CN101232520A - Method for implementing synchronizing collection, wireless sensor network system and synchronizing apparatus - Google Patents
Method for implementing synchronizing collection, wireless sensor network system and synchronizing apparatus Download PDFInfo
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Abstract
The embodiment of the invention provides a method for implementing synchronization acquisition, a wireless sensor network system and a synchronization device. Every wireless sensor network node of the wireless sensor network system collects data; a synchronization device of the wireless sensor network system receives the trigger message which is sent to every wireless sensor network node; every wireless sensor network node begins to transmit or store the valid data which is collected by the wireless sensor network node after the wireless sensor network system receives the trigger message. The time when the synchronization device receives the trigger message is unique, so the wireless sensor network node collecting data at the same time can be realized.
Description
Technical field
The present invention relates to data acquisition technology, particularly realize method, wireless sensor network system and the synchronizer of synchronous acquisition.
Background technology
Wireless sensor network system is when carrying out data acquisition, host computer sends acquisition by Centroid or gateway to each wireless sensor network node, after wireless sensor network node receives acquisition, the beginning image data, and as required the data of gathering are transmitted or stored.
No matter adopt broadcasting or query mode, the wireless sensor network node that receives order all can produce receive time delay.Wireless sensor network topology for multi-hop, the time delay that acquisition arrives the tip wireless sensor network node will become big along with the increase of jumping figure, thereby each wireless sensor network node receives that the time of acquisition is uneven, and the time that causes each wireless sensor network node to begin to gather is inconsistent.
At present existing multiple time synchronized algorithm is applied in the synchronous acquisition technology, inundation time synchronization protocol (FTSP for example, Flooding Time Synchronization Protocol), the time synchronized (RBS of Reference News, Reference Broadcast Synchronization), latency measurement time synchronized (DMTS, Delay Measurement Time Synchronization) and wireless sensor network time synchronization protocol (TPSN, Timing-Sync Protocol for Sensor Networks) or the like.Realize that wireless sensor network node is consistent with the clock of Centroid or gateway though can adopt the time synchronized algorithm, so that in the subsequent treatment data of gathering are alignd, but, can't guarantee the time synchronized image data of each wireless sensor network node at some needs because acquisition arrives the inconsistent problem of time of each wireless sensor network node.
This shows that prior art can't realize that each wireless sensor network node is in the synchronization image data.
Summary of the invention
The embodiment of the invention provides a kind of method that realizes synchronous acquisition, can realize that each wireless sensor network node is in the synchronization image data.
The embodiment of the invention also provides a kind of wireless sensor network system of realizing synchronous acquisition, can realize that each wireless sensor network node is in the synchronization image data.
The embodiment of the invention also provides a kind of synchronizer of realizing synchronous acquisition, can realize that each wireless sensor network node is in same absolute moment image data.
Below the technical scheme that provides for the embodiment of the invention:
A kind of method that realizes synchronous acquisition, this method comprises:
Each wireless sensor network node image data of wireless sensor network system;
The synchronizer of wireless sensor network system receives and triggers message, and described triggering message is sent to each wireless sensor network node;
Described each wireless sensor network node begins transmission or storage valid data, and described valid data are the data that wireless sensor network node is gathered after wireless sensor network system receives triggering message.
A kind of wireless sensor network system of realizing synchronous acquisition, this system comprises: host computer, synchronizer and wireless sensor network node;
Described host computer is used for sending acquisition to synchronizer;
Described synchronizer is used for the acquisition from host computer is sent to wireless sensor network node, receive the triggering message that the external network system sends when externally network node begins image data simultaneously, described triggering message is sent to each wireless sensor network node;
Described wireless sensor network node is used to receive the acquisition of self-synchronous device, begin image data after receiving described acquisition, after receiving described triggering message, begin transmission or storage valid data, described valid data are the data that wireless sensor network node is gathered after synchronizer receives triggering message.
A kind of synchronizer of realizing synchronous acquisition, this synchronizer comprises: time module, processing module and trigger module;
Described time module is used to obtain the current time;
Described processing module is used to receive the acquisition from host computer, the current time that described acquisition and time module are obtained is sent to wireless sensor network node, receive triggering message by trigger module, and extract the current time that described time module is obtained, the described current time is sent to each wireless sensor network node together as triggered time and described triggering message;
The triggering message that described trigger module is used for receiving is sent to processing module.
From technique scheme as can be seen, method, wireless sensor network system and the synchronizer of the realization synchronous acquisition that the embodiment of the invention provides, each wireless sensor network node begins image data in advance, after receiving triggering message, begin transmission or storage valid data again, described valid data are the data that wireless sensor network node is gathered after synchronizer receives triggering message.Because it is unique that synchronizer receives the time of triggering message, therefore, can realize that each wireless sensor network node is in the synchronization image data.
Description of drawings
The method flow diagram of the realization synchronous acquisition that Fig. 1 provides for the embodiment of the invention one;
The method flow diagram of the realization synchronous acquisition that Fig. 2 provides for the embodiment of the invention two;
The structure chart of the wireless sensor network system of the realization synchronous acquisition that Fig. 3 provides for the embodiment of the invention three.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
First embodiment:
The method flow diagram of the realization synchronous acquisition that Fig. 1 provides for the embodiment of the invention.As shown in Figure 1:
Step 101: each wireless sensor network node image data of wireless sensor network system.
This step can realize in the following ways:
The host computer of wireless sensor network system sends the synchronizer of acquisition to wireless sensor network system;
Described synchronizer with the acquisition that receives after, obtain the current time, and each wireless sensor network node that the acquisition that receives and current time are sent to wireless sensor network system;
Described each wireless sensor network node receives described acquisition and after the current time, begins image data.
Step 102: the synchronizer of wireless sensor network system receives and triggers message, and described triggering message is sent to each wireless sensor network node.
This step can specifically realize in the following ways:
The synchronizer of wireless sensor network system receives described triggering message;
After described synchronizer receives described triggering message, obtain the current time, the described current time is sent to described each wireless sensor network node together as triggered time and the triggering message that receives.
The above triggers the triggering message that message is the wireless sensor network node transmission of described wireless sensor network system inside, perhaps the triggering message that sends when externally network node begins image data simultaneously for the external network system.
In the present embodiment, trigger message and can adopt trigger impulse to realize.
Step 103: each wireless sensor network node begins transmission or storage valid data, and described valid data are the data that wireless sensor network node is gathered after wireless sensor network system receives triggering message.
This step can specifically realize in the following ways:
Each wireless sensor network node receives triggering message and the triggered time from the synchronizer of described wireless sensor network system;
Each wireless sensor network node receives described triggering message and after the triggered time, with the data deletion of gathering before the described triggered time, be retained in the data of gathering after the described triggered time, and the data of described reservation are transmitted as valid data or store.
Can adopt one of following three kinds of modes to obtain the current time:
Mode one: synchronizer obtains current satellite time by GPS, with described current satellite time as the current time;
Mode two: synchronizer obtains current fiducial time by the time reference circuit of building with crystal oscillator, with described current fiducial time as the current time;
Mode three: synchronizer obtains the current Ethernet time by Ethernet, with the described current Ethernet time as the current time.
Second embodiment:
The method flow diagram of the realization synchronous acquisition that Fig. 2 provides for the embodiment of the invention.As shown in Figure 2:
Step 201: the host computer of wireless sensor network system sends the synchronizer of acquisition to wireless sensor network system.
Step 202: synchronizer with the acquisition that receives after, obtain the current time, and each wireless sensor network node that the acquisition that receives and current time are sent to wireless sensor network system.
Step 203: wireless sensor network node receives described acquisition and after the current time, begins image data.
In this step, wireless sensor network node is receiving described acquisition and after the current time, can be in the triggering wait state, just, only uses low-power consumption stored record pattern to come image data, does not need to send data.
Under the situation of long-time data acquisition or monitoring, can also adopt FIFO mechanism, to guarantee the collection capacity of new valid data.
Step 204: the synchronizer of wireless sensor network system receives and triggers message.
The triggering message that described triggering message can send for the wireless sensor network node of described wireless sensor network system inside, also the triggering message that can send when externally network node begins image data simultaneously for the external network system.
By this step, can be by be triggered the synchronous acquisition that realizes wireless sensor network system and external network system by external network, also can realize the synchronous acquisition of inner each wireless sensor network node of wireless sensor network system by being triggered by the wireless sensor network node of wireless sensor network system inside.
Step 205: synchronizer obtains the current time, and the described current time is sent to described each wireless sensor network node together as triggered time and the triggering message that receives.
Step 206: wireless sensor network node receives triggering message and the triggered time from the synchronizer of described wireless sensor network system.
Step 207: wireless sensor network node is retained in the data of gathering after the described triggered time with the data deletion of gathering before the described triggered time, and the data of described reservation are transmitted as valid data or stores.
The above obtains the current time and can realize by following arbitrary mode:
Mode one: synchronizer obtains current satellite time by GPS, with described current satellite time as the current time;
Mode two: synchronizer obtains current fiducial time by the time reference circuit of building with crystal oscillator, with described current fiducial time as the current time;
Mode three: synchronizer obtains the current Ethernet time by Ethernet, with the described current Ethernet time as the current time.
The 3rd embodiment:
The structure chart of the wireless sensor network system that Fig. 3 provides for the embodiment of the invention, as shown in Figure 5:
The wireless sensor network system of the realization synchronous acquisition that the embodiment of the invention provides comprises: host computer 301, synchronizer 302 and wireless sensor network node 303.
Triggering message described here can be the triggering message that sends from the wireless sensor network node of described wireless sensor network system inside, also the triggering message that can send when externally network node begins image data simultaneously for the external network system.
Mode one: time module 3021 is GPS, obtains current satellite time by GPS, with described current satellite time as the current time.Certainly, can also carry out periodicity to the satellite time that obtains proofreaies and correct.
Mode two: time module 3021 time reference circuit for adopting crystal oscillator to build, crystal oscillator described here can be the active or passive crystal oscillator of high accuracy, in order to be provided fiducial time, with described fiducial time as the current time.
Mode three: time module 3021 is obtained the current Ethernet time for can obtain the equipment of Ethernet time by Ethernet, with the described current Ethernet time as the current time.For example, can use Ethernet Absolute Time Synchronization technology, obtain the Ethernet time, with the current Ethernet time as the current time, and the cycle proofread and correct.
Wireless sensor network node 303 is used to receive the acquisition of self-synchronous device 302 and trigger message, begin image data after receiving described acquisition, after receiving described triggering message, begin transmission or storage valid data, described valid data are the data that wireless sensor network node 303 is gathered after synchronizer 302 receives triggering message.
Wireless sensor network node 303 comprises: time discrimination module 3031 and data acquisition module 3032;
In actual applications, processing module 3022 can be made up of master controller, wireless sensor network communication module and communication interface with pc.The wireless sensor network communication module has the effect of wireless sensor network gateway, is used for the communication between processing module and the wireless sensor network node; Communication interface with pc is used for the communication between processing module and the host computer; Master controller is used to finish all processing operations of processing module.
Need to prove, also comprise the wireless sensor network communication module in the wireless sensor network node 303, be used for carrying out communication, and then realize the transmission of the information between wireless sensor network node 303 and the processing module 3022 with the wireless sensor network communication module of processing module 3022.
The wireless sensor network communication module can adopt the wireless protocols based on the IEEE802.15.4 standard to carry out transfer of data and networking.The wireless sensor network communication module can comprise the control of 802.15.4 physical layer protocol and data transmit-receive chip and 802.15.4MAC layer protocol analysis chip.
802.15.4 physical layer protocol control and data transmit-receive chip, on spread spectrum that can transceiver, encoding and decoding, orthogonal PSK (O-QPSK, Offset-Quadrature Phase Shift Keying) modulating/demodulating, base band signal process, the signal/down-conversion, the data radio frequency sends with the radio frequency reception etc.802.15.4MAC the layer protocol analysis chip can be used for the 802.15.4MAC layer protocol and resolve, for example: set up network topology structure and connect; Realize the packing of MAC layer data and separate packet function; The equipment in the network of realizing passes mutually by Coordinator, Router and End Device Point-to-Point Data; Prevent signal collision; Sensor node is realized time synchronized; Realize the seamless interfacing of data link between data conditioning device and base station equipment; And logarithm is executed the control etc. of maintaining secrecy factually.
802.15.4 physical layer protocol control can be adopted MC 13192 with the data transmit-receive chip, 802.15.4MAC layer protocol analysis chip adopts MC9S08GT60 to realize; Also 802.15.4 physical layer protocol control and data transmit-receive chip and 802.15.4 mac-layer protocol analysis chip can be carried out integratedly, realize as the 802.15.4 agreement integrated chip CC2430 of employing TI company.
The network topology structure of wireless sensor network communication module can adopt connected modes such as Star Network, point to point network, bunch shape tree or mesh network, consolidated network can hold 65000 wireless sensor network nodes, adopt the transmission means of multi-hop, thereby cover wide scope; Also can be according to the concrete needs of user, the network that customization is fit to connects.
In the practical application, can also on the sendaisle of wireless sensor network communication module and receive path, radio-frequency power amplifier and low noise amplifier be set, transmitting-receiving power is amplified, to increase the communication distance between wireless sensor network node.The transmit receive antenna of wireless sensor network communication module can adopt PCB antenna, also can adopt paster antenna or whip antenna.
When setting up wireless sensor network, master controller can send to each wireless sensor node by the current time that the wireless sensor network communication module obtains time module.Wireless sensor node will produce time service sum of errors intra-node clock because the time cumulative errors that factors such as crystal oscillator deviation cause, use existing Time synchronization technique, such as RBS, FTSP or DMTS scheduling algorithm, the perhaps Time synchronization technique of Beijing Beetech Technology Inc., just can eliminate above-mentioned time service sum of errors time cumulative errors, guarantee the time synchronized between synchronizer and the wireless sensor node.Here will repeat no more these Time synchronization technique.
Communication interface with pc can adopt existing computer interface to realize, for example USB, RS232 or Ethernet interface also can adopt the industrial bus interface to realize, such as MBUS or HART.
In order to improve industrial reliability and antijamming capability, can also can use photoelectric isolated chip at the I/O end of trigger module 3023.
Master controller can be single-chip microcomputer, embedded computer or DSP digital signal processing chip.
In addition, the above external network can be wired network system, also can be wireless sensor network system, certainly, also can be the wireless sensor network system that the embodiment of the invention provided.
In described external network system is under the situation of wired network system, because the real-time of wired network system, wired network system also can be when data acquisition begins, can send to wireless sensor network system immediately and trigger message, therefore, can realize the synchronous acquisition of wired network system and wireless sensor network system.
From technique scheme as can be seen, method, wireless sensor network system and the synchronizer of the realization synchronous acquisition that the embodiment of the invention provides, each wireless controller network node begins image data in advance, after receiving triggering message, begin transmission or storage valid data again, described valid data are the data that wireless sensor network node is gathered after synchronizer receives triggering message.Because it is unique that synchronizer receives the time of triggering message, therefore, can realize that each wireless controller network node is in the synchronization image data.
In addition, method, wireless sensor network system and the synchronizer of the realization synchronous acquisition that the embodiment of the invention provides, the absolute time of collection can also be provided for wireless sensor network node, as the gps satellite time, perhaps Ethernet time, and then guarantee each wireless sensor network node image data at one time; Need in wireless sensor network node, not increase extra hardware,, reduce the cost and the power consumption of node, reduce that the extra power supply energy of wireless sensor node expends and the memory resource waste such as the GPS module.
And, method, wireless sensor network system and the synchronizer of the realization synchronous acquisition that the embodiment of the invention provides, can trigger by the wireless sensor network node in the wireless sensor network system, realize the synchronous acquisition of wireless sensor network system inside; Can also trigger by external network, and then realized that each wireless sensor network node of wireless sensor network system and the node of other external network system carry out synchronous acquisition, if described external network system is a wired network system, then can realize the synchronous acquisition of wireless sensor network system and wired network system.
Because wireless sensor network node battery and internal storage resource-constrained, under the unpredictable situation of Time To Event, if adopt existing synchronous collection method, whole network can occur and additionally gather the problem that the waste of transmission or storage will become very big, even the risk that has some node and lost efficacy in effective acquisition and recording process because of resource exhaustion.And method, wireless sensor network system and the synchronizer of the realization synchronous acquisition that the employing embodiment of the invention provides by the mode of passive triggering, have solved above problem.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a method that realizes synchronous acquisition is characterized in that, this method comprises:
Each wireless sensor network node image data of wireless sensor network system;
The synchronizer of wireless sensor network system receives and triggers message, and described triggering message is sent to each wireless sensor network node;
Described each wireless sensor network node begins transmission or storage valid data, and described valid data are the data that wireless sensor network node is gathered after wireless sensor network system receives triggering message.
2. method according to claim 1 is characterized in that, the step of each node image data of described wireless sensor network system comprises:
The host computer of wireless sensor network system sends the synchronizer of acquisition to wireless sensor network system;
Described synchronizer with the acquisition that receives after, obtain the current time, and each wireless sensor network node that the acquisition that receives and current time are sent to wireless sensor network system;
Described each wireless sensor network node receives described acquisition and after the current time, begins image data.
3. method according to claim 1 is characterized in that, the synchronizer of described wireless sensor network system receives and triggers message, and the step that described triggering message is sent to each wireless sensor network node comprises:
The synchronizer of described wireless sensor network system receives described triggering message;
After described synchronizer receives described triggering message, obtain the current time, the described current time is sent to described each wireless sensor network node together as triggered time and the triggering message that receives.
4. method according to claim 3 is characterized in that, described each wireless sensor network node begins to transmit or the step of storing valid data comprises:
Each wireless sensor network node receives triggering message and the triggered time from the synchronizer of described wireless sensor network system;
Each wireless sensor network node receives described triggering message and after the triggered time, with the data deletion of gathering before the described triggered time, be retained in the data of gathering after the described triggered time, and the data of described reservation are transmitted as valid data or store.
5. according to the arbitrary described method of claim 2～4, it is characterized in that the described step of obtaining the current time comprises:
Synchronizer obtains current satellite time by GPS, with described current satellite time as the current time; Perhaps,
Synchronizer obtains current fiducial time by the time reference circuit of building with crystal oscillator, with described current fiducial time as the current time; Perhaps,
Synchronizer obtains the current Ethernet time by Ethernet, with the described current Ethernet time as the current time.
6. according to the arbitrary described method of claim 1～4, it is characterized in that, described triggering message is the triggering message that the wireless sensor network node of described wireless sensor network system inside sends, perhaps the triggering message that sends when externally network node begins image data simultaneously for the external network system.
7. a wireless sensor network system of realizing synchronous acquisition is characterized in that, this system comprises: host computer, synchronizer and wireless sensor network node;
Described host computer is used for sending acquisition to synchronizer;
Described synchronizer is used for the acquisition from host computer is sent to wireless sensor network node, receives to trigger message, and described triggering message is sent to each wireless sensor network node;
Described wireless sensor network node is used to receive the acquisition of self-synchronous device and trigger message, begin image data after receiving described acquisition, after receiving described triggering message, begin transmission or storage valid data, described valid data are the data that wireless sensor network node is gathered after synchronizer receives triggering message.
8. wireless sensor network system according to claim 7 is characterized in that, described synchronizer comprises: time module, processing module and trigger module;
Described time module is used to obtain the current time;
Described processing module is used to receive the acquisition from host computer, the current time that described acquisition and time module are obtained is sent to wireless sensor network node, receive triggering message by trigger module, and extract the current time that described time module is obtained, the described current time is sent to each wireless sensor network node together as triggered time and described triggering message;
The triggering message that described trigger module is used for receiving is sent to processing module.
9. wireless sensor network system according to claim 8 is characterized in that, described wireless sensor network node comprises: time discrimination module and data acquisition module;
Described time discrimination module is used to receive acquisition, triggering message and the triggered time of self-synchronous device, after receiving acquisition, the acquisition that receives is sent to data acquisition module, receive described triggering message and after the triggered time, with the data deletion of before the described triggered time, gathering in the data acquisition module, the data that storage or transmission data acquisition module were gathered after the described triggered time, the data of described reservation are valid data;
Described data acquisition module is used to receive the acquisition from the time discrimination module, receive described acquisition after, the beginning image data.
10. according to Claim 8 or 9 described wireless sensor network systems, it is characterized in that described time module is GPS, the perhaps time reference circuit for building with crystal oscillator is perhaps for can obtain the equipment of Ethernet time.
11. according to claim 7,8 or 9 described wireless sensor network systems, it is characterized in that, described triggering message is the triggering message from the wireless sensor network node transmission of described wireless sensor network system inside, perhaps the triggering message that sends when externally network node begins image data simultaneously for the external network system.
12. a synchronizer of realizing synchronous acquisition is characterized in that, this synchronizer comprises: time module, processing module and trigger module;
Described time module is used to obtain the current time;
Described processing module is used to receive the acquisition from host computer, the current time that described acquisition and time module are obtained is sent to wireless sensor network node, receive triggering message by trigger module, and extract the current time that described time module is obtained, the described current time is sent to each wireless sensor network node together as triggered time and described triggering message;
Described trigger module is used for receiving triggering message, and the triggering message that receives is sent to processing module.
13. synchronizer according to claim 12 is characterized in that, described time module is GPS, is the time reference circuit of building with crystal oscillator perhaps, perhaps for can obtain the equipment of Ethernet time.
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| CN106936530A (en) * | 2017-03-28 | 2017-07-07 | 浙江大学 | A kind of wireless sensing wind load monitoring system for realizing multi-measuring point synchronous acquisition |
| CN108872881A (en) * | 2018-06-26 | 2018-11-23 | 包莉丽 | Distributed generation resource electric energy quality monitoring method |
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| CN110366240B (en) * | 2019-08-30 | 2021-05-25 | 重庆大学 | High-precision synchronous triggering method for wireless sensor network |
| CN113129474A (en) * | 2020-01-16 | 2021-07-16 | 浙江吉利汽车研究院有限公司 | Method, device and equipment for using time information and storage medium |
| CN111511013A (en) * | 2020-03-27 | 2020-08-07 | 桃芯科技(苏州)有限公司 | Method, electronic device, and computer storage medium for synchronizing control signals |
| CN114466033A (en) * | 2022-02-16 | 2022-05-10 | 昆明嘉和智慧科技有限公司 | Distributed interconnection type data transmission method for wireless signal acquisition nodes |
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