CN105338613A - System and method for time setting synchronization of scattered nodes by use of wireless communication - Google Patents
System and method for time setting synchronization of scattered nodes by use of wireless communication Download PDFInfo
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- CN105338613A CN105338613A CN201510742301.6A CN201510742301A CN105338613A CN 105338613 A CN105338613 A CN 105338613A CN 201510742301 A CN201510742301 A CN 201510742301A CN 105338613 A CN105338613 A CN 105338613A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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Abstract
The invention discloses a method for time setting synchronization of scattered nodes by use of wireless communication. An application model comprises a plurality of slave nodes, a master node and a plurality of wireless modules, wherein the wireless modules are respectively connected with each node, and the slave nodes and the master node are connected through the wireless modules. The master node sends a time setting message in a broadcast mode in a high-priority interruption INT1; after slave node wireless modules receive the time setting message, the time setting message is immediately forwarded to the slave nodes; the wireless modules trigger the slave nodes after a slave node wireless module hardware trigger time delay, the slave nodes, after receiving hardware trigger signals, immediately starts a high-priority interruption INT2, local time is compensated and adjusted within the interruption, and thus each slave node runs at synchronization time. The method can realize time setting of each slave node at a low cost in a simple manner and also has the advantage of high time setting synchronization precision.
Description
Technical field
The present invention relates to the wireless monitor sensory fields such as electric power, industrial automation, medical treatment and geographical environment, be specifically related to a kind of short-distance wireless communication that adopts to method synchronous during dispersed nodes pair.
Background technology
In above-mentioned field; if the systematicness of need, comprehensive grasp monitored target state; often need the multi-dimensional state amount obtaining monitored target; require that all quantity of states gather under an absolute time simultaneously; as power system relay protection device needs the multiple phase current of synchronous acquisition; in order to record power accurately, need synchronous acquisition phase current and phase voltage.Along with being showing improvement or progress day by day of modern communication technology, data acquisition and data processing often not on one device, but are installed according to the dispersion of special occasion.This just needs data acquisition unit data processing equipment can be sent to carry out computing these data according to Absolute Time Synchronization image data.Once occur that data are asynchronous, all data will not have relevance, the validity of the tested measurement of judgement that just cannot be correct, and then make equipment cannot complete the function that should possess, concerning electric power system, serious meeting produces mistrip thus causes power-off condition in various degree, affects the safe operation of electrical network.
Applying a kind of when current pair is the system of precision in level second, this realize advantage be cost little, realize simple, but shortcoming to be precision too poor, can only be applied in the applied environment checked roughly; Another kind is the system of precision in nanosecond, and this advantage that realizes is that precision is very high, can be applied in during high accuracy controls environment, but shortcoming to be cost too high, pair time system complex, equipment many.And social life, more demands is the time synchronized realizing Microsecond grade with low cost in production.
In sum, when to realize each from accurate pair of node how simply, at low cost, current industry facing challenges is still.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of radio communication that adopts to method synchronous during dispersed nodes pair, utilizing this method can realize the precise synchronization from node installed each dispersion.
To achieve these goals, the technical solution used in the present invention is: a kind of radio communication that adopts is to system synchronous during dispersed nodes pair, it is characterized in that: comprise some for data acquisition and control on the spot from node, one for data processing and communication supervisory host node, wherein, eachly all be equipped with wireless module from node and host node, be respectively responsible for sending data to host node from node, host node is responsible for each from synchronous during node pair through wireless module.
Further, during described host node employing broadcast mode transmission pair, message is extremely each from node.
Further, described wireless module is independently embedded system module.
To achieve these goals, the technical solution used in the present invention is: a kind of radio communication that adopts is to method synchronous during dispersed nodes pair, described method to system synchronous during dispersed nodes pair based on above-mentioned a kind of radio communication that adopts, is characterized in that, specifically comprises the following steps:
1) host node enters high-priority interrupt INT1, in a broadcast manner message during transmission pair;
2) when to receive pair from the wireless module of node after message, through from node wireless module hardware Time delay T
drear triggering is from node;
3), after receiving self wireless module hardware trigger signal from node, a high-priority interrupt INT2 is opened immediately;
4) among high-priority interrupt INT2, complete local zone time from node to compensate, realize dispersion from synchronous during node pair.
Further, the host node in described step 1 sends and comprises the following steps Times stationery body:
1) host node enters INT1 in high-priority interrupt;
2) host node obtains system time;
3) message check value computing time when to compensate pair;
4) message transmitting time during compensation pair;
5) compensate host node pair time message residence time;
6) message check value during calculating pair;
7) during startup pair, message sends.
Further, compensating in time from message during node reception pair in described step 2-4 specifically comprises the following steps:
1) from message during node reception pair;
2) by from node wireless module give from node hardware trigger signal, to pair time message resolve;
3) pass through from node wireless module hardware Time delay T
d, message when confirming to have resolved pair from node, has got timestamp;
4) a high-priority interrupt INT2 is started, by T
dtimestamp when to compensate to pair in message;
5) by this timestamp assignment to system soft clock.
Further, from the system absolute time T of node
abcomputing formula is:
T
ab＝T
c+T
cw+T
tr+T
s+T
d+T
adj，
Described T
abfor absolute time, T
cfor host node obtains system time and to be sent to wireless module consuming time, T
cwfor host node pair time message residence time, T
trfor wireless transmission is consuming time, T
sfor message repeating during wireless module pair is consuming time, T
dfor from node wireless module hardware Time delay, T
adjfor consuming time from node time compensation adjustment process.
Further, described pair time message comprise ID, type of message, timestamp and check code.
The invention has the beneficial effects as follows: a kind of radio communication that adopts is to method synchronous during dispersed nodes pair, can realize in the chip arbitrarily with radio communication transmission-receiving function or module, can realize simply, at low cost to each from node pair time, and the advantage that when to have pair, synchronization accuracy is high.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Synchronous flow chart when Fig. 1 is the present invention couple;
Fig. 2 is application module schematic diagram of the present invention;
Synchronous method schematic diagram when Fig. 3 is the present invention couple;
Message flow chart when Fig. 4 is host node of the present invention transmission pair;
Fig. 5 is that the present invention compensates flow chart from message during node reception pair in time.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details:
With reference to attached Fig. 1 and 2, the present invention proposes a kind of radio communication that adopts to method synchronous during dispersed nodes pair, its application model comprises some from node, host node and some wireless modules, host node is telecommunication management and data processing equipment, respectively be responsible for data band markers to be sent to host node from node, meanwhile, host node is responsible for each from synchronous during node pair through wireless module; Describedly comprise from nodal function equipment and the wireless module that is connected with from nodal function equipment from node, described is supervisory control system from nodal function equipment, realizes data acquisition and controlling functions on the spot; The wireless module that described host node comprises master node functionality equipment and is connected with master node functionality equipment, described master node functionality equipment is supervisory control system, realizes data and calculates and communication function; Describedly to be connected by described wireless module from node with described host node.The short-distance wireless operating frequency related in application model is identical, host node to Times literary grace broadcast mode, namely host node pair time the message controls transfer time relevant to Transmission bit rate.
Host node in high-priority interrupt INT1, in a broadcast manner send pair time message; When to receive pair from node wireless module after message, be transmitted to immediately from node; Should pass through from node wireless module hardware Time delay T from the wireless module of node
drear triggering is from node; After receiving hardware trigger signal from node, open a high-priority interrupt INT2 immediately; Local zone time compensation adjustment is completed in this interruption; Since then, respectively will run with lock in time from node.Specifically comprise the following steps:
1) host node enters high-priority interrupt INT1, in a broadcast manner message during transmission pair;
2) when to receive pair from the wireless module of node after message, through from node wireless module hardware Time delay T
drear triggering is from node;
3), after receiving hardware trigger signal from node, a high-priority interrupt INT2 is opened immediately;
4) among high-priority interrupt INT2, complete local zone time from node to compensate, realize dispersion from synchronous during node pair.
INT1 interrupt priority level is higher, then be more not easy to be interrupted, pair time precision higher; In INT2 interrupts, during school, function is consuming time very little, therefore very little to systematic influence.
With reference to accompanying drawing 3, from the system absolute time computing formula of node be:
T
ab＝T
c+T
cw+T
tr+T
s+T
d+T
adj，
Wherein T
abfor absolute time, T
cfor host node obtains system time and to be sent to wireless module consuming time, T
cwfor host node pair time message residence time, T
trfor wireless transmission is consuming time, T
sfor message repeating during wireless module pair is consuming time, T
dfor from node wireless module hardware Time delay, T
adjfor consuming time from node time compensation adjustment process.
With reference to accompanying drawing 4, host node send pair time message be that the form broadcasted is sent by radio channel, therefore during host node pair, message only sends and can arrive for 1 time each from node, specifically comprises the following steps:
1) host node enters INT1 in high-priority interrupt;
2) host node obtains system time;
3) message check value computing time when to compensate pair;
4) message transmitting time during compensation pair;
5) compensate host node pair time message residence time;
6) message check value during calculating pair;
7) during startup pair, message sends.
Host node send pair time instruction frame format in table 1,
Table 1: pair time instruction frame format
With reference to accompanying drawing 5, packet parsing when to carry out pair from node wireless module with the pattern of high-priority interrupt.When to be confirmed to be pair after message, through from node wireless module hardware Time delay T
d, given from node hardware trigger signal by hardware circuit signal; Through T
dafter time delay, message when confirming to have resolved pair from node, has got timestamp; A high-priority interrupt service is started, by T in this break in service after receiving hardware trigger signal
dcompensate to the timestamp in message, then using the value of this timestamp as system soft clock.Specifically comprise the following steps:
1) from message during node reception pair;
2) by from node wireless module give from node hardware trigger signal, to pair time message resolve;
3) pass through from node wireless module hardware Time delay T
d, message when confirming to have resolved pair from node, has got timestamp;
4) a high-priority interrupt INT2 is started, by T
dtimestamp when to compensate to pair in message;
5) by this timestamp assignment to system soft clock.
Time bias transformational relation in table 2,
Table 2: time bias transformational relation table
When to be achieved pair by above pattern, the error of each node of process is fixed, can be surveyed, and realizes time calibration by these error compensations to initial value.This pattern only based on conventional embedded system, adopt common hardware system and device can realize 20us pair time precision.As shown in Table 2, the error that this pattern causes is the cumulative errors that cause of crystal oscillator mainly, also only corresponding for system crystal oscillator need be replaced with performance boost when more high-precision model can complete pair for more high-precision application.In actual items application, when this pair, pattern embodied has gone out good economy and accuracy.
More than that the better enforcement of invention is illustrated, but innovation and creation are not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (8)
1. one kind adopts radio communication to system synchronous during dispersed nodes pair, it is characterized in that: comprise some for data acquisition and control on the spot from node, one for data processing and communication supervisory host node, wherein, eachly all be equipped with wireless module from node and host node, respectively be responsible for sending data to host node from node, host node is responsible for each from synchronous during node pair through wireless module.
2. a kind of radio communication that adopts according to claim 1 is to system synchronous during dispersed nodes pair, it is characterized in that: during described host node employing broadcast mode transmission pair, message is to each from node.
3. a kind of radio communication that adopts according to claim 1 is to system synchronous during dispersed nodes pair, it is characterized in that: described wireless module is independently embedded system module.
4. adopt radio communication to a method synchronous during dispersed nodes pair, described method, based on the arbitrary described system of claim 1-3, is characterized in that, specifically comprises the following steps:
1) host node enters high-priority interrupt INT1, in a broadcast manner message during transmission pair;
2) when to receive pair from the wireless module of node after message, through from node wireless module hardware Time delay T
drear triggering is from node;
3), after receiving self wireless module hardware trigger signal from node, a high-priority interrupt INT2 is opened immediately;
4) among high-priority interrupt INT2, complete local zone time from node to compensate, realize dispersion from synchronous during node pair.
5. a kind of radio communication that adopts according to claim 4 is to method synchronous during dispersed nodes pair, it is characterized in that, the host node in described step 1 sends and comprises the following steps Times stationery body:
1) host node enters INT1 in high-priority interrupt;
2) host node obtains system time;
3) message check value computing time when to compensate pair;
4) message transmitting time during compensation pair;
5) compensate host node pair time message residence time;
6) message check value during calculating pair;
7) during startup pair, message sends.
6. a kind of radio communication that adopts according to claim 4 is to method synchronous during dispersed nodes pair, it is characterized in that, compensating in time from message during node reception pair in described step 2-4 specifically comprises the following steps:
1) from message during node reception pair;
2) by from node wireless module give from node hardware trigger signal, to pair time message resolve;
3) pass through from node wireless module hardware Time delay T
d, message when confirming to have resolved pair from node, has got timestamp;
4) a high-priority interrupt INT2 is started, by T
dtimestamp when to compensate to pair in message;
5) by this timestamp assignment to system soft clock.
7. a kind of radio communication that adopts according to claim 4 is to method synchronous during dispersed nodes pair, it is characterized in that, from the system absolute time computing formula of node is:
T
ab=T
c+T
cw+T
tr+T
s+T
d+T
adj，
Described T
abfor absolute time, T
cfor host node obtains system time and to be sent to wireless module consuming time, T
cwfor host node pair time message residence time, T
trfor wireless transmission is consuming time, T
sfor message repeating during wireless module pair is consuming time, T
dfor from node wireless module hardware Time delay, T
adjfor consuming time from node time compensation adjustment process.
8. a kind of radio communication that adopts according to claim 4 is to method synchronous during dispersed nodes pair, and it is characterized in that, when described pair, message comprises ID, type of message, timestamp and check code.
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| CN106408914A (en) * | 2016-10-18 | 2017-02-15 | 武汉市工程科学技术研究院 | Wireless time synchronizing system for exploration instrument and synchronization realizing method thereof |
| CN108011684A (en) * | 2017-11-23 | 2018-05-08 | 珠海许继电气有限公司 | A kind of distributing synchronization failure wave-recording method based on short-range communication |
| CN108445279A (en) * | 2018-02-12 | 2018-08-24 | 北京和信瑞通电力技术股份有限公司 | Based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector |
| CN110749765A (en) * | 2019-10-29 | 2020-02-04 | 徐州和纬信电科技有限公司 | Stray current collection device with synchronous collection function |
| CN111372307A (en) * | 2018-12-25 | 2020-07-03 | 江苏中桥信息技术有限公司 | Time synchronization data acquisition system based on wireless multi-hop network |
| CN111398737A (en) * | 2020-04-08 | 2020-07-10 | 北京和信瑞通电力技术股份有限公司 | Recording management method and system applied to recording type fault indicator |
| CN111698076A (en) * | 2020-06-03 | 2020-09-22 | 河北工业大学 | Accurate communication synchronization method and system based on time compensation |
| CN116471211A (en) * | 2023-06-19 | 2023-07-21 | 威胜信息技术股份有限公司 | Accurate time setting method for electric power Internet of things |
| CN117687347A (en) * | 2024-02-02 | 2024-03-12 | 三峡智控科技有限公司 | Synchronous wave recording method and device based on FPGA and communication network |
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| CN111398737B (en) * | 2020-04-08 | 2022-05-17 | 北京和信瑞通电力技术股份有限公司 | Recording management method and system applied to recording type fault indicator |
| CN111698076A (en) * | 2020-06-03 | 2020-09-22 | 河北工业大学 | Accurate communication synchronization method and system based on time compensation |
| CN111698076B (en) * | 2020-06-03 | 2023-05-30 | 河北工业大学 | Accurate communication synchronization method and system based on time compensation |
| CN116471211A (en) * | 2023-06-19 | 2023-07-21 | 威胜信息技术股份有限公司 | Accurate time setting method for electric power Internet of things |
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| CN117687347A (en) * | 2024-02-02 | 2024-03-12 | 三峡智控科技有限公司 | Synchronous wave recording method and device based on FPGA and communication network |
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