CN101217002A - A wireless transducer network device based on unloading lot detection based on magnetic sensitive technology - Google Patents
A wireless transducer network device based on unloading lot detection based on magnetic sensitive technology Download PDFInfo
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- CN101217002A CN101217002A CNA2008100592210A CN200810059221A CN101217002A CN 101217002 A CN101217002 A CN 101217002A CN A2008100592210 A CNA2008100592210 A CN A2008100592210A CN 200810059221 A CN200810059221 A CN 200810059221A CN 101217002 A CN101217002 A CN 101217002A
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Abstract
The invention belongs to a wireless sensor network field, and relates to a wireless sensor network device for detecting parking state by using magnetic-sensing technology. The device comprises an anisotropic magneto-resistance sensor, a filtering/de-noising unit, a differential amplification unit, a DC bias unit, a control unit, and a radio frequency unit. By conducting pre-processing an signal output from the anisotropic magneto-resistance sensor, the device can calculate parking state of the anisotropic magneto-resistance sensor at a parking position in real time by a corresponding calculation method, and send data to a base station via a wireless transmission communication mode for performing vehicle control and vehicle induction. The device has wide application prospect in road traffic stream detection, parking lot management, road intersection management, etc.
Description
Technical field
The invention belongs to the wireless sensor network field, specifically is a kind of wireless sensor network apparatus based on the magnetic sensitive technology unloading lot detection.
Background technology
Along with the socioeconomic generally raising that develops rapidly with living standards of the people, the recoverable amount rapid growth of various vehicles, this just not only needs a large amount of parking lots, and need effectively detect the parking stall in parking lot.Existing what the detection of parking position was adopted is traditional parking stall detector, and it detects vehicle and whether exist by bury telefault underground at subsurface.The shortcoming of this method is that winding volume is huge, the coil laying is serious to ground failure, and the coil life-span is short, the system maintenance cost is high.
Summary of the invention
The purpose of this invention is to provide a kind of wireless sensor network apparatus based on the magnetic sensitive technology unloading lot detection.
What the present invention will solve is huge, the problems such as the coil laying is serious to ground failure, coil life-span weak point, system maintenance cost height of winding volume that existing parking stall detector is deposited.
For realizing above purpose, anisotropy magnetoresistive transducer of the present invention (AMR sensor), filtering noise reduction unit, direct current biasing unit, difference amplifying unit, control module and radio frequency unit; The anisotropy magnetoresistive transducer is connected in the filtering noise reduction unit, and filtering noise reduction unit and direct current biasing unit are connected in the difference amplifying unit, and the difference amplifying unit is connected in control module, and control module and radio frequency unit are connected to each other.
The anisotropy magnetoresistive transducer is used for gathering in real time automobile to be changed through the out-of-date terrestrial magnetic field that causes, and output correspondent voltage signal;
The filtering noise reduction unit is used for removing the noise section of anisotropy magnetoresistive transducer output signal, improves signal to noise ratio (S/N ratio);
The direct current biasing unit is used to provide dc offset voltage, guarantees that signal can distortion when amplifying;
The difference amplifying unit is used for the output of anisotropy magnetoresistive transducer is fully amplified, and the signal after amplifying is sent into the AD modular converter of control module;
The AD converter that the control module utilization carries is gathered the output of difference amplifying unit in real time, and whether draw through certain algorithm process has automobile storage to exist on the parking stall;
The control signal that control module provides by the IO mouth is finished resetting of anisotropy magnetoresistive transducer and set operation, and assurance anisotropy magnetoresistive transducer is worked under the higher state of sensitivity;
Control module is also coordinated effective operation of total system, control system power consumption, extension fixture working time;
Radio frequency unit and base station are set up radio communication and are got in touch, and carry out exchanges data.
The present invention is by the pre-service to anisotropy magnetoresistive transducer (AMR sensor) output signal, adopt corresponding calculation method, calculate the parking stall state of parking stall, device place in real time, and data are sent to the base station to carry out vehicle control and vehicle guidance by the communication mode of wireless transmission.
The present invention have vehicle detect accurate, convenient for installation and maintenance, antijamming capability is strong, volume is little, little, advantage such as cost is lower affected by environment, is applicable to the multiple occasion in parking lot, indoor and outdoor.The present invention has broad application prospects in the vehicle detection field.
Description of drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a workflow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in the figure, the present invention is made up of anisotropy magnetoresistive transducer (AMR sensor), filtering noise reduction unit (module), direct current biasing unit (module), difference amplifying unit (module), control module (module) and radio frequency unit (module).Anisotropy magnetoresistive transducer (AMR sensor) is the twin shaft sensor, comprise sensors A axle and sensor B axle, these two sensitive axes are respectively to place perpendicular to ground and the direction that is parallel to the parking stall, make it gather automobile on the both direction of parking stall in real time through the out-of-date terrestrial magnetic field variation that causes with being parallel to perpendicular to ground, and output correspondent voltage signal.The filtering noise reduction unit comprises filtering noise reduction unit A and B, and the direct current biasing unit comprises direct current biasing unit A and B, and the difference amplifying unit comprises difference amplifying unit A and B.The A axle and the B axle of anisotropy magnetoresistive transducer are connected to ripple noise reduction unit A and B, ripple noise reduction unit A and B are connected to difference amplifying unit A and B, direct current biasing unit A and B are connected to difference amplifying unit A and B equally, difference amplifying unit A and B are connected in control module AMR, and control module and radio frequency unit are connected to each other.
Filtering noise reduction unit A and B are used for removing the A axle of anisotropy magnetoresistive transducer (AMR sensor) and the noise signal of these two axle outputs of B axle, improve signal to noise ratio (S/N ratio).Direct current biasing unit A and B are used to provide two dc offset voltages respectively, guarantee that two paths of signals can distortion when amplifying; Difference amplifying unit A and B are used for the output of two axles of anisotropy magnetoresistive transducer is amplified fully, and the signal after amplifying are sent into the AD modular converter of control module.
The AD converter that the control module utilization carries is gathered the output of difference amplifying unit in real time, and whether draw the parking stall through certain algorithm process has automobile storage to exist.The control signal that control module provides by the IO mouth is finished resetting of anisotropy magnetoresistive transducer and set operation, and assurance anisotropy magnetoresistive transducer is worked under the higher state of sensitivity.Control module is also coordinated effective operation of total system, control system power consumption, extension fixture working time.Radio frequency unit and base station are set up radio communication and are got in touch, and carry out exchanges data.
The present invention to the detection principle of parking stall is: the middle part that the present invention is installed in the parking stall, when vehicle process anisotropy magnetoresistive transducer induction region, ground magnetic signal in the anisotropy magnetoresistive transducer induction region is exerted an influence, the anisotropy magnetoresistive transducer detects this variation and output correspondent voltage signal, filtering noise reduction, direct current biasing and difference amplifying unit extract this signal and amplify, and draw the voltage signal that contains information of vehicles.The voltage signal that contains information of vehicles is delivered to the AD converter of control module, converts digital signal to through AD and handles.
The present invention is electrifying startup under the situation that does not have vehicle on the parking stall.At first each module is carried out the initialization setting behind the electrifying startup of the present invention, the AD translation function of start-up control unit is gathered the voltage signal of difference amplification output then, carry out background magnetic field self study and training, when a plurality of data of continuous acquisition all compare near the time, just think that current background magnetic field is a more stable magnetic field, and current background magnetic field as reference magnetic field, the current voltage that collects as reference voltage.
When vehicle enters the parking stall, because the terrestrial magnetic field at place, parking stall is affected and changes, this variation is reflected in the output of difference amplifying unit through anisotropy magnetoresistive transducer, filtering noise reduction unit, direct current biasing unit be exactly the variation of voltage, the degree of this change in voltage can surpass default thresholding, and just thinking this moment has automobile storage to exist on the parking stall.Because the anisotropy magnetoresistive transducer is a twin shaft sensor, compare with reference voltage when surpassing default thresholding when wherein any one output voltage of two difference amplifying units, just thinking has vehicle to be parked on the parking stall.Avoided the erroneous judgement that causes owing to vehicle difference like this and failed to judge.
Bigger disturbing magnetic field may cause the decay of sensor output signal, and in order to reduce the output of this influence and maximum signal, the present invention guarantees that by the set-reset function of sensor the anisotropy magnetoresistive transducer always works in the high sensitivity state.Set-reset operation is carried out at interval according to default timing, the big I in this time interval according to the parking stall on the spot the situation of disturbing magnetic field be provided with flexibly.
For being overlapped under the perfect low-power consumption mode one, whole device works, control module and radio frequency unit only are in normal mode of operation in of short duration detection time, all the other times are in the super low-power consumption pattern and cut off the power supply of anisotropy magnetoresistive transducer, and the assurance system carries out work with minimum average power consumption.Switching between normal mode of operation and the super low-power consumption pattern is assisted realization by timer.
Radio frequency unit data-transmission mode of the present invention can be divided in real time and timing, when the parking stall state changes, upload data in real time and give the base station, when the parking stall state does not change, give the base station according to the timing interval timing reported data that device is default, timing can be provided with by the base station is convenient.
Anisotropy magnetoresistive transducer among the present invention adopts the twin shaft anisotropy magnetoresistive transducer HMC1052 of Honeywell (Honeywell) company, and near the linearity that it is exported zero magnetic field is better, does not have hysteresis effect.
Radio frequency unit frequency of operation among the present invention is 433MHz, 255 of channel numbers, the message transmission rate of radio frequency unit and adjustable power, peak transfer rate 500kbps, the maximum wireless transmission range that maximum transmission power 10dBm, radio frequency unit are laid in the ground bedding fault is 300m, and radio frequency unit adopts omnidirectional's ceramic antenna of vertical polarization directions, maximum antenna gain 0.5dBi, maximum standing-wave ratio (SWR) 2.0.
Operating voltage 3.3V of the present invention adopts 8 joint high capacity alkaline battery strings and connects power supply, every batteries voltage 1.5V, and battery capacity is 4000mAh, a year self-discharge rate is lower than 10%.Working current during the super low-power consumption state is 0.3mA, maximum operating currenbt 30mA, as calculated
But the present invention's stand-by operation is more than 1 year, and battery of the present invention has easy purchase, easily changeable characteristics.
Whether the existence why the present invention adopts twin shaft fusion treatment algorithm to detect vehicle is because the structure of various vehicles is different with manufacture method, ferromagnetic material distribution and magnetic characteristic on the vehicle are also widely different, are difficult to like this adopt the single algorithm of uniaxial magnetic dependent sensor to come all vehicles are detected judgement.So the present invention adopts the twin shaft magneto-dependent sensor HMC1052 of Honeywell (Honeywell) company, perpendicular to ground and the variation that is parallel to detection magnetic field on the both direction of parking stall, overcome effectively because the algorithm problem that the ferromagnetic distribution character difference of vehicle is brought.
Control module of the present invention adopts has the function that background magnetic field is learnt and trained, and is that residing background magnetic field all is not quite similar owing to the parking stall of diverse geographic location and the parking stall of adopting the different designs method.The present invention is stored in the control module by at first the output signal of differential amplifier being gathered and the current background magnetic field that this signal reflects is decided to be standard Magnetic Field after starting, and thinks that just the parking stall has automobile storage to exist after the degree that departs from standard Magnetic Field when magnetic field, parking stall surpasses the thresholding of setting.
The English full name of anisotropy magnetoresistive transducer of the present invention is: anisotropicmagneto resistive abbreviates the AMR sensor as.
Claims (4)
1. the wireless sensor network apparatus based on the magnetic sensitive technology unloading lot detection is characterized in that it comprises anisotropy magnetoresistive transducer, filtering noise reduction unit, direct current biasing unit, difference amplifying unit, control module and radio frequency unit; The anisotropy magnetoresistive transducer is connected in the filtering noise reduction unit, and filtering noise reduction unit and direct current biasing unit are connected in the difference amplifying unit, and the difference amplifying unit is connected in control module, and control module and radio frequency unit are connected to each other;
The anisotropy magnetoresistive transducer is used for gathering in real time automobile to be changed through the out-of-date terrestrial magnetic field that causes, and output correspondent voltage signal;
The filtering noise reduction unit is used for removing the noise section of anisotropy magnetoresistive transducer output signal, improves signal to noise ratio (S/N ratio);
The direct current biasing unit is used to provide dc offset voltage, guarantees that signal can distortion when amplifying;
The difference amplifying unit is used for the output of anisotropy magnetoresistive transducer is fully amplified, and the signal after amplifying is sent into the AD modular converter of control module;
The AD converter that the control module utilization carries is gathered the output of difference amplifying unit in real time, and whether draw through certain algorithm process has automobile storage to exist on the parking stall;
The control signal that control module provides by the IO mouth is finished resetting of anisotropy magnetoresistive transducer and set operation, and assurance anisotropy magnetoresistive transducer is worked under the higher state of sensitivity;
Control module is also coordinated effective operation of total system, control system power consumption, extension fixture working time;
Radio frequency unit and base station are set up radio communication and are got in touch, and carry out exchanges data.
2. a kind of wireless sensor network apparatus based on the magnetic sensitive technology unloading lot detection according to claim 1 is characterized in that the anisotropy magnetoresistive transducer is the twin shaft sensor, comprises sensors A axle and sensor B axle; The filtering noise reduction unit comprises filtering noise reduction unit A and B; The direct current biasing unit comprises direct current biasing unit A and B; The difference amplifying unit comprises difference amplifying unit A and B;
The A axle and the B axle of anisotropy magnetoresistive transducer are connected to ripple noise reduction unit A and B, ripple noise reduction unit A and B are connected to difference amplifying unit A and B, direct current biasing unit A and B are connected to difference amplifying unit A and B equally, and difference amplifying unit A and B are connected in control module;
The anisotropy magnetoresistive transducer is perpendicular to ground be parallel on the both direction of parking stall the variation that detects magnetic field, and output correspondent voltage signal; Filtering noise reduction unit A and B are used for removing the noise signal of two axles outputs of anisotropy magnetoresistive transducer, and direct current biasing unit A and B are used to provide two dc offset voltages respectively, guarantee that two paths of signals can distortion when amplifying; Difference amplifying unit A and B are used for the output of two axles of anisotropy magnetoresistive transducer is amplified fully.
3. a kind of wireless sensor network apparatus based on the magnetic sensitive technology unloading lot detection according to claim 1 is characterized in that the anisotropy magnetoresistive transducer adopts the twin shaft anisotropy magnetoresistive transducer HMC1052 of Honeywell (Honeywell) company.
4. a kind of wireless sensor network apparatus according to claim 1 based on the magnetic sensitive technology unloading lot detection, it is characterized in that the radio frequency unit frequency of operation is 433MHz, channel number is 255, the message transmission rate of radio frequency unit and adjustable power, peak transfer rate is 500kbps, maximum transmission power is 10dBm, the maximum wireless transmission range that radio frequency unit is laid in the ground bedding fault is 300m, radio frequency unit adopts omnidirectional's ceramic antenna of vertical polarization directions, maximum antenna gain is 0.5dBi, and maximum standing-wave ratio (SWR) is 2.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100592210A CN101217002A (en) | 2008-01-03 | 2008-01-03 | A wireless transducer network device based on unloading lot detection based on magnetic sensitive technology |
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| CNA2008100592210A CN101217002A (en) | 2008-01-03 | 2008-01-03 | A wireless transducer network device based on unloading lot detection based on magnetic sensitive technology |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129726A (en) * | 2010-12-31 | 2011-07-20 | 钟明 | Multi-stage parking data collection system |
| CN102226931A (en) * | 2011-05-27 | 2011-10-26 | 迈锐数据（北京）有限公司 | Vehicle detection device |
| CN102280034A (en) * | 2011-05-27 | 2011-12-14 | 迈锐数据（北京）有限公司 | Vehicle detection method |
| CN102289939A (en) * | 2011-07-05 | 2011-12-21 | 北京航空航天大学 | Vehicle/traffic flow detection method based on three-axle magnetoresistive sensor |
| CN102522000A (en) * | 2011-12-16 | 2012-06-27 | 广东朗视光电技术有限公司 | Magnetostatic field fluxgate parking space detection system |
| CN102708695A (en) * | 2012-05-27 | 2012-10-03 | 厦门大学嘉庚学院 | Road vehicle intelligent detection method based on HMC1022 magnetic sensor |
| CN102722995A (en) * | 2011-03-31 | 2012-10-10 | 无锡物联网产业研究院 | Parking space detection method, system thereof and parking space occupied probability calculation device |
| CN102722987A (en) * | 2011-12-19 | 2012-10-10 | 北京时代凌宇科技有限公司 | Roadside parking space detection method |
| CN103236188A (en) * | 2013-04-25 | 2013-08-07 | 南京邮电大学 | Wireless magnetoresistive sensor network-based collaborative decision-making parking detection method |
| CN103606295A (en) * | 2013-10-30 | 2014-02-26 | 中国科学院上海微系统与信息技术研究所 | Parking-space information detection method |
| CN103632569A (en) * | 2013-11-13 | 2014-03-12 | 北京青创智通科技有限公司 | Double-axis geomagnetic stall detecting method and double-axis geomagnetic stall detecting device |
| CN104155645A (en) * | 2014-08-07 | 2014-11-19 | 深圳市博德维环境技术有限公司 | Vehicle position detecting method and vehicle position detecting system |
| CN104167100A (en) * | 2014-08-29 | 2014-11-26 | 合肥网泰信息科技有限公司 | Road vehicle perceptual information acquisition device based on wireless sensor network |
| CN104183141A (en) * | 2014-08-28 | 2014-12-03 | 哈尔滨工程大学 | Wireless geomagnetism carport detector based on Internet of Things |
| CN104346951A (en) * | 2013-08-06 | 2015-02-11 | 江苏盛天交通科技有限公司 | Device and method for monitoring vehicles of parking lot based on interference updating of geomagnetic detector |
| CN105913628A (en) * | 2015-11-27 | 2016-08-31 | 株洲壹星科技股份有限公司 | Magnetic sensor output circuit and data wireless transmission and system control method |
| CN106548658A (en) * | 2016-11-22 | 2017-03-29 | 广西大学 | A kind of wireless anti-interference parking stall measure system of earth magnetism sensing |
| CN106781671A (en) * | 2017-01-06 | 2017-05-31 | 武汉键停科技有限公司 | It is a kind of to be based on two kinds of parking space state detection methods of sensor cross checking |
| CN110383359A (en) * | 2017-03-28 | 2019-10-25 | 爱知制钢株式会社 | Concentrator marker detection system and concentrator marker detection method |
| CN111915902A (en) * | 2019-05-08 | 2020-11-10 | 中央大学 | Near-source magnetic field variation detection system and detection method thereof |
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2008
- 2008-01-03 CN CNA2008100592210A patent/CN101217002A/en active Pending
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129726A (en) * | 2010-12-31 | 2011-07-20 | 钟明 | Multi-stage parking data collection system |
| CN102722995B (en) * | 2011-03-31 | 2014-04-30 | 无锡物联网产业研究院 | Parking space detection method, system thereof and parking space occupied probability calculation device |
| CN102722995A (en) * | 2011-03-31 | 2012-10-10 | 无锡物联网产业研究院 | Parking space detection method, system thereof and parking space occupied probability calculation device |
| CN102280034A (en) * | 2011-05-27 | 2011-12-14 | 迈锐数据（北京）有限公司 | Vehicle detection method |
| CN102226931A (en) * | 2011-05-27 | 2011-10-26 | 迈锐数据（北京）有限公司 | Vehicle detection device |
| CN102289939A (en) * | 2011-07-05 | 2011-12-21 | 北京航空航天大学 | Vehicle/traffic flow detection method based on three-axle magnetoresistive sensor |
| CN102522000A (en) * | 2011-12-16 | 2012-06-27 | 广东朗视光电技术有限公司 | Magnetostatic field fluxgate parking space detection system |
| CN102722987B (en) * | 2011-12-19 | 2014-03-05 | 北京时代凌宇科技有限公司 | Roadside parking space detection method |
| CN102722987A (en) * | 2011-12-19 | 2012-10-10 | 北京时代凌宇科技有限公司 | Roadside parking space detection method |
| CN102708695A (en) * | 2012-05-27 | 2012-10-03 | 厦门大学嘉庚学院 | Road vehicle intelligent detection method based on HMC1022 magnetic sensor |
| CN103236188A (en) * | 2013-04-25 | 2013-08-07 | 南京邮电大学 | Wireless magnetoresistive sensor network-based collaborative decision-making parking detection method |
| CN103236188B (en) * | 2013-04-25 | 2015-06-17 | 南京邮电大学 | Wireless magnetoresistive sensor network-based collaborative decision-making parking detection method |
| CN104346951A (en) * | 2013-08-06 | 2015-02-11 | 江苏盛天交通科技有限公司 | Device and method for monitoring vehicles of parking lot based on interference updating of geomagnetic detector |
| CN103606295A (en) * | 2013-10-30 | 2014-02-26 | 中国科学院上海微系统与信息技术研究所 | Parking-space information detection method |
| CN103606295B (en) * | 2013-10-30 | 2016-03-30 | 中国科学院上海微系统与信息技术研究所 | A kind of Parking-space information detection method |
| CN103632569A (en) * | 2013-11-13 | 2014-03-12 | 北京青创智通科技有限公司 | Double-axis geomagnetic stall detecting method and double-axis geomagnetic stall detecting device |
| CN103632569B (en) * | 2013-11-13 | 2016-11-23 | 雷振山 | A kind of two-axis geomagnetic method for detecting parking stalls and device |
| CN104155645B (en) * | 2014-08-07 | 2017-02-22 | 深圳市博德维环境技术有限公司 | Vehicle position detecting method and vehicle position detecting system |
| CN104155645A (en) * | 2014-08-07 | 2014-11-19 | 深圳市博德维环境技术有限公司 | Vehicle position detecting method and vehicle position detecting system |
| CN104183141A (en) * | 2014-08-28 | 2014-12-03 | 哈尔滨工程大学 | Wireless geomagnetism carport detector based on Internet of Things |
| CN104167100A (en) * | 2014-08-29 | 2014-11-26 | 合肥网泰信息科技有限公司 | Road vehicle perceptual information acquisition device based on wireless sensor network |
| CN105913628A (en) * | 2015-11-27 | 2016-08-31 | 株洲壹星科技股份有限公司 | Magnetic sensor output circuit and data wireless transmission and system control method |
| CN105913628B (en) * | 2015-11-27 | 2019-05-24 | 株洲壹星科技股份有限公司 | Magnetic Sensor output circuit and data wireless transmission and control system method |
| CN106548658A (en) * | 2016-11-22 | 2017-03-29 | 广西大学 | A kind of wireless anti-interference parking stall measure system of earth magnetism sensing |
| CN106781671A (en) * | 2017-01-06 | 2017-05-31 | 武汉键停科技有限公司 | It is a kind of to be based on two kinds of parking space state detection methods of sensor cross checking |
| CN110383359A (en) * | 2017-03-28 | 2019-10-25 | 爱知制钢株式会社 | Concentrator marker detection system and concentrator marker detection method |
| CN111915902A (en) * | 2019-05-08 | 2020-11-10 | 中央大学 | Near-source magnetic field variation detection system and detection method thereof |
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