CN102903156A - Roadside unit performing synchronization based on integrated pulse width modulation output and synchronization method - Google Patents
Roadside unit performing synchronization based on integrated pulse width modulation output and synchronization method Download PDFInfo
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Abstract
The invention provides a roadside unit performing synchronization based on integrated pulse width modulation output and a synchronization method. The roadside unit comprises a setting module, a pulse width modulation output module and a signal output converting module. The setting module is used for setting the roadside unit as a master control roadside unit or a non-master-control roadside unit. The pulse width modulation output module is disposed on a processor of the roadside unit. When the roadside unit is set as the master control roadside unit by the setting module, the pulse width modulation output module generates a first synchronization signal and outputs the signal to the signal output converting module, the signal output converting module receives the first synchronization signal, converts the first synchronization signal into a second synchronization signal, and outputs the second synchronization signal to a non-master-control roadside unit, and the non-master-control roadside unit performs synchronization according to the second synchronization signal.
Description
Technical field
The present invention relates to intelligent transportation field, more particularly, relate to roadside unit (RSU, Road Side Unit) synchronizer and method in a kind of electric non-stop toll (ETC, Electronic Toll Collection) lane system.
Background technology
The ETC system is a kind of when vehicle process charge station, can in the situation that need not to stop, identify and carry out the system of automatic fee to vehicle.Usually, use the charge station of ETC system a plurality of roadside units to be set at the lane in which the drivers should pay fees, to read the data such as vehicle identification code and data are carried out pre-service, the data processing unit that then sends the data to charge station is realized automatic charging.
Yet, in present vehicle management is identified automatically, because the existence of monkey chatter, may cause and repeat to charge or the situation of charge not, therefore need between a plurality of roadside units, carry out synchronous collaboration, finish transaction between vehicle and the charge station can select correct roadside unit among a plurality of roadside units.
At present, the method of synchronization that is applied to the ETC field normally is equipped with an independently synchronizer for the roadside unit in each ETC track, perhaps independently synchronizer is integrated in the roadside unit, synchronizing signal is by wherein producing as synchronizer of master control or extra circuit, and other synchronizers receive this synchronizing signal as slave, this so that the cost of roadside unit greatly increase, and need networking and the extra network equipment between the synchronizer, so the adding of synchronizer integrated cost and the complexity of ETC system have also been increased.In addition, owing to adopt independent synchronizer or additional circuit to produce synchronizing signal, need to realize signal frequency by extra communication, control interface that the isoparametric adjustment of dutycycle is so that the synchronous complicated between the roadside unit.Therefore, need to a kind ofly can make more simply, rapidly the synchronous method and apparatus of a plurality of roadside units.
Summary of the invention
Carry out synchronous roadside unit (RSU) according to the invention provides a kind of output based on integrated pulse width modulation, described roadside unit comprises: module is set, is used for described roadside unit and is set to master control roadside unit or non-master control roadside unit; The width modulation output module is arranged on the processor of described roadside unit; And signal output modular converter, wherein, when the described roadside unit of module being set being set to the master control roadside unit, the width modulation output module produces the first synchronizing signal, and first synchronizing signal that will produce outputs to signal output modular converter, signal output modular converter receives the first synchronizing signal, the first synchronizing signal that receives is converted to the second synchronizing signal, and the second synchronizing signal outputed to non-master control roadside unit, from but not the master control roadside unit uses described the second synchronizing signal to carry out synchronously.
Preferably, when the described roadside unit of module being set being set to the master control roadside unit, described roadside unit can directly read from processor inside the first synchronizing signal that the width modulation output module produces to carry out synchronously.
Preferably, described roadside unit also can comprise: the external interrupt module is arranged on the processor of described roadside unit; And signal input modular converter, wherein, when the described roadside unit of module being set being set to non-master control roadside unit, signal input modular converter receives the second synchronizing signal from the master control roadside unit, the second synchronizing signal is converted to the first synchronizing signal, and described the first synchronizing signal is input to the external interrupt module, the external interrupt module receives from the first synchronizing signal of signal input modular converter output, and uses the first synchronizing signal to carry out synchronously.
Preferably, described roadside unit also can comprise: signal input selection module and be integrated in external interrupt module on the processor that is integrated with the width modulation output module, wherein, when the described roadside unit of module being set being set to the master control roadside unit: signal input selection module is according to the channel selecting signal of processor output, reception from the first synchronizing signal of width modulation output module output as inner synchronousing signal, and first synchronizing signal that will receive is input to the external interrupt module, the external interrupt module receives from the first synchronizing signal of signal input selection module output, and uses the first synchronizing signal that receives to process synchronously.
Preferably, described roadside unit also can comprise signal input modular converter, when the described roadside unit of module being set being set to non-master control roadside unit, signal input modular converter receives the second synchronizing signal from the master control roadside unit, the second synchronizing signal that receives is converted to the first synchronizing signal, and the first synchronizing signal is input to signal input selection module, signal input selection module is according to the channel selecting signal from processor output, reception is from the first synchronizing signal of signal input modular converter output, and first synchronizing signal that will receive is input to the external interrupt module; The external interrupt module receives from the first synchronizing signal of signal input selection module output, and uses the first synchronizing signal that receives to carry out synchronously.
Preferably, described channel selecting signal can be set to the master control roadside unit also be that non-master control roadside unit is relevant with the described roadside unit of module is set.
Provide a kind of roadside unit (RSU) method for synchronous based on integrated pulse width modulation output according to another object of the present invention, described method comprises: determine that it also is non-master control roadside unit that roadside unit is set to the master control roadside unit; If roadside unit is set to the master control roadside unit, then described roadside unit produces the first synchronizing signal, the first synchronizing signal that produces is converted to the second synchronizing signal, and the second synchronizing signal outputed to non-master control roadside unit, from but not the master control roadside unit uses described the second synchronizing signal to carry out synchronously; If roadside unit is set to non-master control roadside unit, then described roadside unit receives the second synchronizing signal from the master control roadside unit, the second synchronizing signal that receives is converted to the first synchronizing signal, and uses the first synchronizing signal to carry out synchronously.
Preferably, when described roadside unit is set to the master control roadside unit, can by directly reading the first synchronizing signal of generation from the processor inside of described roadside unit, realize the synchronous of described roadside unit.
Preferably, when described roadside unit is set to the master control roadside unit, can according to channel selecting signal, realize the synchronous of described roadside unit from the outside reception of processor and with the first synchronizing signal that described roadside unit produces.
Preferably, when described roadside unit is set to non-master control roadside unit, can according to channel selecting signal, use the first synchronizing signal that obtains from the second synchronizing signal conversion of master control roadside unit reception to realize the synchronous of described roadside unit.
Preferably, can be set to the master control roadside unit with described roadside unit also be that non-master control roadside unit is relevant to described channel selecting signal.
Will be in ensuing description part set forth the present invention other aspect and/or advantage, some will be clearly by describing, and perhaps can learn through enforcement of the present invention.
Export (PWMO according to the width modulation that the processor in the use roadside unit of the present invention carries, Pulse Width Modulation Output) module produces the synchronizing signal method, can be in the situation that does not need extra independent signal generation or signal generating circuit, realize between a plurality of roadside units synchronously.In addition, the present invention can improve device integration, reduces equipment volume, thereby reduces equipment cost.In addition, owing to the PWMO module can be worked independently, so the work of the generation of synchronizing signal and processor cores can not influence each other.
Description of drawings
Fig. 1 is the block diagram that illustrates according to the configuration of the roadside unit of embodiments of the invention 1.
Fig. 2 is the oscillogram that illustrates according to the synchronizing signal of embodiments of the invention 1.
Fig. 3 is the synoptic diagram that illustrates according to the duty of the roadside unit that is set to master mode of embodiments of the invention 1.
Fig. 4 is the synoptic diagram that illustrates according to the duty of the roadside unit that is set to non-master mode of embodiments of the invention 1.
Fig. 5 is the block diagram that illustrates according to the configuration of the roadside unit of embodiments of the invention 2.
Fig. 6 is the synoptic diagram that illustrates according to the duty of the roadside unit that is set to master mode of embodiments of the invention 2.
Fig. 7 is the synoptic diagram that illustrates according to the duty of the roadside unit that is set to non-master mode of embodiments of the invention 2.
Fig. 8 is the process flow diagram that illustrates according to the roadside unit method for synchronous of embodiments of the invention 2.
Embodiment
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention, characteristics and advantage will become apparent, below, roadside unit is called for short RSU.
Embodiment 1
As shown in Figure 1, the RSU1 of present embodiment comprises: processor 10, signal output modular converter 20, signal are inputted modular converter 30 and module 50 are set.
Described RSU1 can be set to master mode RSU (below, referred to as master control RSU) to produce synchronizing signal, and the synchronizing signal that produces sent to the RSU that is set to non-master mode (below, referred to as non-master control RSU), thereby realize between a plurality of RSU synchronously.On the other hand, described RSU1 also can be set to non-master control RSU, and receives synchronizing signal and do not need self to produce synchronizing signal from master control RSU, thus with the synchronizing signal that receives finish and other RSU between synchronous.That is to say that master control RSU produces synchronizing signal, and use self synchronizing signal carry out with other RSU synchronously; But not master control RSU does not produce synchronizing signal, receive only synchronizing signal that master control RSU sends finish with other RSU synchronously.
In addition, can manually select RSU1 to be set to the RSU of master mode or non-master mode, perhaps can select RSU1 to be set to the RSU of master mode or non-master mode according to predefined condition.
With reference to Fig. 1, module 50 is set is set to master control RSU or non-master control RSU according to user's selection RSU1.Processor 10 is internal processors of RSU1, is used for the overall operation of control RSU1, and for example, the data pre-service, control RSU1 is operated in master mode or non-master mode is inferior.In processor 10, be integrated with PWMO module 11 and external interrupt module 12.
By PWMO module 11 and the external interrupt module 12 of utilizing processor 10 to carry, RSU1 can easily realize with synchronizing signal synchronously.Below will describe the synchronous process that realizes in detail.
When module 50 RSU1 being set being set to master mode, signal output modular converter 20 receives from PWMO module 11 and produces and the Transistor-Transistor Logic level synchronizing signal of output.Because the Transistor-Transistor Logic level synchronizing signal also is not suitable for the transmission of long distance, therefore, according to present embodiment, signal output modular converter 20 will be converted to from the Transistor-Transistor Logic level synchronizing signal that PWMO module 11 receives be suitable for long Distance Transmission outer synchronous signal (for example, RS485 signal etc.), and via wired mode or wireless mode, described outer synchronous signal is sent to other non-master control RSU in the charge station.Non-master control RSU processes synchronously with the outer synchronous signal that receives.
When module 50 RSU1 being set being set to non-master mode, via wired mode or wireless mode, signal input modular converter 30 receives the outer synchronous signal that the master control RSU from charge station sends, the outer synchronous signal that receives is converted to is suitable for the Transistor-Transistor Logic level synchronizing signal that interrupt module 12 processes are externally processed, then the external interrupt module 12 that described Transistor-Transistor Logic level synchronizing signal is input in the processor 10 is processed, thereby realizes synchronously.
Fig. 3 is the synoptic diagram according to the duty of the RSU1 that is set to master mode of exemplary embodiment 1 of the present invention.
As shown in Figure 3, in the present embodiment, when when module 50 RSU1 being set being set to master mode, PWMO module 11 and 20 work of signal output modular converter, and external interrupt module 12 and signal input modular converter 30 can not worked.Under the control of processor 10, PWMO module 11 in the processor 10 produces the Transistor-Transistor Logic level synchronizing signal with characteristic frequency and dutycycle, and the Transistor-Transistor Logic level synchronizing signal that produces outputed to signal output modular converter 20, signal output modular converter 20 is converted to the outer synchronous signal that is suitable for long Distance Transmission with the Transistor-Transistor Logic level synchronizing signal that receives, and via wired mode or wireless mode described outer synchronous signal is sent to non-master control RSU.Non-master control RSU carries out with described outer synchronous signal synchronously.
In addition, in this embodiment, described master control RSU1 can be undertaken by the Transistor-Transistor Logic level synchronizing signal that directly reads 11 generations of PWMO module from processor inside synchronously.That is to say because the same synchronizing signal of using same PWMO module to produce, a plurality of RSU in the charge station can easily realize each other synchronously.
Fig. 4 is the synoptic diagram of duty that is set to the RSU1 of non-master mode.As shown in Figure 4, in the present embodiment, when when module 50 RSU1 being set being set to non-master mode, external interrupt module 12 and 30 work of signal input modular converter, and PWMO module 11 and signal output modular converter 20 can not worked.Via wired mode or wireless mode, signal input modular converter 30 receives the outer synchronous signal that sends from the master control RSU of outside, and the outer synchronous signal that receives is converted to the Transistor-Transistor Logic level synchronizing signal.Then, this Transistor-Transistor Logic level synchronizing signal is outputed in the external interrupt module 12 in the processor 10.By the Transistor-Transistor Logic level synchronizing signal that use receives, external interrupt module 12 is processed synchronously in the mode of external interrupt.Having described in conjunction with Fig. 1 uses the Transistor-Transistor Logic level synchronizing signal to carry out synchronous method, and coming the synchronous method between the finishing equipment with various types of synchronizing signals is known for a person skilled in the art, therefore will be not described in detail at this.
As shown in Figure 5, in the present embodiment, RSU2 comprises processor 10, signal output modular converter 20, signal input modular converter 30, signal input selection module 40 and module 50 is set.Be with the difference of embodiment 1, in the present embodiment, when RSU2 is set to master mode, the synchronizing signal that produces by the outside reading processor 10 from processor 10, rather than the synchronizing signal that directly reads generation from processor 10 inside is processed synchronously.
Signal shown in Fig. 5 output modular converter 20, signal input modular converter 30 and module 50 and signal output modular converter 20, the signal input modular converter 30 shown in Fig. 1 are set and module 50 is set identical so will omit detailed description at this.
In the present embodiment, processor 10 can output to the channel selecting signal relevant with the mode of operation of RSU2 signal input selection module 40, thereby be set to master control RSU and still be set to non-master control RSU according to module 50 RSU2 are set, signal input selection module 40 selects to be imported into the Transistor-Transistor Logic level synchronizing signal of external interrupt module 12.Describe the process of using channel selecting signal to select in detail hereinafter with reference to Fig. 6 and Fig. 7.
When module 50 RSU2 being set being set to master mode, signal output modular converter 20 will be converted to outer synchronous signal from the TTL synchronizing signal of PWMO module 11 outputs, then outer synchronous signal be outputed to other non-master control RSU.Non-master control RSU carries out with the outer synchronous signal that receives synchronously.In addition, according to from processor 10 channel selecting signals relevant with master mode that receive, signal input selection module 40 selects the Transistor-Transistor Logic level synchronizing signal of PWMO module 11 outputs from the processor 10 of RSU2 as inner synchronousing signal, and the Transistor-Transistor Logic level synchronizing signal that receives is input to the external interrupt module 12 of processor 10, thereby realize the synchronous processing of master control RSU.
When module 50 RSU2 being set being set to non-master mode, PWMO module 11 does not produce the TTL synchronizing signal.According to from the relevant channel selecting signal of processor 10 master mode that receive and non-, signal input selection module 40 selects outside Transistor-Transistor Logic level synchronizing signal as synchronizing signal, and described outside Transistor-Transistor Logic level synchronizing signal is that outer synchronous signal that signal input modular converter 30 will receive from the master control RSU of outside is converted to the Transistor-Transistor Logic level synchronizing signal and the signal that obtains.Then, the outside Transistor-Transistor Logic level synchronizing signal that signal input selection module 40 will receive is input to the external interrupt module 12 of processor 10, thus the synchronizing process of finishing.
As shown in Figure 6, at present embodiment, when when module 50 RSU2 being set being set to master control RSU, PWMO module 11, external interrupt module 12, signal input selection module 40 and 20 work of signal output modular converter, and signal input modular converter 30 can not work (that is, not receiving outer synchronous signal).Under the control of processor 10, the PWMO module 11 in the processor 10 produces the Transistor-Transistor Logic level synchronizing signal with characteristic frequency and dutycycle, and the Transistor-Transistor Logic level synchronizing signal that produces is outputed to signal output modular converter 20.Signal output modular converter 20 is converted to the outer synchronous signal that is suitable for long Distance Transmission with the Transistor-Transistor Logic level synchronizing signal that receives, and via wired mode or wireless mode described outer synchronous signal is sent to non-master control RSU.Non-master control RSU carries out with the outer synchronous signal that receives synchronously.In addition, signal input selection module 40 is according to the channel signal relevant with master mode of processor 10 outputs, can receive the Transistor-Transistor Logic level synchronizing signal of PWMO module 11 generations as inner synchronousing signal, then the Transistor-Transistor Logic level synchronizing signal that receives is input to external interrupt module 12.External interrupt module 12 receives the Transistor-Transistor Logic level synchronizing signals, and use the Transistor-Transistor Logic level synchronizing signal that receives realize RSU2 synchronously.In other words owing to use same synchronizing signal that same PWMO module produces as with reference to carrying out synchronously, therefore can easily finish a plurality of RSU each other synchronously.
As shown in Figure 7, at present embodiment, when when module 50 RSU2 being set being set to non-master control RSU, external interrupt module 12, signal input modular converter 30 and 40 work of signal input selection module, and PWMO module 11 and signal output modular converter 20 can not worked.Via wired mode or wireless mode, signal input modular converter 30 receives the outer synchronous signal that sends from the master control RSU of outside, and the outer synchronous signal that receives is converted to outside Transistor-Transistor Logic level synchronizing signal.Then, should outside Transistor-Transistor Logic level synchronizing signal be input to signal input selection module 40.Signal input selection module 40 is according to the channel selecting signal relevant with non-master mode that processor 10 sends, and receives outside Transistor-Transistor Logic level synchronizing signal and sends it to external interrupt module 12 in the processor 10.By the Transistor-Transistor Logic level synchronizing signal that use receives, external interrupt module 12 realizes synchronous processing in the mode of external interrupt.Concrete synchronous applications and method are described in detail in conjunction with Fig. 1, therefore will be not described in detail at this.
In addition, because by selecting synchronizing signal with signal input module 40, so external interrupt module 12 can only receive synchronizing signal with an interface, and do not need the different interface of arranging of extra.
Should be appreciated that, the invention is not restricted to above-described embodiment, can also variety of way finish the configuration to RSU, so that can under master mode, produce synchronizing signal and receive synchronizing signal according to RSU of the present invention, and under non-master mode, only receive synchronizing signal, thereby realize between a plurality of RSU synchronously.
Show that such as Fig. 8 at step S801, determining to be set up module 50 by RSU, to be set to master mode also be non-master mode.
If determine that at step S801 RSU is in master mode, then the PWMO module 11 at the described RSU of step S803 produces and output Transistor-Transistor Logic level synchronizing signal.Then, at step S805, output signal modular converter 20 will be converted to the outer synchronous signal that is suitable for long Distance Transmission from the Transistor-Transistor Logic level signal that PWMO module 11 receives.At step S807, outer synchronous signal is outputed to non-master control RSU, from but not master control RSU carry out synchronously with described outer synchronous signal.In addition, at step S807, can realize by the Transistor-Transistor Logic level synchronizing signal that directly reads 11 generations of PWMO module in processor 10 inside the synchronous processing of described RSU, perhaps, can be according to the channel selecting signal relevant with master mode of processor 10 outputs, be received in the Transistor-Transistor Logic level synchronizing signal that step S803 produces by signal input selection module 40, and the Transistor-Transistor Logic level signal that receives is outputed to the synchronous processing that realizes described RSU in the external interrupt module 12 as inner synchronousing signal.
If determine that at step S801 RSU is in non-master mode, then at step S809, signal input modular converter 30 receives outer synchronous signal from the master control RSU of outside.Then at step S811, signal input modular converter 30 is converted to outside Transistor-Transistor Logic level synchronizing signal with the outer synchronous signal that receives.At step S813, the outside Transistor-Transistor Logic level synchronizing signal that step S811 is produced is input in the external interrupt module 12 of processor 10, to realize the synchronous processing of described RSU, perhaps, can be according to the channel selecting signal relevant with non-master mode of processor 10 outputs, the outside Transistor-Transistor Logic level synchronizing signal that is produced by signal input selection module 40 receiving step S811, and the Transistor-Transistor Logic level synchronizing signal that receives is input to the synchronous processing that external interrupt module 12 realizes described RSU.
Although specifically shown with reference to its exemplary embodiment and described the present invention, but it should be appreciated by those skilled in the art, in the situation that does not break away from the spirit and scope of the present invention that claim limits, can carry out various changes on form and the details to it.
Claims (10)
1. one kind is carried out synchronous roadside unit based on integrated pulse width modulation output, it is characterized in that described roadside unit comprises:
Module is set, is used for described roadside unit and is set to master control roadside unit or non-master control roadside unit;
The width modulation output module is arranged on the processor of described roadside unit;
Signal output modular converter,
Wherein, when the described roadside unit of module being set being set to the master control roadside unit,
The width modulation output module produces the first synchronizing signal, and first synchronizing signal that will produce outputs to signal output modular converter,
Signal output modular converter receives the first synchronizing signal, the first synchronizing signal that receives is converted to the second synchronizing signal, and the second synchronizing signal is outputed to non-master control roadside unit, from but not the master control roadside unit uses described the second synchronizing signal to carry out synchronously.
2. roadside unit as claimed in claim 1, it is characterized in that: when the described roadside unit of module being set being set to the master control roadside unit, described roadside unit directly reads the first synchronizing signal that the width modulation output module produces to carry out synchronously from processor inside.
3. roadside unit as claimed in claim 1 is characterized in that, described roadside unit also comprises:
The external interrupt module is arranged on the processor of described roadside unit;
Signal input modular converter,
Wherein, when the described roadside unit of module being set being set to non-master control roadside unit,
Signal input modular converter receives the second synchronizing signal from the master control roadside unit, and the second synchronizing signal is converted to the first synchronizing signal, and described the first synchronizing signal is input to the external interrupt module,
The external interrupt module receives from the first synchronizing signal of signal input modular converter output, and uses the first synchronizing signal to carry out synchronously.
4. roadside unit as claimed in claim 1 is characterized in that, described roadside unit also comprises:
Signal input selection module;
The external interrupt module is integrated on the processor that is integrated with the width modulation output module,
Wherein, when the described roadside unit of module being set being set to the master control roadside unit, signal input selection module is according to the channel selecting signal of processor output, reception from the first synchronizing signal of width modulation output module output as inner synchronousing signal, and first synchronizing signal that will receive is input to the external interrupt module
The external interrupt module receives from the first synchronizing signal of signal input selection module output, and uses the first synchronizing signal that receives to process synchronously.
5. roadside unit as claimed in claim 4 is characterized in that, described roadside unit also comprises:
Signal input modular converter,
Wherein, when the described roadside unit of module being set being set to non-master control roadside unit,
Signal input modular converter receives the second synchronizing signal from the master control roadside unit, and the second synchronizing signal that receives is converted to the first synchronizing signal, and the first synchronizing signal is input to signal input selection module,
Signal input selection module receives from the first synchronizing signal of signal input modular converter output according to the channel selecting signal from processor output, and first synchronizing signal that will receive is input to the external interrupt module,
The external interrupt module receives from the first synchronizing signal of signal input selection module output, and uses the first synchronizing signal that receives to carry out synchronously.
6. such as claim 4 or 5 described roadside units, it is characterized in that: to be set to the master control roadside unit also be that non-master control roadside unit is relevant to described channel selecting signal with the described roadside unit of module is set.
7. roadside unit method for synchronous based on integrated pulse width modulation output is characterized in that: described method comprises,
Determine that it also is non-master control roadside unit that roadside unit is set to the master control roadside unit;
If roadside unit is set to the master control roadside unit, then described roadside unit produces the first synchronizing signal, the first synchronizing signal that produces is converted to the second synchronizing signal, and the second synchronizing signal outputed to non-master control roadside unit, from but not the master control roadside unit uses described the second synchronizing signal to carry out synchronously;
If roadside unit is set to non-master control roadside unit, then described roadside unit receives the second synchronizing signal from the master control roadside unit, the second synchronizing signal that receives is converted to the first synchronizing signal, and uses the first synchronizing signal to carry out synchronously.
8. method as claimed in claim 7 is characterized in that: when described roadside unit is set to the master control roadside unit, by directly reading the first synchronizing signal of generation from the processor inside of described roadside unit, realize the synchronous of described roadside unit.
9. method as claimed in claim 7, it is characterized in that: when described roadside unit is set to the master control roadside unit, according to channel selecting signal, realize the synchronous of described roadside unit from the outside reception of processor and with the first synchronizing signal that described roadside unit produces.
10. method as claimed in claim 9, it is characterized in that: when described roadside unit is set to non-master control roadside unit, according to channel selecting signal, use the first synchronizing signal that obtains from the second synchronizing signal conversion of master control roadside unit reception to realize the synchronous of described roadside unit.
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| CN104574541A (en) * | 2014-12-26 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Method and system for synchronizing time sequence of RSUs and multiple antennae |
| CN113256828A (en) * | 2021-04-25 | 2021-08-13 | 北京万集科技股份有限公司 | Road side unit synchronization system and synchronization method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104574541A (en) * | 2014-12-26 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Method and system for synchronizing time sequence of RSUs and multiple antennae |
| CN113256828A (en) * | 2021-04-25 | 2021-08-13 | 北京万集科技股份有限公司 | Road side unit synchronization system and synchronization method |
| CN113256828B (en) * | 2021-04-25 | 2023-04-14 | 北京万集科技股份有限公司 | Road side unit synchronization system and synchronization method |
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