CN102542809A - Method and system for detecting traffic information, and magnetic sensitive sensor nodes - Google Patents
Method and system for detecting traffic information, and magnetic sensitive sensor nodes Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting traffic information, and magnetic sensitive sensor nodes. The method is applied to the system comprising two magnetic sensitive sensor nodes and a base station. The two magnetic sensitive sensor nodes are arranged in the direction parallel to a lane at intervals. The method comprises the following steps of: filtering and amplifying a magnetic sensitive sensing signal acquired by each magnetic sensitive sensor node; when a vehicle passes by the magnetic sensitive sensor node, sampling the filtered and amplified magnetic sensitive sensing signal to acquire a sampled signal comprising pass-by moment information of the vehicle; running a digital signal processing algorithm to remove interference from the sampled signal so as to acquire a traffic information eigenvalue; and transmitting the traffic information eigenvalue to the base station, so that the base station detects the traffic information according to the traffic information eigenvalue. By the method and the system, the magnetic sensitive sensor nodes are arranged and communicate with the base station, so that the traffic information is detected; and the system has a simple structure, and a road surface is slightly damaged, so the system is convenient to construct and maintain.
Description
Technical field
The application relates to traffic detection technique field, particularly relates to a kind of traffic information detection method, system and magneto-dependent sensor node.
Background technology
The imbalance of urban highway traffic supply and demand at present becomes the serious problems that each city faces jointly gradually, and the pressure of urban transportation is heavy day by day, has seriously restricted the economic development in city.Therefore can improve this problem through the development intelligent transport technology, wherein guarantee the collection of basic traffic data accurately, be the key of intelligent transportation like speed, flow etc.
When carrying out traffic information collection, below the road surface, bury ground induction coil usually underground in the prior art, the machines motor-car through the time coil surrounding magnetic field variation obtain information of vehicles.But, because ground induction coil is bulky, need cut the road surface during embedding ground induction coil, and the serviceable life of ground induction coil is short, maintenance cost is high; In order to communicate with control end, the lead-in wire of also need slotting carries out complicated construction simultaneously, and road pavement damages thus, has influenced the serviceable life in track.In addition, existing transport information detection means also comprises video monitoring, microwave radar detection etc., but above-mentioned these detection methods all have the cost of equipment maintenance height, safeguard inconvenience, and are vulnerable to environmental impact, the defective of system stability difference.
Summary of the invention
The application embodiment provides a kind of traffic information detection method and system, and complicated to solve existing transport information detection mode construction, road pavement is destroyed bigger, and the high problem of maintenance cost.
In order to solve the problems of the technologies described above, the application embodiment discloses following technical scheme:
A kind of traffic information detection method is applied to comprise at least that in the system of two magneto-dependent sensor nodes and a base station, said two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval, and said method comprises:
The magnetosensitive transducing signal that said magneto-dependent sensor node is obtained carries out the filtering amplification;
When vehicle crossed said magneto-dependent sensor node, the magnetosensitive transducing signal after said filtering amplified was sampled, and obtained to comprise the sampled signal of the time information that vehicle crosses;
The operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
Vehicle also comprises before crossing said magneto-dependent sensor node:
After the magneto-dependent sensor node powers on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filtering amplification module in the said magneto-dependent sensor node of initialization;
The magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronization order of said base station broadcast, and carries out clock synchronization according to said clock synchronization order.
Also comprise:
The magneto-dependent sensor node is opened the node timer, and the time-count cycle of said node timer is less than the time-count cycle of the base station timer that is provided with in the said base station;
Close said radio-frequency module, make said one-chip computer module get into sleep state;
When said node timer arrives time-count cycle, open said radio-frequency module, return the clock synchronization order of carrying out said reception base station broadcast.
Saidly the magnetosensitive transducing signal is carried out filtering amplify and to be specially: through the amplifying circuit in the said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal is carried out filtering and amplify;
Said the magnetosensitive transducing signal is carried out filtering and amplifies after, also comprise:
Magnetosensitive transducing signal after the said amplification is imported the comparator circuit in the said filtering amplification module, production burst signal;
Said pulse signal is imported the I/O interface of said one-chip computer module, make said one-chip computer module get into duty, and open said radio-frequency module;
Said magnetosensitive transducing signal after the said filtering amplification is sampled is specially: the magnetosensitive transducing signal after through the digital to analog converter in the said one-chip computer module said filtering being amplified is sampled.
Said transport information the detection according to said sampled signal comprises: vehicle speed is detected, vehicle flowrate is detected, vehicle heading is detected or lane occupancy is detected.
A kind of transport information detection system comprises: at least two magneto-dependent sensor nodes and a base station, and said two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval, wherein,
Said magneto-dependent sensor node; Be used for that the magnetosensitive transducing signal that obtains is carried out filtering and amplify, when vehicle crossed said magneto-dependent sensor node, the magnetosensitive transducing signal after said filtering amplified was sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses; The operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert, and said transport information eigenwert is transferred to said base station;
Said base station is used for according to said transport information eigenwert transport information being detected.
Said magneto-dependent sensor node comprises: one-chip computer module, radio-frequency module, magneto-dependent sensor module and filtering amplification module;
Said magneto-dependent sensor node; Also be used for after powering on, the said one-chip computer module of initialization, radio-frequency module, magneto-dependent sensor module and filtering amplification module are opened said radio-frequency module; Receive the clock synchronization order of said base station broadcast, and carry out clock synchronization according to said clock synchronization order.
Said magneto-dependent sensor node; Also be used to open the node timer, close said radio-frequency module less than the time-count cycle of the base station timer that is provided with in the said base station time-count cycle of said node timer; Make said one-chip computer module get into sleep state; When said node timer arrives time-count cycle, open said radio-frequency module, return the clock synchronization order of carrying out said reception base station broadcast.
Comprise in the said filtering amplification module: amplifying circuit, block isolating circuit and comparator circuit,
Said magneto-dependent sensor node specifically is used for through the amplifying circuit of said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal being carried out the filtering amplification;
Said magneto-dependent sensor node; Also be used for the magnetosensitive transducing signal after the said amplification is imported the comparator circuit of said filtering amplification module; The production burst signal; Said pulse signal is imported the I/O interface of said single-chip microcomputer, make said one-chip computer module get into duty, and open said radio-frequency module;
Said magneto-dependent sensor node, the magnetosensitive transducing signal after specifically being used for through the digital to analog converter in the said one-chip computer module said filtering being amplified is sampled.
Said base station specifically is used for according to said sampled signal vehicle speed, vehicle flowrate, vehicle heading or lane occupancy being detected.
A kind of magneto-dependent sensor node comprises: magneto-dependent sensor module, filtering amplification module, one-chip computer module and radio-frequency module,
Said magneto-dependent sensor module is used to obtain the magnetosensitive transducing signal;
Said filtering amplification module is used for that said magnetosensitive transducing signal is carried out filtering and amplifies;
Said one-chip computer module; Be used for when vehicle crosses said magneto-dependent sensor node; Magnetosensitive transducing signal to after the said filtering amplification is sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said radio-frequency module is used for said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
Also comprise:
Initialization module, after being used for the magneto-dependent sensor node and powering on, the said one-chip computer module of initialization, radio-frequency module, magneto-dependent sensor module and filtering amplification module;
Said radio-frequency module also is used for after unlatching, receiving the clock synchronization order of said base station broadcast, and carries out clock synchronization according to said clock synchronization order.
Also comprise:
Timer module is used to open the node timer, and the time-count cycle of said node timer is less than the time-count cycle of the base station timer that is provided with in the said base station;
Said radio-frequency module also is used for after opening said node timer, closing, and makes said one-chip computer module get into sleep state, and when said node timer arrives time-count cycle, opens, and returns the clock synchronization order of carrying out said reception base station broadcast.
The filtering amplification module comprises: amplifying circuit, separated straight filtering circuit and comparator circuit,
Said filtering amplification module specifically is used for through the amplifying circuit of said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal being carried out the filtering amplification;
Said filtering amplification module; Also be used for the magnetosensitive transducing signal after the said amplification is imported the comparator circuit of said filtering amplification module; The production burst signal is imported the I/O interface of said single-chip microcomputer with said pulse signal, makes said one-chip computer module get into duty;
Said radio-frequency module also is used for after said one-chip computer module gets into duty, opening;
Said one-chip computer module, the magnetosensitive transducing signal after specifically being used for through digital to analog converter said filtering being amplified is sampled.
Can be found out that by the foregoing description the application embodiment comprises two magneto-dependent sensor nodes and a base station at least, wherein two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval; The magnetosensitive transducing signal that the magneto-dependent sensor node is obtained carries out the filtering amplification; When vehicle crossed the magneto-dependent sensor node, the magnetosensitive transducing signal after filtering amplified was sampled, and obtained to comprise the sampled signal of the time information that vehicle crosses; The operation digital signal processing algorithm is removed the interference in the sampled signal; Obtain the transport information eigenwert, the transport information eigenwert is transferred to the base station, so that the base station is detected transport information according to the transport information eigenwert.The application embodiment communicates through magneto-dependent sensor node and base station are set, and realizes that transport information detects, because system architecture is simple, road pavement is destroyed little, so easy construction, is convenient to safeguard; And through timer cycle property is set closes, open the sampling function and the radio-frequency module of one-chip computer module, can reduce the power consumption of system, the system that makes can long-play, and transport information is detected.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously; For those of ordinary skills, under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Figure 1A is the first embodiment process flow diagram of the application's traffic information detection method;
Figure 1B is two magneto-dependent sensor nodes and the structural representation that the base station communicates;
Fig. 2 A is the second embodiment process flow diagram of the application's traffic information detection method;
Fig. 2 B is the structural representation that the base station is detected the transport information on the single track;
Fig. 2 C is the structural representation that the base station is detected the transport information on the section of track;
Fig. 2 D is the magnetosensitive transducing signal synoptic diagram of vehicle when not crossing the magneto-dependent sensor node;
Fig. 2 E is the magnetosensitive transducing signal synoptic diagram of vehicle when crossing the magneto-dependent sensor node;
Fig. 3 is the embodiment block diagram of the application's transport information detection system;
Fig. 4 is the application's magneto-dependent sensor node first embodiment block diagram;
Fig. 5 is the application's magneto-dependent sensor node second embodiment block diagram.
Embodiment
The following embodiment of the present invention provides a kind of traffic information detection method, system and magneto-dependent sensor node.Carrying out transport information when detecting, need two magneto-dependent sensor nodes and a base station at least, wherein the magneto-dependent sensor node is parallel to the track direction and is provided with at interval.
In order to make those skilled in the art person understand the technical scheme in the embodiment of the invention better; And make the above-mentioned purpose of the embodiment of the invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing technical scheme in the embodiment of the invention done further detailed explanation.
Referring to Figure 1A, be the first embodiment process flow diagram of the application's traffic information detection method:
Step 101: the magneto-dependent sensor node obtains the magnetosensitive transducing signal.
Among the application embodiment, on the direction parallel, the magneto-dependent sensor node is set, in the other control box in track, places base station with the magneto-dependent sensor node communication according to certain intervals of lengths with the track.Wherein, the magneto-dependent sensor node can be made up of magneto-dependent sensor module, filtering amplification module, one-chip computer module and radio-frequency module; The base station can be made up of one-chip computer module and radio-frequency module.Further, the filtering amplification module can comprise amplifying circuit, separated straight filtering circuit and comparator circuit.
Referring to Figure 1B, be two magneto-dependent sensor nodes and the structural representation that the base station communicates, wherein, preferably be provided with between two magneto-dependent sensor nodes with 2 meters intervals.
Step 102: the magnetosensitive transducing signal is carried out filtering amplify.
Wherein, through the amplifying circuit in the filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal is carried out the filtering amplification.After the magnetosensitive transducing signal amplifies through filtering, can import digital to analog converter (ADC) interface of one-chip computer module, supply one-chip computer module to sample; Further; Magnetosensitive transducing signal after also can filtering being amplified is divided into two paths of signals, and wherein one road signal inserts digital to analog converter (ADC) interface of one-chip computer module, supplies one-chip computer module to sample; Another road signal can insert the input end of comparator circuit; The output terminal of comparator circuit links to each other with the I/O interface of one-chip computer module, is used for sending pulse signal to one-chip computer module, gets into duty to trigger one-chip computer module from sleep state.
Step 103: when vehicle crossed the magneto-dependent sensor node, the magnetosensitive transducing signal after filtering amplified was sampled, and obtained to comprise the sampled signal of the time information that vehicle crosses.
Magnetosensitive transducing signal after digital to analog converter in the one-chip computer module amplifies filtering carries out the A/D sampling, and SF is preferably 1KHz.
Step 104: the operation digital signal processing algorithm is removed the interference in the sampled signal, obtains the transport information eigenwert.
Step 105: the transport information eigenwert is transferred to the base station, so that the base station is detected transport information according to the transport information eigenwert.
The detection that carry out transport information according to the transport information eigenwert base station comprises: vehicle speed is detected, vehicle flowrate is detected, vehicle heading is detected or lane occupancy is detected.
Referring to Fig. 2 A, be the second embodiment process flow diagram of the application's traffic information detection method:
Step 201: after the magneto-dependent sensor node powers on, the one-chip computer module in the initialization magneto-dependent sensor node, radio-frequency module, magneto-dependent sensor module and filtering amplification module.
When the application embodiment is applied on the track; With the track that typically comprises two tracks is example; On each track, all according to certain intervals of lengths the magneto-dependent sensor node is set respectively; The line of the magneto-dependent sensor node that is provided with on each track is parallel with the track, and is preferred, in the hole that the magneto-dependent sensor node is imbedded on the road surface to be beaten with 2 meters intervals; Simultaneously, in the other control box in track, the base station is set.Wherein, the base station can with the magneto-dependent sensor node communication in single track, realize that the transport information on the single track detects, also can with the magneto-dependent sensor node communication on all tracks, realize the traffic information collection on the section of track.Referring to Fig. 2 B, the structural representation that the transport information on the single track is detected for the base station; Referring to Fig. 2 C, the structural representation that the transport information on the section of track is detected for the base station.
Wherein, the magneto-dependent sensor node can be made up of magneto-dependent sensor module, filtering amplification module, one-chip computer module and radio-frequency module; The base station can be made up of one-chip computer module and radio-frequency module.Further, the filtering amplification module can comprise amplifying circuit, separated straight filtering circuit and comparator circuit; Can also comprise power amplification circuit in the radio-frequency module, during with assurance and base station communication, signal can transmit in certain distance.
Concrete, the one-chip computer module in the magneto-dependent sensor node can adopt 16 single-chip microcomputers as main control chip; Radio-frequency module can adopt rf chip as acp chip, and its working frequency range is preferably 433MHz; Sensor assembly can adopt the GMR sensor; One-chip computer module in the base station also can adopt 16 single-chip microcomputers as main control chip, and radio-frequency module can adopt rf chip as acp chip, and its working frequency range also is preferably 433MHz.
Step 202: the magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronization order of base station broadcast, and clock synchronization is carried out in order according to clock synchronization.
The magneto-dependent sensor node is opened radio-frequency module and base station and is communicated after the initialization of completion to each module that power on; Simultaneously, after the base station powered on and accomplishes the initialization of one-chip computer module and radio-frequency module, the base station was provided with timing cycle, and opened the base station timer and carry out timing, then through wireless channel with the mode of broadcasting to magneto-dependent sensor node tranmitting data register synch command.The magneto-dependent sensor node carries out clock synchronization according to this clock synchronization order after receiving the clock synchronization order through radio-frequency module.Carry out clock that clock synchronization can avoid each magneto-dependent sensor node because the drift of crystal oscillator and step-out improves the accuracy that transport information detects.
Step 203: the magneto-dependent sensor node is opened the node timer, and closes radio-frequency module, and the time-count cycle of this node timer is less than the time-count cycle of the base station timer that is provided with in the base station.
The magneto-dependent sensor node is closed radio-frequency module after carrying out clock synchronization, make one-chip computer module get into the sleep state of low-power consumption thus.Wherein, The time-count cycle of node timer is less than the time-count cycle of the base station timer that is provided with in the base station; So that when in the time-count cycle of base station timer, not having vehicle to cross, the magneto-dependent sensor node can wake up from sleep state, open radio-frequency module; Monitor channel is waited for receiving the clock synchronization order of sending the base station.
Step 204: one-chip computer module gets into sleep state.
Step 205: whether the decision node timer arrives time-count cycle, if then return step 202; Otherwise, execution in step 206.
Step 206: the magneto-dependent sensor node obtains the magnetosensitive transducing signal.
Referring to Fig. 2 D, the magnetosensitive transducing signal synoptic diagram when not crossing the magneto-dependent sensor node for vehicle, referring to Fig. 2 E, the magnetosensitive transducing signal synoptic diagram when crossing the magneto-dependent sensor node for vehicle.Hence one can see that, and when vehicle crossed sensor node, the fluctuation of the magnetosensitive transducing signal that is generated was bigger.
Step 207: the magnetosensitive transducing signal is carried out the filtering amplification through the amplifying circuit in the filtering amplification module with at a distance from straight filtering circuit.
Magnetosensitive transducing signal after filtering is amplified is divided into two paths of signals; Wherein one road signal inserts digital to analog converter (ADC) interface of one-chip computer module; Supply one-chip computer module to sample; Another road signal can insert the input end of comparator circuit, and the output terminal of comparator circuit links to each other with the I/O interface of one-chip computer module, is used for sending pulse signal to one-chip computer module.
Step 208: when vehicle crosses the magneto-dependent sensor node, with the comparator circuit in the magnetosensitive transducing signal input filtering amplification module after amplifying, production burst signal.
Because when vehicle crosses; The fluctuation of magnetosensitive transducing signal is bigger; Therefore will be through the amplitude of the magnetosensitive transducing signal after the amplification filtering greater than the comparator circuit preset threshold; Trigger the comparator circuit output pulse signal thus, this pulse signal is used to make one-chip computer module to get into duty from sleep state.
Step 209: pulse signal is imported the I/O interface of single-chip microcomputer, make one-chip computer module get into duty, and open radio-frequency module.
Step 210: the magnetosensitive transducing signal after through the digital to analog converter in the one-chip computer module filtering being amplified is sampled, and obtains to comprise the sampled signal of the time information that vehicle crosses.
Magnetosensitive transducing signal after digital to analog converter in the one-chip computer module amplifies filtering carries out the A/D sampling, and SF is preferably 1KHz.Can know that referring to Fig. 2 E vehicle crosses the waveform similarity of the magnetosensitive transducing signal that two magneto-dependent sensor nodes are produced, therefore can be crossed the mistiming of two sensor nodes the mistiming between two signal peaks as vehicle.In addition,, through the peak value mode of acquisition mistiming, can also adopt alternate manner obtain the mistiming, this application embodiment is not limited through the operation digital signal processing algorithm except above-mentioned for the accuracy of result of calculation.
Step 211: the operation digital signal processing algorithm is removed the interference in the sampled signal, obtains the transport information eigenwert.
In fact the transport information eigenwert is exactly in order to realize the convenient purpose that detects transport information such as the speed of a motor vehicle, travel direction, the several special time information that when vehicle process magneto-dependent sensor node, is obtained.For example; In conjunction with Fig. 2 E; These several special moment can comprise the 20% pairing moment of first crest amplitude, the 80% pairing moment of first crest amplitude, first crest moment corresponding; The maximal value moment corresponding of crest, signal are returned to moment of plateau (being that vehicle sails out of the magneto-dependent sensor node) or the like.
When carrying out value, for example, can adopt following manner of comparison according to the transport information eigenwert:
1) the magneto-dependent sensor node by periodic wakeup after, at first collect the background magnetic field strength mean value in the certain hour, the intensity level of the magnetosensitive transducing signal that arrives when subsequent acquisition is during greater than the certain threshold value of this average, then can think has vehicle to cross;
2) continue relatively; If after the maximal value that obtains a certain magnetosensitive transducing signal; Continue 10 sampled points (such as, sampling rate is under the 1KHz situation) value all not have above this maximal value, then think the moment that this maximal value and this maximal value moment corresponding are primary peak amplitude and arrival thereof;
3) continue relatively; If lasting 500 sampled points after the maximal value of a certain magnetosensitive transducing signal of acquisition (such as; Sampling rate is under the 1KHz situation) value do not surpass this maximal value, then think maximal value that maximal value and this maximal value moment corresponding are crest and arriving constantly; Need to prove that continuing sampling number relatively can adjust according to SF, and this application embodiment is not limited;
4) be lower than moment of the average of background magnetic field intensity for the first time when the intensity level of magnetosensitive transducing signal, then think the moment that vehicle has sailed out of.
Step 212: the transport information eigenwert is transferred to the base station through radio-frequency module.
One-chip computer module can obtain corresponding time data from the sampled signal after remove disturbing, and this time data is transferred to the base station after through the radio-frequency module packing.
Step 213: the base station is detected transport information according to the transport information eigenwert.
To travel speed, after the base station received time data, computing time was poor, can obtain the travel speed of vehicle divided by the mistiming through the interval between two magneto-dependent sensor nodes.
For travel direction, suppose the track south-north direction, magneto-dependent sensor node 1 is arranged on and leans on a southern side, magneto-dependent sensor node 2 to be arranged on by a northern side; Two vehicle due ins that magneto-dependent sensor reported are respectively t1, and if t2 is then t1＞t2; Judge vehicle earlier through magneto-dependent sensor node 2, travel direction is served as reasons north to south, otherwise; If t1＜t2 then judges vehicle earlier through magneto-dependent sensor node 1, travel direction is served as reasons and is reached north in the south.For different tracks direction, it is constant that it detects principle.
For traffic statistics, different time starting point and terminal point are set in the magneto-dependent sensor node, suppose start time flow zero setting constantly, before terminal point arrives constantly, whenever detect a vehicle and arrive, then flow adds 1; Constantly then can record the magnitude of traffic flow of certain hour at interval according to different starting points and terminal point, for example, the magnitude of traffic flow in 1 hour, the magnitude of traffic flow on the 1st, 1 year traffic flow, the 1 hourly average magnitude of traffic flow, the per day magnitude of traffic flow etc.
For lane occupancy ratio, be a section with single magneto-dependent sensor node, in observation time section T, each vehicle process is then moved digital signal processing algorithm, detects vehicle through the used time t of this section
i(i=1,2,3...n, n are the vehicle fleets that in observation time, passes through), the lane occupancy ratio in this observation time section calculates according to following formula so:
Corresponding with the embodiment of the application's traffic information detection method, the application also provides the embodiment of transport information detection system and magneto-dependent sensor node.
Referring to Fig. 3, be the embodiment block diagram of the application's transport information detection system:
This transport information detection system comprises at least: two magneto-dependent sensor nodes 310 and a base station 320, and convenient for example, only show two magneto-dependent sensor nodes 310 and a base station 320 among Fig. 3.Two magneto-dependent sensor nodes 310 are parallel to the track direction and are provided with at interval.
Wherein, said magneto-dependent sensor node 310 is used for that the magnetosensitive transducing signal that obtains is carried out filtering and amplifies; When vehicle crosses said magneto-dependent sensor node 310; Magnetosensitive transducing signal after said filtering amplified is sampled, and obtains to comprise the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the said sampled signal; Obtain the transport information eigenwert, said transport information eigenwert is transferred to said base station 320;
Said base station 320 is used for according to said transport information eigenwert transport information being detected.
Further, the magneto-dependent sensor node can comprise (not shown among Fig. 3): one-chip computer module, radio-frequency module, magneto-dependent sensor module and filtering amplification module; Can comprise in the filtering amplification module: amplifying circuit, block isolating circuit and comparator circuit.
Wherein, Said magneto-dependent sensor node 310; Also be used for after powering on, the said one-chip computer module of initialization, radio-frequency module, magneto-dependent sensor module and filtering amplification module are opened said radio-frequency module; Receive the clock synchronization order of said base station broadcast, and carry out clock synchronization according to said clock synchronization order.
Further, said magneto-dependent sensor node 310 also is used to open the node timer; The time-count cycle of said node timer is less than the time-count cycle of the base station timer that is provided with in the said base station 320; Close said radio-frequency module, make said one-chip computer module get into sleep state, when said node timer arrives time-count cycle; Open said radio-frequency module, return the clock synchronization order of carrying out 320 broadcasting of said reception base station.
Further, said magneto-dependent sensor node 310 specifically is used for through the amplifying circuit of said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal being carried out the filtering amplification;
Said magneto-dependent sensor node 310; Also be used for the magnetosensitive transducing signal after the said amplification is imported the comparator circuit of said filtering amplification module; The production burst signal; Said pulse signal is imported the I/O interface of said single-chip microcomputer, make said one-chip computer module get into duty, and open said radio-frequency module;
Said magneto-dependent sensor node 310, the magnetosensitive transducing signal after specifically being used for through the digital to analog converter in the said one-chip computer module said filtering being amplified is sampled.
Further, said base station 320 specifically is used for according to said sampled signal vehicle speed, vehicle flowrate, vehicle heading or lane occupancy being detected.
Referring to Fig. 4, be the application's magneto-dependent sensor node first embodiment block diagram:
This magneto-dependent sensor node comprises: magneto-dependent sensor module 410, filtering amplification module 420, one-chip computer module 430 and radio-frequency module 440.
Wherein, said magneto-dependent sensor module 410 is used to obtain the magnetosensitive transducing signal;
Said filtering amplification module 420 is used for that said magnetosensitive transducing signal is carried out filtering and amplifies;
Said one-chip computer module 430; Be used for when vehicle crosses said magneto-dependent sensor node; Magnetosensitive transducing signal to after the said filtering amplification is sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said radio-frequency module 440 is used for said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
Referring to Fig. 5, be the application's magneto-dependent sensor node second embodiment block diagram:
This dependent sensor node comprises: initialization module 510, timer module 520, magneto-dependent sensor module 530, filtering amplification module 540, one-chip computer module 550 and radio-frequency module 560.Concrete, filtering amplification module 540 can comprise (not shown among Fig. 5): amplifying circuit, separated straight filtering circuit and comparator circuit.
Wherein, initialization module 510, after being used for the magneto-dependent sensor node and powering on, the said one-chip computer module of initialization 550, radio-frequency module 560, magneto-dependent sensor module 530 and filtering amplification module 540;
Said radio-frequency module 560 is used for after unlatching, receiving the clock synchronization order of said base station broadcast, and carries out clock synchronization according to said clock synchronization order;
Said radio-frequency module 560; Also be used for after opening said node timer, closing; And make said one-chip computer module get into sleep state, and when said node timer arrives time-count cycle, open, and return the clock synchronization order of carrying out said reception base station broadcast;
Said magneto-dependent sensor module 530 is used to obtain the magnetosensitive transducing signal;
Said radio-frequency module 560 also is used for after said one-chip computer module 550 gets into duty, opening;
Said one-chip computer module 550; Be used for the magnetosensitive transducing signal after the said filtering amplification is sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said radio-frequency module 560 also is used for said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
Description through to above embodiment can be known; The application embodiment comprises two magneto-dependent sensor nodes and a base station at least; Wherein two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval, and the magnetosensitive transducing signal that the magneto-dependent sensor node is obtained carries out filtering and amplifies, when vehicle crosses the magneto-dependent sensor node; Magnetosensitive transducing signal to after the filtering amplification is sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the sampled signal, obtains the transport information eigenwert; The transport information eigenwert is transferred to the base station, so that the base station is detected transport information according to the transport information eigenwert.The application embodiment communicates through magneto-dependent sensor node and base station are set, and realizes that transport information detects, because system architecture is simple, road pavement is destroyed little, so easy construction, is convenient to safeguard; And through timer cycle property is set closes, open the sampling function and the radio-frequency module of one-chip computer module, can reduce the power consumption of system, the system that makes can long-play, and transport information is detected.
The technology that those skilled in the art can be well understood in the embodiment of the invention can realize by the mode that software adds essential general hardware platform.Based on such understanding; The part that technical scheme in the embodiment of the invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product can be stored in the storage medium, like ROM/RAM, magnetic disc, CD etc., comprises that some instructions are with so that a computer equipment (can be a personal computer; Server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses all is the difference with other embodiment.Especially, for system embodiment, because it is basically similar in appearance to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a traffic information detection method is characterized in that, is applied to comprise at least that in the system of two magneto-dependent sensor nodes and a base station, said two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval, and said method comprises:
The magnetosensitive transducing signal that said magneto-dependent sensor node is obtained carries out the filtering amplification;
When vehicle crossed said magneto-dependent sensor node, the magnetosensitive transducing signal after said filtering amplified was sampled, and obtained to comprise the sampled signal of the time information that vehicle crosses;
The operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
2. method according to claim 1 is characterized in that, before the magnetosensitive transducing signal that said magneto-dependent sensor node is obtained carries out filtering and amplifies, also comprises:
After the magneto-dependent sensor node powers on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filtering amplification module in the said magneto-dependent sensor node of initialization;
The magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronization order of said base station broadcast, and carries out clock synchronization according to said clock synchronization order.
3. method according to claim 2 is characterized in that, also comprises:
The magneto-dependent sensor node is opened the node timer, and the time-count cycle of said node timer is less than the time-count cycle of the base station timer that is provided with in the said base station;
Close said radio-frequency module, make said one-chip computer module get into sleep state;
When said node timer arrives time-count cycle, open said radio-frequency module, return the clock synchronization order of carrying out said reception base station broadcast.
4. method according to claim 3 is characterized in that, saidly the magnetosensitive transducing signal is carried out filtering amplifies and to be specially: through the amplifying circuit in the said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal is carried out filtering and amplify;
Said the magnetosensitive transducing signal is carried out filtering and amplifies after, also comprise:
Magnetosensitive transducing signal after the said amplification is imported the comparator circuit in the said filtering amplification module, production burst signal;
Said pulse signal is imported the I/O interface of said one-chip computer module, make said one-chip computer module get into duty, and open said radio-frequency module;
Said magnetosensitive transducing signal after the said filtering amplification is sampled is specially: the magnetosensitive transducing signal after through the digital to analog converter in the said one-chip computer module said filtering being amplified is sampled.
5. method according to claim 1; It is characterized in that said transport information the detection according to said sampled signal comprises: vehicle speed is detected, vehicle flowrate is detected, vehicle heading is detected or lane occupancy is detected.
6. a transport information detection system is characterized in that, comprising: at least two magneto-dependent sensor nodes and a base station, and said two magneto-dependent sensor nodes are parallel to the track direction and are provided with at interval, wherein,
Said magneto-dependent sensor node; Be used for that the magnetosensitive transducing signal that obtains is carried out filtering and amplify, when vehicle crossed said magneto-dependent sensor node, the magnetosensitive transducing signal after said filtering amplified was sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses; The operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert, and said transport information eigenwert is transferred to said base station;
Said base station is used for according to said transport information eigenwert transport information being detected.
7. system according to claim 6 is characterized in that, said magneto-dependent sensor node comprises: one-chip computer module, radio-frequency module, magneto-dependent sensor module and filtering amplification module;
Said magneto-dependent sensor node; Also be used for after powering on, the said one-chip computer module of initialization, radio-frequency module, magneto-dependent sensor module and filtering amplification module are opened said radio-frequency module; Receive the clock synchronization order of said base station broadcast, and carry out clock synchronization according to said clock synchronization order.
8. system according to claim 7 is characterized in that, said magneto-dependent sensor node; Also be used to open the node timer, close said radio-frequency module less than the time-count cycle of the base station timer that is provided with in the said base station time-count cycle of said node timer; Make said one-chip computer module get into sleep state; When said node timer arrives time-count cycle, open said radio-frequency module, return the clock synchronization order of carrying out said reception base station broadcast.
9. system according to claim 8 is characterized in that, comprises in the said filtering amplification module: amplifying circuit, block isolating circuit and comparator circuit,
Said magneto-dependent sensor node specifically is used for through the amplifying circuit of said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal being carried out the filtering amplification;
Said magneto-dependent sensor node; Also be used for the magnetosensitive transducing signal after the said amplification is imported the comparator circuit of said filtering amplification module; The production burst signal; Said pulse signal is imported the I/O interface of said single-chip microcomputer, make said one-chip computer module get into duty, and open said radio-frequency module;
Said magneto-dependent sensor node, the magnetosensitive transducing signal after specifically being used for through the digital to analog converter in the said one-chip computer module said filtering being amplified is sampled.
10. system according to claim 6 is characterized in that, said base station specifically is used for according to said sampled signal vehicle speed, vehicle flowrate, vehicle heading or lane occupancy being detected.
11. a magneto-dependent sensor node is characterized in that, comprising: magneto-dependent sensor module, filtering amplification module, one-chip computer module and radio-frequency module,
Said magneto-dependent sensor module is used to obtain the magnetosensitive transducing signal;
Said filtering amplification module is used for that said magnetosensitive transducing signal is carried out filtering and amplifies;
Said one-chip computer module; Be used for when vehicle crosses said magneto-dependent sensor node; Magnetosensitive transducing signal to after the said filtering amplification is sampled; Acquisition comprises the sampled signal of the time information that vehicle crosses, and the operation digital signal processing algorithm is removed the interference in the said sampled signal, obtains the transport information eigenwert;
Said radio-frequency module is used for said transport information eigenwert is transferred to said base station, so that said base station is detected transport information according to said transport information eigenwert.
12. magneto-dependent sensor node according to claim 11 is characterized in that, also comprises:
Initialization module, after being used for the magneto-dependent sensor node and powering on, the said one-chip computer module of initialization, radio-frequency module, magneto-dependent sensor module and filtering amplification module;
Said radio-frequency module also is used for after unlatching, receiving the clock synchronization order of said base station broadcast, and carries out clock synchronization according to said clock synchronization order.
13. magneto-dependent sensor node according to claim 12 is characterized in that, also comprises:
Timer module is used to open the node timer, and the time-count cycle of said node timer is less than the time-count cycle of the base station timer that is provided with in the said base station;
Said radio-frequency module also is used for after opening said node timer, closing, and makes said one-chip computer module get into sleep state, and when said node timer arrives time-count cycle, opens, and returns the clock synchronization order of carrying out said reception base station broadcast.
14. magneto-dependent sensor module according to claim 13 is characterized in that, the filtering amplification module comprises: amplifying circuit, separated straight filtering circuit and comparator circuit,
Said filtering amplification module specifically is used for through the amplifying circuit of said filtering amplification module with at a distance from straight filtering circuit said magnetosensitive transducing signal being carried out the filtering amplification;
Said filtering amplification module; Also be used for the magnetosensitive transducing signal after the said amplification is imported the comparator circuit of said filtering amplification module; The production burst signal is imported the I/O interface of said single-chip microcomputer with said pulse signal, makes said one-chip computer module get into duty;
Said radio-frequency module also is used for after said one-chip computer module gets into duty, opening;
Said one-chip computer module, the magnetosensitive transducing signal after specifically being used for through digital to analog converter said filtering being amplified is sampled.
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