CN102542809B - 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 of each city facing gradually, and the pressure of urban transportation is day by day heavy, has seriously restricted the economic development in city.Therefore can improve this problem by development intelligent transport technology, wherein guarantee the collection of basic traffic data accurately, if speed, flow etc. are the keys of intelligent transportation.
In prior art, in the time carrying out traffic information collection, conventionally below road surface, bury ground induction coil underground, detect motor vehicle by time coil surrounding magnetic field variation obtain information of vehicles.But, because ground induction coil is bulky, when embedding ground induction coil, need to cut road surface, and the serviceable life of ground induction coil is short, maintenance cost is high; In order communicating with control end, also to need fluting lead-in wire simultaneously, to carry out complicated construction, road pavement damages thus, has affected the serviceable life in track.In addition, existing transport information detection means also comprises video monitoring, microwave radar detection etc., but that above-mentioned these detection methods all have cost of equipment maintenance is high, safeguards inconvenience, and is vulnerable to environmental impact, the defect that system stability is poor.
Summary of the invention
The embodiment of the present application provides a kind of traffic information detection method and system, and complicated to solve existing transport information detection mode construction, road pavement is destroyed larger, and the high problem of maintenance cost.
In order to solve the problems of the technologies described above, the embodiment of the present application discloses following technical scheme:
A kind of traffic information detection method, is applied in the system that at least comprises two magneto-dependent sensor nodes and a base station, and described two magneto-dependent sensor nodes are parallel to direction interval, track and arrange, and described method comprises:
The magnetosensitive transducing signal that described magneto-dependent sensor node is obtained carries out filter and amplification;
In the time that vehicle crosses described magneto-dependent sensor node, the magnetosensitive transducing signal after described filter and amplification is sampled, obtain the sampled signal that comprises the time information that vehicle crosses;
Operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described transport information eigenwert is transferred to described base station, so that described base station is detected transport information according to described transport information eigenwert.
Vehicle crosses before described magneto-dependent sensor node, also comprises:
After magneto-dependent sensor node powers on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module described in initialization in magneto-dependent sensor node;
Magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronous order of described base station broadcast, and carries out clock synchronous according to described clock synchronous order.
Also comprise:
Magneto-dependent sensor node is opened node timer, is less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer;
Close described radio-frequency module, make described one-chip computer module enter sleep state;
In the time that described node timer arrives time-count cycle, open described radio-frequency module, return to the clock synchronous order of carrying out described reception base station broadcast.
Describedly magnetosensitive transducing signal is carried out to filter and amplification be specially: by the amplifying circuit in described filter and amplification module with every straight filtering circuit, described magnetosensitive transducing signal is carried out to filter and amplification;
Described magnetosensitive transducing signal is carried out, after filter and amplification, also comprising:
Magnetosensitive transducing signal after described amplification is inputted to the comparator circuit in described filter and amplification module, production burst signal;
Described pulse signal is inputted to the I/O interface of described one-chip computer module, made described one-chip computer module enter duty, and open described radio-frequency module;
Described magnetosensitive transducing signal after described filter and amplification is sampled and is specially: the magnetosensitive transducing signal by the digital to analog converter in described one-chip computer module after to described filter and amplification is sampled.
Describedly according to described sampled signal, transport information is detected and comprised: vehicle speed is detected, vehicle flowrate is detected, vehicle heading is detected or lane occupancy is detected.
A kind of transport information detection system, comprising: at least two magneto-dependent sensor nodes and a base station, and described two magneto-dependent sensor nodes are parallel to direction interval, track and arrange, wherein,
Described magneto-dependent sensor node, for the magnetosensitive transducing signal of acquisition is carried out to filter and amplification, in the time that vehicle crosses described magneto-dependent sensor node, magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert, and described transport information eigenwert is transferred to described base station;
Described base station, for detecting transport information according to described transport information eigenwert.
Described magneto-dependent sensor node comprises: one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module;
Described magneto-dependent sensor node, also for after powering on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module, open described radio-frequency module described in initialization, receive the clock synchronous order of described base station broadcast, and carry out clock synchronous according to described clock synchronous order.
Described magneto-dependent sensor node, also for opening node timer, be less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer, close described radio-frequency module, make described one-chip computer module enter sleep state, in the time that described node timer arrives time-count cycle, open described radio-frequency module, return to the clock synchronous order of carrying out described reception base station broadcast.
Described filter and amplification module comprises: amplifying circuit, block isolating circuit and comparator circuit,
Described magneto-dependent sensor node, carries out filter and amplification specifically for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal;
Described magneto-dependent sensor node, also for the magnetosensitive transducing signal after described amplification being inputted to the comparator circuit of described filter and amplification module, production burst signal, described pulse signal is inputted to the I/O interface of described single-chip microcomputer, make described one-chip computer module enter duty, and open described radio-frequency module;
Described magneto-dependent sensor node, the magnetosensitive transducing signal specifically for the digital to analog converter by described one-chip computer module after to described filter and amplification is sampled.
Described base station, specifically for detecting vehicle speed, vehicle flowrate, vehicle heading or lane occupancy according to described sampled signal.
A kind of magneto-dependent sensor node, comprising: magneto-dependent sensor module, filter and amplification module, one-chip computer module and radio-frequency module,
Described magneto-dependent sensor module, for obtaining magnetosensitive transducing signal;
Described filter and amplification module, for carrying out filter and amplification by described magnetosensitive transducing signal;
Described one-chip computer module, for in the time that vehicle crosses described magneto-dependent sensor node, magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described radio-frequency module, for described transport information eigenwert is transferred to described base station, so that described base station is detected transport information according to described transport information eigenwert.
Also comprise:
Initialization module, after powering on for magneto-dependent sensor node, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module described in initialization;
Described radio-frequency module, also for receive afterwards the clock synchronous order of described base station broadcast in unlatching, and carries out clock synchronous according to described clock synchronous order.
Also comprise:
Timer module, for opening node timer, is less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer;
Described radio-frequency module, also for closing after the described node timer of unlatching, and makes described one-chip computer module enter sleep state, and opens in the time that described node timer arrives time-count cycle, and return to the clock synchronous order of carrying out described reception base station broadcast.
Filter and amplification module comprises: amplifying circuit, every straight filtering circuit and comparator circuit,
Described filter and amplification module, carries out filter and amplification specifically for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal;
Described filter and amplification module, also for the magnetosensitive transducing signal after described amplification being inputted to the comparator circuit of described filter and amplification module, production burst signal, inputs described pulse signal the I/O interface of described single-chip microcomputer, makes described one-chip computer module enter duty;
Described radio-frequency module is also opened after entering duty at described one-chip computer module;
Described one-chip computer module, specifically for by digital to analog converter the magnetosensitive transducing signal after to described filter and amplification sample.
As can be seen from the above-described embodiment, the embodiment of the present application at least comprises two magneto-dependent sensor nodes and a base station, wherein two magneto-dependent sensor nodes are parallel to the setting of direction interval, track, the magnetosensitive transducing signal that magneto-dependent sensor node is obtained carries out filter and amplification, in the time that vehicle crosses magneto-dependent sensor node, magnetosensitive transducing signal after filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in sampled signal, obtain transport information eigenwert, transport information eigenwert is transferred to base station, so that base station is detected transport information according to transport information eigenwert.The embodiment of the present application communicates by magneto-dependent sensor node and base station are set, and realizes transport information and detects, and because system architecture is simple, road pavement is destroyed little, and therefore easy construction is convenient to safeguard; And periodically close, open sampling functions and the radio-frequency module of one-chip computer module by timer is set, can reduce the power consumption of system, make the system can long-play, transport information is detected.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 a structural representation that 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 base station is detected the transport information on single track;
Fig. 2 C is the structural representation that base station is detected the transport information on the section of track;
Fig. 2 D is the magnetosensitive transducing signal schematic diagram of vehicles failed while crossing magneto-dependent sensor node;
Fig. 2 E is the magnetosensitive transducing signal schematic diagram of vehicle while crossing 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 the first embodiment block diagram;
Fig. 5 is the application's magneto-dependent sensor node the 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.In the time carrying out transport information detection, at least need two magneto-dependent sensor nodes and a base station, wherein magneto-dependent sensor node is parallel to the setting of direction interval, track.
In order to make those skilled in the art person understand better the technical scheme in the embodiment of the present invention, and the above-mentioned purpose of the embodiment of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present invention is described in further detail.
Referring to Figure 1A, the first embodiment process flow diagram for the application's traffic information detection method:
Step 101: magneto-dependent sensor node obtains magnetosensitive transducing signal.
In the embodiment of the present application, in the direction parallel with track, according to certain length interval, magneto-dependent sensor node is set, in the other control box in track, places the base station with magneto-dependent sensor node communication.Wherein, magneto-dependent sensor node can be made up of magneto-dependent sensor module, filter and amplification module, one-chip computer module and radio-frequency module; Base station can be made up of one-chip computer module and radio-frequency module.Further, filter and amplification module can comprise amplifying circuit, every straight filtering circuit and comparator circuit.
Referring to Figure 1B, be two magneto-dependent sensor nodes and a structural representation that base station communicates, wherein, between two magneto-dependent sensor nodes, preferably arrange with 2 meters of intervals.
Step 102: magnetosensitive transducing signal is carried out to filter and amplification.
Wherein, by the amplifying circuit in filter and amplification module with every straight filtering circuit, described magnetosensitive transducing signal is carried out to filter and amplification.After magnetosensitive transducing signal amplifies after filtering, can input digital to analog converter (ADC) interface of one-chip computer module, sample for one-chip computer module; Further, also the magnetosensitive transducing signal after filter and amplification can be divided into two paths of signals, wherein digital to analog converter (ADC) interface of a road signal access one-chip computer module, sample for one-chip computer module, another road signal can access the input end of comparator circuit, the output terminal of comparator circuit is connected with the I/O interface of one-chip computer module, for to one-chip computer module transmitted signal, enters duty to trigger one-chip computer module from sleep state.
Step 103: in the time that vehicle crosses magneto-dependent sensor node, the magnetosensitive transducing signal after filter and amplification is sampled, obtain the sampled signal that comprises the time information that vehicle crosses.
The magnetosensitive transducing signal of digital to analog converter in one-chip computer module after to filter and amplification carries out A/D sampling, and sample frequency is preferably 1KHz.
Step 104: operation digital signal processing algorithm is removed the interference in sampled signal, obtains transport information eigenwert.
Step 105: transport information eigenwert is transferred to base station, so that base station is detected transport information according to transport information eigenwert.
The detection that carry out transport information according to 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, the second embodiment process flow diagram for the application's traffic information detection method:
Step 201: after magneto-dependent sensor node powers on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module in initialization magneto-dependent sensor node.
When the embodiment of the present application is applied on track, taking the track that typically comprises two tracks as example, on each track, according to certain length interval, magneto-dependent sensor node is set respectively, the line of the magneto-dependent sensor node arranging on each track is parallel with track, preferably, in the hole that magneto-dependent sensor node is imbedded on road surface to be beaten with 2 meters of intervals; Meanwhile, in the other control box in track, base station is set.Wherein, base station can with the magneto-dependent sensor node communication in single track, realize transport information on single track and detect, also can with all tracks on magneto-dependent sensor node communication, realize the traffic information collection on the section of track.Referring to Fig. 2 B, the structural representation transport information on single track being detected for base station; Referring to Fig. 2 C, the structural representation transport information on the section of track being detected for base station.
Wherein, magneto-dependent sensor node can be made up of magneto-dependent sensor module, filter and amplification module, one-chip computer module and radio-frequency module; Base station can be made up of one-chip computer module and radio-frequency module.Further, filter and amplification module can comprise amplifying circuit, every straight filtering circuit and comparator circuit; In radio-frequency module, can also comprise power amplification circuit, when ensureing with base station communication, signal can transmit in certain distance.
Concrete, the one-chip computer module in 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 GMR sensor; One-chip computer module in 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 is also preferably 433MHz.
Step 202: magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronous order of base station broadcast, and carries out clock synchronous according to clock synchronous order.
Magneto-dependent sensor node, after having powered on to the initialization of modules, is opened radio-frequency module and base station and is communicated; Meanwhile, base station powers on and completes after the initialization of one-chip computer module and radio-frequency module, and base station arranges timing cycle, and opens base station timer and carry out timing, then by wireless channel with broadcast mode to magneto-dependent sensor node tranmitting data register synch command.Magneto-dependent sensor node receives after clock synchronous order by radio-frequency module, carries out clock synchronous according to this clock synchronous order.Carrying out clock synchronous can avoid the clock of each magneto-dependent sensor node because the drift of crystal oscillator and step-out improves the accuracy that transport information detects.
Step 203: magneto-dependent sensor node is opened node timer, and closes radio-frequency module, is less than the time-count cycle of the base station timer arranging in base station the time-count cycle of this node timer.
Magneto-dependent sensor node, carrying out, after clock synchronous, closing radio-frequency module, makes one-chip computer module enter the sleep state of low-power consumption thus.Wherein, be less than the time-count cycle of the base station timer arranging in base station the time-count cycle of node timer, so that while not having vehicle to cross within the time-count cycle of base station timer, magneto-dependent sensor node can wake up from sleep state, open radio-frequency module, monitor channel, waits for and receives the clock synchronous order that base station sends.
Step 204: one-chip computer module enters sleep state.
Step 205: whether decision node timer arrives time-count cycle, if so, returns to step 202; Otherwise, execution step 206.
Step 206: magneto-dependent sensor node obtains magnetosensitive transducing signal.
Referring to Fig. 2 D, the magnetosensitive transducing signal schematic diagram while crossing magneto-dependent sensor node for vehicles failed, referring to Fig. 2 E, the magnetosensitive transducing signal schematic diagram while crossing magneto-dependent sensor node for vehicle.Hence one can see that, and in the time that vehicle crosses sensor node, the fluctuation of the magnetosensitive transducing signal generating is larger.
Step 207: magnetosensitive transducing signal is carried out to filter and amplification by the amplifying circuit in filter and amplification module with every straight filtering circuit.
Magnetosensitive transducing signal after filter and amplification is divided into two paths of signals, wherein digital to analog converter (ADC) interface of a road signal access one-chip computer module, sample for one-chip computer module, another road signal can access the input end of comparator circuit, the output terminal of comparator circuit is connected with the I/O interface of one-chip computer module, for to one-chip computer module transmitted signal.
Step 208: in the time that vehicle crosses magneto-dependent sensor node, by the comparator circuit in the magnetosensitive transducing signal input filter amplification module after amplifying, production burst signal.
While crossing due to vehicle, the fluctuation of magnetosensitive transducing signal is larger, therefore the amplitude of the magnetosensitive transducing signal after amplification filtering will be greater than the threshold value of comparator circuit setting, trigger thus comparator circuit output pulse signal, this pulse signal is used for making one-chip computer module to enter duty from sleep state.
Step 209: pulse signal is inputted to the I/O interface of single-chip microcomputer, made one-chip computer module enter duty, and open radio-frequency module.
Step 210: the magnetosensitive transducing signal by the digital to analog converter in one-chip computer module after to filter and amplification is sampled, obtains the sampled signal that comprises the time information that vehicle crosses.
The magnetosensitive transducing signal of digital to analog converter in one-chip computer module after to filter and amplification carries out A/D sampling, and sample frequency is preferably 1KHz.Known referring to Fig. 2 E, vehicle crosses the waveform similarity of the magnetosensitive transducing signal that two magneto-dependent sensor nodes produce, and mistiming that therefore can be between two signal peaks is crossed mistiming of two sensor nodes as vehicle.In addition, for the accuracy of result of calculation, except the above-mentioned mode that obtains the mistiming by peak value, can also adopt alternate manner to obtain the mistiming by operation digital signal processing algorithm, this embodiment of the present application is not limited.
Step 211: operation digital signal processing algorithm is removed the interference in sampled signal, obtains transport information eigenwert.
In fact transport information eigenwert is exactly in order to realize the convenient object that detects the transport information such as the speed of a motor vehicle, travel direction, the several special time information obtaining in the time of vehicle process magneto-dependent sensor node.For example, in conjunction with Fig. 2 E, these special moment can comprise the 20% corresponding moment of first crest amplitude, the 80% corresponding moment of first crest amplitude, the moment that first crest is corresponding, in the moment corresponding to maximal value of crest, signal is returned to moment of plateau (being that vehicle sails out of magneto-dependent sensor node) etc.
In the time carrying out value according to transport information eigenwert, for example, can adopt following manner of comparison:
1) magneto-dependent sensor node by periodic wakeup after, first collect the background magnetic field strength mean value in certain hour, when subsequent acquisition to the intensity level of magnetosensitive transducing signal while being greater than the certain threshold value of this average, can think and have vehicle to cross;
2) continue relatively, if obtaining after the maximal value of a certain magnetosensitive transducing signal, lasting 10 sampled points (such as, sampling rate is in 1KHz situation) value all do not exceed this maximal value, think that moment corresponding to this maximal value and this maximal value is the moment of primary peak amplitude and arrival thereof;
3) continue relatively, continue after the maximal value of a certain magnetosensitive transducing signal if obtain 500 sampled points (such as, sampling rate is in 1KHz situation) value do not exceed this maximal value, think maximal value that moment corresponding to maximal value and this maximal value is crest and arriving the moment; It should be noted that, continuing sampling number relatively can adjust according to sample frequency, and this embodiment of the present application is not limited;
4) when the intensity level of magnetosensitive transducing signal is for the first time lower than the moment of the average of background magnetic field intensity, think the moment that vehicle has sailed out of.
Step 212: transport information eigenwert is transferred to base station by radio-frequency module.
One-chip computer module can obtain corresponding time data from remove the sampled signal disturbing, and is transferred to base station after this time data is packed by radio-frequency module.
Step 213: base station is detected transport information according to transport information eigenwert.
To travel speed, base station receives after time data, and computing time is poor, can obtain the travel speed of vehicle by the interval between two magneto-dependent sensor nodes divided by the mistiming.
For travel direction, suppose track south-north direction, magneto-dependent sensor node 1 is arranged on by a southern side, magneto-dependent sensor node 2 is arranged on by a northern side, the vehicle due in that two magneto-dependent sensors report is respectively t1, and t2, if t1 > t2, judge that vehicle first passes through magneto-dependent sensor node 2, travel direction is served as reasons north to south, otherwise, if t1 < is t2, judge that vehicle first passes 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 start times and terminal are set in magneto-dependent sensor node, suppose the flow zero setting in start time moment, before the terminal moment arrives, often detect that a vehicle arrives, flow adds 1; Can record the magnitude of traffic flow in certain hour interval according to different starting points and terminal moment, 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, taking single magneto-dependent sensor node as a section, in observation time section T, each vehicle process, moves digital signal processing algorithm, detects that vehicle passes through this section time t used
i(n is the vehicle fleet passing through in observation time for i=1,2,3...n), the lane occupancy ratio in this observation time section calculates according to the 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, the embodiment block diagram for the application's transport information detection system:
This transport information detection system at least comprises: two magneto-dependent sensor nodes 310 and a base station 320, and convenient for example, in Fig. 3, only show two magneto-dependent sensor nodes 310 and a base station 320.Two magneto-dependent sensor nodes 310 are parallel to direction interval, track and arrange.
Wherein, described magneto-dependent sensor node 310, for the magnetosensitive transducing signal of acquisition is carried out to filter and amplification, in the time that vehicle crosses described magneto-dependent sensor node 310, magnetosensitive transducing signal after described filter and amplification is sampled, obtain the sampled signal that comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtain transport information eigenwert, described transport information eigenwert is transferred to described base station 320;
Described base station 320, for detecting transport information according to described transport information eigenwert.
Further, magneto-dependent sensor node can comprise (not shown in Fig. 3): one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module; In filter and amplification module, can comprise: amplifying circuit, block isolating circuit and comparator circuit.
Wherein, described magneto-dependent sensor node 310, also for after powering on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module described in initialization, open described radio-frequency module, receive the clock synchronous order of described base station broadcast, and carry out clock synchronous according to described clock synchronous order.
Further, described magneto-dependent sensor node 310, also for opening node timer, be less than the time-count cycle of the base station timer of described base station 320 interior settings the time-count cycle of described node timer, close described radio-frequency module, make described one-chip computer module enter sleep state, in the time that described node timer arrives time-count cycle, open described radio-frequency module, return and carry out the clock synchronous order that broadcast described reception base station 320.
Further, described magneto-dependent sensor node 310, carries out filter and amplification specifically for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal;
Described magneto-dependent sensor node 310, also for the magnetosensitive transducing signal after described amplification being inputted to the comparator circuit of described filter and amplification module, production burst signal, described pulse signal is inputted to the I/O interface of described single-chip microcomputer, make described one-chip computer module enter duty, and open described radio-frequency module;
Described magneto-dependent sensor node 310, the magnetosensitive transducing signal specifically for the digital to analog converter by described one-chip computer module after to described filter and amplification is sampled.
Further, described base station 320, specifically for detecting vehicle speed, vehicle flowrate, vehicle heading or lane occupancy according to described sampled signal.
Referring to Fig. 4, be the application's magneto-dependent sensor node the first embodiment block diagram:
This magneto-dependent sensor node comprises: magneto-dependent sensor module 410, filter and amplification module 420, one-chip computer module 430 and radio-frequency module 440.
Wherein, described magneto-dependent sensor module 410, for obtaining magnetosensitive transducing signal;
Described filter and amplification module 420, for carrying out filter and amplification by described magnetosensitive transducing signal;
Described one-chip computer module 430, for in the time that vehicle crosses described magneto-dependent sensor node, magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described radio-frequency module 440, for described transport information eigenwert is transferred to described base station, so that described base station is detected transport information according to described transport information eigenwert.
Referring to Fig. 5, be the application's magneto-dependent sensor node the second embodiment block diagram:
This dependent sensor node comprises: initialization module 510, timer module 520, magneto-dependent sensor module 530, filter and amplification module 540, one-chip computer module 550 and radio-frequency module 560.Concrete, filter and amplification module 540 can comprise (not shown in Fig. 5): amplifying circuit, every straight filtering circuit and comparator circuit.
Wherein, initialization module 510, after powering on for magneto-dependent sensor node, one-chip computer module 550, radio-frequency module 560, magneto-dependent sensor module 530 and filter and amplification module 540 described in initialization;
Described radio-frequency module 560, for receive afterwards the clock synchronous order of described base station broadcast in unlatching, and carries out clock synchronous according to described clock synchronous order;
Timer module 520, for opening node timer, is less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer;
Described radio-frequency module 560, also for closing after the described node timer of unlatching, and make described one-chip computer module enter sleep state, and open in the time that described node timer arrives time-count cycle, and return to the clock synchronous order of carrying out described reception base station broadcast;
Described magneto-dependent sensor module 530, for obtaining magnetosensitive transducing signal;
Filter and amplification module 540, carries out filter and amplification for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal; Described filter and amplification module 540, also when crossing described magneto-dependent sensor node when vehicle, magnetosensitive transducing signal after described amplification is inputted to the comparator circuit in described filter and amplification module, production burst signal, described pulse signal is inputted to the I/O interface of described single-chip microcomputer, made described one-chip computer module enter duty;
Described radio-frequency module 560 is also opened after entering duty at described one-chip computer module 550;
Described one-chip computer module 550, for the magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described radio-frequency module 560, also for described transport information eigenwert is transferred to described base station, so that described base station is detected transport information according to described transport information eigenwert.
Known by the description to above embodiment, the embodiment of the present application at least comprises two magneto-dependent sensor nodes and a base station, wherein two magneto-dependent sensor nodes are parallel to the setting of direction interval, track, the magnetosensitive transducing signal that magneto-dependent sensor node is obtained carries out filter and amplification, in the time that vehicle crosses magneto-dependent sensor node, magnetosensitive transducing signal after filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in sampled signal, obtain transport information eigenwert, transport information eigenwert is transferred to base station, so that base station is detected transport information according to transport information eigenwert.The embodiment of the present application communicates by magneto-dependent sensor node and base station are set, and realizes transport information and detects, and because system architecture is simple, road pavement is destroyed little, and therefore easy construction is convenient to safeguard; And periodically close, open sampling functions and the radio-frequency module of one-chip computer module by timer is set, can reduce the power consumption of system, make the system can long-play, transport information is detected.
Those skilled in the art can be well understood to the mode that technology in the embodiment of the present invention can add essential general hardware platform by software and realize.Based on such understanding, the part that technical scheme in the embodiment of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in 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, between each embodiment identical similar part mutually referring to, what each embodiment stressed is and the difference of other embodiment.Especially,, for system embodiment, because it is substantially similar in appearance to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a traffic information detection method, is characterized in that, is applied in the system that at least comprises two magneto-dependent sensor nodes and a base station, and described two magneto-dependent sensor nodes are parallel to direction interval, track and arrange, and described method comprises:
After magneto-dependent sensor node powers on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module described in initialization in magneto-dependent sensor node; Magneto-dependent sensor node is opened radio-frequency module, receives the clock synchronous order of described base station broadcast, and carries out clock synchronous according to described clock synchronous order;
Magneto-dependent sensor node is opened node timer, is less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer; Close described radio-frequency module, make described one-chip computer module enter sleep state;
In the time that described node timer arrives time-count cycle, open described radio-frequency module, return to the clock synchronous order of carrying out the described base station broadcast of described reception;
In the time that described node timer does not arrive time-count cycle, the magnetosensitive transducing signal that described magneto-dependent sensor node is obtained carries out filter and amplification;
In the time that vehicle crosses described magneto-dependent sensor node, the magnetosensitive transducing signal after described filter and amplification is sampled, obtain the sampled signal that comprises the time information that vehicle crosses;
Operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described transport information eigenwert is transferred to described base station, so that described base station is detected transport information according to described transport information eigenwert.
2. method according to claim 1, is characterized in that, describedly magnetosensitive transducing signal is carried out to filter and amplification is specially: by the amplifying circuit in described filter and amplification module with every straight filtering circuit, described magnetosensitive transducing signal is carried out to filter and amplification;
Described magnetosensitive transducing signal is carried out, after filter and amplification, also comprising:
Magnetosensitive transducing signal after described amplification is inputted to the comparator circuit in described filter and amplification module, production burst signal;
Described pulse signal is inputted to the I/O interface of described one-chip computer module, made described one-chip computer module enter duty, and open described radio-frequency module;
Described magnetosensitive transducing signal after described filter and amplification is sampled and is specially: the magnetosensitive transducing signal by the digital to analog converter in described one-chip computer module after to described filter and amplification is sampled.
3. method according to claim 1, it is characterized in that, describedly according to described sampled signal, transport information is detected and comprised: vehicle speed is detected, vehicle flowrate is detected, vehicle heading is detected or lane occupancy is detected.
4. a transport information detection system, it is characterized in that, comprise: at least two magneto-dependent sensor nodes and a base station, described two magneto-dependent sensor nodes are parallel to direction interval, track and arrange, described magneto-dependent sensor node comprises: one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module, wherein
Described magneto-dependent sensor node, for after powering on, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module, open described radio-frequency module described in initialization, receive the clock synchronous order of described base station broadcast, and carry out clock synchronous according to described clock synchronous order; Open node timer, be less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer, close described radio-frequency module, make described one-chip computer module enter sleep state, in the time that described node timer arrives time-count cycle, open described radio-frequency module, return to the clock synchronous order of carrying out described reception base station broadcast; In the time that described node timing does not arrive time-count cycle, the magnetosensitive transducing signal of acquisition is carried out to filter and amplification, in the time that vehicle crosses described magneto-dependent sensor node, magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert, and described transport information eigenwert is transferred to described base station;
Described base station, for detecting transport information according to described transport information eigenwert.
5. system according to claim 4, is characterized in that, described filter and amplification module comprises: amplifying circuit, block isolating circuit and comparator circuit,
Described magneto-dependent sensor node, carries out filter and amplification specifically for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal;
Described magneto-dependent sensor node, also for the magnetosensitive transducing signal after described amplification being inputted to the comparator circuit of described filter and amplification module, production burst signal, described pulse signal is inputted to the I/O interface of described single-chip microcomputer, make described one-chip computer module enter duty, and open described radio-frequency module;
Described magneto-dependent sensor node, the magnetosensitive transducing signal specifically for the digital to analog converter by described one-chip computer module after to described filter and amplification is sampled.
6. system according to claim 4, is characterized in that, described base station, specifically for detecting vehicle speed, vehicle flowrate, vehicle heading or lane occupancy according to described sampled signal.
7. a magneto-dependent sensor node, is characterized in that, comprising: magneto-dependent sensor module, filter and amplification module, one-chip computer module and radio-frequency module,
Described magneto-dependent sensor module, for obtaining magnetosensitive transducing signal;
Described filter and amplification module, for carrying out filter and amplification by described magnetosensitive transducing signal;
Described one-chip computer module, for in the time that vehicle crosses described magneto-dependent sensor node, magnetosensitive transducing signal after described filter and amplification is sampled, the sampled signal that acquisition comprises the time information that vehicle crosses, operation digital signal processing algorithm is removed the interference in described sampled signal, obtains transport information eigenwert;
Described radio-frequency module, for described transport information eigenwert is transferred to base station, so that described base station is detected transport information according to described transport information eigenwert.
8. magneto-dependent sensor node according to claim 7, is characterized in that, also comprises:
Initialization module, after powering on for magneto-dependent sensor node, one-chip computer module, radio-frequency module, magneto-dependent sensor module and filter and amplification module described in initialization;
Described radio-frequency module, also for receive afterwards the clock synchronous order of described base station broadcast in unlatching, and carries out clock synchronous according to described clock synchronous order.
9. magneto-dependent sensor node according to claim 8, is characterized in that, also comprises:
Timer module, for opening node timer, is less than the time-count cycle of the base station timer arranging in described base station the time-count cycle of described node timer;
Described radio-frequency module, also for closing after the described node timer of unlatching, and makes described one-chip computer module enter sleep state, and opens in the time that described node timer arrives time-count cycle, and return to the clock synchronous order of carrying out described reception base station broadcast.
10. magneto-dependent sensor node according to claim 9, is characterized in that, filter and amplification module comprises: amplifying circuit, every straight filtering circuit and comparator circuit,
Described filter and amplification module, carries out filter and amplification specifically for the amplifying circuit by described filter and amplification module with every straight filtering circuit to described magnetosensitive transducing signal;
Described filter and amplification module, also for the magnetosensitive transducing signal after described amplification being inputted to the comparator circuit of described filter and amplification module, production burst signal, inputs described pulse signal the I/O interface of described single-chip microcomputer, makes described one-chip computer module enter duty;
Described radio-frequency module is also opened after entering duty at described one-chip computer module;
Described one-chip computer module, specifically for by digital to analog converter the magnetosensitive transducing signal after to described filter and amplification sample.
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| CN103456176A (en) * | 2013-08-19 | 2013-12-18 | 程雄 | Processing method of magnetic field sensing signals of vehicle detecting device |
| CN104700627B (en) * | 2013-12-06 | 2017-03-01 | 感知技术无锡有限公司 | Method for detecting parking stalls, magnetosensitive detector, server and parking stall measure system |
| CN107507426A (en) * | 2017-08-25 | 2017-12-22 | 安徽实运信息科技有限责任公司 | A kind of urban track traffic for passenger flow guidance information publishing system |
| CN107481529A (en) * | 2017-08-25 | 2017-12-15 | 安徽实运信息科技有限责任公司 | A kind of traffic guidance delivery system based on magneto-dependent sensor |
| CN109215339B (en) * | 2018-08-24 | 2020-09-22 | 浙江大学 | Road indicating system and method based on real-time road condition analysis |
| CN109671269A (en) * | 2018-12-17 | 2019-04-23 | 何英明 | A kind of urban highway traffic facility digitlization implementation method |
| CN110542496A (en) * | 2019-10-09 | 2019-12-06 | 苏州泊讯物联网技术有限公司 | rolling sensing device and signal processing method thereof |
| CN111815964B (en) * | 2020-09-02 | 2020-12-29 | 四川九通智路科技有限公司 | Traffic flow detection system and method based on geomagnetic sensing type spike |
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