts simultaneously, and finish synchronous acquisition.
The present invention also provides a kind of apparatus and method that realize synchronous acquisition, can realize each wireless acquisition terminal synchronous acquisition.
In order to solve the technical problem of above-mentioned existence, the present invention is achieved by the following technical solutions:
A kind of Radio Network System of realizing synchronous acquisition, this system comprises: a master controller and n wireless data acquisition terminal (n 〉=2);
Described master controller is responsible for acquisition parameter and control command are sent to each wireless data acquisition terminal, coordinates each wireless data acquisition terminal of control and realizes synchronous acquisition;
Described wireless data acquisition terminal is used for being coordinated to finish synchronous data collection by described master controller, and image data is uploaded to described master controller.
A kind of synchronous acquisition device be used for to be realized the Radio Network System of synchronous acquisition, and this device is positioned at wireless data acquisition terminal inside, be used for realizing synchronous data collection.
Described synchronous acquisition device, it comprises gps receiver, CPLD clock processing module and one group of analog-digital converter (Analog Digital Converter is hereinafter to be referred as ADC);
Described gps receiver is responsible for the pulse signal that data collection station provides synchronised clock, adopts the 1PPS pulse that the clock signal of standard is provided;
The synchronization pulse that described CPLD clock processing module is responsible for that gps receiver is provided carries out frequency division to be processed, and produces high frequency clock signal and offers each ADC as the synchronized sampling clock, by control frequency multiplication value, carries out the adjustment of sampling clock; Under the prerequisite that satisfies the spot sampling frequency, improve the synchronizing characteristics of data collection station;
Described ADC is responsible for gathering the analog signal of industry spot and converts thereof into digital signal, and is controlled by CPLD clock processing module.
Can send sampling parameter to CPLD clock processing module by MCU at the master controller described in the Radio Network System of realizing synchronous acquisition, thereby realize the real-time adjusting of sample frequency.
The sampling parameter that CPLD clock processing module is obtained the transmission of MCU unit by bus communication interface is regulated on-the-spot actual samples frequency, the multi-channel A/D C that CPLD clock processing module is controlled this floor clamping simultaneously carries out synchronized sampling, and all synchronized samplings are triggered by the PPS pulse signal rising of GPS unit.After synchronized sampling started, sampling clock was calibrated by the PPS pulse per second (PPS), to reduce the accumulated error of sample frequency.
A kind of method that realizes synchronous acquisition for Radio Network System, the method content comprises:
In the synchronous acquisition Radio Network System, a plurality of wireless data acquisition terminals are divided into a main wireless data acquisition terminal and a plurality of from wireless data acquisition terminal, and stipulated the form of synchronous data collection control frame and Frame, be used for communicating by letter between master controller and the wireless data acquisition terminal;
Before master controller transmission instruction begins data acquisition, confirm that at first all wireless data acquisition terminals are in Ready(and prepare) state; Prepare in the situation that all wireless data acquisition terminals are in Ready() state, master controller at first sends a Prestart (pretrigger) instruction to main wireless data acquisition terminal; After described main wireless data acquisition terminal received Prestart (pretrigger) instruction, main wireless data acquisition terminal was replied the OK(affirmation when next rising edge arrives subsequently) to master controller; Master controller is received and is come autonomous wireless data acquisition terminal OK(to confirm) instruction after, send Start(to all wireless data acquisition terminals and begin) instruction; By increasing the agreement flow process of main wireless data acquisition terminal and master controller before starting in data acquisition, last all wireless data acquisition terminals trigger action when same rising edge arrives, the same moment of finishing the data data acquisition starts, and realizes the synchronous acquisition of data.
In the method for described synchronous data collection, described synchronous data collection control frame is to be made of Header (frame head), Type (instruction type) and Channel (channel) three parts, wherein, instruction type requires to be divided into Ready(according to transfer of data and prepares), Prestart (pretrigger), OK(confirm) and Start(begin) four kinds of instruction types, can assist thus and finish synchronous data collection.
In the method for described synchronous data collection, the Frame of described synchronous data collection, comprise Mark (timestamp) and Data segment (data segment) two parts, timestamp is by the time series of counter generation cycle, such as the time series of 8 digit counters generation 0～255, the data of the time series of sampling each time and correspondence are left respectively in Mark (timestamp) and Data segment (data segment) is inner.Master controller is processed according to time series after receiving data.
Because adopt technique scheme, the present invention compared with prior art has such beneficial effect:
The present invention need not to carry out wireless data acquisition terminal clock and UTC calibration of clock and can realize be easy to realize, and the synchronous acquisition toggle speed being synchronous data collection between a plurality of terminals fast, to MCU performance in the wireless data acquisition terminal require low; Timestamp in this scheme reduced data frame promotes the valid data amount in the transfer of data; The adjusting that the frequency of synchronized sampling can be real-time in this scheme in addition has good flexibility.
Description of drawings
Fig. 1 is the Radio Network System block diagram of realization synchronous acquisition of the present invention;
Fig. 2 is synchronous acquisition device schematic diagram of the present invention;
Fig. 3 is of the present invention for Radio Network System realization synchronous collection method flow chart;
Fig. 4 is data acquisition control frame and data format;
Fig. 5 is the synchronous data collection sequential chart.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Shown in Figure 1 is the Radio Network System block diagram of realization synchronous acquisition of the present invention.The Radio Network System of realizing synchronous acquisition is comprised of three wireless data acquisition terminals and a master controller, three wireless data acquisition terminals have formed a kind of star-network topological structure according to the actual demand of industry spot, realize the work to industry spot data acquisition and processing.Master controller is the PC host computer, is used for coordinating three wireless data acquisition terminals of control, and carries out the processing of image data; Each wireless data acquisition terminal forms by data processor, wireless communication module and synchronous acquisition device, and wherein, wireless communication module is used for the wireless transmission of realization and master controller.
As shown in Figure 2, synchronous acquisition device of the present invention comprises gps receiver, CPLD clock processing module and ADC.Gps receiver wherein is signal source of clock, partly is made of antenna, receiving processor, high stable clock etc., is responsible for wireless data acquisition terminal synchronous clock pulse signal is provided; The precision of gps receiver time service module is high, can produce the synchronous time service up to the ns level, with the sequential output of pulse of per second or 100 pulses each second, can improve the validity and reliability of system acquisition performance.ADC is responsible for gathering the analog signal of industry spot and converts thereof into digital signal, and is controlled by CPLD clock processing module.CPLD clock processing module is CPLD, and it carries out process of frequency multiplication with the pulse signal that gps receiver provides, thereby improves the sample frequency of wireless data acquisition terminal, and can adjust in real time.CPLD clock processing module is internal logic and the pin of self-defining device on request, has effectively strengthened the flexibility of design, has reduced the quantity of chip, has dwindled the volume of wireless data acquisition terminal, has improved the Performance And Reliability of system.
Fig. 3 is of the present invention for Radio Network System realization synchronous collection method flow chart, the Radio Network System of realization synchronous acquisition of the present invention is divided into a main wireless data acquisition terminal and two from wireless data acquisition terminal with wireless data acquisition terminal, by increasing the agreement flow process of main wireless data acquisition terminal and master controller before starting in data acquisition, can realize that the clock synchronous of three wireless data acquisition terminals reaches the startup of finishing at one time synchronous data collection.
Before master controller transmission instruction begins data acquisition, confirm that at first all wireless data acquisition terminals are in Ready(and prepare) state; Prepare in the situation that all wireless data acquisition terminals are in Ready() state, master controller at first sends a Prestart (pretrigger) instruction to main wireless data acquisition terminal; After described main wireless data acquisition terminal receives Prestart (pretrigger) instruction, when next rising edge arrives, reply OK(and confirm) to master controller; Master controller is received and is come autonomous wireless data acquisition terminal OK(to confirm) instruction after, send Start(to all wireless data acquisition terminals and begin) instruction; All wireless data acquisition terminals trigger action when next rising edge arrives is finished the startup of synchronous data collection at last.
Fig. 4 is the sequential chart that synchronous data collection starts, and wherein Fig. 4 (a) is failed synchronous data collection communication sequential chart, and Fig. 4 (b) starts sequential chart for the present invention can avoid the collection of synchronization failure.Wireless data acquisition terminals all among Fig. 4 (a) are after receiving the data communication instruction, and trigger action when the rising edge of next standard clock signal arrives starts synchronous data collection.Yet there is time delay during a plurality of wireless data acquisition terminal received communication instruction, different wireless data acquisition terminals can not guarantee to receive at synchronization the instruction of synchronous acquisition, might before and after the rising edge of same standard clock signal, receive the instruction that starts collection, therefore can not guarantee to carry out synchronous collection.As shown in Figure 4 (a), as wireless data acquisition terminal 1(WDAT1) constantly receive instruction at t1, trigger action when first rising edge arrives then; Wireless data acquisition terminal 2(WDAT2) constantly receive instruction at t2 because be engraved in after the rising edge of first triggering during t2, WDAT2 can only be when second rising edge arrives triggering command.So more synchronous data acquisition of synchronization startup of WDAT1 and WDAT2.
Fig. 4 (b) starts sequential chart for the collection that the present invention optimizes.Confirming that all wireless data acquisition terminals are in Ready(and prepare) state lower time, main wireless data acquisition terminal receives Prestart (pretrigger) instruction, and replys an OK(to master controller and confirm when the rising edge of next standard time clock pulse) instruction; Confirm when the center controller receives OK() after the instruction, send Start(to all data collection stations at once and begins) instruction; Main wireless data acquisition terminal receives Start(constantly at t3 to begin) instruction, constantly receive the Start(at t4 from wireless data acquisition terminal) instruction, two WDAT receive start(to begin) time of delay of order be respectively Δ t1 and Δ t2, delay time is far smaller than the time difference of two pulse signals in the clock signal, data collection station can not occur and start to do when the rising edge of various criterion clock touches.By before data acquisition, increasing the communication protocol flow of main wireless data acquisition terminal and master controller, can realize between three wireless data acquisition terminals in the same absolute moment startup synchronous data collection.
Fig. 5 is data acquisition control frame and data format.The left side is the control command frame format, is made of Header (frame head), Type (instruction type) and Channel (channel) three parts.Instruction type requires to be divided into Ready(according to transfer of data and prepares), Prestart (pretrigger), OK(confirm) and Start(begin) four kinds of instruction types, respectively corresponding 000,001,010,011 character format can realize the coordination control in the communication transmission process thus.
The right side is the form of sample data frames among the figure, comprises Mark (timestamp) and Data segment (data segment) two parts.The system clock of wireless data acquisition terminal is 8 digit counters among the present invention, and signal circulation timei of 256 samplings is provided, and wireless data acquisition terminal is according to 0～255 sequential loop image data, and 255 represent one-period finishes.The temporal information of sampling and corresponding data are left in respectively among Mark (timestamp) and the Data segment (data segment) each time.Frame transmits between wireless data acquisition terminal and master controller by wireless network, and master controller is finished synchronous data collection by the information of Mark (timestamp) in the resolution data frame and Data segment (data segment).
Owing to carrying out synchronous acquisition between the wireless data acquisition terminal, therefore after master controller receives the sampled data bag, only need to store according to time series, can process and analyze the data of synchronous acquisition, precise time stamp information is added after also can being calculated by master controller, and the synchronous data collection Startup time receives Ready(at master controller and prepares) next second after the instruction.
Embodiment by the invention described above can find out, method and the synchronizer of the realization synchronous acquisition that the embodiment of the invention provides, can effectively realize a plurality of data collection stations of Radio Network System synchronous carry out data acquisition.
Claims (5)
1. Radio Network System of realizing synchronous acquisition, it is characterized in that: this system comprises: a master controller and n wireless data acquisition terminal (n 〉=2);
Described master controller is responsible for acquisition parameter and control command are sent to each wireless data acquisition terminal, coordinates each wireless data acquisition terminal of control and realizes synchronous acquisition;
Described wireless data acquisition terminal is used for being coordinated to finish synchronous data collection by described master controller, and image data is uploaded to described master controller.
2. synchronous acquisition device, it is characterized in that: it comprises gps receiver, CPLD clock processing module and analog-digital converter (Analog Digital Converter is hereinafter to be referred as ADC);
Described gps receiver is responsible for the pulse signal that data collection station provides synchronised clock, adopts the 1PPS pulse that the clock signal of standard is provided;
The synchronization pulse that described CPLD clock processing module is responsible for that gps receiver is provided carries out frequency division to be processed, and produces high frequency clock signal and offers ADC as the synchronized sampling clock, by control frequency multiplication value, carries out the adjustment of sampling clock; Under the prerequisite that satisfies the spot sampling frequency, improve the synchronizing characteristics of data collection station;
Described ADC is responsible for gathering the analog signal of industry spot and converts thereof into digital signal, and is controlled by CPLD.
3. one kind is used for the method that Radio Network System is realized synchronous acquisition, and it is characterized in that: the method content comprises:
In the synchronous acquisition Radio Network System, a plurality of data collection stations are divided into a master data collection terminal and a plurality of from data collection station, and stipulated the form of synchronous data collection control frame and Frame, be used for communicating by letter between master controller and the data collection station;
Before master controller transmission instruction begins data acquisition, confirm that at first all data collection stations are in Ready(and start) state; Prepare in the situation that all data collection stations are in Ready() state, master controller at first sends a Prestart (pretrigger) instruction to the master data collection terminal; After described master data collection terminal received Prestart (pretrigger) instruction, the master data collection terminal was replied the OK(affirmation when next rising edge arrives subsequently) to master controller; Master controller receives independent data acquisition terminal OK(to confirm) instruction after, send Start(to all data collection stations and begin to gather) instruction; By increasing the agreement flow process of master data collection terminal and master controller before starting in data acquisition, last all data collection stations trigger action when same rising edge arrives, the same moment of finishing the data data acquisition starts, and realizes the synchronous acquisition of data.
4. the method for the collection of a kind of Radio Network System for realizing synchronous acquisition according to claim 3, it is characterized in that: described synchronous data collection control frame is to be made of Header (frame head), Type (instruction type) and Channel (channel) three parts, wherein, instruction type requires to be divided into Ready(according to transfer of data and prepares), Prestart (pretrigger), OK(confirm) and Start(begin collection) four kinds of instruction types, can assist thus and finish synchronous data collection.
5. the method for the collection of a kind of Radio Network System for realizing synchronous acquisition according to claim 3, it is characterized in that: the Frame of described synchronous data collection, comprise Mark (timestamp) and Datasegment (data segment) two parts, timestamp is by the time series of counter generation cycle, such as the time series of 8 digit counters generation 0～255, the data of the time series of sampling each time and correspondence are left respectively in Mark (timestamp) and Data segment (data segment) is inner.
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| CN109586832A (en) * | 2018-12-14 | 2019-04-05 | 广州智光自动化有限公司 | Wireless synchronization method, wireless slave, wireless host and wireless synchronization master |
| CN109586832B (en) * | 2018-12-14 | 2023-11-14 | 广州智光自动化有限公司 | Wireless synchronization method, wireless slave, wireless master and wireless synchronization system |
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| CN112416289A (en) * | 2020-11-12 | 2021-02-26 | 北京字节跳动网络技术有限公司 | Audio synchronization method, device, equipment and storage medium |
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