CN106548658A - A kind of wireless anti-interference parking stall measure system of earth magnetism sensing - Google Patents
A kind of wireless anti-interference parking stall measure system of earth magnetism sensing Download PDFInfo
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- CN106548658A CN106548658A CN201611028679.0A CN201611028679A CN106548658A CN 106548658 A CN106548658 A CN 106548658A CN 201611028679 A CN201611028679 A CN 201611028679A CN 106548658 A CN106548658 A CN 106548658A
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- parking stall
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
Abstract
The present invention relates to technical field of intelligent traffic, discloses a kind of wireless anti-interference parking stall measure system of earth magnetism sensing.The invention includes being responsible for the type wireless geomagnetic sensor terminal node of parking stall measure, is responsible for the 433MHz wireless routing nodes of forwarding data and collects the network center of Monitoring Data；The type wireless geomagnetic sensor terminal node is arranged in below parking stall, is detected current parking space state using Geomagnetism Information, and is realized that multiple access is accessed using collision avoidance protocol；The routing node is responsible for collecting the data of type wireless geomagnetic sensor node and the network center being forwarded the data in the way of multihop routing；The network center collects all parking stall measure data and displays them to parking user, it is characterised in that：Whole system adopts 433MHz ad hoc deployed wireless networks.
Description
Technical field
The present invention relates to technical field of intelligent traffic, more specifically, more particularly to a kind of the wireless anti-of earth magnetism sensing is done
Disturb parking stall measure system.
Background technology
With expanding economy, the living standard of people also more and more higher, automobile are just gradually coming into common people house, each
The car owning amount of big-and-middle small city is all into the growing trend of explosion type.The vehicles facilitate the life of people, but vehicle
Increasingly increase, also many inconvenience is brought to life to a certain extent.The commercial building and business of the center lot in city
The rare parking facility of immediate vicinity is far from meeting actual demand.The public place of parking difficulty problem bottleneck is limited to a lot,
All it is difficult to improve current situation in a short time." parking difficulty " is the significant problem that China or even the whole world need solution.Therefore, such as
It is a current study hotspot that what rapidly and accurately searches out the parking stall of free time.
At present, parking position detection can be divided into following several ways：（1）By the parking stall measure of video, the detection
Method is by installing photographic head and then image again to being captured carries out the method for image procossing carrying out the detection of idle parking stall.
（2）By the parking stall measure of ultrasound wave, this method installs ultrasound probe in each parking stall, judges car using ultrasound wave
Whether position is idle.（3）Based on secondary development is carried out on the basis of Zig Bee wireless sensor networks, then addition sensor is carried out
The detection of parking stall.In three of the above method, first two is wiresounding method, needs to change existing parking lot on a large scale
Then construction wiring, cost are higher, are based especially on the method for detecting parking stalls of video.Method based on Zig Bee networks is then
It is a kind of wireless method, than wired method convenient and flexible installation, but Zig Bee work in 2.4GHz frequency ranges, this
Frequency range and WiFi, bluetooth etc. overlap, excessively crowded, are particularly susceptible to the interference of WiFi or interfere with WiFi user, and
And 2.4GHz, because wavelength is shorter, not enough, penetrance is not strong for diffracting power, in the middle of the so more complicated indoor environment in parking lot
Communication quality susceptible.
The content of the invention
It is an object of the invention to provide a kind of wireless anti-interference parking stall measure system of earth magnetism sensing, the parking stall measure system
System is using 433MHz ad hoc deployed wireless networks, anti-interference, and deployment is flexible, is quick on the draw, with very strong practical value.
A kind of wireless anti-interference parking stall measure system of earth magnetism sensing, including the type wireless geomagnetic sensor of responsible parking stall measure
Terminal node, the 433MHz wireless routing nodes for being responsible for forwarding data and the network center for collecting Monitoring Data.
Type wireless geomagnetic sensor terminal node is arranged in below parking stall, using the current parking space state of ground thorn infomation detection, and
Realize that multiple access is accessed using collision avoidance protocol；Routing node is responsible for collecting the data of type wireless geomagnetic sensor node and with multi-hop
The mode of route forwards the data to network center；Network center collects all parking stall measure data and displays them to stop
User.
Compared with prior art, a kind of wireless anti-interference parking stall measure system design of earth magnetism sensing of the invention is a kind of new
Wireless geomagnetism parking stall measure sensor node, the sensor node be based on 433MHz frequency ranges.433MHz than 2.4GHz wavelength compared with
Long, penetrance is higher, and, strong interference immunity misaligned with conventional frequency range is more suitable for more complicated indoor environment.The node is using ground
Magnetic Sensor detects parking space state, testing result is transmitted to router by 433MHz wireless radio frequency modules again then, is passed through
Detection data is sent to background server by router.Whole system adopts 433MHz ad hoc deployed wireless networks, anti-interference, deployment
Flexibly, it is quick on the draw, with very strong practical value.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is parking position detecting system Organization Chart of the present invention.
Fig. 2 is wireless geomagnetism parking stall measure node system block diagram of the present invention.
Fig. 3 is geomagnetic sensor hardware circuit of the present invention.
Fig. 4 is 433MHz wireless radio frequency circuits of the present invention.
Fig. 5 is sensor node main program flow chart of the present invention.
Fig. 6 is data wireless transmission flow chart of the present invention.
Fig. 7 is sensing node parking stall measure flow chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the preferred embodiments of the present invention are described in detail, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent clearly defines so as to make to protection scope of the present invention.
Refering to shown in Fig. 1, the present invention provides kind of a wireless anti-interference parking stall measure system for earth magnetism sensing, including responsible parking stall
The type wireless geomagnetic sensor terminal node of detection, the 433MHz wireless routings for being responsible for forwarding data and the net for collecting Monitoring Data
Network center.
Type wireless geomagnetic sensor terminal node is arranged in below parking stall, detects current parking space state using Geomagnetism Information, and
Realize that multiple access is accessed using collision avoidance protocol；Routing node is responsible for collecting the data of type wireless geomagnetic sensor node and with multi-hop
The mode of route forwards the data to network center；Network center collects all parking stall measure data and displays them to stop
User.
The hardware of type wireless geomagnetic sensor node includes：Geomagnetic sensor circuit, main controller circuit, 433MHz are wirelessly penetrated
Frequency circuit and electric power management circuit.Geomagnetic sensor circuit is responsible for gathering Geomagnetism Information, and main controller circuit is whole circuit
Core, is responsible for the process of earth magnetism sensing data, the Access Control program of radio communication and power management routines, and 433MHz is wirelessly penetrated
Frequency circuit realizes the radio-frequency receiving-transmitting of data on hardware, and electric power management circuit is then responsible for the power supply of whole circuit, bag
Include management of charging and discharging etc..System block diagram is as shown in Figure 2.
Three axle geomagnetic sensors of the geomagnetic sensor that type wireless geomagnetic sensor terminal node is adopted for Freescale companies
MAG3110.MAG3110 is a kind of small-sized low-power consumption, digital axle magnetometer, with broad dynamic range；MAG3110 magnetic
Power meter can measure two axle of present position magnetic field levels direction and vertical direction axle has the geomagnetic data of 3 axial directions altogether.MAG3110
By the I of standard2C string shape interfaces are connected with MCU, can measure the position magnetic field of up to 10Gs, and output data rate can
Up to 80Hz.MAG3110 geomagnetic sensor circuits are as shown in Figure 3.
433MHz wireless radio frequency circuits, using NORDIC companies of Norway product less than 1GHz radio frequency chip nRF905.Should
Chip operates mainly in 433,868,915MHz ISM band.With repeating transmission automatically, the work(such as automatic-answering back device and carrier wave detection
Can, nRF905 is communicated with master controller by SPI interface.433MHz wireless radio frequency circuits are as shown in Figure 4.
The main flow chart of sensor node software is as shown in figure 5, main flow is system initialization, including initializes main control
Device, geomagnetic sensor and radio-frequency module, then send web search instruction search router nearby, network to be successfully joined
Afterwards, gather geomagnetic data and judge parking space state, if parking space state is unchanged, directly dormancy；Such as change, then by number
According to routing node secondary dormancy is sent to, wake up after dormancy certain hour, restart to detect parking space state.
As sensitive zones might have multiple nodes, therefore, wireless transmission must adopt certain method for collision avoidance
To ensure the reliability of data transfer.The method for collision avoidance that the present invention is adopted is as shown in fig. 6, first carry out carrier wave when sending data
Intercept, data are sent if channel idle, if receiving automatic-answering back device, data is activation success terminates this transmission；Such as
Fruit does not receive automatic-answering back device, then random delay is sent after for a period of time again, if it exceeds maximum number of retransmissions, then judge to send
Failure, and terminate this transmission.
The flow process of geomagnetic parking stall detection method is as shown in Figure 7.Detection must use decision threshold, due to geomagnetic data be with
Shi Bianhua's, therefore, this thresholding is the meansigma methodss of nearest 10 earth magnetism gathered datas.In the middle of main flow initialization, sensing
Device node continuous acquisition is simultaneously provided with this thresholding.In parking stall measure flow process, program first judges the state of last time parking stall, and will
The data for collecting are contrasted with thresholding.If last time parking space state is empty and this secondary data is not above thresholding, prove
Current parking space state is also empty, and this secondary data as reference, is obtained new thresholding by threshold value after weighted average；If it does, and
Exceed for continuous 5 times, then judge that current parking stall is occupied；Conversely, when last time parking space state is busy, flow process is also such as such
Push away.
The present invention operation principle be：Type wireless geomagnetic sensor terminal node is arranged in below parking stall, pierces information using ground
Current parking space state is detected, and realizes that multiple access is accessed using collision avoidance protocol；Routing node is responsible for collecting wireless geomagnetism sensing
The data of device node simultaneously forward the data to network center in the way of multihop routing；Network center collects all parking stall measure numbers
According to and display them to parking user.
Although being described in conjunction with the accompanying embodiments of the present invention, patent owner can be in claims
Within the scope of make various modifications or modification, as long as less than the present invention claim described by protection domain, all should
Within protection scope of the present invention.
Claims (1)
1. a kind of wireless anti-interference parking stall measure system of earth magnetism sensing, including the type wireless geomagnetic sensor end of responsible parking stall measure
End node, the 433MHz wireless routing nodes for being responsible for forwarding data and the network center for collecting Monitoring Data；It is described wirelessly
Magnetic Sensor terminal node is arranged in below parking stall, is detected current parking space state using Geomagnetism Information, and is assisted using conflict avoidance
View realizes that multiple access is accessed；The routing node is responsible for collecting the data of type wireless geomagnetic sensor node and in the way of multihop routing
Forward the data to the network center；The network center collects all parking stall measure data and displays them to use of stopping
Family, it is characterised in that：Whole system adopts 433MHz ad hoc deployed wireless networks.
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| CN201611028679.0A CN106548658A (en) | 2016-11-22 | 2016-11-22 | A kind of wireless anti-interference parking stall measure system of earth magnetism sensing |
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| CN201611028679.0A CN106548658A (en) | 2016-11-22 | 2016-11-22 | A kind of wireless anti-interference parking stall measure system of earth magnetism sensing |
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| CN201611028679.0A Pending CN106548658A (en) | 2016-11-22 | 2016-11-22 | A kind of wireless anti-interference parking stall measure system of earth magnetism sensing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798905A (en) * | 2017-10-17 | 2018-03-13 | 深圳市捷顺科技实业股份有限公司 | A kind of method and device for detecting vehicle and whetheing there is |
| CN107978174A (en) * | 2017-12-26 | 2018-05-01 | 数源科技股份有限公司 | The parking lot state monitoring apparatus and monitoring method perceived based on Collaborative environment |
| CN109147384A (en) * | 2018-09-28 | 2019-01-04 | 上海理工大学 | A kind of parking site detecting system and method |
| DE102023203479A1 (en) | 2023-04-18 | 2024-02-29 | Zf Friedrichshafen Ag | System and method for finding a free parking space |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798905A (en) * | 2017-10-17 | 2018-03-13 | 深圳市捷顺科技实业股份有限公司 | A kind of method and device for detecting vehicle and whetheing there is |
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Application publication date: 20170329 |