CN103914883A - 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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- CN103914883A CN103914883A CN201210591934.8A CN201210591934A CN103914883A CN 103914883 A CN103914883 A CN 103914883A CN 201210591934 A CN201210591934 A CN 201210591934A CN 103914883 A CN103914883 A CN 103914883A
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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 embodiment of the present invention relates to electric non-stop toll technical field, particularly relates to a kind of control method and system of roadside device sensitivity.
Background technology
Electric non-stop toll (Electronic Toll Collection, ETC) system is current more advanced Fare Collection System, is one of service function of intelligent transportation system.When ETC system can make vehicular traffic pass through road junction, need not stop, can realize automatic charging, it is particularly suitable for using under the bridge tunnel environment of highway or heavy traffic.
In ETC system, roadside device (Road Side Unit, RSU) on track be responsible for this track in the mobile unit (On board Unit, OBU) installed of vehicle communicate, thereby complete the charge of corresponding vehicle.In ETC system, the sensitivity setting of RSU is an important link, improper if the sensitivity of RSU arranges, RSU may receive the signal that the OBU in other track sends, thereby produces monkey chatter, makes miscommunication, cause Fail Transaction, even cause neighboring trace transaction.
For example, be mainly that two sensitivity are set for RSU at present: receiving sensitivity and cut-off sensitivity, RSU can receive the signal that intensity is greater than receiving sensitivity, can not receive intensity and be less than the signal that ends sensitivity.Therefore,, for the signal that the OBU that ensures normally to receive in this track sends, the signal intensity that the OBU in this track sends is generally greater than receiving sensitivity.But, between above-mentioned receiving sensitivity and cut-off sensitivity, generally there is certain difference, if the signal intensity that the OBU in other track sends is between receiving sensitivity and cut-off sensitivity, RSU still can receive the signal that the OBU in this other track sends, and now can cause monkey chatter.
At present, mainly to realize the control to RSU sensitivity by the signal amplitude of adjustment wave detector output, but, this technology can reduce the quality of output signal, the performance of RSU is produced to larger impact, and the method can not accurately be controlled the sensitivity of RSU, may there is equally the situation of monkey chatter.
Summary of the invention
Embodiment of the present invention technical matters to be solved is to provide a kind of control method and system of roadside device sensitivity, must not accurately control the sensitivity of RSU with solution, causes the problem of monkey chatter.
In order to address the above problem, the invention discloses a kind of control method of roadside device sensitivity, it is characterized in that, comprising:
Set in advance the datum that represents roadside device sensitivity;
Receive the output signal of mobile unit, and described output signal is carried out to detection, obtain rectified signal;
Described rectified signal is carried out to envelope detection, extract the amplitude information of described rectified signal;
Described amplitude information and described datum are compared, obtain comparative result;
Obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out to logical operation;
In the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to useful signal;
In the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
Alternatively, in the time that described datum increases, described roadside device sensitivity increases; In the time that described datum reduces, described roadside device sensitivity reduces.
Alternatively, described described amplitude information and described datum are compared, obtain comparative result, comprising:
By the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtain the Output rusults of comparer;
Using the Output rusults of described comparer as described comparative result.
Alternatively, described comparer is hysteresis loop comparator.
Alternatively, described described digitized signal and described comparative result are carried out to logical operation, comprising:
By described digitized signal and the input of described comparative result and door;
In the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults;
In the time that described and door are not exported, described logical operation does not obtain Output rusults.
On the other hand, the invention also discloses a kind of control system of roadside device sensitivity, it is characterized in that, comprising:
Module is set, for setting in advance the datum that represents 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 to envelope detection, extracts the amplitude information of described rectified signal;
Comparison module, for described amplitude information and described datum are compared, obtains comparative result;
Digital module, for obtaining the digitized signal of described rectified signal;
Computing module, for carrying out logical operation by described digitized signal and described comparative result; In the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to useful signal; In the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
Alternatively, in the time that described datum increases, described roadside device sensitivity increases; In the time that described datum reduces, described roadside device sensitivity reduces.
Alternatively, described comparison module comprises:
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtains the Output rusults of comparer;
Determine submodule, for using the Output rusults of described comparer as described comparative result.
Alternatively, described comparer is hysteresis loop comparator.
Alternatively, described computing module is by described digitized signal and the input of described comparative result and door; In the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults; In the time that described and door are not exported, described logical operation does not obtain Output rusults.
Compared with prior art, the embodiment of the present invention comprises following advantage:
In the embodiment of the present invention by setting in advance the datum that represents roadside device sensitivity, after receiving the output signal of mobile unit, described output signal is carried out to detection, obtain rectified signal, and described rectified signal is carried out to envelope detection, extract the amplitude information of described rectified signal, again described amplitude information and described datum are compared, obtain comparative result, then obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out to logical operation, in the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to effective rectified signal, in the time that logical operation does not obtain Output rusults, using described rectified signal as undesired signal filtering.
The embodiment of the present invention can be by reference to the sensitivity of level control roadside device, datum can a corresponding sensitivity, and do not need to adjust the amplitude of rectified signal, in the time that described datum increases, described roadside device sensitivity increases, in the time that described datum reduces, described roadside device sensitivity reduces, thereby can accurately control sensitivity.If the signal intensity receiving is less than sensitivity, logical operation does not have Output rusults, now think that the output signal that receives mobile unit is undesired signal, thereby by its filtering, therefore in the embodiment of the present invention, roadside device only has a sensitivity, thereby the signal that guarantee roadside device only sends the OBU in this track is processed, and has reduced monkey chatter.
Brief description of the drawings
Fig. 1 is the process flow diagram 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.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Embodiment mono-:
In ETC system, the sensitivity setting of RSU is an important link, improper if the sensitivity of RSU arranges, RSU may receive the signal that the OBU in other track sends, thereby produces monkey chatter, makes miscommunication, cause Fail Transaction, even cause neighboring trace transaction.
At present, be mainly that two sensitivity are set for RSU: receiving sensitivity and cut-off sensitivity.The minimum signal strength of the OBU signal that RSU can stably receive, is called receiving sensitivity, and RSU can receive the signal that intensity is greater than receiving sensitivity; And the maximum signal of the signal that RSU does not receive completely is called cut-off sensitivity, RSU can not receive intensity and is less than the signal that ends sensitivity.Therefore,, for the signal that the OBU that ensures normally to receive in this track sends, the receiving sensitivity of RSU is often wanted the OBU of compatible this track internal power minimum (the signal intensity minimum sending).
But in fact between receiving sensitivity and cut-off sensitivity, generally have certain difference, be less than receiving sensitivity, and be greater than the signal that ends sensitivity for signal intensity, RSU also can receive, and just the bit error rate is larger a little.Therefore, if the signal intensity that the OBU in other track sends between receiving sensitivity and cut-off sensitivity, RSU still can receive the signal that OBU in this other track sends, and now can cause monkey chatter.
For example, in order to carry out arm's length transaction with a low power OBU-A, can be set to-70dBm of the receiving sensitivity of RSU, its cut-off sensitivity is-90dBm, and the intensity of the signal that the OBU-B that in other track, certain emissive power is larger sends is-80dBm, like this, the signal that B sends is just likely received by RSU.If RSU has sent a signal to A, then wait for the signal that receives A, the signal that at this time B sends has come, RSU can respond the signal of B, thereby has missed the signal that A beams back, and will produce like this monkey chatter, cause making a mistake, when serious, even can conclude the business with the B in other track, can cause having detained like this money of B, but A released.
For the problems referred to above, the embodiment of the present invention has proposed a kind of control method of roadside device sensitivity, the method can be eliminated the receiving sensitivity of RSU and end the difference between sensitivity, a RSU sensitivity is only set, thereby can filtered signal intensity be less than the signal of this RSU sensitivity, the signal that only signal intensity is greater than to this RSU sensitivity is processed.
With reference to Fig. 1, show the process flow diagram of the control method of a kind of roadside device sensitivity described in the embodiment of the present invention one, described method can comprise:
Step 100, sets in advance the datum that represents roadside device sensitivity.
In the embodiment of the present invention, can analyze the OBU situation in track, RSU place in advance, and the datum that represents roadside device sensitivity is set according to analysis result, control the sensitivity of RSU, intensity in the signal receiving can be less than to the target signal filter of RSU sensitivity according to this datum, thereby ensure that the signal that RSU is only greater than RSU sensitivity to signal intensity processes.
Therefore, the intensity of the output signal of the OBU in track, RSU place should be greater than the sensitivity of described RSU, and the intensity of the output signal of OBU in other track should be less than the sensitivity of described RSU.
Step 102, receives the output signal of mobile unit, and described output signal is carried out to detection, obtains rectified signal.
First,, when OBU process RSU, by sending the RSU that outputs signal to of OBU, after RSU receives described output signal, can carry out detection to described output signal, thereby obtain rectified signal, follow-up can processing described rectified signal.
In the embodiment of the present invention, can, by by the output signal input wave detector of described OBU, carry out detection by wave detector to described output signal, then wave detector is exportable described rectified signal.
For above-mentioned concrete detection process, those skilled in the art carry out relevant treatment according to practical experience, and the embodiment of the present invention is discussed no longer in detail to this.
Step 104, carries out envelope detection to described rectified signal, extracts the amplitude information of described rectified signal.
After described output signal being carried out to detection through above-mentioned steps 102, in the rectified signal obtaining, can comprise the amplitude information of described rectified signal, and OBU is uploaded to the information of vehicles of RSU, the license plate number information of for example vehicle, the vehicle information of vehicle, etc., the embodiment of the present invention is not limited this.
The embodiment of the present invention can further be carried out envelope detection to described rectified signal, thereby extracts the amplitude information of described rectified signal.For example, described rectified signal can be inputted to envelope detector, thereby obtain the amplitude information of described rectified signal, for concrete envelope detection process, the embodiment of the present invention is discussed no longer 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 described rectified signal according to described comparative result and whether satisfy condition.
In the embodiment of the present invention, can compare described amplitude information and described datum by comparer, concrete, this step 106 can comprise:
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 rusults of comparer;
A2, using the Output rusults of described comparer 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 to logical operation.
After obtaining the amplitude information of above-mentioned rectified signal and the comparative result of described datum, further obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out to logical operation, through after logical operation, can determine whether the output signal of described OBU is useful signal.
In the embodiment of the present invention, can carry out digitizing to described rectified signal by comparer, thereby obtain the digitized signal of described rectified signal, for concrete process, the embodiment of the present invention is discussed no longer in detail at this.
Certainly, can also adopt other modes to carry out digitizing to described rectified signal, the embodiment of the present invention is not limited this.
In the embodiment of the present invention, can carry out logic and operation to described digitized signal and described comparative result, for example, can be by carrying out computing with door.
Concrete, this step 108 can comprise:
B1, by described digitized signal and the input of described comparative result and door;
B2, in the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults;
B3, in the time that described and door are not exported, described logical operation does not obtain Output rusults.
Step 110, in the time that logical operation obtains Output rusults, is defined as useful signal by the digitized signal of described rectified signal.
If described logical operation obtains Output rusults, described Output rusults is the digitized signal of described rectified signal, now, the digitized signal of described rectified signal can be defined as to useful signal, and then the digitized signal of described rectified signal is processed.
For example, the information of vehicles (license plate number information, vehicle information etc.) that can comprise 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 discussed no longer in detail at this.
Step 112, in the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
If described logical operation does not obtain Output rusults, the output signal that described OBU can be described is undesired signal, therefore can, by described output signal filtering, not carry out the processing of above-mentioned calculating charge situation to described output signal.
Therefore, the embodiment of the present invention can be by arranging the sensitivity of value control RSU of different datums, make the receiving sensitivity of RSU and be identical value by sensitivity, thereby signal intensity can be less than to the target signal filter of the sensitivity of described RSU, can ensure that RSU only processes the signal that the OBU in this track sends, the signal that OBU in other track of filtering sends, thus monkey chatter eliminated.
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, show the schematic diagram of the control method of described roadside device sensitivity, this process specifically can comprise:
1, the output signal of described OBU is carried out to detection, obtain the rectified signal that comprises amplitude information.
Certainly, described rectified signal can also comprise other information, routine information of vehicles described above, and the embodiment of the present invention is discussed no longer in detail at this.
At the output signal strength of OBU be for example ,-when 70dBm, rectified signal is the square-wave signal that low and high level is respectively 1.2V and 0.5V; The output signal strength of OBU is-when 75dBm, rectified signal is the square-wave signal that low and high level is respectively 1V and 0.3V; The output signal strength of OBU is-when 80dBm, rectified signal is the square-wave signal that low and high level is respectively 0.8V and 0.1V.
2, rectified signal is carried out to envelope detection, extract the amplitude information of rectified signal.
After above-mentioned rectified signal is carried out to envelope detection, just obtained the envelope information of rectified signal, obtained a level signal, this level signal is exactly the amplitude information of rectified signal.
For above-mentioned example, when be respectively-70dBm of signal intensity ,-75dBm and-when 80dBm, after carrying out envelope detection respectively for these three kinds of signals, the amplitude information obtaining can be respectively 1.2V, 1V and 0.8V.
3, by the in-phase input end of described amplitude information input comparator, with reference to the inverting input of level input comparator.
In the embodiment of the present invention, datum can be obtained or be adjusted by distinct methods, such as obtaining with two electric resistance partial pressures, to adjust the resistance of these two divider resistances and just can adjust reference level value, the embodiment of the present invention is not limited this.
Still describe with above-mentioned example, if reference level value is chosen as 1V, when be greater than-75dBm of signal intensity, the amplitude information of rectified signal is greater than 1V, and the now output of comparer is high level, exports 1; And in the time of be less than-75dBm of signal intensity, the amplitude information of rectified signal is less than 1V, comparer is output low level, exports 0.
4, by obtaining the digitized signal of rectified signal after rectified signal digitizing, then the Output rusults of described digitized signal and comparer is input to and door simultaneously.
In the time that comparer is output as 0, be always 0 with door output; In the time that comparer is output as 1, can export the digitized signal of described rectified signal with door.
In the time of be greater than-75dBm of signal intensity, can export the digitized signal of described rectified signal with door, now, the digitized signal of described rectified signal is useful signal; In the time of be less than-75dBm of signal intensity, be output as 0 (can not obtain Output rusults) with door, now, think that the output signal of OBU is undesired signal, can be by described output signal filtering.Therefore, can learn through above-mentioned analysis, the now sensitivity of RSU can be-75dBm.
5, will be connected with single-chip microcomputer with door.
If export the digitized signal of described rectified signal with door, can carry out computing to the digitized signal of described rectified signal by single-chip microcomputer, for concrete processing procedure, the embodiment of the present invention is discussed no longer in detail; If do not obtain Output rusults with door, single-chip microcomputer is not processed the output signal of described OBU.
If wish to adjust the sensitivity of RSU, can regulate the value of described datum.For example, if be 1.2V with reference to level adjustment, when be greater than-70dBm of signal intensity, the amplitude information of rectified signal is greater than 1.2V, and the now output of comparer is high level, exports 1, and single-chip microcomputer can be received the digitized signal of described rectified signal; And signal intensity is less than-and when 70dBm, the amplitude information of rectified signal is less than 1.2V, and comparer is output low level, exports 0, and single-chip microcomputer can only receive 0.
That is to say, be after 1.2V with reference to level adjustment, just become-70dBm of the sensitivity of system, thus regulate the sensitivity of system.
Therefore, can learn by above-mentioned analysis, in the embodiment of the present invention, in the time that described datum increases, described roadside device sensitivity increases; In the time that described datum reduces, described roadside device sensitivity reduces.
Meanwhile, the uncertainty while equaling datum in order to solve amplitude information, the embodiment of the present invention can become hysteresis loop comparator by described comparator design.Can automatically adjust adaptively the value of described datum according to the amplitude information of rectified signal by hysteresis loop comparator, thereby avoid causing comparer can not export result accurately because datum is identical with described amplitude information.
For the specific works process of hysteresis loop comparator, those skilled in the art's foundation practical experience is carried out relevant treatment, and the embodiment of the present invention is discussed no longer in detail at this.
Certainly, the embodiment of the present invention does not limit the type of described comparer, and other can compare amplitude information and datum, thereby the comparer that obtains accordingly result also can be applied in the embodiment of the present invention.
The embodiment of the present invention can be by reference to the sensitivity of level control roadside device, datum can a corresponding sensitivity, and do not need to adjust the amplitude of rectified signal, in the time that described datum increases, described roadside device sensitivity increases, in the time that described datum reduces, described roadside device sensitivity reduces, thereby can accurately control sensitivity.If the signal intensity receiving is less than sensitivity, logical operation does not have Output rusults, now think that the output signal that receives mobile unit is undesired signal, thereby by its filtering, therefore in the embodiment of the present invention, roadside device only has a sensitivity, thereby the signal that guarantee roadside device only sends the OBU in this track is processed, and has reduced monkey chatter.
Embodiment bis-:
With reference to Fig. 3, the structured flowchart that shows the control system of a kind of roadside device sensitivity described in the embodiment of the present invention two, described system can comprise: module 300, detection module 302, envelope detection module 304, comparison module 306, digital module 308 and computing module 310 are set.
Wherein,
Module 300 is set, for setting in advance the datum that represents roadside device sensitivity;
In the embodiment of the present invention, by regulating described datum, can control the sensitivity of described roadside device, in the time that described datum increases, described roadside device sensitivity increases; In the time that 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 to envelope detection, extracts the amplitude information of described rectified signal;
Comparison module 306, for described amplitude information and described datum are compared, obtains comparative result;
Described comparison module 306 can comprise:
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtains the Output rusults of comparer;
Determine submodule, for using the Output rusults of described comparer as described comparative result.
In the embodiment of the present invention, in order to make comparative result more accurate, can adopt hysteresis loop comparator to compare described amplitude information and datum.
Digital module 308, for obtaining the digitized signal of described rectified signal;
Computing module 310, for carrying out logical operation by described digitized signal and described comparative result; In the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to useful signal; In the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
Concrete, in the embodiment of the present invention, described computing module 310 can be by described digitized signal and the input of described comparative result and door; In the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults; In the time that described and door are not exported, described logical operation does not obtain Output rusults.
In the embodiment of the present invention, after the digitized signal of described rectified signal is defined as to useful signal, can be by the digitized signal input single-chip microcomputer of described rectified signal, can carry out computing to the digitized signal of described rectified signal by single-chip microcomputer, for concrete processing procedure, the embodiment of the present invention is discussed no longer in detail.
For system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Can be by setting in advance the datum that represents roadside device sensitivity in the embodiment of the present invention, after receiving the output signal of mobile unit, described output signal is carried out to detection, obtain rectified signal, and described rectified signal is carried out to envelope detection, extract the amplitude information of described rectified signal, again described amplitude information and described datum are compared, obtain comparative result, then obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out to logical operation, in the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to effective rectified signal, in the time that logical operation does not obtain Output rusults, using described rectified signal as undesired signal filtering.
The embodiment of the present invention can be by reference to the sensitivity of level control roadside device, and do not need to adjust the amplitude of rectified signal, thereby can control more exactly sensitivity.If the signal intensity receiving is less than sensitivity, logical operation does not have Output rusults, now think that the output signal that receives mobile unit is undesired signal, thereby by its filtering, therefore in the embodiment of the present invention, roadside device only has a sensitivity, thereby the signal that guarantee roadside device only sends the OBU in this track is processed, and has reduced monkey chatter.
For aforesaid each embodiment of the method, for simple description, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the present invention is not subject to 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, the embodiment described in instructions all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, commodity or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, commodity or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, commodity or the equipment that comprises described key element and also have other identical element.
Control method to a kind of roadside device sensitivity provided by the present invention and system above, be described in detail, applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a control method for roadside device sensitivity, is characterized in that, comprising:
Set in advance the datum that represents roadside device sensitivity;
Receive the output signal of mobile unit, and described output signal is carried out to detection, obtain rectified signal;
Described rectified signal is carried out to envelope detection, extract the amplitude information of described rectified signal;
Described amplitude information and described datum are compared, obtain comparative result;
Obtain the digitized signal of described rectified signal, and described digitized signal and described comparative result are carried out to logical operation;
In the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to useful signal;
In the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
2. method according to claim 1, is characterized in that,
In the time that described datum increases, described roadside device sensitivity increases;
In the time that described datum reduces, described roadside device sensitivity reduces.
3. method according to claim 1, is characterized in that, described described amplitude information and described datum is compared, and obtains comparative result, comprising:
By the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtain the Output rusults of comparer;
Using the Output rusults of described comparer as described comparative result.
4. method according to claim 3, is characterized in that, described comparer is hysteresis loop comparator.
5. method according to claim 1, is characterized in that, described described digitized signal and described comparative result is carried out to logical operation, comprising:
By described digitized signal and the input of described comparative result and door;
In the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults;
In the time that described and door are not exported, described logical operation does not obtain Output rusults.
6. a control system for roadside device sensitivity, is characterized in that, comprising:
Module is set, for setting in advance the datum that represents 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 to envelope detection, extracts the amplitude information of described rectified signal;
Comparison module, for described amplitude information and described datum are compared, obtains comparative result;
Digital module, for obtaining the digitized signal of described rectified signal;
Computing module, for carrying out logical operation by described digitized signal and described comparative result; In the time that logical operation obtains Output rusults, the digitized signal of described rectified signal is defined as to useful signal; In the time that logical operation does not obtain Output rusults, using described output signal as undesired signal filtering.
7. system according to claim 6, is characterized in that,
In the time that described datum increases, described roadside device sensitivity increases;
In the time that described datum reduces, described roadside device sensitivity reduces.
8. system according to claim 6, is characterized in that, described comparison module comprises:
Input submodule, for by the in-phase input end of described amplitude information input comparator, by the inverting input of described datum input comparator, obtains the Output rusults of comparer;
Determine submodule, for using the Output rusults of described comparer as described comparative result.
9. system according to claim 8, is characterized in that, described comparer is hysteresis loop comparator.
10. system according to claim 6, is characterized in that, described computing module is by described digitized signal and the input of described comparative result and door; In the time that described and door are exported the digitized signal of described rectified signal, described logical operation obtains Output rusults; In the time that described and door are not exported, described logical operation does not obtain Output rusults.
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| CN201210591934.8A CN103914883B (en) | 2012-12-28 | 2012-12-28 | Method and system for controlling sensitivity of road side equipment |
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| CN201210591934.8A CN103914883B (en) | 2012-12-28 | 2012-12-28 | Method and system for controlling sensitivity of road side equipment |
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| CN103914883A true CN103914883A (en) | 2014-07-09 |
| CN103914883B CN103914883B (en) | 2016-06-08 |
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| CN103914883B (en) | 2016-06-08 |
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