CN102637370B - Stall detection system based on wireless sensor network - Google Patents
Stall detection system based on wireless sensor network Download PDFInfo
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- CN102637370B CN102637370B CN201210118884.1A CN201210118884A CN102637370B CN 102637370 B CN102637370 B CN 102637370B CN 201210118884 A CN201210118884 A CN 201210118884A CN 102637370 B CN102637370 B CN 102637370B
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 239000000523 sample Substances 0.000 claims description 77
- 238000005070 sampling Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005059 dormancy Effects 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007958 sleep Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
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Abstract
A stall detection system based on a wireless sensor network is used for detecting stall using states in a parking region. The stall detection system is characterized by comprising stall detection nodes which are distributed in the parking region, the number of the stall detection nodes corresponds to that of stalls, and the stall detection nodes can send stall state data to an upper computer when the stall state changes. For the stall detection system based on the wireless sensor network, the data are sent to the upper computer only when the stall states change, so that the stall detection nodes are in a standby state when the data are not sent, and energy resources can be saved by adopting the stall detection nodes in the standby state at intervals. The stall detection system based on the wireless sensor network can realize data transmission, so that maintenance of the system can be realized only by controlling a transmitted wireless network.
Description
Technical field
The present invention relates to parking place detecting system, particularly relate to the parking place detecting system based on wireless sensor network.
Background technology
Along with the fast development of China's economy, urban development advances by leaps and bounds people to townie yearning also more and more by force, so increasing people gathers to city gradually.Due to improving constantly of people's living standard, automobile consumption also becomes the focus of people's consumption, and car owning amount is also increasing per capita.Urban land limited area, soil is not enough per capita, and city planning relatively lags behind, stop lack unified management scheduling, parking information open not, stop intelligent not.
So can find out the country for this populous soil per capita wretched insufficiency of China from above problem, the problems such as urban traffic blocking, parking difficulty, driving difficulty become increasingly conspicuous.Existing parking place detecting system mostly adopts the mode of wired laying, brings the problems such as operation maintenance cost is higher, energy demand is high thus also limit it and apply.
Summary of the invention
Based on this, provide a kind of and safeguard simple, the energy-conservation parking place detecting system based on wireless sensor network.
A kind of parking place detecting system based on wireless sensor network, for unloading lot detection using state in parking area, comprise: be distributed in parking stall probe node in parking area and corresponding to parking stall quantity, send parking space state data when parking space state changes to host computer.
Wherein in an embodiment, described parking place detecting system also comprises to be located on the probe node of described parking stall, for the Node Controller of the conversion of the duty and holding state that control parking stall probe node.
Wherein in an embodiment, described Node Controller is strong magnetic machine, and described strong magnetic machine is attached at above the probe node of parking stall.
Wherein in an embodiment, described Node Controller exports the signal with maximal value and minimum value, enters holding state and duty to control described parking stall probe node respectively.
Wherein in an embodiment, described parking stall probe node adopts adaptively sampled mechanism, is specially:
Described parking stall probe node is when detecting magnetic signal change and exceeding threshold value, then the sampling period is set to the first sampling period T
2;
Described parking stall probe node is when detecting magnetic signal change and being not more than threshold value, then the sampling period is set to the second sampling period T
1, wherein T
1and T
2be the default sampling period, and T
1be several times as much as T
2.
Wherein in an embodiment, also comprise the routing node for network service and gateway node, described parking stall probe node sends parking space state data by described routing node and described gateway node to host computer; Described parking stall probe node is at least connected with plural routing node, described routing node and described gateway node point to point connect, and described gateway node adopts inundation to the downlink data transmission of described parking stall probe node.
Wherein in an embodiment, described parking stall probe node adopts and confirms that retransmission mechanism is transferred to data the multiple routing nodes within the scope of one jumping.
Wherein in an embodiment, when described routing node receives the parking space state data of described parking stall probe node transmission, by hop-by-hop affirmation mechanism, parking space state data are transferred to gateway node.
Wherein in an embodiment, described gateway node, routing node timing dormancy and wake up.
Wherein in an embodiment, it is characterized in that, described routing node is provided with the solar module of powering for router.
The above-mentioned parking place detecting system based on wireless sensor network, owing to only just sending data to host computer when parking space state changes, therefore when not sending data, parking stall probe node is in holding state, therefore, employing intermittently can be in the parking stall probe node of holding state, saves the energy.Parking place detecting system employing wireless sensor network based on wireless sensor network realizes data transmission, and therefore the wireless network of needs to transmission carries out the maintenance that control just can realize system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the parking place detecting system based on wireless sensor network;
Fig. 2 is the communication scheme of parking stall probe node and host computer.
Embodiment
As shown in Figure 1, be the structural representation of the parking place detecting system based on wireless sensor network.Parking place detecting system based on wireless sensor network is used for unloading lot detection using state in parking area, comprise: be distributed in parking stall probe node 20 in parking area and corresponding to parking stall quantity, send parking space state data when parking space state changes to host computer.
Parking stall probe node 20 dynamic transmission sampled data, parking stall probe node 20 has car or from when having car to become without car from becoming without car detecting parking space state, sends parking space state data to host computer.Parking stall probe node 20 is real-time Transmission detection data not, but detection data at processing locality, calculates the status information of a car or car free.Such as, when parking space state from become without car have car time, parking stall probe node then to host computer send now parking space state for there being car, host computer record down time, vehicle when this parking stall leaves, it is without car that parking stall probe node 20 sends now parking space state to host computer, host computer record time departure, according to down time and time departure, host computer can show the parking space state information in garage, accomplish to dynamically update, instead of parking stall probe node 20 is sampled and transmits always, host computer is in do not stop the state upgraded, thus the treatment capacity of host computer and parking stall probe node 20 can be made to reduce, economize energy.
The cycle of parking stall probe node 20 in dynamic transmission sampled data process is change, is specially, if threshold value is C
t, when parking stall probe node 20 detect magnetic signal change exceed threshold value C
ttime, then the sampling period is set to the first sampling period T
2.When parking stall probe node 20 detect magnetic signal change be not more than threshold value C
ttime, then the sampling period is set to the second sampling period T
1.Wherein T
1and T
2be the default sampling period, and T
1be greater than T
2.The sampling period of generalized case parking space probe node is T
1, T
1be longer time period, be usually set between 3 to 10 seconds.And exceed threshold value C when detecting magnetic signal change
ttime, then shorten sampling period T
1to T
2, T
2usually be set between 0.1 to 0.5 second, with T
2after the sampling period continues for some time, parking stall probe node 20 detects magnetic signal situation of change, if be no more than threshold value C
t, then setting the sampling period is T
1if exceed threshold value C
t, then setting the sampling period is T
2.
In the present embodiment, if sampled value S
i, according to following formulae discovery reference value B
i, wherein α is smoothing parameter, can be set to 0.05.
If threshold value is C
t, when | S
i-B
i| <=C
twhen, if the sampling period of parking stall probe node be set to T
1, T
1be longer time period, usually can be set between 3 to 10 seconds.Threshold value C is exceeded when detecting magnetic signal change
ttime, namely | S
i-B
i| > C
t, then the parking stall probe node shortening sampling period is set to T
2, T
2usually can be set between 0.1 to 0.5 second, with T
2after the sampling period continues for some time T, reexamine magnetic signal situation of change, if change does not exceed threshold value C
t, then setting the sampling period is T
1.
In the present embodiment, parking place detecting system also comprises to be located on parking stall probe node 20, for the Node Controller 10 of the conversion of the duty and holding state that control parking stall probe node 20.Node Controller 10 exports the signal with maximal value and minimum value, enters holding state and duty to control parking stall probe node 20 respectively.
Particularly, Node Controller 10 is strong magnetic machine, and strong magnetic machine is attached at above parking stall probe node 20.The value of the signal of strong magnetic machine detection is maximal value and minimum value when alternately occurring, controls the mutual conversion that parking stall probe node 20 performs holding state and duty.Generally, minimum value is 0, and maximal value is 4096, and when the value of strong magnetic machine detectable signal is 0 or 4096, and 0 and 4096 alternately repeat, then strong magnetic machine can control the mutual conversion of parking stall probe node 20 straight line holding state and duty.
As shown in Figure 2, be the communication scheme of parking stall probe node and host computer.Parking stall probe node 20 sends parking space state data by routing node 30 and gateway node 40 to host computer.Parking stall probe node 20 is at least connected with plural routing node 30, routing node 30 and gateway node 40 point to point connect, and gateway node 40 adopts inundation to the downlink data transmission of parking stall probe node 20.
When routing node 30 receives the parking space state data of parking stall probe node 20 transmission, by hop-by-hop affirmation mechanism, parking space state data are transferred to gateway node 40.
Parking stall probe node 20 adopts and confirms that retransmission mechanism is transferred to data the multiple routing nodes 30 within the scope of one jumping.Parking stall probe node 20 can communicate with the multiple routing nodes in neighbor scope, is strengthened the reliability of the transmitting uplink data of parking stall probe node 20 and gateway node 40 by the mechanism of this redundant transmission.Parking stall probe node 20 adopts and confirms that retransmission mechanism is transferred to data the multiple routing nodes 30 within the scope of one jumping, from routing table, usually select 1 ~ 3 routing node 30 that communication quality is best.Form tree network between routing node 30 and gateway node 40, the routing node of each packet passes to gateway node 40 data by hop-by-hop affirmation mechanism, if gateway node 40 receives the packet of repetition, neglects.
Gateway node 40 can adopt inundation to the downlink data transmission of parking stall probe node 20.Inundation route is adopted to carry out data transmission between gateway node 40 and routing node 30, all routing nodes 30 must be held instruction information in 60 seconds, parking stall probe node 20 have employed dormancy mechanism, can not the data that transmit of real-time reception routing node 30, parking stall probe node 20 is set to obtain command information with the cycle of 20 seconds to routing node 30.
The timing dormancy of PC control gateway node 40, routing node 30 and waking up.Therefore, parking stall probe node 20 and routing node 30 can use instruction control timing dormancy and wake up.Order format is: T
sleep, T
wakeup.Such as, the SLEEP instruction that gateway node 40 issues is (1min, 480min), when the parking stall probe node 20 in network and routing node 30 receive this instruction, will sleep after 1 minute, and wakes up after 480 minutes in sleep.Parking stall probe node 20 and routing node 30 needed to preserve variable and various configuration parameter value before sleep, such as threshold value, parking space state, employing cycle and sequence number etc., the value of these parameters is all preserved in the nonvolatile memory, and the value of these parameters needs to recover before parking stall probe node 20 and routing node 30 wake up.
Routing node 30 in above-mentioned all embodiments is provided with the solar module of powering for routing node.
In the present embodiment, parking stall probe node 20 is in holding state before being deployed to parking stall.
The above-mentioned parking place detecting system based on wireless sensor network, adopts strong magnetic machine to control the duty of parking stall probe node, and what can make parking stall probe node interval is in holding state, saves the energy.And parking stall probe node adopts adaptively sampled mechanism, the workload of parking stall probe node can be reduced equally, thus reach energy-conservation object.Parking place detecting system employing wireless sensor network based on wireless sensor network realizes data transmission, and therefore the wireless network of needs to transmission carries out the maintenance that control just can realize system.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. the parking place detecting system based on wireless sensor network, for unloading lot detection using state in parking area, it is characterized in that, comprise: be distributed in parking stall probe node in parking area and corresponding to parking stall quantity, send parking space state data when parking space state changes to host computer; Parking stall probe node dynamic transmission sampled data, parking stall probe node has car or from when having car to become without car from becoming without car detecting parking space state, parking space state data are sent to host computer, parking stall probe node is real-time Transmission detection data not, but detection data at processing locality, calculate the status information of a car or car free;
If sampled value S
i, according to following formulae discovery reference value B
i, wherein α is smoothing parameter,
If threshold value is C
t, when | S
i– B
i| <=C
twhen, if the sampling period of parking stall probe node be set to T
1; Threshold value C is exceeded when detecting magnetic signal change
ttime, namely | S
i– B
i| >C
t, then the parking stall probe node shortening sampling period is set to T
2;
The cycle of described parking stall probe node in dynamic transmission sampled data process be change, described parking stall probe node adopts adaptively sampled mechanism, is specially, when described parking stall probe node detect magnetic signal change exceed threshold value C
ttime, then the sampling period is set to the first sampling period T
2; When described parking stall probe node detect magnetic signal change be not more than threshold value C
ttime, then the sampling period is set to the second sampling period T
1, wherein T
1and T
2be the default sampling period, and T
1be greater than T
2.
2. the parking place detecting system based on wireless sensor network according to claim 1, it is characterized in that, described parking place detecting system also comprises to be located on the probe node of described parking stall, for the Node Controller of the conversion of the duty and holding state that control parking stall probe node.
3. the parking place detecting system based on wireless sensor network according to claim 2, is characterized in that, described Node Controller is strong magnetic machine, and described strong magnetic machine is attached at above the probe node of parking stall.
4. the parking place detecting system based on wireless sensor network according to claim 2, is characterized in that, described Node Controller exports the signal with maximal value and minimum value, enters holding state and duty to control described parking stall probe node respectively.
5. the parking place detecting system based on wireless sensor network according to claim 1, it is characterized in that, also comprise the routing node for network service and gateway node, described parking stall probe node sends parking space state data by described routing node and described gateway node to host computer; Described parking stall probe node is at least connected with plural routing node, described routing node and described gateway node point to point connect, and described gateway node adopts inundation to the downlink data transmission of described parking stall probe node.
6. the parking place detecting system based on wireless sensor network according to claim 5, is characterized in that, described parking stall probe node adopts and confirms that retransmission mechanism is transferred to data the multiple routing nodes within the scope of one jumping.
7. the parking place detecting system based on wireless sensor network according to claim 5, it is characterized in that, when described routing node receives the parking space state data of described parking stall probe node transmission, by hop-by-hop affirmation mechanism, parking space state data are transferred to gateway node.
8. the parking place detecting system based on wireless sensor network according to claim 5, is characterized in that, described gateway node, routing node timing dormancy and wake up.
9. the parking place detecting system based on wireless sensor network according to claim 5 to 8 any one, is characterized in that, described routing node is provided with the solar module of powering for routing node.
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| CN201210118884.1A CN102637370B (en) | 2012-04-20 | 2012-04-20 | Stall detection system based on wireless sensor network |
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| CN102637370B true CN102637370B (en) | 2015-06-03 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390352B (en) * | 2012-09-27 | 2016-04-06 | 深圳市捷顺科技实业股份有限公司 | A kind of geomagnetic parking stall detector and detection system |
| CN103036604B (en) * | 2012-12-21 | 2015-05-20 | 浙江大学城市学院 | Urban wayside parking space relay communication protocol implementation method based on internet of things |
| CN106922011B (en) * | 2015-12-25 | 2020-10-23 | 深圳长城开发科技股份有限公司 | Wireless centralized meter reading system and management method for controlling low-power-consumption communication |
| CN110753304A (en) * | 2018-07-23 | 2020-02-04 | 阿里巴巴集团控股有限公司 | Method and system for determining vacancy rate of business object |
| CN109131362B (en) * | 2018-09-14 | 2023-11-28 | 中铁第四勘察设计院集团有限公司 | Intelligent rail train warehouse-in and warehouse-out automatic auxiliary guiding system and method |
| CN109191893A (en) * | 2018-09-25 | 2019-01-11 | 北京京东金融科技控股有限公司 | Parking stall detecting devices and parking space management system |
| CN110060499A (en) * | 2019-03-22 | 2019-07-26 | 西安艾润物联网技术服务有限责任公司 | The car searching method of Mechanical parking system, apparatus and system |
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