CN103123743A - Vehicle counting system and method based on wireless sensor network - Google Patents
Vehicle counting system and method based on wireless sensor network Download PDFInfo
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- CN103123743A CN103123743A CN2012105338814A CN201210533881A CN103123743A CN 103123743 A CN103123743 A CN 103123743A CN 2012105338814 A CN2012105338814 A CN 2012105338814A CN 201210533881 A CN201210533881 A CN 201210533881A CN 103123743 A CN103123743 A CN 103123743A
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Abstract
The invention discloses a vehicle counting system based on a wireless sensor network. The system comprises a sensor node, a receiving node, a sensor processor and a wireless transmitting and receiving module, wherein the sensor node detects vehicle information; the receiving node receives the vehicle information which is detected by the sensor node; the sensor node adopts a geomagnetic sensor; the sensor processor processes the vehicle information which is acquired by the geomagnetic sensor, and judges whether a vehicle passes; and the wireless transmitting and receiving module sends counting data of the sensor processor to the receiving node through a wireless network. The invention also provides a vehicle counting method adopted by the vehicle counting system based on the wireless sensor network. A vehicle detection node is constructed by using the geomagnetic sensor, so the vehicle counting system is high in sensitivity, high in stability, low in power consumption and long in life. Maintenance cost is greatly reduced. Moreover, the geomagnetic sensor is small in size, so damage to the ground is greatly reduced.
Description
[technical field]
The present invention relates to the transport information detection field, particularly a kind of vehicle counting system based on wireless sensor network.
[background technology]
In intelligent transportation system, it is the most basic part that transport information detects.The transport information detection system is carried out data fusion with the data of various sensor collections, obtains the high transport information flow data of real-time accuracy.These data are made the decision-makings such as relevant traffic administration after being processed by intelligent transportation control center, send instruction by signal lamp or other traffic control means, realize the control to Traffic Systems.
At present, the vehicle detection technology mainly can be divided into intrusive mood, non-intrusion type according to the mounting means of vehicle detecting sensor.
The intrusive mood technology generally need to be installed to vehicle detecting sensor the below, road surface, and the normal technology of using has telefault etc., and its installation and maintenance all can cause damage to road.Intrusive mood technology for detection precision is higher, but road is brought breaking-up during due to its installation and maintenance, makes it be restricted when large tracts of land is used.
The non-intrusion type technology only needs to be installed on the road vehicle detecting sensor or the roadside, and is less to the breaking-up that road causes, but precision can be subjected to the impact of sensor putting position.
[summary of the invention]
In view of this, for overcoming the deficiencies in the prior art, the invention provides the vehicle counting system based on wireless sensor network that a kind of degree of accuracy is high, the road pavement damaged condition is little.
a kind of vehicle counting system based on wireless sensor network, comprise the sensor node that detects information of vehicles and receive the receiving node of the information of vehicles that described sensor node detects, described vehicle counting system comprises sensor processor and radio receiving transmitting module, described sensor node adopts geomagnetic sensor, the information of vehicles that described sensor processor collects described geomagnetic sensor is processed and is judged whether to be identified as vehicle according to the result after processing and passes through, data after described radio receiving transmitting module is counted described sensor processor processes send to described receiving node by wireless network.
Preferably, described radio receiving transmitting module described sensor processor processes and be judged as vehicle by the time just be subjected to triggering work, described radio receiving transmitting module is in dormant state in other cases.
preferably, described sensor node arranges in the following manner, a described sensor node that is used for gathering the telecommunication flow information on this track at intervals is being set on single track, at a described sensor node that is used for gathering the telecommunication flow information on corresponding track placed side by side on each adjacent lane, mutually receive and send messages between described sensor node, the described receiving node of distance described sensor node far away sends the data hop-by-hop to the described receiving node of distance nearest described sensor node by adjacent with it described sensor node, the nearest described sensor node of the described receiving node of distance sends the total data of collecting to described receiving node.
In view of this, for overcoming the deficiencies in the prior art, the invention provides a kind of vehicle counting system based on wireless sensor network.
In view of this, be necessary to provide in fact a kind of above-mentioned vehicle count method that adopts based on the vehicle counting system of wireless sensor network.
A kind of vehicle technology method that adopts based on the vehicle counting system of wireless sensor network comprises the following steps: described geomagnetic sensor catches the fluctuation in magnetic field, and the conversion of terrestrial magnetic field is recorded as the valid data form; Described sensor processor reads the data file of record terrestrial magnetic field conversion; Described sensor processor carries out windowing process to the data that read, and long Geomagnetic signal is divided into many overlapping windows with equal length; Data after described sensor processor adopts moving average filter to windowing are carried out smoothing denoising; The signal amplitude of the data of described sensor processor after to smoothing denoising is carried out normalized; Acceleration information and the movement threshold acceleration of described sensor processor after with normalized compares; If acceleration information surpasses threshold value, marker bit adds 1; Reach predefined number of times if surpass continuously the number of times of threshold value, think that event occurs; After event occured, acceleration information reached predefined number of times lower than the number of times of threshold value and thinks that event finishes; And described vehicle technology system identification is for having a car through described sensor node.
Preferably, if reach in the step that predefined number of times thinks that event occurs at the described number of times that surpasses continuously threshold value, predefined number of times is 3 times.
Preferably, reach lower than the number of times of threshold value in described event generation post-acceleration data in the step that predefined number of times thinks that event finishes, predefined number of times is 4 times.
Vehicle counting system of the present invention has adopted geomagnetic sensor to build the vehicle detection node, and it is highly sensitive, good stability, low in energy consumption, the life-span is long, greatly reduces the cost of its maintenance.And, because the geomagnetic sensor volume is little, wears over the ground the damage degree of coming and also greatly reduce.
[description of drawings]
Fig. 1 is that the preferred embodiments of the present invention are based on the structural representation of the vehicle counting system of wireless sensor network.
Fig. 2 is the geomagnetic data oscillogram that geomagnetic sensor gathers when stationary vehicle.
Fig. 3 is the topological structure schematic diagram of the wireless sensor network that adopts in vehicle counting system in Fig. 1.
Fig. 4 is the schematic flow sheet of the vehicle count method that adopts in vehicle counting system in Fig. 1.
[embodiment]
For understanding better the present invention, the present invention will be described in detail below with reference to accompanying drawing and instantiation.
The preferred embodiments of the present invention provide based on the structural representation of the vehicle counting system of wireless sensor network as shown in fig. 1, comprise sensor node (Sensor Node, SN) 100, sensor node processes device (SN processor) 200, wireless transmit receiver module 300 and receiving node (Access Point, AP) 400.SN 100 carries out the information of vehicles of Real-time Collection Nodes, and the information of vehicles that 200 couples of SN 100 of SN processor collect is analyzed and computing, and wireless transmit receiver module 300 sends to AP 400 with the operation result of SN processor 200 by wireless network.
Vehicle counting system of the present invention adopts geomagnetic sensor to build SN 100, carries out Real-time Collection Nodes Geomagnetic signal.Because the susceptibility of geomagnetic sensor is better, when vehicle being arranged through out-of-date, the irony vehicle can produce disturbance to the terrestrial magnetic field, and geomagnetic sensor captures the fluctuation in magnetic field, and the conversion of terrestrial magnetic field is recorded as the valid data form, and these data export SN processor 200 to.The original waveform that geomagnetic sensor collects as shown in Figure 2.
Adopt one group of data of the every collection of SN 100 of geomagnetic sensor temporarily to be stored in information in storer.The magnetic disturbance characteristic signal that SN processor 200 places utilize vehicle count Algorithm Analysis geomagnetic sensor to collect, variation by geomagnetic data estimates in certain hour the vehicle number through this highway section, thereby realizes for the estimation of the road is clear degree and send to AP 400 by wireless network.The topological structure of wireless sensor network that vehicle counting system of the present invention adopts as shown in Figure 3.On the highway shown in Fig. 3, at intervals, can place a sensor node (SN 100) on single track, be used for gathering the telecommunication flow information on this track.A sensor node placed side by side (SN 100) on every track is used for gathering the telecommunication flow information on corresponding track.Sensor node can be received and sent messages between (SN 100) mutually, apart from receiving node (AP 400) sensor node far away, can be by adjacent with it sensor node, send the data hop-by-hop to the sensor node nearest apart from receiving node (SN 100), this sensor node (SN) sends the total data of collecting to AP 400.
Above-mentioned vehicle counting system based on wireless sensor network, utilize geomagnetic sensor Real-time Collection geomagnetic disturbance signal at Nodes, after utilizing the vehicle count algorithm to do base conditioning to valid data, by Event triggered, count results is sent to receiving node with wireless mode.The raw data that sensor is collected from conventional art directly forwards and different is, the utilize vehicle count algorithm (SN processor 200) of above-mentioned vehicle counting system on sensor node (SN 100) processed the magnetic data primitively that gathers, and only have and be identified as vehicle through out-of-date when sensor node (SN 100), just can transfer wireless transmit receiver module 300 to operating conditions from dormant state, send vehicular characteristics data.Main modular of power consumption in whole system due to radio receiving transmitting module 300, thereby adopt Event triggered to make radio receiving transmitting module 300 work in above-mentioned vehicle counting system, radio receiving transmitting module 300 is not in dormant state when having event to occur, greatly reduce the power consumption of whole system, extended its mission life.
Vehicle counting system of the present invention has adopted a kind of novel vehicle count method, the geomagnetic disturbance signal that 200 pairs of SN processors collect is done pre-service, pretreated operation mainly comprises windowing, smoothing denoising, normalization, resampling etc., realization is to the vehicle count through sensor node, thereby vehicle flowrate is estimated, to reach the Based Intelligent Control to traffic and transportation system.
Below with reference to Fig. 4, the process of the vehicle count method that adopts in above-mentioned vehicle counting system is described in detail.
At first, in step S1, SN processor 200 reads the relevant data file of information of vehicles that SN 100 collects.
In step S2, the data that read are carried out windowing process, long Geomagnetic signal is divided into many overlapping windows with equal length.Vehicle is carried out windowing through the acceleration signal of out-of-date collection, reduce the single data operation quantity, accelerate arithmetic speed.
In step S3, the data after adopting moving average filter to windowing are carried out smoothing denoising.Moving average filter is usually used in time-domain filtering, can reduce random noise, has kept simultaneously sharp-pointed step response, suppresses random noise and keeps precipitous edge.
In step S4, the signal amplitude of the data after smoothing denoising is carried out normalized.Because different automobile types is different to the disturbance of Geomagnetic signal, data (signal amplitude) are carried out normalized, can eliminate the difference that different automobile types is brought when identification.
In step S5, acceleration information and movement threshold acceleration after processing are compared.
If surpass threshold value in step S5, marker bit adds 1(step S6).
In step S7, the number of times that judgement surpasses threshold value continuously reaches predefined number of times (being set as in Fig. 43 times).Do not reach predefined number of times if surpass continuously threshold value, think that event does not occur.
Reach predefined number of times (being set as in Fig. 43 times) if surpass continuously the number of times of threshold value, think that (step S8) occurs event.
After event occured, acceleration information reached predefined number of times (being set as in Fig. 44 times) lower than the number of times of threshold value, thought that event finishes (step S9).At this moment, system identification is for having a car through sensor node.
Above-mentioned vehicle counting system utilizes wireless sensor network to build traffic monitoring system, is used for the detection of transport information.Wireless sensor network has very high configuration flexibility, and the extensibility that this has strengthened traffic monitoring system makes it can large scale deployment.And its accuracy of detection is high, be convenient to be installed on maintenance, the electric advantage such as collaborative of little and more piece affected by environment, determined that it has vast potential for future development.
Above-mentioned vehicle counting system has been invented the network topology structure of wireless sensor of a kind of single receiving node, multisensor node.Access node has superior computational resource and powerful ability to communicate, and accessible street lamp or Ethernet carry out active power supply.Sensor node is used for gathering for transport information, and its sample frequency and node putting position and quantity can be set according to different application scenarioss.
Above-mentioned vehicle counting system has adopted a kind of geomagnetic sensor, builds the vehicle detection node, and it is highly sensitive, good stability, low in energy consumption, the life-span is long, greatly reduce the cost of its maintenance, and because its volume is little, wears over the ground the damage degree of coming and compare also reduction greatly of technology before.
The above exemplifying embodiment has only been expressed part embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.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 (6)
1. vehicle counting system based on wireless sensor network, comprise the sensor node that detects information of vehicles and receive the receiving node of the information of vehicles that described sensor node detects, it is characterized in that: described vehicle counting system comprises sensor processor and radio receiving transmitting module, described sensor node adopts geomagnetic sensor, the information of vehicles that described sensor processor collects described geomagnetic sensor is processed and is judged whether to be identified as vehicle according to the result after processing and passes through, data after described radio receiving transmitting module is counted described sensor processor processes send to described receiving node by wireless network.
2. the vehicle counting system based on wireless sensor network according to claim 1, it is characterized in that: described radio receiving transmitting module described sensor processor processes and be judged as vehicle by the time just be subjected to triggering work, described radio receiving transmitting module is in dormant state in other cases.
3. the vehicle counting system based on wireless sensor network according to claim 2, it is characterized in that: described sensor node arranges in the following manner, a described sensor node that is used for gathering the telecommunication flow information on this track at intervals is being set on single track, at a described sensor node that is used for gathering the telecommunication flow information on corresponding track placed side by side on each adjacent lane, mutually receive and send messages between described sensor node, the described receiving node of distance described sensor node far away sends the data hop-by-hop to the described receiving node of distance nearest described sensor node by adjacent with it described sensor node, the nearest described sensor node of the described receiving node of distance sends the total data of collecting to described receiving node.
4. vehicle technology method that the vehicle counting system based on wireless sensor network described according to claim 1 adopts comprises the following steps:
Described geomagnetic sensor catches the fluctuation in magnetic field, and the conversion of terrestrial magnetic field is recorded as the valid data form;
Described sensor processor reads the data file of record terrestrial magnetic field conversion;
Described sensor processor carries out windowing process to the data that read, and long Geomagnetic signal is divided into many overlapping windows with equal length;
Data after described sensor processor adopts moving average filter to windowing are carried out smoothing denoising;
The signal amplitude of the data of described sensor processor after to smoothing denoising is carried out normalized;
Acceleration information and the movement threshold acceleration of described sensor processor after with normalized compares;
If acceleration information surpasses threshold value, marker bit adds 1;
Reach predefined number of times if surpass continuously the number of times of threshold value, think that event occurs;
After event occured, acceleration information reached predefined number of times lower than the number of times of threshold value and thinks that event finishes; And
Described vehicle technology system identification is for having a car through described sensor node.
5. vehicle count method according to claim 4 is characterized in that: if reach in the step that predefined number of times thinks that event occurs at the described number of times that surpasses continuously threshold value, predefined number of times is 3 times.
6. vehicle count method according to claim 5 is characterized in that: reach lower than the number of times of threshold value in described event generation post-acceleration data in the step that predefined number of times thinks that event finishes, predefined number of times is 4 times.
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| CN103593983A (en) * | 2013-11-28 | 2014-02-19 | 苏州大学 | System and method for monitoring traffic flow |
| CN103593978A (en) * | 2013-11-28 | 2014-02-19 | 苏州大学 | Traffic flow measuring system and method based on wireless sensor network |
| CN103927884A (en) * | 2014-04-21 | 2014-07-16 | 哈尔滨工业大学 | Vehicle detection device based on acceleration sensor and light sensor |
| CN103927871A (en) * | 2014-04-21 | 2014-07-16 | 哈尔滨工业大学 | Vehicle detecting device based on multi-kind sensor information |
| CN105788287A (en) * | 2016-02-04 | 2016-07-20 | 李福军 | City road vehicle information acquisition system |
| CN103838981B (en) * | 2014-03-27 | 2016-08-31 | 交通运输部科学研究院 | The metering method of group refueling amount |
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| CN110232828A (en) * | 2019-07-29 | 2019-09-13 | 深圳市万泊科技有限公司 | A kind of a variety of aiding sensors fusion detection methods based on geomagnetic sensor |
| WO2020006925A1 (en) * | 2018-07-05 | 2020-01-09 | 南京理工大学 | Vehicle detection method based on uniaxial geomagnetic sensor |
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Application publication date: 20130529 |