CN105160719B - Roadside unit, board units signal screening system and signal screening method - Google Patents
Roadside unit, board units signal screening system and signal screening method Download PDFInfo
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- CN105160719B CN105160719B CN201510569985.4A CN201510569985A CN105160719B CN 105160719 B CN105160719 B CN 105160719B CN 201510569985 A CN201510569985 A CN 201510569985A CN 105160719 B CN105160719 B CN 105160719B
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Abstract
A kind of roadside unit, board units signal screening system and signal screening method.The board units signal screening system includes：Signal receiving unit for receiving signal from board units, and converts the signals to the analog signal for signal processing；Amplify shaping unit, analog signal is received from signal receiving unit, and shaping is amplified to analog signal, so as to generate to carry out the first digital signal of data processing；Signal screening unit receives analog signal from signal receiving unit and receives the first digital signal from amplification shaping unit, and by performing an analysis to determine whether to export the first digital signal to carry out data processing to analog signal.The board units signal screening system and method can reduce the mistake transaction rate in ETC system and improve the success rate being open to traffic.
Description
The application is application number 201110223568.6,2011 applyings date August 5 days, denomination of invention " roadside unit, vehicle
The divisional application of carrier unit signal screening system and signal screening method ".
Technical field
The present invention relates to intelligent transportation field, more particularly, be related to it is a kind of electric non-stop toll (ETC,
Electronic Toll Collection) roadside unit in lane system, board units signal screening system and method.
Background technology
ETC system is a kind of when vehicle passes through charge station, vehicle can be identified in the case of without parking
And the system for carrying out automatic fee.In general, it needs that board units (OBU, On Broad is installed using the vehicle of ETC system
Unit), thus in the charge station by using ETC system, with roadside unit (RSU, the Road Side installed in track
Unit) communicated to complete to merchandise, so as to fulfill the function of automatic charging.
However, in current vehicle management automatic identification, RSU may receive neighbouring track or the adjacent vehicle in same track
OBU signals, cause RSU that can be generated with other OBU and merchandise by mistake, repetition be caused to be charged or situation about not charging.
The content of the invention
Insufficient present in order to overcome, the present invention provides a kind of board units signal screening system and method, energy
Enough effectively reduce the mistake transaction rate of ETC system, be open to traffic success rate with improving so that ETC system can more efficiently into
Row transaction.
The present invention provides a kind of board units signal screening system, the system comprises：Signal receiving unit, for from
Board units receive signal, and convert the signals to the analog signal for signal processing；Amplify shaping unit, from signal
Receiving unit receives analog signal, and is amplified shaping to analog signal, so as to generate to carry out the first of data processing
Digital signal；Signal screening unit receives analog signal from signal receiving unit and receives the first number from amplification shaping unit
Signal, and by performing an analysis to determine whether to export the first digital signal to carry out data processing to analog signal.
Preferably, signal screening unit may include：Signal generation unit is screened, simulation letter is received from signal receiving unit
Number, and by the signal strength of the analog signal of reception compared with the first predetermined threshold value, to determine the letter of signal receiving unit reception
Number whether it is the useful signal currently needed transmitted by the board units being traded, and the screening letter of output indication comparative result
Number；Selecting unit receives the first digital signal from amplification shaping unit, and according to the screening received from screening signal generation unit
Signal determines whether to export the first digital signal to carry out data processing.
Preferably, screening signal generation unit may include：Signal conversion unit, described in being received from signal receiving unit
Analog signal, and the signal strength of the analog signal is compared with the first predetermined threshold value, when the signal strength of analog signal
During greater than or equal to the first predetermined threshold value, the analog signal is converted to the 3rd digital signal and defeated by the signal conversion unit
Go out the 3rd digital signal, when the signal strength of analog signal is less than the first predetermined threshold value, the signal conversion unit is defeated
Go out low level signal；Detection unit, the signal for being exported to signal conversion unit carry out detection, are connect when from signal conversion unit
When receiving three digital signals, rectified signal of the detection unit output with the first DC voltage connects when from signal conversion unit
When receiving low level signal, rectified signal of the detection unit output with the second DC voltage；Voltage comparison unit, from detection list
Member receives rectified signal and the voltage of the rectified signal received compares with reference voltage, to determine that the detection received is believed
Number it is the rectified signal with the first DC voltage or the rectified signal with the second DC voltage, when the detection letter received
Number voltage be higher than reference voltage when, voltage comparison unit determines to receive the rectified signal with the first DC voltage, and defeated
Go out high level signal as screening signal, when the voltage of the rectified signal received is less than reference voltage, voltage comparison unit
It determines to receive the rectified signal with the second DC voltage, and exports low level signal as screening signal.
Preferably, signal screening unit may include：Signal processing unit receives analog signal from signal receiving unit, with
Generation reflects the second digital signal of the intensity of the analog signal, and it is true that second digital signal is output to signal output
Order member；Signal output determination unit receives the second digital signal from signal processing unit and it is parsed, to determine to be
It is no to export to carry out data processing from amplification shaping unit the first digital signal of reception and the first digital signal.
Preferably, signal processing unit may include：Detection unit carries out the analog signal received from signal receiving unit
Detection, and by the analog signal be converted to reflection analog signal intensity d. c. voltage signal.AD conversion unit, from inspection
Ripple unit receives d. c. voltage signal, and the d. c. voltage signal is converted to the voltage value for reflecting the d. c. voltage signal
The second digital signal.
Preferably, signal output determination unit can obtain reflection analog signal by being parsed to the second digital signal
Intensity voltage value, and the voltage value of acquisition is compared with predetermined threshold value.If the voltage value is greater than or equal to second
Predetermined threshold value, then signal output determination unit determine that signal receiving unit received signal is useful signal, from amplification shaping list
Member receives the first digital signal and exports the first digital signal to carry out data processing；If it is pre- that the voltage value is less than second
If threshold value, then signal output determination unit determines that signal receiving unit received signal is not useful signal, and does not receive
One digital signal.
The present invention also provides a kind of roadside unit, this roadside unit includes board units signal as characterized above and sieves
Select system.
The present invention also provides a kind of board units signal screening method, the described method includes：It receives and believes from board units
Number, and convert the signals to the analog signal for signal processing；Shaping is amplified to the analog signal, so as to raw
Into for carrying out the first digital signal of data processing；By being performed an analysis to determine whether to the analog signal by the first number
Word signal output is to carry out data processing.
Preferably, the analog signal is performed an analysis to determine whether by the first digital signal be output to processor with into
The step of row data processing, may include：By the signal strength of analog signal compared with the first predetermined threshold value, to determine from vehicle
Whether carrier unit received signal is the useful signal currently needed transmitted by the board units being traded, and output indication ratio
The screening signal of relatively result；Screening signal according to being received from screening signal generation unit determines whether to export the first digital signal
To carry out data processing.
Preferably, the analog signal is performed an analysis to determine whether by the first digital signal be output to processor with into
The step of row data processing, may include：It receives analog signal and is believed with generating the second of the intensity for reflecting the analog signal the number
Number, and export the second digital signal；Second digital signal is parsed, to determine whether to receive the first digital signal and by the
One digital signal exports to carry out data processing.
Preferably, when the signal strength of analog signal is greater than or equal to the first predetermined threshold value, the screening signal can refer to
Show that from board units received signal be useful signal；It is described when the signal strength of analog signal is less than the first predetermined threshold value
Screening signal may indicate that from board units received signal be not useful signal.
Preferably, the second digital signal is parsed, with determine whether receive the first digital signal and by first number
Signal output the step of carrying out data processing to may include：By being parsed to the second digital signal, reflection simulation letter is obtained
Number intensity voltage value, and the voltage value of acquisition is compared with the second predetermined threshold value, if the voltage value is more than or waits
In the second predetermined threshold value, it is determined that from board units received signal be useful signal, receive the first digital signal and by first
Digital signal exports to carry out data processing；If the voltage value is less than the second predetermined threshold value, it is determined that is connect from board units
The signal of receipts is not useful signal, and does not receive the first digital signal.
Using the signal screening system and method for the present invention, can rapidly distinguish needs the vehicle being traded to be sent out
The signal sent effectively excludes monkey chatter and the influence of co-channel interference, therefore can reduce the mistake transaction rate in ETC system simultaneously
Improve the success rate being open to traffic.On the other hand, since the application of the present invention causes the mistake transaction rate of ETC system to greatly reduce,
It can reduce due to the additional cost of labor brought and the time cost of merchandising by mistake, and the speed that is open to traffic in ETC tracks can be improved,
Therefore the user in ETC tracks can be made to obtain better user experience.
Description of the drawings
Fig. 1 a are the block diagrams of the configuration of board units (OBU) signal screening system of the present invention.
Fig. 1 b are the block diagrams of the configuration of the OBU signal receiving units of the embodiment of the present invention 1.
Fig. 1 c are the block diagrams of the configuration of the signal screening unit of the embodiment of the present invention 1.
Fig. 1 d are the block diagrams of the configuration of the screening signal generation unit of the embodiment of the present invention 1.
Fig. 2 is the block diagram of the configuration of the OBU signal receiving units of the embodiment of the present invention 2.
Fig. 3 a are the block diagrams of the configuration of the signal screening unit of the embodiment of the present invention 3.
Fig. 3 b are the block diagrams of the configuration of the signal processing unit of the embodiment of the present invention 3.
Fig. 4 is the flow chart of the OBU signal screening methods of the embodiment of the present invention 4.
Fig. 5 is the flow chart of the OBU signal screening processing methods of the embodiment of the present invention 5.
Fig. 6 is the flow chart of the OBU signal screening processing methods of the embodiment of the present invention 6.
Specific embodiment
Embodiment is described in detail below in conjunction with the accompanying drawings, then above and other objects of the present invention, features and advantages
It will become apparent.
Board units (OBU) signal screening system 100 can be mounted on roadside unit (RSU).As shown in Figure 1a, OBU believes
Number screening system 100 includes：Signal receiving unit 110, signal screening unit 120, amplification shaping unit 130.
In the present embodiment, the OBU that signal receiving unit 110 is installed from the vehicle by track receives OBU signals, and
The OBU signals are demodulated the OBU signals are converted to the analog signal that can carry out signal processing.
Signal receiving unit 110 can be well known in the prior art signal receiving device or circuit, as shown in Figure 1 b, letter
Number receiving unit 110 may include：Low-noise amplifier (LNA) 111, frequency mixer 112, bandpass filter (BPF) 113, amplifier
114 and carrier frequency generation circuit 115.When receiving OBU signals by antenna (not shown), OBU signals can be input into LNA
111 to carry out low noise amplification, and frequency mixer 112 amplifies using by the CF signal that carrier frequency generation circuit 115 generates to passing through low noise
OBU signals carry out frequency transformation, so as to which the OBU signals are transformed to baseband signal.BPF 113 exports frequency mixer 112
Baseband signal be filtered to remove the noise in signal.Then, filtered signal is put using amplifier 114
Greatly, so that the signal can be detected and handled by signal processing apparatus thereafter, so as to obtain RSSI analog signals.
Amplify shaping unit 130 and receive RSSI analog signals from signal receiving unit 110, and the signal is amplified
Shaping can detect so as to which the RSSI analog signals of reception are converted to processor (for example, micro-control unit (MCU)) (not shown)
And the digital signal D of data processing can be carried out1, so as to handle the information carried in OBU signals.In addition, in this reality
It applies in example, amplification shaping unit 130 can also be the amplification shaping unit 130 with delay function, be connect with adjustment as needed
The delay time of the signal of receipts so that in signal screening unit 120, from amplification 130 received signal of shaping unit with from signal
110 received signal of receiving unit is synchronous.
Signal screening unit 120 receives RSSI analog signals from signal receiving unit 110 and is connect from amplification shaping unit 130
Receive digital signal D1, and RSSI analog signals are performed an analysis to determine whether digital signal D1Processor is output to carry out
Data processing.Signal screening unit 120 is described in detail later with reference to Fig. 1 c.
As illustrated in figure 1 c, signal screening unit 120 may include to screen signal generation unit 121 and selecting unit 122.
It screens signal generation unit 121 and receives RSSI analog signals from signal receiving unit 110, and by the RSSI moulds of reception
Intend the intensity of signal compared with predetermined threshold value, so that it is determined that whether being currently to need by 110 received signal of signal receiving unit
Useful signal (hereinafter referred to as useful signal) transmitted by the OBU for the vehicle to be traded.It should be understood that the predetermined threshold
Value can be an intensity value of the manual setting in OBU signal screenings system 100 or according to by multiple RSU it
Between synchronous collaboration, an intensity value definite by experiment repeatedly.The setting of the predetermined threshold should to be not belonging to
Currently the signal for the OBU being traded is needed to be filtered out, so as to exclude the adjacent of the OBU signals of adjacent lane or identical track
The interference that the OBU signals of vehicle generate.
According to comparative result of the RSSI analog signals that will be received compared with predetermined threshold value, signal generation unit is screened
The screening signal for indicating comparative result is sent to selecting unit 122 by 121.For example, when the signal of the RSSI analog signals received
When intensity is less than predetermined threshold value (that is, not being useful signal by 110 received signal of signal receiving unit), screening signal generates single
121 exportable low level signal of member is as screening signal；When the signal strength of the RSSI analog signals of reception is greater than or equal in advance
When determining threshold value (that is, 110 received signal of signal receiving unit is useful signal), screening signal generation unit 121 is exportable
High level signal is as screening signal.
Fig. 1 d show an example of screening signal generation unit 121.Screening signal generation unit 121 may include (but unlimited
In)：Signal conversion unit 123, detection unit 124 and voltage comparison unit 125.
Signal conversion unit 123 can by the signal strength of the RSSI analog signals received from signal receiving unit 110 with it is pre-
If threshold value is compared, when the signal strength of the RSSI analog signals is higher than predetermined threshold value, signal conversion unit 123 will
RSSI analog signals are converted to digital signal S1And output digit signals S1.When the signal strength of the RSSI analog signals is less than
During predetermined threshold value, signal conversion unit 123 will export a low level signal VL。
Although RSSI analog signals can be converted to digital signal S by signal conversion unit 1231, but due to working as signal
When the signal power of 123 received signal of converting unit is relatively low, the digital signal S of the output of signal conversion unit 1231Duty cycle
It can be deteriorated so that the MCU (not shown) in RSU can not parse the information entrained by the digital signal, therefore in the present embodiment
In be difficult to the digital signal S directly exported using signal conversion unit 1231As the signal that data processing is carried out in MCU.
Detection unit 124 is used to carry out detection to the signal that signal conversion unit 123 exports.In the present embodiment, letter is worked as
The output of number converting unit 123 is digital signal S1When, DC voltage detection of the output of detection unit 124 with particular voltage level
Signal U1(for example, signal with the high level specified).When the output of signal conversion unit 123 is low level VLWhen, detection list
124 DC voltage rectified signal U of the output with another voltage value of member2(for example, with the low level voltage specified).
In the present embodiment, the voltage of the DC voltage rectified signal exported due to detection unit 124 may be by thereafter
Circuit changes, it is thus possible to be difficult to that the rectified signal that detection unit 124 exports directly is used to be input to selection as screening signal
Unit 122 carries out signal screening.Rectified signal therefore, it is necessary to which detection unit 124 is exported is converted to burning voltage
Signal.
In the present embodiment, voltage comparison unit 125 can receive rectified signal (that is, U from detection unit 1241Or U2).
The rectified signal can be compared to determine detection unit 124 with default reference voltage and exported by voltage comparison unit 125
Rectified signal be U1Or U2, and screening signal is exported according to definitive result, wherein, the voltage value of the reference voltage should expire
Foot：U2Voltage ＜ reference voltage ＜ U1Voltage.Specifically, when the voltage of the rectified signal received from detection unit 124 is high
When reference voltage, voltage comparison unit 125 can determine that detection unit 124 exports U1, and high level signal is exported as screening
Signal；When the voltage of the rectified signal received from detection unit 124 is less than reference voltage, voltage comparison unit 125 can determine
Detection unit 124 exports U2, and low level signal is exported as screening signal, so as to generate the screening letter with stable level
Number.In other words, when 110 received signal of signal receiving unit is useful signal, voltage comparison unit 125 exports high level
Signal is as screening signal；When 110 received signal of signal receiving unit is not useful signal, voltage comparison unit 125 is defeated
Go out low level signal as screening signal.
It should be understood that the screening signal that screening signal generation unit 121 exports can be not limited to high level signal/low level letter
Number.Selectively, screening signal can also be other kinds of signal, for example, it is described screening signal can also be pulse signal/
Non-pulse signal.Specifically, when 110 received signal of signal receiving unit is useful signal, signal generation unit is screened
121 exportable pulse signals are as screening signal；When 110 received signal of signal receiving unit is not useful signal, screening
A 121 exportable non-pulse signal (for example, direct current signal) of signal generation unit is as screening signal, so as to selecting unit 122
Usable pulse signal is triggered, to complete signal screening processing.In addition, work as 110 received signal of signal receiving unit not
When being useful signal, screening signal generation unit 121 can not also export any signal.
Referring again to Fig. 1 c, selecting unit 122 receives the digital signal D exported from amplification shaping unit 1301, and according to
The screening signal received from screening signal generation unit 121 is to digital signal D1Screening Treatment is carried out, to determine whether to export number
Word signal D1To carry out data processing.Specifically, in the present embodiment, when the screening that screening signal generation unit 121 exports
When signal is high level signal (that is, the OBU signals that signal receiving unit 110 receives are useful signal), selecting unit 122 will be put
130 output digit signals D of big shaping unit1MCU (not shown) is input to carry out data processing；When screening signal is low level
During signal (that is, the OBU signals that signal receiving unit 110 receives are not useful signals), selecting unit 122 is exportable with digital letter
Number D1Different signal specific (for example, low level signal or high level signal etc.) does not export signal.
In the present embodiment, the selecting unit 122 can be to screening signal and digital signal D1Carry out logical AND behaviour
The logical AND circuit of work, thus when the screening signal for screening the output of signal generation unit 121 is to indicate 1 high level signal,
Selecting unit 122 can operate the digital signal D that will be received from amplification shaping unit 130 by logical AND1MCU is output to (not show
Go out) in carry out data processing.When the screening signal for screening the output of signal generation unit 121 is to indicate 0 low level signal, choosing
MCU (not shown) can be output to by logical AND operation by low level signal by selecting unit 122, so as to effectively to receiving
OBU signals screened.
Embodiment 2
Difference lies in the also another structure configuration mode of signal receiving unit 210 is different from embodiment 1 for embodiment 2.
In the present embodiment, signal receiving unit 210 can also be reception device as shown in Figure 2 or circuit.In fig. 2, when passing through
When antenna (not shown) receives OBU signals, the OBU signals can be input into envelope detected unit 216.Envelope detected unit
The envelope of the 216 detection OBU signals, and the envelope signal is input to voltage amplification unit 217, it is received with amplification
Faint envelope signal, so that the RSSI analog signals that the device that the envelope signal becomes thereafter can detect and handle.
Other apparatus structures can refer to embodiment 1.
Embodiment 3
Difference lies in the structure of signal screening unit 320 is different with configuration mode from embodiment 1 for embodiment 3.Fig. 3 a show
Go out another realization method of signal screening unit 320.In this example, signal screening unit 320 may include signal processing unit
326 and signal output determination unit 327.With reference to Fig. 1 a, signal processing unit 326 can receive RSSI from signal receiving unit 110
Analog signal, the digital signal S of the intensity of generation instruction RSSI analog signals, and it is defeated that the digital signal S is output to signal
Go out determination unit 327.As shown in Figure 3b, signal processing unit 326 may include：Detection unit 328 and modulus (AD) converting unit
329。
Detection unit 328 can carry out the RSSI analog signals that are received from signal receiving unit 110 detection, and by RSSI moulds
Plan signal is converted to d. c. voltage signal and is output to AD conversion unit 329, wherein, the voltage value V of the d. c. voltage signal can
To be indicated for the particular voltage level of the intensity of the RSSI analog signals.
AD conversion unit 329 receives the d. c. voltage signal exported from detection unit 328, and by the d. c. voltage signal
A digital signal S is converted to, wherein, the digital signal S may indicate that the voltage value V of the d. c. voltage signal.
Referring again to Fig. 1 a, Fig. 1 b and Fig. 3 a, signal output determination unit 327 can receive defeated from signal processing unit 326
The digital signal S that goes out simultaneously parses it, to determine whether the OBU signals that signal receiving unit 110 receives are useful signals,
So as to further determine whether to receive digital signal D from amplification shaping unit 1301And by digital signal D1MCU is output to (not show
Go out) carry out data processing.In detail, signal output determination unit 327 receives digital signal S and it is parsed, so as to
The voltage value V can be obtained, then, signal output determination unit 327 is by the voltage value V of acquisition compared with predefined threshold value
Compared with if voltage value V is greater than or equal to predefined threshold value, it is determined that the OBU signals that signal receiving unit 110 receives are effective
Signal, therefore, signal output determination unit 327 can receive digital signal D from amplification shaping unit 1301, and by the number of reception
Signal D1MCU (not shown) is output to, to carry out data processing；If voltage value V is less than predefined threshold value, it is determined that signal
The OBU signals that receiving unit 110 receives are not useful signals, and signal output determination unit 327 can not receive digital signal D1, from
And can effectively realize and the OBU signals received are screened, avoid the generation merchandised by mistake.
Other apparatus structures are referring to embodiment 1.
Embodiment 4
With reference to shown in Fig. 1 a, Fig. 4, the OBU signal screening processing methods of the present embodiment, in step S401, signal receives single
Member 110 receives the OBU signals that the OBU from installation in the car is sent, and is converted into the RSSI moulds available for signal processing
Intend signal.
In step S403, amplification shaping unit 130 receives the RSSI analog signals that signal receiving unit 110 exports and to it
Shaping is amplified, can carry out data processing in MCU with generation believes to obtain the OBU of the reception of signal receiving unit 110
The digital signal D of entrained information in number1。
In step S405, signal screening unit 120 receives RSSI analog signals and whole from amplifying from signal receiving unit 110
Shape unit 130 receives the first digital signal, then by being performed an analysis to determine whether to analog signal by digital signal D1It is defeated
Go out to processor to carry out data processing.
Embodiment 5
With reference to shown in Fig. 1 a, Fig. 5, the OBU signal screening processing methods of the present embodiment, in step S501, signal receives single
Member 110 receives the OBU signals that the OBU from installation in the car is sent, and is converted into the RSSI moulds available for signal processing
Intend signal.
In step S503, amplification shaping unit 130 receives the RSSI analog signals that signal receiving unit 110 exports and to it
Shaping is amplified, can carry out data processing in MCU with generation believes to obtain the OBU of the reception of signal receiving unit 110
The digital signal D of entrained information in number1。
In addition, with reference to shown in Fig. 1 b, Fig. 5, in step S503, screening signal generation unit 121 is also from signal receiving unit
110 receive RSSI analog signals, and the signal strength of the signal is compared with predefined threshold value, to determine that signal receives
Whether the OBU signals that unit 110 receives are the OBU signals currently needed transmitted by the vehicle being traded, so as to obtain and defeated
Go out to indicate the screening signal of comparative result.Combined Fig. 1 a and Fig. 1 d be described in detail generate screening signal method, therefore
This will not be described in detail.
In step S505, selecting unit 122 can determine to believe according to the screening signal received from screening signal generation unit 121
Whether number 110 received signal of receiving unit is useful signal, determines whether the digital signal that will be generated in step S503
D1MCU (not shown) is output to carry out further data processing.
If the OBU signals that the screening signal designation signal receiving unit 110 receives are useful signal, in step
S507, selecting unit 122 is by digital signal D1MCU is output to carry out data processing.If the screening signal designation signal
The OBU signals that receiving unit 110 receives are not useful signals, then in step S509, selecting unit 122 can be by low level signal
(or with digital signal D1Other different signals, for example, high level signal) it is output to MCU or in step S509, selection list
Member 122 can not export any signal.It is handled by signal screening as described above, can avoid not handing over this RSU currently
The OBU signals of easy vehicle are input to MCU, and then avoid the generation of transaction by mistake.
Embodiment 6
With reference to shown in Fig. 1 a, Fig. 6, the OBU signal screening processing methods of the present embodiment, in step S601, signal receives single
OBU of the member 110 from installation in the car receives OBU signals, and is converted into the RSSI analog signals available for signal processing.
In step S603, signal processing unit 326 can receive RSSI analog signals from signal receiving unit 110, with generation
It indicates the digital signal S of the intensity of RSSI analog signals, and the digital signal S is output to signal output determination unit 327.
In addition, in step S603, amplification shaping unit 130 receives RSSI analog signals and right from signal receiving unit 110
It is amplified shaping, to generate to carry out the digital signal D of data processing1。
In step S605, signal output determination unit 327 from signal processing unit 326 receive digital signal S and to its into
Row parsing to determine whether 110 received signal of signal receiving unit is useful signal, and thereby further determines whether to receive
Digital signal D1And by digital signal D1MCU (not shown) is output to carry out further data processing.Specifically, signal
Output determination unit 327 receives digital signal S from signal processing unit 326 and it is parsed, so as to obtain instruction RSSI
The voltage value V of the intensity of analog signal, then by the voltage value V compared with predefined threshold value with judge signal receive
Whether the OBU signals that unit 110 receives are useful signals.If voltage value V is greater than or equal to predefined threshold value, signal is defeated
Go out determination unit 327 and can determine that the OBU signals of reception are useful signals, then in step S607, signal output determination unit 327
Digital signal D is received from amplification shaping unit 1301, and by digital signal D1It is further to carry out to be output to MCU (not shown)
Data processing.If voltage value V is less than predefined threshold value, signal output determination unit 327 can determine the OBU signals of reception
It is not useful signal, in step S609, signal output determination unit 327 does not receive digital signal D1。
By as above method, can avoid the OBU signals for the vehicle not being traded with this RSU currently being input to MCU, into
And avoid the generation of transaction by mistake.
Although the present invention, those skilled in the art are particularly shown and described with reference to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention that claim is limited, form can be carried out to it
With the various changes in details.
Claims (2)
1. a kind of board units signal screening method, which is characterized in that the described method includes：
Signal is received from board units, and converts the signals to the analog signal for signal processing；
Shaping is amplified to the analog signal, so as to generate to carry out the first digital signal of data processing；
By performing an analysis to determine whether to export the first digital signal to carry out data processing to the analog signal；
The step of performing an analysis to determine whether to export the first digital signal to carry out data processing to analog signal bag
It includes：
By the signal strength of analog signal compared with the first predetermined threshold value, with determine from board units received signal whether
It is the useful signal currently needed transmitted by the board units being traded, and the screening signal of output indication comparative result；
Determine whether to export the first digital signal according to the screening signal of reception to carry out data processing；
By the signal strength of analog signal compared with the first predetermined threshold value, with determine from board units received signal whether
It is the useful signal currently needed transmitted by the board units being traded, and the step of the screening signal of output indication comparative result
Suddenly include：
When the signal strength of analog signal is greater than or equal to the first predetermined threshold value, the analog signal is converted into the 3rd number
Signal generates the rectified signal with the first DC voltage, according to the inspection with the first DC voltage according to the 3rd digital signal
Ripple signal output high level signal is as screening signal；
When the signal strength of analog signal is less than the first predetermined threshold value, low level signal is generated, is generated according to low level signal
Rectified signal with the second DC voltage, according to the rectified signal output low level signal with the second DC voltage as sieve
Select signal.
2. board units signal screening method as described in claim 1, which is characterized in that
When the signal strength of analog signal is greater than or equal to the first predetermined threshold value, the screening signal designation connects from board units
The signal of receipts is useful signal；
When the signal strength of analog signal is less than the first predetermined threshold value, the letter for screening signal designation and being received from board units
Number it is not useful signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510569985.4A CN105160719B (en) | 2011-08-05 | 2011-08-05 | Roadside unit, board units signal screening system and signal screening method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510569985.4A CN105160719B (en) | 2011-08-05 | 2011-08-05 | Roadside unit, board units signal screening system and signal screening method |
| CN201110223568.6A CN102915571B (en) | 2011-08-05 | 2011-08-05 | Roadside unit, board units signal screening system and signal screening method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110223568.6A Division CN102915571B (en) | 2011-08-05 | 2011-08-05 | Roadside unit, board units signal screening system and signal screening method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105160719A CN105160719A (en) | 2015-12-16 |
| CN105160719B true CN105160719B (en) | 2018-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN104766377B (en) * | 2015-02-11 | 2017-02-01 | 四川蜀路通机电设备安装有限公司 | Frequency conversion identification system with rapid processing function |
| CN104766380A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | Sensing system for ETC |
| CN104766376A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | Novel frequency conversion identification system for ETC |
| CN104766379A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | Radio frequency transceiving system for ETC |
| CN104766381A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | ETC sensing system based on second-order filter circuit |
| CN107370509A (en) * | 2017-07-28 | 2017-11-21 | 广东兴达顺科技有限公司 | A kind of indicating means of signal intensity, detection device and vehicle arrangement |
| CN109474911B (en) * | 2017-09-08 | 2022-04-01 | 睿鑫科技（天津）有限公司 | Method, device and system for communication between vehicle-mounted terminal and road side equipment |
| CN111147164B (en) * | 2019-12-31 | 2022-02-25 | 深圳成谷科技有限公司 | RSSI (received Signal Strength indicator) -based OBU (on-Board Unit) equipment communication range adjusting method and device |
| CN114228554B (en) * | 2021-11-17 | 2024-03-15 | 深圳市金溢科技股份有限公司 | Charging fee deduction method, RSU controller, equipment and medium for electric vehicle |
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| CN102915571A (en) | 2013-02-06 |
| CN102915571B (en) | 2015-09-16 |
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