CN104159326B - A kind of method of wireless vehicle detection sensing node and its detection vehicle - Google Patents
A kind of method of wireless vehicle detection sensing node and its detection vehicle Download PDFInfo
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Abstract
The invention discloses a kind of wireless vehicle detection sensing node and its method for detection vehicle, wireless vehicle detection sensing node includes geomagnetic sensor MMC3282, controller MSP430F1611 and 433MHz radio receiving transmitting module CC1101, the controller MSP430F1611 is connected by SPI interface with 433M radio receiving transmitting modules CC1101, and the geomagnetic sensor MMC3282 is connected by I2C interfaces with controller MSP430F1611.The present invention enables to monitoring personnel intuitively to observe very much the change of vehicle, local zone time is can be combined with to check that this changes, whole transmission is used and is wirelessly transferred, transmission is not influenceed by landform, deployment is simple, transmission speed is very fast, efficiency high, upper computer software can dynamic display data in real time, after vehicle is moved, can timely notify monitoring personnel, processed in time for staff, software can be saved into substantial amounts of data in database simultaneously, can generate chart, be used for information such as staff's analysis vehicle flows.
Description
Technical field
The present invention relates to vehicle monitoring field, and in particular to a kind of wireless vehicle detects sensing node and its detects vehicle
Method.
Background technology
With the fast development of China's economy, the continuous quickening of urbanization process, incident is the automobile on highway
It is more and more.Also make dredging for automobile increasingly severe with parking management problem.Making the perfect and raising of vehicle detecting system turns into
One important problem.
The current system that vehicle is monitored by geomagnetism method, mostly using magnetoresistive transducer (AMR), the 2 of these early stages
The geomagnetic sensor of axle or 3 axles, precision is not mostly high, and what is typically exported is all analog signal, in addition it is also necessary to build corresponding filtering
Amplifying circuit ability normal work, the collection of signal also needs analog to digital conversion circuit, its internal IC without numeral, operability
Difference.
The radio sensing network of these systems, almost all employs Zigbee protocol, Zigbee protocol it is really wireless
A kind of important networking mode of Sensor Network, it is now also highly developed, but under the application scenarios of the vehicle detection, but have it is many not
Applicable place, Zigbee protocol is very high for the requirement of hardware, and great pressure is brought to hardware cost, and what is most wanted is a bit
The topological structure of Zigbee, the equipment that it needs some long-term power supplies, (Router, Coordinator), this implementation to engineering
Bring great trouble.
The content of the invention
It is an object of the invention to provide a kind of wireless vehicle detection sensing node and its method for detecting vehicle, solve existing
With the presence of vehicle detection sitework implement, network easily disposes complicated difficulty, the scope of application and the very limited amount of problem of scene.
To solve above-mentioned technical problem, the present invention uses following technical scheme：
A kind of wireless vehicle detects sensing node, including geomagnetic sensor MMC3282, controller MSP430F1611 and
433MHz radio receiving transmitting modules CC1101, the controller MSP430F1611 pass through SPI interface and 433M radio receiving transmitting modules
CC1101 is connected, and the geomagnetic sensor MMC3282 is connected by I2C interfaces with controller MSP430F1611.
Further technical scheme is that the controller MSP430F1611 passes through SPI interface and 433M wireless receiving and dispatching moulds
Block CC1101 is connected, and (controller MSP430F1611 P5.3 pins connection 433M is wireless by specifically SPI clock line SCLK_RF
The SCLK pins of transceiver module CC1101), SPI master is to from data wire SI_RF, (the P5.1 pins of controller MSP430F1611 connect
Connect 433M radio receiving transmitting modules CC1101 SI pins), SPI to main data line SO_RF (controller MSP430F1611's
The SO pins of P5.2 pins connection 433M radio receiving transmitting modules CC1101), SPI chip selection signal line CSN_RF (controllers
The CSN pins of the P5.0 pins connection 433M radio receiving transmitting modules CC1101 of MSP430F1611), wireless data packet finishes receiving
Interrupt line GDO0 (controller MSP430F1611 P1.1 pins connection 433M radio receiving transmitting modules CC1101 GDO0 pins),
Radio frequency chip ready interrupt line GDO2 (the P1.4 pins connection 433M radio receiving transmitting modules CC1101 of controller MSP430F1611
GDO2 pins), power supply VCC and ground GND connection.
Further technical scheme is that the geomagnetic sensor MMC3282 passes through I2C interfaces and controller
MSP430F1611 be connected specifically I2C clock lines MAG_SCL (controller MSP430F1611 P1.2 pins connection 433M without
The SCL pins of line transceiver module CC1101), I2C data wires MSG_SDA (controller MSP430F1611 P1.3 pins connection
The SDA pins of 433M radio receiving transmitting modules CC1101), power supply VCC and ground GND connection.
The method that a kind of wireless vehicle detection sensing node described in claim 1 detects vehicle, comprises the following steps：
Step one, controller MSP430F1611 periodically controls geomagnetic sensor MMC3282 to gather Geomagnetic signal number
According to data include each 14 data bit of the axle Geomagnetic signal of X, Y, Z tri-；Data acquisition is to pass through I2C interfaces to earth magnetism from controller
Sensor sends acquisition, and geomagnetic sensor starts collection after taking orders, by I2C interfaces to control after data ready
Device returns to collection result；
Step 2, the geomagnetism detecting data that controller MSP430F1611 receives geomagnetic sensor MMC3282 outflows are laggard
Row data packaging operation sends so as to follow-up wireless data, and the final purpose address of geomagnetism detecting data Wireless transceiver is and prison
The connected aggregation node of control computer, if detection node is distant from aggregation node, it is impossible to direct wireless telecommunications, it is just necessary
Forwarded by other nodes, i.e. next-hop (hop) destination node, need to repeatedly forward when distant and get to convergence
Node, the corresponding data section in the geomagnetism detecting data of three axles are added packet by controller MSP430F1611, forms application
Layer data, is subsequently adding Internet (NWK) header and MAC layer (MAC) header, while according to wireless sensor network
The routing table that network Routing Protocol is safeguarded inserts node itself ground come next-hop (hop) destination node for selecting to send in NWK headers
Location, inserts next-hop (hop) destination node in MAC layer header, constitutes a complete message, controller MSP430F1611
Control 433MHz radio receiving transmitting modules CC1101 that the packet is transmitted wirelessly away by SPI interface after completion group package operation；
Step 3, controller MSP430F1611 is periodically turned on 433MHz radio receiving transmitting modules CC1101 and checks for
The wireless data packet of oneself is issued, if this node is not aggregation node, also needs to find the ground of next-hop node according to routing table
Destination address in location and updated data package in MAC header, next-hop node again is transmitted to by original message；
Step 4, serial ports, USB port or net are passed through as the wireless sensing node of aggregation node by the complete message of reception
Oral instructions are stored in database in transporting to monitoring computer, and judge whether vehicle by geomagnetism detecting node according to historical data
The geomagnetic data change of Shi Yinqi, and then judge presence or the motion state of vehicle, and most data display is on computers at last.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention enables to monitoring personnel intuitively to see very much
The change of vehicle is observed, can be combined with local zone time to check that this changes, using being wirelessly transferred, transmission is not received for whole transmission
The influence of landform, deployment is simple, and transmission speed is very fast, efficiency high, upper computer software can dynamic display data in real time, work as car
After movement, monitoring personnel can be timely notified, be processed in time for staff, while software can protect substantial amounts of data
It is stored in database, chart can be generated, is used for information such as staff's analysis vehicle flows.
Brief description of the drawings
Fig. 1 is the knot of controller MSP430F1611 in a kind of wireless vehicle detection sensing node one embodiment of the invention
Structure schematic diagram.
Fig. 2 is 433MHz radio receiving transmitting modules in a kind of wireless vehicle detection sensing node one embodiment of the invention
The structural representation of CC1101.
Fig. 3 is the knot of geomagnetic sensor MMC3282 in a kind of wireless vehicle detection sensing node one embodiment of the invention
Structure schematic diagram.
Fig. 4 is a kind of network system of method one embodiment of wireless vehicle detection sensing node detection vehicle of the invention
Figure.
Fig. 5 is a kind of flow signal of method one embodiment of wireless vehicle detection sensing node detection vehicle of the invention
Figure.
Fig. 6 is MAC medium access flows.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
To overcome these drawbacks, external scientific research institution, manufacturer proposes new solution, be first be proposed it is new
Sensor be geomagnetic sensor MMC3282, the precision of this sensor is higher, and integrated level is higher, is integrated with signal
Reason and modulus circuit and IC, output is data signal, and the area of chip is smaller, simplifies the design of monitoring node, reduces
The area of node.And be directed to wireless sense network, Berkeley released one after another based on embedded wireless net design exploitation
Platform Tioy OS, Open WSN, are easy to developer's self-developing to adapt to the agreement of various scenes, and various tools have been developed at present
There are low-power consumption, the radio sensing network of multi-hop.
Fig. 1-Fig. 4 shows that a kind of wireless vehicle of the invention detects one embodiment of sensing node：A kind of wireless vehicle
Detection sensing node, including geomagnetic sensor MMC3282, controller MSP430F1611 and 433MHz radio receiving transmitting module
CC1101, the controller MSP430F1611 is connected by SPI interface with 433M radio receiving transmitting modules CC1101, describedly
Magnetic Sensor MMC3282 is connected by I2C interfaces with controller MSP430F1611.
A preferred embodiment of sensing node is detected according to a kind of wireless vehicle of the invention,
The controller MSP430F1611 is connected specifically by SPI interface with 433M radio receiving transmitting modules CC1101
SPI clock line SCLK_RF (the SCLK of the P5.3 pins connection 433M radio receiving transmitting modules CC1101 of controller MSP430F1611
Pin), SPI master is to from data wire SI_RF, (the P5.1 pins of controller MSP430F1611 connect 433M radio receiving transmitting modules
The SI pins of CC1101), SPI to main data line SO_RF (controller MSP430F1611 P5.2 pins connection 433M it is wireless
The SO pins of transceiver module CC1101), SPI chip selection signal lines CSN_RF (controller MSP430F1611 P5.0 pins connection
The CSN pins of 433M radio receiving transmitting modules CC1101), wireless data packet finish receiving interrupt line GDO0 (controllers
MSP430F1611 P1.1 pins connection 433M radio receiving transmitting modules CC1101 GDO0 pins), radio frequency chip ready interrupt line
GDO2 (the GDO2 pins of the P1.4 pins connection 433M radio receiving transmitting modules CC1101 of controller MSP430F1611), power supply VCC
With the connection of ground GND.
Another preferred embodiment of sensing node, the geomagnetic sensor are detected according to a kind of wireless vehicle of the invention
MMC3282 is connected specifically I2C clock lines MAG_SCL (controllers by I2C interfaces with controller MSP430F1611
The SCL pins of the P1.2 pins connection 433M radio receiving transmitting modules CC1101 of MSP430F1611), I2C data wires MSG_SDA (controls
The SDA pins of the P1.3 pins connection 433M radio receiving transmitting modules CC1101 of device MSP430F1611 processed), power supply VCC and ground GND
Connection.
Fig. 5 shows the method that the wireless vehicle detection sensing node described in a kind of claim 1 of the invention detects vehicle
One embodiment：The method that a kind of wireless vehicle detection sensing node described in claim 1 detects vehicle, including following step
Suddenly：
Step one, controller MSP430F1611 periodically controls geomagnetic sensor MMC3282 to gather Geomagnetic signal number
According to data include each 14 data bit of the axle Geomagnetic signal of X, Y, Z tri-；Data acquisition is to pass through I2C interfaces to earth magnetism from controller
Sensor sends acquisition, and geomagnetic sensor starts collection after taking orders, by I2C interfaces to control after data ready
Device returns to collection result；
Step 2, it is laggard that controller MSP430F1611 receives the geomagnetism detecting data that geomagnetic sensor MMC3282 spreads out of
Row data packaging operation sends so as to follow-up wireless data, and the final purpose address of geomagnetism detecting data Wireless transceiver is and prison
The connected aggregation node of computer is controlled, if detection node is distant from aggregation node, it is impossible to direct wireless telecommunications, it is just necessary
Forwarded by other nodes, i.e. next-hop (hop) destination node, need to repeatedly be forwarded when distant and get to converge
Node, the corresponding data section in the geomagnetism detecting data of three axles are added packet by controller MSP430F1611, forms application
Layer data, is subsequently adding Internet (NWK) header and MAC layer (MAC) header, while according to wireless sensor network
The routing table that network Routing Protocol is safeguarded inserts node itself ground come next-hop (hop) destination node for selecting to send in NWK headers
Location, inserts next-hop (hop) destination node in MAC layer header, constitutes a complete message, controller MSP430F1611
Control 433MHz radio receiving transmitting modules CC1101 that the packet is transmitted wirelessly away by SPI interface after completion group package operation；
Step 3, controller MSP430F1611 is periodically turned on 433MHz radio receiving transmitting modules CC1101 and checks for
The wireless data packet of oneself is issued, if this node is not aggregation node, also needs to find the ground of next-hop node according to routing table
Destination address in location and updated data package in MAC header, next-hop node again is transmitted to by original message；
Step 4, the complete message that will be received as the wireless sensing node of aggregation node passes through serial ports, USB port or net
Oral instructions are stored in database in transporting to monitoring computer, and judge whether vehicle by geomagnetism detecting node according to historical data
The geomagnetic data change of Shi Yinqi, and then judge presence or the motion state of vehicle, and most data display is on computers at last
Mac-layer protocol
As shown in fig. 6, on the mac layer, node mainly carries out the transmission of data by two strategies, and one is CCA
(Clear Channel Assessment) channel estimating, i.e., first check channel, if be in before transmitting data
Busy condition, another is random number avoidance mechanism, i.e., when channel is busy, produce a random number time, wait after the duration
Attempt sending.
Routing Protocol
Broadcast the tree generation algorithm of spanning tree：
1. node jumps periodic broadcasting HELLO messages, sending node information, detecting link state in atmosphere one.
2. node jumps scope topological structure table by receiving the HELLO messages that other nodes send, generation one.
3. add the node cycle of network to send and receive the HELLO messages sent by other nodes, generation and
Update the Link Table tables of oneself.
4. its node rank of node definition and set membership for broadcasting spanning tree are added for new, update STTT (Spanning
Tree Topology Table) table.
5. STTT gauge seals are sent to neighbor node in STC (Spanning Tree Control) message.
6. each node updates oneself RT table according to STTT tables.
7. so repeatedly, until all nodes add spanning tree.So far, broadcast spanning tree is formed.
Broadcast the maintenance algorithm of spanning tree
1. after node is successfully joined broadcast spanning tree, by STC agreements, periodically father node and son to oneself
Node sends the STC messages of specific format, to state the presence of oneself.
2. after each node receives the statement message of father node and child node, associated timer is updated.
If 3. certain time does not receive STC messages, illustrating oneself disconnecting with this neighbor node.
If 4. the timer expiry of child node, will pass through node updates agreement by below this child node and this node
Desc nodes are deleted from network.
If 5. the timer expiry of father node, illustrates that the node and its child node and Desc nodes take off from network
From these nodes will add agreement to rejoin spanning tree by node.
6. the node of spanning tree is broadcasted for adding again, when its position in the tree there occurs change, will be by section
Point updates the node that the new positional information of this node is advertised to agreement correlation.
Node discovery procedure：Node in a network can constantly send HELLO messages, inform the neighbours in the range of a jump
The presence of node oneself.The HELLO messages sent by other hop neighbor nodes are received simultaneously, grasp a hop link information,
So as to generate a hop link information table.When the upper node of tree finds to have new node to add in the range of a jump, by JOIN_
Spanning-tree information is issued newly added node by MESSAGE messages.Newly added node once receives JOIN_MESSAGE messages, learns
Oneself has been added to spanning tree, is immediately generated STC messages, and broadcasted in spanning tree.The STC messages that newly added node sends
Show that the node has been added to spanning tree.
Tree topology maintenance process：After the node in spanning tree calculates MPR values generates new tree construction, by sending
JOIN_MESSAGE messages tell this information the node being added into, and periodically transmission STC messages safeguard tree topology knot
Structure.After the new node for adding receives the JOIN_MESSAGE messages sent by the upper node of tree, it is known that oneself have been added to generation
Tree, can generate the STC messages of oneself, be sent with the forms of broadcasting in the tree.
Tree topology renewal process：Node updates agreement is for exchanging the letter about spanning-tree topology structure change between node
Breath, that is, exchange generation tree topology table.The renewal of generation tree construction can be triggered by following condition：
1. new node adds network.
2. node itself leaves network.
3. downstream site leaves network.
4. node rejoins network.
Broadcast spanning tree Routing Protocol interior joint can constantly send the STC messages for updating to neighbor node, while also can
Constantly receive the STC messages transmitted by neighbor node.Whenever node receives the message all with newest one in same period
STC messages, i.e. last STC message for reaching update the STT table of oneself as standard, to ensure the newest of route.
The frame structure that the present invention is used
Link information table (Link Table)
| Neighbor IP | Level | Link Message Size |
Neighbor IP：This field description is with this node in a network channel for jumping the node of energy direct communication in atmosphere
The IP address of interface.
Level：Rank of the neighbor node in spanning tree.If the node is not in spanning tree, it is " NULL ".
Link Message Size：Link control message sizes, identical element byte.
Spanning-tree topology structural table (Spanning Tree Topology Table)
| IP hash | Level | State | IP | Parent IP |
IP hash：Using the IP of node as the index of Hash key assignments.In system addressing, because all nodes are all located at together
One C class IP network, so hash algorithm is last eight hyte for taking IP address.
Level：Rank of the node in spanning tree.
State：The state of this node.
Have 3 kinds of optional states：
Active：Starting state, shows that this node has been successfully joined network.
Neighbor node is shown to be successfully joined neighbours.
Candidate：Candidate state, shows that this node adds network.
It is invalid to neighbor node.
NA：State position is invalid, for other intermediatenesses.
IP：The IP address of the network channel interface of this node and its all downstream sites.
Parent IP：The IP address of the network channel interface of this node and the corresponding father node of each of which downstream site.
Routing directory (Routing Table)
| Source IP | Destination IP | Link State | Next Hop |
Source IP：The IP address of the network channel interface of source node.
Destination IP：The IP address of the network channel interface of destination node.
Link State：The state of this route entry is described.Possible state has following several：
ACTIVE：This route is available.
INACTIVE：This route once can use, and fail.
TEMP：This route is interim route, and the process of network is added for node.
Next Hop：The next-hop node of the node
HELLO message formats
Type：Type of message, is herein " 1 ", is expressed as HELLO messages.
Version：Protocol version, be herein " 1 ".
Time To Live：It is arranged to 1, represents HELLO control messages only in spot broadcasting, it is impossible to be forwarded.
Level1：Rank of the neighbor node in spanning tree.If the node is not in spanning tree, it is " NULL ".
Sender IP：Send the interface IP address of the network channel of the node of this message.
STC message formats
Type：Type of message, is herein " 3 ", is expressed as STC messages.
Level：Send the rank of the node of this STC message.
Version：Protocol version, be herein " 3 ".
Code：Reserved field.
STTT：Spanning-tree topology structural table, records the tree topology of broadcast tree where the node.
Sender IP：Send the interface IP address of the network channel of the node of this message.
JOIN_MESSAGE
Type：Type of message, is herein " 2 ", is expressed as JOIN_MESSAGE messages.
Level：Send the rank of the node of this JOIN_MESSAGE.
Version：Protocol version, be herein " 2 ".
Code：Reserved field.
STTT：Spanning-tree topology structural table, records the tree topology of broadcast tree where the node.
Sender IP：Send the interface IP address of the network channel of the node of this message.
Destination IP：The interface IP address of the network channel of destination node.
Advantages of the present invention is as follows：
(1) can choose whether for sensor to be embedded in underground when geomagnetic sensor is installed, it is not necessary to as inductance coil one
Sample will be embedded in underground and can just work, and can select to be installed in selected detection site suspension bracket or side, and road pavement destruction is small,
Geomagnetic sensor need to be only repaired when sensor goes wrong, it is not necessary to which blocked road digs face of turning up the soil and monitoring point is not subject to
Destruction, not by road surface moving influence.
(2) according to the characteristic of geomagnetic sensor, change is just produced only when ferromagnetic object passes through, for non-ferromagnetic thing
The process of body does not have any reaction, therefore can effectively reduce flase drop, compared to video detection, infrared detection or ultrasonic wave
Detection etc. is less susceptible to the influence of external environment.
(3) threshold value of the change of the magnetic field intensity detected to sensor is configured, and magnetic disturbance source can be carried out more
Accurate hoof choosing, can exclude the interference that non power driven vehicle causes, and after sensitivity is provided with, can identify difference
The ferromagnetic object of size is so as to judge the type of vehicle.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementation methods, and these modifications and implementation method will fall in this Shen
Please be within disclosed spirit and spirit.More specifically, in the range of disclosure, drawings and claims, can
Various variations and modifications are carried out with the building block to theme composite configuration and/or layout.Except to building block and/or layout
The deformation and improvement for carrying out are outer, and to those skilled in the art, other purposes also will be apparent.
Claims (1)
1. a kind of method that wireless vehicle detection sensing node detects vehicle, it is characterised in that：Sensing node is sensed including earth magnetism
Device MMC3282, controller MSP430F1611 and 433MHz radio receiving transmitting module CC1101, the controller MSP430F1611 are logical
SPI interface is crossed with 433MHz radio receiving transmitting modules CC1101 to be connected, the geomagnetic sensor MMC3282 by I2C interfaces and
Controller MSP430F1611 is connected；
Detection method is comprised the following steps：
Step one, controller MSP430F1611 periodically controls geomagnetic sensor MMC3282 to gather Geomagnetic signal data, number
According to including each 14 data bit of the axle Geomagnetic signal of X, Y, Z tri-；Data acquisition is to pass through I2C interfaces to geomagnetic sensor from controller
Acquisition is sent, geomagnetic sensor is started collection, returned to controller by I2C interfaces after data ready after taking orders
Collection result；
Step 2, controller MSP430F1611 receives the laggard line number of geomagnetism detecting data of geomagnetic sensor MMC3282 outflows
According to packaging operation so that follow-up wireless data sends, the final purpose address of geomagnetism detecting data Wireless transceiver is counted with monitoring
The connected aggregation node of calculation machine, if detection node is distant from aggregation node, it is impossible to direct wireless telecommunications, just must be by
Other nodes are forwarded, i.e. next-hop destination node, need to repeatedly be forwarded when distant and be got to aggregation node, work as control
The geomagnetism detecting data of three axles are added device MSP430F1611 processed corresponding data section in packet, form application layer data, so
Network layer header and MAC layer header are added afterwards, while the route safeguarded according to Wireless Sensor Network Routing Protocol
Table inserts node Self address come the next-hop destination node for selecting to send in NWK headers, is inserted in MAC layer header next
Destination node is jumped, a complete message is constituted, by SPI interface control after controller MSP430F1611 completion group package operations
433MHz radio receiving transmitting modules CC1101 transmits wirelessly away the packet；
Step 3, controller MSP430F1611 is periodically turned on 433MHz radio receiving transmitting modules CC1101 and checks for issuing
The wireless data packet of oneself, if this node is not aggregation node, also needs the address for finding next-hop node according to routing table simultaneously
Destination address in updated data package in MAC header, next-hop node again is transmitted to by original message；
Step 4, is transported to the complete message of reception by USB serial ports or network interface as the wireless sensing node of aggregation node
Database is stored in monitoring computer, and cause when judging whether vehicle by geomagnetism detecting node according to historical data
Geomagnetic data changes, and then judges presence or the motion state of vehicle, and most data display is on computers at last.
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| CN106102120B (en) * | 2016-06-06 | 2019-08-09 | 武汉宏佳启元科技有限公司 | It is a kind of to organize WLAN and data receiving-transmitting method from oneself of master agreement and network-building method |
| CN106023643A (en) * | 2016-07-05 | 2016-10-12 | 湖北第二师范学院 | Internet of things-based novel vehicle detection device |
| CN106373407A (en) * | 2016-11-22 | 2017-02-01 | 广西大学 | Vehicle detector based on geomagnetic sensing |
| CN108917678A (en) * | 2017-08-03 | 2018-11-30 | 余敏鸿 | Radio transmission transducing device and its detection method for detection object state change |
| CN112235747B (en) * | 2020-09-11 | 2024-04-26 | 智慧式有限公司 | Wireless communication method and system for vehicle detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101159689A (en) * | 2007-11-08 | 2008-04-09 | 北京科技大学 | Mobile sensor network routing method based on region gradient updating |
| CN101453693A (en) * | 2008-12-10 | 2009-06-10 | 扬州万方电子技术有限责任公司 | Multi-element information fusion and wireless transmission system based on GIS platform |
| US20110317017A1 (en) * | 2009-08-20 | 2011-12-29 | Olympus Corporation | Predictive duty cycle adaptation scheme for event-driven wireless sensor networks |
| CN202183167U (en) * | 2011-05-09 | 2012-04-04 | 浙江创泰科技有限公司 | Intelligent parking detection device based on Mesh wireless sensing network |
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