CN101908278A - Wireless magnetic induction intensity vehicle detection method and device - Google Patents
Wireless magnetic induction intensity vehicle detection method and device Download PDFInfo
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Abstract
The invention discloses a wireless magnetic induction intensity vehicle detection method and a wireless magnetic induction intensity vehicle detection device. The method comprises the following steps of: a, sensing the space magnetic induction intensity and converting the space magnetic induction intensity into an electric signal; b, transmitting and amplifying the electric signal in the step a in a serial mode; c, converting the electric signal in the step b into a digital signal through A/D conversion, and calculating a magnetic induction intensity value; d, comparing the obtained magnetic induction intensity value in the step c with the space constant magnetic induction intensity value so as to obtain a detection result, judging whether a vehicle is present or not when the magnetic induction intensity value is greater than or smaller than a threshold, and performing advanced signal processing on a sampled signal to acquire the traffic, vehicle speed, occupied time, vehicle type, and other traffic information; and e, transmitting the detection result in the step d to an information center in a wireless mode. The wireless magnetic induction intensity vehicle detection device comprises a magnetic induction intensity sensor, a multiplexer, an analog signal amplifier, a microcontroller and a wireless data transceiver module, which are connected in turn and are connected with a power supply. The wireless magnetic induction intensity vehicle detection method is simple and convenient, and the wireless magnetic induction intensity vehicle detection device is convenient to set.
Description
Technical field
The signals of vehicles that the present invention relates to field of traffic detects and field of wireless transmission specifically a kind of wireless magnetic induction intensity vehicle detection method and device.
Background technology
Existing transportation network overload improves an urgent demand that its operational efficiency is transport development.Important steps such as traffic administration, assessment and planning must be carried out on the basis of grasping existing traffic.The mass traffic information how highly effective gathering modern city system is produced is a challenging problem.It is its basic means that the utilization electronic information technology is gathered road traffic information, has occurred telefault, video, a few class major technology of microwave (RTMS) in the engineering practice in decades.But it is not enough that it exists respectively in some aspects: the big blocking-up traffic of telefault installation work amount, and the maintenance cost height that is damaged easily; The technology of handling based on video image is subjected to natural weather condition, installation site and road surface complexity effect big, the precision deficiency; RTMS is subject to shelter (as the isolation strip) influence, and laying is had relatively high expectations, and the installation site influences it and detects performance, and the cost height, and laying investment on a large scale is huge.
Summary of the invention
The objective of the invention is to solve the problems of the technologies described above, provide a kind of simple and convenient, the wireless magnetic induction intensity vehicle detection method of being convenient to implement.
The technical scheme that realizes the foregoing invention purpose is as follows:
A kind of wireless magnetic induction intensity vehicle detection method comprises the steps:
A. aware space magnetic induction, and convert thereof into electric signal;
B. the electric signal of step a is issued with serial and transmitted at that time and amplify;
C. the electric signal with step b converts digital signal to by A/D, and extrapolates the magnetic induction value;
D. the constant magnetic induction value in magnetic induction value that step c is obtained and space compares, obtain testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle the transport information that obtains flow, the speed of a motor vehicle, holding time and vehicle;
E. the testing result with steps d is sent to information center by wireless mode.
Wherein, a plurality of magnetic induction detecting devices are set on the road surface, each magnetic induction detecting device carries out the operation of step a to steps d, the testing result that each magnetic induction detecting device obtains is sent to a trackside receiver by wireless mode, and this trackside receiver realizes that data storage, data download and data transmission are to information center.
Apart from distance, the testing result of described a plurality of magnetic induction detecting devices directly or via one or more repeaters is sent to the trackside receiver after by the wireless mode transfer according to detecting device placement location and receiver.
Another object of the present invention has than low production cost for providing a kind of, and installation and maintenance are easy to be fit to convenient deployment on a large scale, and has than the wireless magnetic induction intensity vehicle pick-up unit of high detection performance with the detection information of enriching.The technical scheme that realizes this purpose is as follows:
A kind of wireless magnetic induction intensity vehicle pick-up unit comprises:
The aware space magnetic induction, and convert thereof into the magnetic induction sensor of electric signal;
The induced signal time division multiplex of spatial triaxial is become the multiplexer of serial signal;
Analog signal amplifier with above-mentioned signal power amplification;
Convert the electric signal that amplifies to digital signal by A/D, and extrapolate the magnetic induction value, and with the constant magnetic induction value in space relatively, obtain the microcontroller of testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle the transport information that obtains flow, the speed of a motor vehicle, holding time and vehicle;
With the wireless data transceiver module of testing result with the wireless mode transmission;
Wherein magnetic induction sensor, multiplexer, analog signal amplifier, microcontroller and wireless data transceiver module are connected successively, and all are connected with a power supply, form the magnetic induction detecting device jointly.
Wherein said magnetic induction detecting device is a plurality of, and each magnetic induction detecting device also comprises a wireless data transceiver module that is connected with power supply with microcontroller, itself and the trackside receiver wireless connections with wireless data transceiver module.Described trackside receiver comprises microprocessor and the wireless data transceiver module that is electrically connected with it, local data interface module, data memory module and mobile communication module, and each several part links to each other with same power supply.
Described wireless magnetic induction intensity vehicle pick-up unit also comprises at least one repeater, the testing result of described magnetic induction detecting device is sent to the trackside receiver by at least one repeater with wireless mode, and described repeater comprises microprocessor, wireless data transceiver module and the power supply of mutual electrical connection.
Pick-up unit optimum of the present invention is to comprise a plurality of magnetic induction detecting devices, a plurality of repeater and a trackside receiver.According to detecting device placement location and receiver apart from distance, the testing result of a plurality of magnetic induction detecting devices directly sends or is sent to the trackside receiver by one or more repeaters, provides local storage, local data to download and testing result concentrated by mobile communication module by the trackside receiver and is sent to information center.
Compared with prior art, the present invention has following advantage:
1, accuracy of detection height, basic consistent with existing telefault, be higher than video and RTMS;
2, installation is fast and convenient needn't the extensive damage road surface, and disposable implantation does not need complicated adjustment and maintenance;
3, cost is low, less than 1/5 of telefault or RTMS system, is more suitable for a large amount of deployment, can obtain the high-resolution microcirculation information of road network;
4, strong interference immunity detects performance and is subjected to physical environment variation and road table barrier to influence little substantially;
5, detect abundant information, can obtain careful vehicle individual information, and then realize that vehicle is estimated and vehicle recognition geometric ratio telefault and RTMS etc. more enrich function, the network operation parameter of can satisfying the need is on this basis estimated comprehensively;
6, applied range owing to little, the passive power supply of its volume, install fast and conveniently, can be applicable to construction volumes restriction such as parking garage, bridge, square, tunnel or occasion that can't wired power supply.
Description of drawings
Fig. 1 is the structural representation of wireless magnetic induction intensity vehicle pick-up unit of the present invention;
Fig. 2 is the structural representation of the preferred embodiment of wireless magnetic induction intensity vehicle pick-up unit of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of wireless magnetic induction intensity vehicle detection method comprises the steps:
A. aware space magnetic induction, and convert thereof into electric signal;
B. the electric signal of step a is issued with serial and transmitted at that time and amplify;
C. the electric signal with step b converts digital signal to by A/D, and extrapolates the magnetic induction value;
D. the constant magnetic induction value in magnetic induction value that step c is obtained and space compares, obtain testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle the transport information that obtains flow, the speed of a motor vehicle, holding time and vehicle;
E. the testing result with steps d is sent to information center by wireless mode.
Wherein, a plurality of magnetic induction detecting devices are set on the road surface, each magnetic induction detecting device carries out the operation of step a to steps d, the testing result that each magnetic induction detecting device obtains is sent to the trackside receiver by wireless mode, and this trackside receiver realizes that data storage, data download and data transmission are to information center.
Apart from distance, the testing result of described a plurality of magnetic induction detecting devices directly or via one or more repeaters is sent to the trackside receiver after by the wireless mode transfer according to detecting device placement location and receiver.
As shown in Figure 1, a kind of wireless magnetic induction intensity vehicle pick-up unit comprises:
The aware space magnetic induction, and convert thereof into the magnetic induction sensor of electric signal;
The induced signal time division multiplex of spatial triaxial is become the multiplexer of serial signal;
Analog signal amplifier with above-mentioned signal power amplification;
Convert the electric signal that amplifies to digital signal by A/D, and extrapolate the magnetic induction value, and with the constant magnetic induction value in space relatively, obtain the microcontroller of testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle the transport information that obtains flow, the speed of a motor vehicle, holding time and vehicle;
With the wireless data transceiver module of testing result with the wireless mode transmission;
Wherein magnetic induction sensor, multiplexer, analog signal amplifier, microcontroller and wireless data transceiver module are connected successively, and all are connected with a power supply.Form the magnetic induction detecting device by magnetic induction sensor, multiplexer, analog signal amplifier, microcontroller, wireless data transceiver module and power supply.
Wherein said magnetic induction detecting device is a plurality of, and each magnetic induction detecting device also comprises a wireless data transceiver module that is connected with power supply with microcontroller, described wireless data transceiver module and the trackside receiver wireless connections with wireless data transceiver module.Described trackside receiver comprises microprocessor and the wireless data transceiver module that is electrically connected with it, local data interface module, data memory module and mobile communication module, and each several part connects same power supply.
Described wireless magnetic induction intensity vehicle pick-up unit also comprises repeater.According to detecting device placement location and receiver apart from distance, the testing result of described magnetic induction detecting device directly or by repeater is sent to the trackside receiver with wireless mode, and described repeater comprises microprocessor, wireless data transceiver module and the power supply of mutual electrical connection.
As shown in Figure 2, the wireless magnetic induction intensity vehicle pick-up unit is made up of magnetic induction detecting device, repeater and receiver,
The magnetic induction detecting device by: magnetic induction sensor 1, multiplexer 2, analog signal amplifier 3, microcontroller 4, wireless data transceiver module 5, on-off circuit module 6, battery 7, form.
Repeater by data memory module by: microprocessor 8, wireless data transceiver module 9, and power supply 10 form.
The trackside receiver by: cellular mobile communication module 11, microprocessor 12, wireless data transceiver module 13, data memory module 14, local data interface module 15 and power supply 16 are formed.
The stable any position that is present in the face of land of the magnetic line of force that the terrestrial magnetic field produces, the influence that not changed by natural conditions such as sunshine, weather, but can change because of iron content, nickel, cobalt etc. have entering of ferromagnetic material.Parts such as vehicle chassis contain the large tracts of land ferromagnetic material, can produce tangible influence to the ground magnetic induction on its areal coverage face of land.By the variation of aware space magnetic induction, can obtain to enrich careful information of vehicles.1 effect of magnetic induction sensor is that the variation of space magnetic induction is converted to electric signal, adopts HMC1052L type magnetic induction sensor production among the embodiment, also can adopt other magnetic induction sensor.Respectively adopt independently sensor in three dimensions X, Y, Z-direction, process multiplexer 2 becomes serial signal with three induced signal time division multiplex, adopts the multiplexed production of integrated circuits of MAX4618 type.Analog signal amplifier 3 amplifies signal power, adopts INA122 type production of integrated circuits.
The variation of resistivity causes the variation of the external output voltage of magnetoresistance material.Microcontroller 4 (MCU) is extrapolated the magnetic induction value by modulus sampling and conversion to the magnetoresistance material output voltage.Do not having vehicle through out-of-date, the magnetic field of MCU perception is a certain steady state value.The passing through of vehicle caused the variation of magnetic induction around the sensor, the magnetic induction value constant with the space compares, surpass a certain threshold value or be lower than a certain threshold value, thereby MCU can be by judging the process of vehicle to the perception in magnetic field as the foundation of judging that vehicle has or not.Sampled signal is carried out the advanced signal processing can obtain various transport information such as flow, the speed of a motor vehicle, holding time and vehicle.Controller is communicated by letter by wireless data transceiver module 5 testing result with other hardware cell, send the testing result of oneself, and accept the control signal that other hardware cell sends.The controller output command is controlled switch circuit module 6 simultaneously.The effect of on-off circuit module 6 is break-makes of control magnetic induction sensor 1 and analog signal amplifier 3 power supplys, cuts off its power supply when not needing its work, thereby reduces its power consumption.The circuit control module adopts TPS279730 and TPS78230 type production of integrated circuits.Power supply 7 adopts lithium battery.
Digital signal to each magnetic induction of collecting in the microcontroller 4 is carried out signal Processing, can obtain parameters such as vehicle detection beginning and ending time stamp, vehicle flowrate, the speed of a motor vehicle, vehicle and holding time.These data are exported to wireless data transceiver module by MCU, are sent to the space through radio circuit.Microcontroller 4 adopts MSP430F149 type production of integrated circuits among the embodiment; Wireless data transceiver module all adopts the CC2520 type production of integrated circuits of TI, and less radio-frequency adopts ceramic antenna.Detector housing adopts high impact-resistant polycarbonate (Bayer high impact polycarbonate), guarantees the transmission of wireless signal.The design of waterproof pressure-resistance structure guarantees the circuit reliably working in burial ground inside of following time.The encapsulant that pours into during floor mounted adopts organic silicon polyurea ester (epoxy, two-component 100% solid silicone polyurea-based).
Magnetic induction detecting device, repeater and trackside receiver are communicated by letter wirelessly.Testing result directly is sent to receiver by detecting device, also can be sent to repeater and be forwarded to receiver again.Repeater is sent to receiver in the mode of one or more levels relay with testing result.Wherein the microprocessor in the repeater 8 adopts MSP430F149 type production of integrated circuits, and wireless data transceiver module 9 adopts the CC2520 type production of integrated circuits of TI.Power supply 10 adopts solar powered, in local wired power supply of adopting with good conditionsi.
The trackside receiver is responsible for receiving direct by check point with by the next testing result of repeater forwarding, supports the local storage of testing result as required, exports or be sent to cellular mobile communication networks by hardware interface.Data are at first received by wireless data transceiver module 13, store respectively or export with given data layout through microprocessor processes again.Wherein wireless data transceiver module 13 adopts the CC2520 type production of integrated circuits of TI, and less radio-frequency adopts directional antenna.Microprocessor 12 adopts Coldfire model production of integrated circuits.Cellular mobile communication module 11 adopts the defeated module making of the ECI-CC12 type wireless data sending that meets the CDMA1X standard.Data storage 14 modules adopt the portable hard drive of band USB interface to make.Local data interface 15 adopts the universal integrated circuit that meets RS232, RJ45 and NEMA standard to make.Power supply 16 adopts solar powered, in local wired power supply of adopting with good conditionsi.
Claims (9)
1. a wireless magnetic induction intensity vehicle detection method is characterized in that, comprises the steps:
A. aware space magnetic induction, and convert thereof into electric signal;
B. the electric signal of step a is issued with serial and transmitted at that time and amplify;
C. the electric signal with step b converts digital signal to by A/D, and extrapolates the magnetic induction value;
D. the constant magnetic induction value in magnetic induction value that step c is obtained and space compares, obtain testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle transport information such as obtaining flow, the speed of a motor vehicle, holding time and vehicle;
E. the testing result with steps d is sent to information center by wireless mode.
2. wireless magnetic induction intensity vehicle detection method according to claim 1, it is characterized in that: a plurality of magnetic induction detecting devices are set on the road surface, each magnetic induction detecting device carries out the operation of step a to steps d, the testing result that each magnetic induction detecting device obtains is sent to the trackside receiver by wireless mode, and this trackside receiver carries out data storage, data download and data transmission to information center.
3. wireless magnetic induction intensity vehicle detection method according to claim 2, it is characterized in that: according to detecting device placement location and receiver apart from distance, the testing result of described a plurality of magnetic induction detecting devices by wireless mode directly or via being sent to the trackside receiver after one or more repeater transfer.
4. a wireless magnetic induction intensity vehicle pick-up unit is characterized in that, comprising:
The aware space magnetic induction, and convert thereof into the magnetic induction sensor of electric signal;
The induced signal time division multiplex of spatial triaxial is become the multiplexer of serial signal;
Analog signal amplifier with above-mentioned signal power amplification;
Convert the electric signal that amplifies to digital signal by A/D, and extrapolate the magnetic induction value, and with the constant magnetic induction value in space relatively, obtain the microcontroller of testing result, wherein, have or not vehicle according to surpassing a certain threshold value or being lower than a certain threshold decision, and sampled signal is carried out advanced signal handle the transport information that obtains flow, the speed of a motor vehicle, holding time and vehicle;
With the wireless data transceiver module of testing result with the wireless mode transmission;
Wherein magnetic induction sensor, multiplexer, analog signal amplifier, microcontroller and wireless data transceiver module are connected successively, and all are connected with a power supply.Form the magnetic induction detecting device jointly by magnetic induction sensor, multiplexer, analog signal amplifier, microcontroller, wireless data transceiver module and power supply.
5. wireless magnetic induction intensity vehicle pick-up unit according to claim 4, it is characterized in that, wherein said magnetic induction detecting device is a plurality of, each magnetic induction detecting device also comprises the wireless data transceiver module that is connected with power supply with microcontroller, described wireless data transceiver module and trackside receiver wireless connections with wireless data transceiver module, described trackside receiver comprises microprocessor and the wireless data transceiver module that is electrically connected with it, local data interface module, data memory module and mobile communication module, and each several part connects same power supply.
6. wireless magnetic induction intensity vehicle pick-up unit according to claim 4, it is characterized in that, described wireless magnetic induction intensity vehicle pick-up unit also comprises repeater, according to detecting device placement location and receiver apart from distance, the testing result of described magnetic induction detecting device directly or by repeater is sent to the trackside receiver with wireless mode, and described repeater comprises microprocessor, wireless data transceiver module and the power supply of mutual electrical connection.
7. wireless magnetic induction intensity vehicle pick-up unit according to claim 4 is characterized in that, described magnetic induction detecting device has the shell of a sealing.
8. wireless magnetic induction intensity vehicle pick-up unit according to claim 7 is characterized in that, described shell adopts the high impact-resistant polycarbonate to make.
9. wireless magnetic induction intensity vehicle pick-up unit according to claim 4, it is characterized in that, described magnetic induction detecting device also comprises an on-off circuit module, and described on-off circuit module connects power output end, and is connected with microcontroller with magnetic induction sensor, signal imitation amplifier.
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