A kind of electronic tag and power calibrating method, calibrator (-ter) unit and calibration system
Technical field
The present invention relates to electronic label technology field, relate in particular to a kind of electronic tag and power calibrating method thereof, calibrator (-ter) unit and calibration system.
Background technology
No-stop charging system (ElectronicTollCollectionSystem, be called for short ETC system, claim again E-payment system) be to utilize automatic vehicle identification (AutomaticVehicleIdentification, being called for short AVI) technology completes the wireless data communication between vehicle and charge station, carries out automatic vehicle identification and the exchange about charge data; Carry out the processing of charge data by Computer network, realize the all-electronin Fare Collection System of the automatic charging that do not stop.
ETC system is a kind of automatic electronic charging system for highway, bridge and tunnel developing and promote of making great efforts in the world. This technology is existing longer developing history abroad, and the local networking of the E-payment system of many countries and regions such as the U.S., Europe also progressively forms scale and benefit.
RSU is roadside unit (Road-SideUnits is called for short RSU), is called again electronic label read/write, trackside read-write antenna, ETC antenna, roadside device. RSU is made up of microwave antenna and read-write controller. Be arranged on the lane in which the drivers should pay fees door frame or on toll island column the antenna communicating for the mobile unit on same vehicular traffic and corresponding control appliance.
OBU is board units OBU(OnBoardUnit, is called for short OBU), be called again electronic tag, mobile unit. OBU is a kind of mobile identification equipment with microwave communication function and information storage function, is arranged on vehicle interior (on windshield or instrument desk) and supports the equipment that utilizes DSRC and roadside device to carry out information exchange.
Because the windshield of the vehicle of the even each individuality of each brand specification there are differences, directly be reflected in for ETC system: the windshield of every vehicle is inconsistent to the attenuation degree of radio frequency working signal, but the forward power output of each electronic tag in the time dispatching from the factory is consistent with the grade of oppositely sensitivity, so, under same roadside unit (RSU), the transaction coverage of different vehicle will there are differences.
The appearance of this difference, will cause different vehicle in distance R SU different distance, to start transaction. If vehicle is widely different, the vehicle that causes possibly two front and back to be travelled, RSU first reads the label of rear car, not even transaction of transaction after front truck, such situation has very large impact for the actual motion of ETC system.
In prior art, be the devices such as switch by reserving the types such as dial-up in structure mostly, apolegamy two, to the sensitivity of third gear, is rule of thumb selected the receiving sensitivity of 2 to 3 grades, to adapt to the inconsistent situation of windshield attenuation of different vehicle by user. But compared with numerous vehicles, only two is the difference requirements that can not meet various vehicles completely to third gear, and this compensation is discrete and discrete compensation.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of electronic tag and power calibrating method, calibrator (-ter) unit and calibration system, can carry out according to practical application scene the self adaptation adjustment of transmitting power and receiving sensitivity, to solve different vehicle windshield, radio frequency signal attenuation difference be caused to the different deficiency of label trading range.
For solving the problems of the technologies described above, the invention provides a kind of calibrator (-ter) unit, be applied to E-payment system, described calibrator (-ter) unit comprises that parameter setting apparatus and calibration information send link,
Described parameter setting apparatus is used for, and sets calibration information;
Described calibration information sends link and is used for, and sends described calibration information to electronic tag;
Wherein, described calibration information comprises: the calibration power class information of not decaying containing vehicle windscreen.
Further, described calibrator (-ter) unit also comprises positioner,
Described positioner is used for, and ensures that the spacing of described calibrator (-ter) unit and described electronic tag is fixed.
Further, described calibrator (-ter) unit also comprises data receiver link, and micro-control unit,
Described data receiver link is used for, and the self adaptation that receives described electronic tag is adjusted complete signal or calibration end signal, and sends to described micro-control unit;
Described micro-control unit is used for, and receives described self adaptation and adjusts after complete signal, controls described calibration information and send electronic tag described in chain road direction and send the calibration information of described setting; And, receive after described calibration end signal, finish current calibration process.
The present invention also provides a kind of electronic tag, is applied to E-payment system, and described electronic tag comprises:
Forward emitted link, for receiving calibration information and sending to microprocessing unit, wherein said calibration information comprises: the calibration power class information of not decaying containing vehicle windscreen; And, adjust transmitting power according to the adjustment signal receiving;
Signal strength detection link, for according to the intensity of the radiofrequency signal detecting, obtains actual power class information and sends to described microprocessing unit;
Microprocessing unit, the calibration power class information receiving for basis and actual power class information obtain the attenuation of vehicle windscreen, and determine whether to calibrate according to the described attenuation obtaining, if determine and need to calibrate, calculate the transmitting power and/or the receiving sensitivity that need adjustment, and send respectively the corresponding signal of adjusting to forward emitted link and reverse receiver;
Oppositely receiver, for adjusting receiving sensitivity according to the adjustment signal receiving.
Further, described microprocessing unit also for, if determine and need to calibrate, also send self adaptation by described forward emitted chain road direction calibrator (-ter) unit and adjust complete signal; If determine and do not need to calibrate, send calibration end signal by described forward emitted chain road direction calibrator (-ter) unit.
Further, described forward emitted link further comprises: modulator, power amplifier, electric adjustable attenuator and transmitting antenna;
Wherein, the described adjustment signal of described electric adjustable attenuator for sending according to the described microprocessing unit receiving, adjusts the value that Signal Regulation decays.
Further, described reverse receiver further comprises: reception antenna, electric adjustable attenuator, demodulator, baseband signal amplifier, baseband signal Shaping Module;
Wherein, the described adjustment signal of described electric adjustable attenuator for sending according to the described microprocessing unit receiving, adjusts the value that Signal Regulation decays.
In addition, the present invention also provides a kind of electronic tag power calibrating method, is applied to E-payment system, and described method comprises:
Set calibration information, wherein said calibration information comprises: the calibration power class information of not decaying containing vehicle windscreen;
Obtain the attenuation of vehicle windscreen according to described calibration power class information and the actual power class information detecting, and determine whether to calibrate according to the described attenuation obtaining, if determine and need to calibrate, calculate the transmitting power and/or the receiving sensitivity that need adjustment, and transmitting power and/or receiving sensitivity are adjusted.
The present invention also provides a kind of electronic tag calibration of power system, and described calibration of power system comprises electronic tag and calibrator (-ter) unit, and described calibrator (-ter) unit further comprises that parameter setting apparatus and calibration information send link; Described electronic tag comprises: forward emitted link, signal strength detection link, microprocessing unit, and reverse receiver, wherein:
Described parameter setting apparatus is used for, and sets calibration information, and described calibration information comprises: the calibration power class information of not decaying containing vehicle windscreen;
Described calibration information sends link and is used for, and sends described calibration information to described electronic tag;
Described forward emitted link is used for, and receives described calibration information and sends to microprocessing unit; And, adjust transmitting power according to the adjustment signal receiving;
Described signal strength detection link is used for, and according to the intensity of the radiofrequency signal detecting, obtains actual power class information and sends to described microprocessing unit;
Described microprocessing unit is used for, obtain the attenuation of vehicle windscreen according to the calibration power class information receiving and actual power class information, and determine whether to calibrate according to the described attenuation obtaining, if determine and need to calibrate, calculate the transmitting power and/or the receiving sensitivity that need adjustment, and send respectively the corresponding signal of adjusting to forward emitted link and reverse receiver;
Described reverse receiver is used for, and adjusts receiving sensitivity according to the adjustment signal receiving.
Further, described calibrator (-ter) unit also comprises positioner, data receiver link, and micro-control unit;
Described positioner is used for, and ensures that the spacing of described calibrator (-ter) unit and described electronic tag is fixed;
Described microprocessing unit also for, if determine and need to calibrate, also send self adaptation by described forward emitted chain road direction calibrator (-ter) unit and adjust complete signal; If determine and do not need to calibrate, send calibration end signal by described forward emitted chain road direction calibrator (-ter) unit;
Described data receiver link is used for, and the self adaptation that receives described electronic tag is adjusted complete signal or calibration end signal, and sends to described micro-control unit;
Described micro-control unit is used for, and receives described self adaptation and adjusts after complete signal, controls described calibration information and send electronic tag described in chain road direction and send the calibration information of described setting; And, receive after described calibration end signal, finish current calibration process.
Compared to prior art, the present invention at least has following advantage and beneficial effect:
1, electronic tag of the present invention possesses the function of electric adjustable transmission power and receiving sensitivity;
2, can carry out self adaptation adjustment according to practical application scene, without human intervention;
3, adjusting range is large, can meet the differentiated demand of variety classes vehicle, and adjusts Equicontinuous, but not discrete point;
4 and corresponding calibrator (-ter) unit is provided, be responsible for sending calibration information to electronic tag.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 is the composition schematic block diagram of the electronic tag of the embodiment of the present invention;
Fig. 2 is the composition schematic block diagram of the calibrator (-ter) unit of the embodiment of the present invention;
Fig. 3 is the adaptive power calibration schematic flow sheet of the embodiment of the present invention;
Fig. 4 is the composition schematic block diagram of the electronic tag forward emitted link of the embodiment of the present invention;
Fig. 5 is the composition schematic block diagram of the reverse receiver of electronic tag of the embodiment of the present invention.
Detailed description of the invention
Main purpose of the present invention is, a kind of electronic tag that can carry out according to practical application scene the self adaptation adjustment of transmitting power and receiving sensitivity is provided, to solve different vehicle windshield, radio frequency signal attenuation difference is caused to the different situation of label trading range. Meanwhile, the present invention also provides a kind of corresponding calibrator (-ter) unit, is used to electronic tag that calibration power information is provided.
For achieving the above object, the invention provides a kind of electronic tag power calibrating method, specifically adopt following technical scheme:
Set calibration information, described calibration information comprises: the calibration power class information of not decaying containing vehicle windscreen;
Obtain the attenuation of vehicle windscreen according to described calibration power class information and the actual power class information detecting, and determine whether to calibrate according to the described attenuation obtaining, if determine and need to calibrate, calculate the transmitting power and/or the receiving sensitivity that need adjustment, and transmitting power and/or receiving sensitivity are adjusted.
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated. It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can be combined mutually.
In the embodiment of the present invention, propose a kind of electronic tag calibration of power system, mainly comprise electronic tag equipment and calibrator (-ter) unit two parts.
As shown in Figure 1, the electronic tag of the present embodiment mainly comprises: microprocessing unit, forward emitted link, reverse receiver, signal strength detection link. Wherein:
Microprocessing unit, the main output of being responsible for received signal strength detection link, according to the signal strength signal intensity detecting, calculate the attenuation of place vehicle windscreen to radiofrequency signal, calculate according to attenuation the power grade that forward emitted link need to compensate, and the sensitivity that oppositely receiver need to be adjusted, then send adjustment signal to forward direction transmitting chain and reverse receiver respectively, complete the self adaptation adjustment to above-mentioned two links;
Signal strength detection link, is mainly responsible for the signal strength signal intensity of the calibrating signal of testing calibration equipment transmission, and signal strength signal intensity is fed back to microprocessing unit;
Forward emitted link, is mainly modulation and the output of being responsible for label forward signal, and another one critical function is the function that possesses electric capable of regulating power output grade.
Oppositely receiver, is mainly the radio-frequency wakeup signal of being responsible for label reception roadside unit, completes demodulation, and another one critical function is the function that possesses electric adjustable receiving sensitivity. Microprocessing unit two chain of stations roads complete the adjustment to forward power and receiving sensitivity, i.e. adaptive calibration according to adjusting signal.
As shown in Figure 2, the calibrator (-ter) unit of the embodiment of the present invention mainly comprises circuit part and structure division, and wherein circuit part mainly comprises calibration power transmitting chain, and parameter setting apparatus; Structure division mainly comprises positioner.
Referring to Fig. 2, signal, the information of process information typing module input, control calibration information that the micro-control unit of calibrator (-ter) unit is mainly responsible for reception & disposal data receiver link send link and send the functions such as data.
The calibration information of calibrator (-ter) unit sends link, is mainly responsible for transmitting calibration Frame, and calibration data frame comprises calibration information, as calibration power class information etc. Wherein, the emitting power grade of calibration information transmission link is known.
The parameter of calibrator (-ter) unit arranges part, and Data Enter module as shown in Figure 2, has been mainly used in setting emitting power grade, and other calibration parameters.
The positioner of calibrator (-ter) unit is to utilize structure to ensure to keep fixing spacing accurately between calibrator (-ter) unit and electronic tag, to ensure accuracy and the stability of calibration.
The concrete installation process of electronic tag calibration of power system is described below:
When mounted, electronic tag is mounted on the windshield of vehicle, calibrator (-ter) unit, outside vehicle windscreen, just to label, and can be ensured by the positioner of calibrator (-ter) unit with the distance of electronic tag. By local dielectric constant of air input calibrator (-ter) unit (Data Enter module), calibrator (-ter) unit rule of thumb formula calculates the not calibration power grade that sends to electronic tag (also referred to as initial power grade) containing windshield decay.
Shown in Fig. 3, the concrete calibration process of electronic tag calibration of power system mainly comprises the following steps:
Step 301, the reverse receiver of electronic tag receives the normal data frame signal that calibrator (-ter) unit sends;
In this Frame, comprise the calibration of power information that calibrator (-ter) unit sends to electronic tag, the calibration power class information of for example not decaying containing windshield.
Step 302, the normal data frame signal that signal strength detection link arrives according to physical detection, measures the actual power class information of signal.
Step 303, oppositely receiver is by the signal strength signal intensity not decaying containing windshield demodulating, and calibration of power information, sends to microprocessing unit.
Step 304, signal strength detection link is by the signal strength signal intensity containing windshield decay, and the actual power class information detecting, sends to microprocessing unit.
Step 305, microprocessing unit calculates attenuation according to the calibration power class information of receiving and actual power class information, and judge whether to calibrate according to the attenuation calculating, as judge whether consistent (attenuation is less than predetermined threshold value and thinks consistent) of signal strength signal intensity, if need to calibrate, calculate respectively the power grade that forward emitted link need to compensate, and the sensitivity that oppositely receiver need to be adjusted.
The actual power grade that microprocessing unit is measured calibration power grade and signal strength detection link differs from operation, and the difference obtaining just can be considered as the attenuation of vehicle windscreen to working signal.
Step 306~307, microprocessing unit sends adjustment signal to forward direction transmitting chain and reverse receiver, and forward emitted link and oppositely receiver complete the adjustment to forward power and receiving sensitivity, i.e. adaptive calibration according to adjustment signal.
Step 308, microprocessing unit sends self adaptation by forward emitted chain road direction calibrator (-ter) unit and adjusts complete data signal.
Step 309, forward emitted chain road direction calibrator (-ter) unit sends self adaptation and adjusts complete radiofrequency signal.
Step 310, calibrator (-ter) unit receives self adaptation and adjusts after complete radiofrequency signal, continues to send calibration data frame signal to electronic tag.
Step 311~313, with above-mentioned steps 302~304.
Step 314, microprocessing unit calculates attenuation according to the calibration power class information of receiving and actual power class information, and judge whether to calibrate according to the attenuation calculating, if two signal strength signal intensities consistent (for example attenuation is less than predetermined threshold value), explanation does not need to calibrate, and carries out next step 315.
Step 315, microprocessing unit sends calibration end number signal by forward emitted chain road direction calibrator (-ter) unit.
Step 316, forward emitted chain road direction calibrator (-ter) unit sends calibration and finishes radiofrequency signal.
Calibrator (-ter) unit receives that this calibration finishes after radiofrequency signal, thinks that calibration completes, and so far, this calibration process finishes.
In addition, the present invention also provides a kind of power electricity tunable radio frequency forward emitted link, and this forward emitted link possesses the function of electric capable of regulating power output grade. Please refer to Fig. 4, this link specifically comprises: modulator, power amplifier, electric adjustable attenuator and transmitting antenna etc. Modulation signal and carrier signal arrive the input stage of power amplifier after the modulation of modulator, and power amplifier amplifies signal, and attenuator can be controlled to regulate by adjustment signal the value of decay, and signal is gone out by antenna transmission after attenuator.
The present invention also provides a kind of receiving sensitivity electricity adjustable reverse receiver, please refer to Fig. 5, and this link specifically comprises: reception antenna, electric adjustable attenuator, demodulator, baseband signal amplifier, baseband signal Shaping Module. Wherein, reception antenna receives the modulation signal in space, attenuator can be controlled the size of attenuation under the conciliation of adjusting signal, the signal receiving demodulates baseband signal after demodulator, baseband signal is converted to data signal after baseband amplifier and Shaping Module, gives microprocessor and processes.
These are only preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized. like this, the present invention is not restricted to any specific hardware and software combination.