CN103914883B - Method and system for controlling sensitivity of road side equipment - Google Patents
Method and system for controlling sensitivity of road side equipment Download PDFInfo
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- CN103914883B CN103914883B CN201210591934.8A CN201210591934A CN103914883B CN 103914883 B CN103914883 B CN 103914883B CN 201210591934 A CN201210591934 A CN 201210591934A CN 103914883 B CN103914883 B CN 103914883B
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Abstract
The embodiment of the invention provides a method and a system for controlling the sensitivity of roadside equipment, which aim to solve the problem of adjacent channel interference caused by the fact that the sensitivity of an RSU cannot be accurately controlled. According to the embodiment of the invention, the sensitivity of the road side equipment can be controlled through the reference level, one reference level can correspond to one sensitivity without adjusting the amplitude of a detection signal, when the reference level is increased, the sensitivity of the road side equipment is increased, and when the reference level is decreased, the sensitivity of the road side equipment is decreased, so that the sensitivity can be accurately controlled. If the received signal strength is smaller than the sensitivity, the logical operation does not output a result, and at the moment, the output signal of the vehicle-mounted equipment is considered to be an interference signal, so that the interference signal is filtered out.
Description
Technical field
The present embodiments relate to electric non-stop toll technical field, particularly relate to control method and the system of a kind of roadside device sensitivity.
Background technology
Electric non-stop toll (ElectronicTollCollection, ETC) system is Fare Collection System more advanced at present, is one of the service function of intelligent transportation system. ETC system can make vehicular traffic need not stop when passing through road junction, is namely capable of automatic charging, and it is particularly suitable under the bridge tunnel environment of highway or heavy traffic to use.
In ETC system, the mobile unit (OnboardUnit, OBU) that the roadside device (RoadSideUnit, RSU) on track is responsible for installing with the vehicle in this track communicates, thus completing the charge of corresponding vehicle. In ETC system, it is an important link that the sensitivity of RSU is arranged, if the sensitivity of RSU arrange improper, then RSU may receive the signal sent of the OBU in other track, thus producing monkey chatter, makes miscommunication, cause Fail Transaction, even cause neighboring trace to conclude the business.
Such as, mainly arranging two sensitivity for RSU at present: receiving sensitivity and cut-off sensitivity, RSU can receive the intensity signal more than receiving sensitivity, it is impossible to receives the intensity signal less than cut-off sensitivity. Therefore, in order to ensure the OBU that can normally receive in this track signal sent, the signal intensity that the OBU in this track sends is generally higher than receiving sensitivity. But, it is usually certain difference between above-mentioned receiving sensitivity and cut-off sensitivity, if the signal intensity that the OBU in other track sends is between receiving sensitivity and cut-off sensitivity, then RSU still can receive the signal sent of the OBU in this other track, now namely can cause monkey chatter.
At present, the control to RSU sensitivity is realized mainly by the signal amplitude adjusting cymoscope output, but, the quality of low-output signal can drop in this technology, the performance of RSU is produced large effect, further, the method can not accurately control the sensitivity of RSU, it is equally possible to there is the situation of monkey chatter.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide control method and the system of a kind of roadside device sensitivity, must not accurately control the sensitivity of RSU, the problem causing monkey chatter with solution.
In order to solve the problems referred to above, the invention discloses the control method of a kind of roadside device sensitivity, it is characterised in that including:
Pre-set the datum representing roadside device sensitivity;
Receive the output signal of mobile unit, and described output signal is carried out detection, obtain rectified signal;
Described rectified signal is carried out envelope detection, extracts the amplitude information of described rectified signal;
Described amplitude information and described datum are compared, obtains comparative result;
Obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out logical operations;
When logical operations obtains output result, the digitized signal of described rectified signal is defined as useful signal;
When logical operations does not obtain output result, using described output signal as disturbing target signal filter.
Alternatively, when described datum increases, described roadside device sensitivity increases; When described datum reduces, described roadside device sensitivity reduces.
Alternatively, described described amplitude information and described datum are compared, obtain comparative result, including:
By the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtain the output result of comparator;
Using the output result of described comparator as described comparative result.
Alternatively, described comparator is hysteresis loop comparator.
Alternatively, described described digitized signal and described comparative result are carried out logical operations, including:
By described digitized signal with the input of described comparative result and door;
When the described digitized signal exporting described rectified signal with door, described logical operations obtains output result;
When described do not export with door time, described logical operations do not obtain output result.
On the other hand, the invention also discloses the control system of a kind of roadside device sensitivity, it is characterised in that including:
Module is set, for pre-setting the datum representing roadside device sensitivity;
Detection module, for receiving the output signal of mobile unit, and carries out detection to described output signal, obtains rectified signal;
Envelope detection module, for described rectified signal is carried out envelope detection, extracts the amplitude information of described rectified signal;
Comparison module, for described amplitude information and described datum being compared, obtains comparative result;
Digital module, for obtaining the digitized signal of described rectified signal;
Computing module, for carrying out logical operations by described digitized signal and described comparative result; When logical operations obtains output result, the digitized signal of described rectified signal is defined as useful signal; When logical operations does not obtain output result, using described output signal as disturbing target signal filter.
Alternatively, when described datum increases, described roadside device sensitivity increases; When described datum reduces, described roadside device sensitivity reduces.
Alternatively, described comparison module includes:
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtaining the output result of comparator;
Determine submodule, for using the output result of described comparator as described comparative result.
Alternatively, described comparator is hysteresis loop comparator.
Alternatively, described digitized signal is inputted and door by described computing module with described comparative result; When the described digitized signal exporting described rectified signal with door, described logical operations obtains output result; When described do not export with door time, described logical operations do not obtain output result.
Compared with prior art, the embodiment of the present invention includes advantages below:
By pre-setting the datum representing roadside device sensitivity in the embodiment of the present invention, after the output signal receiving mobile unit, described output signal is carried out detection, obtain rectified signal, and described rectified signal is carried out envelope detection, extract the amplitude information of described rectified signal, again described amplitude information and described datum are compared, obtain comparative result, then the digitized signal of described rectified signal is obtained, and described digitized signal and described comparative result are carried out logical operations, when logical operations obtains output result, the digitized signal of described rectified signal is defined as effective rectified signal, when logical operations does not obtain output result, using described rectified signal as disturbing target signal filter.
The embodiment of the present invention can be passed through datum and control the sensitivity of roadside device, one datum can a corresponding sensitivity, without the amplitude adjusting rectified signal, when described datum increases, described roadside device sensitivity increases, when described datum reduces, described roadside device sensitivity reduces such that it is able to accurately control sensitivity. If the signal intensity received is less than sensitivity, then logical operations does not export result, now think that the output signal receiving mobile unit is interference signal, thus being filtered, therefore roadside device only one of which sensitivity in the embodiment of the present invention, thus ensureing that the signal sent of the OBU in this track is only processed by roadside device, reduce monkey chatter.
Accompanying drawing explanation
Fig. 1 is the flow chart of the control method of a kind of roadside device sensitivity described in the embodiment of the present invention one;
Fig. 2 is the schematic diagram of the control method of a kind of roadside device sensitivity described in the embodiment of the present invention one;
Fig. 3 is the structured flowchart of the control system of a kind of roadside device sensitivity described in the embodiment of the present invention two.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Embodiment one:
In ETC system, it is an important link that the sensitivity of RSU is arranged, if the sensitivity of RSU arrange improper, then RSU may receive the signal sent of the OBU in other track, thus producing monkey chatter, makes miscommunication, cause Fail Transaction, even cause neighboring trace to conclude the business.
Currently for RSU, mainly two sensitivity are set: receiving sensitivity and cut-off sensitivity. The minimum signal strength of the OBU signal that RSU can stably receive, is called receiving sensitivity, and namely RSU can receive the intensity signal more than receiving sensitivity; And the maximum signal of the signal that RSU does not receive completely, then it is called cut-off sensitivity, namely RSU can not receive the intensity signal less than cut-off sensitivity. Therefore, in order to ensure the OBU that can normally receive in this track signal sent, the receiving sensitivity of RSU often wants the OBU of this track internal power compatible minimum (signal intensity namely sent is minimum).
But being actually usually certain difference between receiving sensitivity and cut-off sensitivity, for signal intensity less than receiving sensitivity, and more than the signal of cut-off sensitivity, RSU is also able to receive, and simply the bit error rate is slightly larger. Therefore, if the signal intensity that the OBU in other track sends is between receiving sensitivity and cut-off sensitivity, then RSU still can receive the signal sent of the OBU in this other track, now namely can cause monkey chatter.
Such as, in order to carry out arm's length dealing with a low power OBU-A, the receiving sensitivity of RSU could be arranged to-70dBm, its cut-off sensitivity is-90dBm, and the intensity of the signal that the OBU-B that in other track, certain transmitting power is bigger sends is-80dBm, so, the signal that B sends is possible to be received by RSU. If RSU have issued a signal to A, the signal of A to be received such as then, the signal that at this time B sends comes, RSU then can respond the signal of B, thus missing the A signal beamed back, thus can produce monkey chatter, cause making a mistake, even can be traded with the B in other track time serious, so can cause the money having detained B, but A be released.
For the problems referred to above, the embodiment of the present invention proposes the control method of a kind of roadside device sensitivity, the method can eliminate the difference between the receiving sensitivity of RSU and cut-off sensitivity, namely one RSU sensitivity is only set, such that it is able to filtered signal intensity is less than the signal of this RSU sensitivity, only signal intensity is processed more than the signal of this RSU sensitivity.
With reference to Fig. 1, it is shown that the flow chart of the control method of a kind of roadside device sensitivity described in the embodiment of the present invention one, described method may include that
Step 100, pre-sets the datum representing roadside device sensitivity.
In the embodiment of the present invention, in advance the OBU situation in track, RSU place can be analyzed, and the datum representing roadside device sensitivity is set according to analyzing result, control the sensitivity of RSU, according to this datum can by the target signal filter less than RSU sensitivity of the intensity in the signal that receives, thus ensureing that signal intensity is only processed by RSU more than the signal of RSU sensitivity.
Therefore, the OBU in track, RSU place output signal intensity should more than the sensitivity of described RSU, and the OBU in other track output signal intensity should less than the sensitivity of described RSU.
Step 102, receives the output signal of mobile unit, and described output signal is carried out detection, obtain rectified signal.
First, OBU through RSU, outputs signal to after RSU, RSU receive described output signal by what send OBU, it is possible to described output signal is carried out detection, thus obtaining rectified signal, follow-up can described rectified signal be processed.
The embodiment of the present invention can be passed through inputted in cymoscope by the output signal of described OBU, by cymoscope, described output signal be carried out detection, then cymoscope and exportable described rectified signal.
For above-mentioned concrete detection process, those skilled in the art carry out relevant treatment according to practical experience, and this is no longer discussed in detail by the embodiment of the present invention.
Step 104, carries out envelope detection to described rectified signal, extracts the amplitude information of described rectified signal.
After described output signal is carried out detection by above-mentioned steps 102, the rectified signal obtained can include the amplitude information of described rectified signal, and OBU is uploaded to the information of vehicles of RSU, the license plate number information of such as vehicle, vehicle vehicle information, etc., this is not any limitation as by the embodiment of the present invention.
Described rectified signal can be carried out envelope detection by the embodiment of the present invention further, thus extracting the amplitude information of described rectified signal. For example, it is possible to described rectified signal is inputted envelope detector, thus obtaining the amplitude information of described rectified signal, for concrete envelope detection process, the embodiment of the present invention is no longer discussed in detail at this.
Step 106, compares described amplitude information and described datum, obtains comparative result.
In the embodiment of the present invention, after obtaining the amplitude information of described rectified signal, described amplitude information and described datum can be compared, obtain comparative result, then can detect whether described rectified signal satisfies condition according to described comparative result.
In the embodiment of the present invention, it is possible to by comparator, described amplitude information and described datum being compared, concrete, this step 106 may include that
A1, by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtains the output result of comparator;
A2, using the output result of described comparator as described comparative result.
Step 108, obtains the digitized signal of described rectified signal, and described digitized signal and described comparative result is carried out logical operations.
After the comparative result of the amplitude information Yu described datum that obtain above-mentioned rectified signal, obtain the digitized signal of described rectified signal further, and described digitized signal and described comparative result are carried out logical operations, after logical operations, namely can determine that whether the output signal of described OBU is useful signal.
In the embodiment of the present invention, it is possible to by comparator, described rectified signal is digitized, thus obtaining the digitized signal of described rectified signal, for concrete process, the embodiment of the present invention is no longer discussed in detail at this.
It is, of course, also possible to adopt other modes that described rectified signal is digitized, this is not any limitation as by the embodiment of the present invention.
In the embodiment of the present invention, it is possible to described digitized signal and described comparative result are carried out logic and operation, for instance, it is possible to by carrying out computing with door.
Concrete, this step 108 may include that
B1, by described digitized signal with the input of described comparative result and door;
B2, when the described digitized signal exporting described rectified signal with door, described logical operations obtains output result;
B3, when described do not export with door time, described logical operations do not obtain output result.
Step 110, when logical operations obtains output result, is defined as useful signal by the digitized signal of described rectified signal.
If described logical operations obtains output result, then described output result is the digitized signal of described rectified signal, now, the digitized signal of described rectified signal can be defined as useful signal, then again the digitized signal of described rectified signal be processed.
For example, it is possible to the information of vehicles (license plate number information, vehicle information etc.) included according to described rectified signal calculates the charge situation for this vehicle, then described vehicle is charged. For concrete processing procedure, those skilled in the art carry out relevant treatment according to practical experience, and the embodiment of the present invention is no longer discussed in detail at this.
Step 112, when logical operations does not obtain output result, using described output signal as disturbing target signal filter.
If described logical operations does not obtain output result, then can illustrate that the output signal of described OBU is interference signal, therefore by described output target signal filter, described output signal can not carried out the process of above-mentioned calculating charge situation.
Therefore, the embodiment of the present invention can pass through to arrange the sensitivity of the value control RSU of different datums, make RSU receiving sensitivity and by sensitivity be identical value, such that it is able to by the target signal filter of the signal intensity sensitivity less than described RSU, namely can ensure that the RSU OBU only processing in this track signal sent, filter the signal sent of the OBU in other track, thus eliminating monkey chatter.
Below, in conjunction with Fig. 2, by a concrete example, the control method of the roadside device sensitivity described in the embodiment of the present invention is introduced.
With reference to Fig. 2, it is shown that the schematic diagram of the control method of described roadside device sensitivity, this process specifically may include that
1, the output signal of described OBU is carried out detection, obtain comprising the rectified signal of amplitude information.
Certainly, described rectified signal can also include other information, for instance above-mentioned information of vehicles, the embodiment of the present invention is no longer discussed in detail at this.
Such as, when the output signal strength of OBU is-70dBm, rectified signal is the square-wave signal of low and high level respectively 1.2V and 0.5V; When the output signal strength of OBU is-75dBm, rectified signal is the square-wave signal of low and high level respectively 1V and 0.3V; When the output signal strength of OBU is-80dBm, rectified signal is the square-wave signal of low and high level respectively 0.8V and 0.1V.
2, rectified signal is carried out envelope detection, extract the amplitude information of rectified signal.
After above-mentioned rectified signal is carried out envelope detection, just obtaining the envelope information of rectified signal, namely obtain a level signal, this level signal is exactly the amplitude information of rectified signal.
For above-mentioned example, as signal intensity respectively-70dBm ,-75dBm and-80dBm, after carrying out envelope detection respectively for these three signal, the amplitude information obtained can respectively 1.2V, 1V and 0.8V.
3, by the in-phase input end of described amplitude information input comparator, by the inverting input of datum input comparator.
In the embodiment of the present invention, datum can be by distinct methods and obtains or be adjusted, such as can obtaining with two electric resistance partial pressures, the resistance adjusting the two divider resistance just can adjust reference level value, and this is not any limitation as by the embodiment of the present invention.
Still illustrating with above-mentioned example, if reference level value is chosen as 1V, then when signal intensity is more than-75dBm, the amplitude information of rectified signal is more than 1V, and the now output of comparator is then high level, namely exports 1; And when signal intensity is less than-75dBm, the amplitude information of rectified signal less than 1V, comparator then output low level, namely export 0.
4, the digitized signal of rectified signal will be obtained after rectified signal digitized, then the output result of described digitized signal Yu comparator is input simultaneously to and door.
When comparator is output as 0, it is always 0 with door output; When comparator is output as 1, the digitized signal of described rectified signal then can be exported with door.
Namely, when signal intensity is more than-75dBm, with the digitized signal that door can export described rectified signal, now, the digitized signal of described rectified signal is useful signal; When signal intensity is less than-75dBm, it is output as 0 (namely can not obtain output result) with door, now, then it is assumed that the output signal of OBU is interference signal, it is possible to by described output target signal filter. Therefore, through above-mentioned analysis it is known that the now sensitivity of RSU can be-75dBm.
5, will be attached with door and single-chip microcomputer.
If with the digitized signal that door exports described rectified signal, then can pass through single-chip microcomputer and the digitized signal of described rectified signal is calculated process, for concrete processing procedure, the embodiment of the present invention is no longer discussed in detail; If do not obtain output result with door, then the output signal of described OBU is not processed by single-chip microcomputer.
It is it desired to adjust the sensitivity of RSU, then can regulate the value of described datum. Such as, if datum is adjusted to 1.2V, then when signal intensity is more than-70dBm, the amplitude information of rectified signal is more than 1.2V, and the now output of comparator is then high level, namely exports 1, and single-chip microcomputer can receive the digitized signal of described rectified signal; And signal intensity less than-70dBm time, the amplitude information of rectified signal less than 1.2V, comparator then output low level, namely export 0, single-chip microcomputer can only receive 0.
It is to say, after datum is adjusted to 1.2V, the sensitivity of system has reformed into-70dBm, thus have adjusted the sensitivity of system.
Therefore, by above-mentioned analysis it is known that in the embodiment of the present invention when described datum increases, described roadside device sensitivity increases; When described datum reduces, described roadside device sensitivity reduces.
Meanwhile, uncertainty during in order to solve amplitude information equal to datum, described comparator design can be become hysteresis loop comparator by the embodiment of the present invention. The value of described datum can be adjusted adaptively automatically according to the amplitude information of rectified signal, thus avoiding causing that comparator can not export result accurately owing to datum is identical with described amplitude information by hysteresis loop comparator.
For the specific works process of hysteresis loop comparator, those skilled in the art's foundation practical experience carries out relevant treatment, and the embodiment of the present invention is no longer discussed in detail at this.
Certainly, the embodiment of the present invention does not limit the type of described comparator, and amplitude information and datum can be compared by other, thus the comparator obtaining accordingly result also can apply in the embodiment of the present invention.
The embodiment of the present invention can be passed through datum and control the sensitivity of roadside device, one datum can a corresponding sensitivity, without the amplitude adjusting rectified signal, when described datum increases, described roadside device sensitivity increases, when described datum reduces, described roadside device sensitivity reduces such that it is able to accurately control sensitivity. If the signal intensity received is less than sensitivity, then logical operations does not export result, now think that the output signal receiving mobile unit is interference signal, thus being filtered, therefore roadside device only one of which sensitivity in the embodiment of the present invention, thus ensureing that the signal sent of the OBU in this track is only processed by roadside device, reduce monkey chatter.
Embodiment two:
With reference to Fig. 3, illustrating the structured flowchart of the control system of a kind of roadside device sensitivity described in the embodiment of the present invention two, described system may include that and arranges module 300, detection module 302, envelope detection module 304, comparison module 306, digital module 308 and computing module 310.
Wherein,
Module 300 is set, for pre-setting the datum representing roadside device sensitivity;
In the embodiment of the present invention, by regulating described datum, it is possible to control the sensitivity of described roadside device, when described datum increases, described roadside device sensitivity increases;When described datum reduces, described roadside device sensitivity reduces.
Detection module 302, for receiving the output signal of mobile unit, and carries out detection to described output signal, obtains rectified signal;
Envelope detection module 304, for described rectified signal is carried out envelope detection, extracts the amplitude information of described rectified signal;
Comparison module 306, for described amplitude information and described datum being compared, obtains comparative result;
Described comparison module 306 may include that
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtaining the output result of comparator;
Determine submodule, for using the output result of described comparator as described comparative result.
In the embodiment of the present invention, in order to make comparative result more accurate, it is possible to adopt hysteresis loop comparator that described amplitude information and datum are compared.
Digital module 308, for obtaining the digitized signal of described rectified signal;
Computing module 310, for carrying out logical operations by described digitized signal and described comparative result; When logical operations obtains output result, the digitized signal of described rectified signal is defined as useful signal; When logical operations does not obtain output result, using described output signal as disturbing target signal filter.
Concrete, in the embodiment of the present invention, described digitized signal can be inputted and door by described computing module 310 with described comparative result; When the described digitized signal exporting described rectified signal with door, described logical operations obtains output result; When described do not export with door time, described logical operations do not obtain output result.
In the embodiment of the present invention, after the digitized signal of described rectified signal is defined as useful signal, the digitized signal of described rectified signal can be inputted single-chip microcomputer, can be calculated processing to the digitized signal of described rectified signal by single-chip microcomputer, for concrete processing procedure, the embodiment of the present invention is no longer discussed in detail.
For system embodiment, due to itself and embodiment of the method basic simlarity, so what describe is fairly simple, relevant part illustrates referring to the part of embodiment of the method.
The embodiment of the present invention can be passed through pre-set the datum representing roadside device sensitivity, after the output signal receiving mobile unit, described output signal is carried out detection, obtain rectified signal, and described rectified signal is carried out envelope detection, extract the amplitude information of described rectified signal, again described amplitude information and described datum are compared, obtain comparative result, then the digitized signal of described rectified signal is obtained, and described digitized signal and described comparative result are carried out logical operations, when logical operations obtains output result, the digitized signal of described rectified signal is defined as effective rectified signal, when logical operations does not obtain output result, using described rectified signal as disturbing target signal filter.
The embodiment of the present invention can be passed through datum and control the sensitivity of roadside device, without the amplitude adjusting rectified signal such that it is able to control sensitivity more exactly. If the signal intensity received is less than sensitivity, then logical operations does not export result, now think that the output signal receiving mobile unit is interference signal, thus being filtered, therefore roadside device only one of which sensitivity in the embodiment of the present invention, thus ensureing that the signal sent of the OBU in this track is only processed by roadside device, reduce monkey chatter.
For aforesaid each embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously. Secondly, those skilled in the art also should know, embodiment described in this description belongs to preferred embodiment, necessary to involved action and the module not necessarily present invention.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially. And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, commodity or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, commodity or equipment. When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, commodity or equipment.
Above to the control method of a kind of roadside device sensitivity provided by the present invention and system, it is described in detail, principles of the invention and embodiment are set forth by specific case used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention; Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, all will change in specific embodiments and applications, in sum, this specification content should not be construed as limitation of the present invention.
Claims (8)
1. the control method of a roadside device sensitivity, it is characterised in that including:
Pre-set the datum representing roadside device sensitivity;
Receive the output signal of mobile unit, and described output signal is carried out detection, obtain rectified signal;
Described rectified signal is carried out envelope detection, extracts the amplitude information of described rectified signal;
Described amplitude information and described datum are compared, obtains comparative result;
Obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out logical operations;
When logical operations obtains output result, the digitized signal of described rectified signal is defined as useful signal;
When logical operations does not obtain output result, using described output signal as disturbing target signal filter;
Wherein, described described amplitude information and described datum are compared, obtain comparative result, including:
By the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtain the output result of comparator;
Using the output result of described comparator as described comparative result.
2. method according to claim 1, it is characterised in that
When described datum increases, described roadside device sensitivity increases;
When described datum reduces, described roadside device sensitivity reduces.
3. method according to claim 1, it is characterised in that described comparator is hysteresis loop comparator.
4. method according to claim 1, it is characterised in that described described digitized signal and described comparative result are carried out logical operations, including:
By described digitized signal with the input of described comparative result and door;
When the described digitized signal exporting described rectified signal with door, described logical operations obtains output result;
When described do not export with door time, described logical operations do not obtain output result.
5. the control system of a roadside device sensitivity, it is characterised in that including:
Module is set, for pre-setting the datum representing roadside device sensitivity;
Detection module, for receiving the output signal of mobile unit, and carries out detection to described output signal, obtains rectified signal;
Envelope detection module, for described rectified signal is carried out envelope detection, extracts the amplitude information of described rectified signal;
Comparison module, for described amplitude information and described datum being compared, obtains comparative result;
Digital module, for obtaining the digitized signal of described rectified signal;
Computing module, for carrying out logical operations by described digitized signal and described comparative result; When logical operations obtains output result, the digitized signal of described rectified signal is defined as useful signal; When logical operations does not obtain output result, using described output signal as disturbing target signal filter;
Wherein, described comparison module includes:
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtaining the output result of comparator;
Determine submodule, for using the output result of described comparator as described comparative result.
6. system according to claim 5, it is characterised in that
When described datum increases, described roadside device sensitivity increases;
When described datum reduces, described roadside device sensitivity reduces.
7. system according to claim 5, it is characterised in that described comparator is hysteresis loop comparator.
8. system according to claim 5, it is characterised in that described digitized signal is inputted and door by described computing module with described comparative result; When the described digitized signal exporting described rectified signal with door, described logical operations obtains output result; When described do not export with door time, described logical operations do not obtain output result.
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| US5933096A (en) * | 1997-01-17 | 1999-08-03 | Mitsubishi Denki Kabushiki Kaisha | Non-stop automatic toll collection system |
| JP3466129B2 (en) * | 1999-08-23 | 2003-11-10 | 松下電器産業株式会社 | Automatic toll collection system |
| JP3698948B2 (en) * | 2000-03-28 | 2005-09-21 | 三菱電機株式会社 | DSRC OBE |
| JP4659638B2 (en) * | 2006-02-17 | 2011-03-30 | Ｏｋｉセミコンダクタ株式会社 | Data transmitting / receiving apparatus and control method thereof |
| KR101016938B1 (en) * | 2008-03-05 | 2011-02-25 | (주)에프씨아이 | Electrical toll collection system with terminal limiting communication zone |
| CN101742538B (en) * | 2009-12-01 | 2012-12-12 | 北京握奇智能科技有限公司 | Method, device and system for controlling communication power |
| CN202142111U (en) * | 2011-08-05 | 2012-02-08 | 深圳市金溢科技有限公司 | Road side unit and on-bus unit signal screening system |
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