CN101965590B - Communication domain restricting device for ETCS terminal - Google Patents
Communication domain restricting device for ETCS terminal Download PDFInfo
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- CN101965590B CN101965590B CN200980107658XA CN200980107658A CN101965590B CN 101965590 B CN101965590 B CN 101965590B CN 200980107658X A CN200980107658X A CN 200980107658XA CN 200980107658 A CN200980107658 A CN 200980107658A CN 101965590 B CN101965590 B CN 101965590B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
- G07B15/063—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
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- Quality & Reliability (AREA)
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- Devices For Checking Fares Or Tickets At Control Points (AREA)
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Abstract
A communication domain restricting device for an ETCS (Electric Toll Collection System) terminal of an OBU (On Board Unit) having an antenna, an RF receiving unit, an RF transmitting unit, and a baseband transmitting/receiving unit, includes an OBU receiving performance restricting unit arranged at a receiving end of an ASK (Amplitude Shift Keying) demodulator of the RF receiving unit. The OBU receiving performance restricting unit includes a digital control block and an RSSI control block which operate to restrict the receiving performance of the OBU such that transmission or reception can be performed only in a communication domain of a predetermined range. The communication domain restricting device of the present invention overcomes the drawbacks of noises which degrade performance of ETCS in a region other than the communication domain and the deterioration of the efficiency of switching between reception and transmission when the OBU enters the communication domain.
Description
Technical field
The present invention relates to the communication range restraint device at E-payment system (ETCS) terminal; Relate in particular to the receptivity at accurate calibrated electronic Fare Collection System (ETCS) terminal, to improve E-payment system (ETCS) terminal of the communication success ratio of E-payment system (ETCS) terminal in communication range.
Background technology
E-payment system (Electric Toll Collection System; Call " ETCS " in the following text) speed of expressing one's gratification again passes through system; Being the no stopping charging system that utilizes the wireless communication system of 5.8GHZ, also is to realize obtaining to reduce traffic congestion, improves environment; Intelligent railway and highway system (Intelligent Transport System calls " ITS " in the following text) ultimate system of effects such as traffic system Electronic Data Processing.
Above-mentioned E-payment system (ETCS) communication system is utilized amplitude-shift keying (the Amplitude Shift Keying of 5.8GHZ frequency band; Call " ASK " in the following text) mode; Be divided into manual and the active dual mode; Wherein, active mode has not only at E-payment system (ETCS), also in the easy advantage that realizes of ITS.
Fig. 1 is the general structural representation of E-payment system (ETCS).
As shown in Figure 1; E-payment system (Electric Toll Collection System; ETCS) comprise vehicle boarded device (On Board Unit; Call " OBU " in the following text) 110, first wagon detector 120, second wagon detector 125, the first roadside device (Road Side Equipment calls " RSU1 " in the following text), the 130 and second roadside device (Road Side Equipment calls " RSU2 " in the following text) 135.
Above-mentioned vehicle boarded device (OBU) 110 is for being equipped on the terminal of vehicle, with above-mentioned roadside device (RSU) 130,135 mutual the transmissions or reception RF (Radio Frequency) as the terminal that is arranged at the roadside.120,125 of above-mentioned wagon detectors are used to discern vehicle, and are irrelevant with transmission or the reception of RF (Radio Frequency).Above-mentioned vehicle boarded device (OBU) 110 through successively through first wagon detector 120, second wagon detector 125, the first roadside device (RSU1) 130, the second roadside device (RSU2) 135 is accomplished tollbooths needs programs.
Above-mentioned communication range 150 is represented in the interval of representing with arrow among Fig. 1; This representes above-mentioned vehicle boarded device (OBU) 110 and above-mentioned roadside device (RSU) 130, between 135 the interval of transmitt or receive signal; And be to optimize according to condition of road surface, from but the project that can not change after the E-payment system (ETCS) is set in the roadside.
In order to reduce the failure of E-payment system (ETCS) to greatest extent; Above-mentioned communication range 150 strictnesses are limited within the certain distance scope, but can form required communication range 150 through the transmitted power and the boresight antenna biasing of calibrating above-mentioned roadside device (RSU) 130,135 according to user's needs.Above-mentioned communication range 150 must not exceed the position of first wagon detector 120; And if the zone outside above-mentioned communication range 150; For example before above-mentioned first wagon detector 120, carry out above-mentioned vehicle boarded device (OBU) 110 and above-mentioned roadside device (RSU) 130, the transmitt or receive signal between 135, then will be judged to be failure.That is, have only above-mentioned vehicle boarded device (OBU) 110 and above-mentioned roadside device (RSU) 130, the signal between 135 to send or be received within the above-mentioned communication range 150 and accomplish, just be regarded as normal running.Therefore; In order to observe the above-mentioned communication range 150 of E-payment system (ETCS); The performance of above-mentioned vehicle boarded device (OBU) 110 is essential outstanding; And for the communication range 150 of afore mentioned rules, the failure possibility of the transmission of vehicle boarded device (OBU) 110, the poor more E-payment system of receptivity (ETCS) is high more.
Fig. 2 is for having E-payment system (ETCS) now with sending part or sending part embodiment synoptic diagram.
As shown in Figure 2, existing E-payment system (ETCS) comprises antenna 100, RF transmission/acceptance division 200, Base Band (Baseband) transmission/acceptance division 300.
Above-mentioned RF transmission/acceptance division 200 comprises RF acceptance division 210, RF sending part 220 and RF switch 230.Above-mentioned RF acceptance division 210 comprises low noise amplifier 212, down-conversion mixer, wave filter 216, ASK detuner 218.
Above-mentioned low noise amplifier 212 amplification RF signals.Above-mentioned down-conversion mixer 214 down-converts to IF (Intermediate Frequency) signal with the RF signal that amplifies.The noise (noise) that above-mentioned wave filter 216 filters through the signal of frequency downconversion.Above-mentioned ASK detuner 218 is exported numeral (Digital) signals with the signal that receives with ASK (Amplitude Shift Keying) mode demodulation (Demodulation) and to above-mentioned Base Band (Baseband) transmission/acceptance division 300.
Above-mentioned RF sending part 220 comprises up-conversion mixer 222 and power amplifier 224.Above-mentioned up-conversion mixer 222 will up-convert to the RF signal from the signal of above-mentioned Base Band (Baseband) transmission/acceptance division 300 inputs, and above-mentioned power amplifier 224 is enlarged into the RF signal signal of required output level (Level).
In above-mentioned Fig. 2, omitted the diagram of VCO (Voltage Controlled Oscillator) and PLL (Phase Locked Loop).
Fig. 3 is the synoptic diagram of explanation according to E-payment system (ETCS) the communication success ratio of the performance of vehicle boarded system (OBU).
Like Fig. 3 and shown in Figure 1, the minimal communications success ratio in the 350 expression communication ranges 150; The transmission of the 310 vehicle boarded devices of expression (OBU) 110, the communication success ratio when receptivity is higher than standard; The transmission of the 330 vehicle boarded devices of expression (OBU) 110, the communication success ratio when receptivity is lower than standard; 110 the transmission of the 320 vehicle boarded devices of expression (OBU), receptivity conformance with standard and communication success ratio when optimised.
Above-mentioned 350 for the communication success ratios at E-payment system (ETCS) terminal are the situation of minimal communications success ratio, E-payment system (ETCS) terminal will fail (Fail) handle.Above-mentioned 310 is the outstanding so that overproof situation of transmission, the receptivity of vehicle boarded device (OBU) 110, and at this moment, signal was promptly sent, receives in interval that will be outside communication range before the position of first wagon detector 120.
Above-mentioned 330 is the substandard situation of transmission, receptivity of vehicle boarded device (OBU) 110, at this moment, though do not exceed communication range, the interval 340 that the communication success ratio in the communication range sharply descends can occur.At this moment, if the possibility height that vehicle boarded device (OBU) 110 at a high speed through E-payment system (ETCS) interval, is then failed.
Above-mentioned 320 do not exceed communication range 150 for transmission, the receptivity of vehicle boarded device (OBU) 110; And it is different with above-mentioned 310 situation; The situation that does not have the interval of the success ratio minimizing of not communicating by letter in the communication range 150; Therefore, even vehicle boarded device (OBU) 110 passes through at a high speed, also can keep stable performance.
Vehicle boarded device (OBU) the sending part output signal schematic representation of Fig. 4 for obtaining through the sending part performance that reduces existing vehicle boarded device (OBU).
Fig. 4 and shown in Figure 1; The left side figure of Fig. 4 is general vehicle loading device (OBU) sending part output signal schematic representation; Wherein vehicle boarded device (OBU) 110 output signals need to export with the size more than the certain level for modulate the signal of (Modulation) with the ASK mode.
Above-mentioned output quality of signals is represented with modulation index 412, and this will be defined as the poor of carrier wave composition 410 and amplitude excursion 414.The difference of above-mentioned carrier wave composition 410 and above-mentioned amplitude excursion composition 414 is more little, just representes that modulation index 412 is outstanding more, and this transmission, receptivity of also representing vehicle boarded device (OBU) 110 output quality of signals and vehicle boarded device (OBU) 110 are good.
The right side figure of Fig. 4 is vehicle boarded device (OBU) the 110 sending parts output signal schematic representation that obtains through the sending part performance that reduces vehicle boarded device (OBU) 110; When keeping carrier wave composition 420, reduce amplitude excursion composition 424, to reduce modulation index 422.If the method for sending the above-mentioned modulation index 422 of signals through the vehicle boarded device of reduction (OBU) 110 reduces vehicle boarded device (OBU) 110 transmission performances; Then can reduce the acceptance division receptivity of roadside device (RSU) 130,135, thus but limiting vehicle loading device (OBU) 110 and roadside device (RSU) 130, the communication range between 135 150.
Though above-mentioned prior art can satisfy required communication range, there is following problem:
That is, E-payment system (ETCS) is when receiving signal, must send signal with the working method of vehicle boarded device (OBU) 110.Therefore, can not limiting vehicle loading device (OBU) 110 acceptance division performances, thus before getting into communication range 150, normally receive signal by the acceptance division of vehicle boarded device (OBU) 110, and the sending part of vehicle boarded device (OBU) 110 is also exported signal.Promptly; Before communication range, be not success of vehicle boarded device (OBU) 110 and roadside device (RSU) 130, the communication between 135, but unnecessary duty has taken place; Therefore; The zone of vehicle boarded device (OBU) 110 outside communication range 150 produces the noise (Noise) that disturbs E-payment system (ETCS) performance, and after the communication range 50 that gets into vehicle boarded device (OBU) 110, reduces the efficiency that receives, sends conversion.
Summary of the invention
[problem to be solved]
The communication range restraint device that the objective of the invention is to overcome the deficiency of prior art and a kind of E-payment system (ETCS) terminal is provided, it can be in limited communication range, the receiving sensitivity at accurate automatically controlled terminal.
[problem solution]
For achieving the above object; The present invention provides the communication range restraint device at E-payment system (ETCS) terminal; It is characterized in that: in the E-payment system (ETCS) of the vehicle boarded device (OBU) that comprises antenna, RF acceptance division, RF sending part and Base Band (Baseband) transmission/acceptance division; At ASK detuner receiving end as an above-mentioned RF acceptance division part; The receptivity restraint device that also comprises the vehicle boarded device (OBU) that constitutes by digital control and RSSI control part, controlling the receptivity of above-mentioned vehicle boarded device (OBU), thereby only at certain communication range transmitt or receive signal.
[effect]
The present invention observes the communication range of E-payment system (ETCS); And only more than acceptance criteria sensitivity, start the sending part at terminal; Thereby the zone that solves outside communication range produces the noise that disturbs E-payment system (ETCS) performance; And after the communication range that gets into vehicle boarded device (OBU), reduce the problem of sending, receiving conversion efficiency.
Description of drawings
Fig. 1 is the general structural representation of E-payment system (ETCS);
Fig. 2 is for having E-payment system (ETCS) now with sending part or sending part embodiment synoptic diagram;
Fig. 3 is the synoptic diagram of explanation according to E-payment system (ETCS) the communication success ratio of the performance of vehicle boarded system (OBU);
Vehicle boarded device (OBU) the sending part output signal schematic representation of Fig. 4 for obtaining through the sending part performance that reduces existing vehicle boarded device (OBU);
Fig. 5 is the communication range restraint device structural drawing at E-payment system of the present invention (ETCS) terminal;
Fig. 6 is the RSSI curve map of the explanation vehicle boarded device of the present invention (OBU) receptivity method of operating;
Fig. 7 is the ASK output signal curve figure of controllable RSSI of vehicle according to the invention loading device (OBU) acceptance and Demodulation.
Embodiment
Below, in conjunction with accompanying drawing the specific embodiment of the invention is elaborated.
Fig. 5 is the communication range restraint device structural drawing at E-payment system of the present invention (ETCS) terminal.
Like Fig. 5 and shown in Figure 2; Communication range restraint device of the present invention, formation comprises the E-payment system (ETCS) of the vehicle boarded device (OBU) of antenna 100, RF transmission/acceptance division 200, Base Band (Baseband) transmission/acceptance division 300 and vehicle boarded device (OBU) terminal internal memory 400.Above-mentioned RF transmission/acceptance division 200 except that original RF acceptance division 210, RF sending part 220 and RF switch 230, also comprises the receptivity restraint device 240 of vehicle boarded device (OBU).
Above-mentioned receptivity restraint device 240 plays the effect of limiting vehicle loading device (OBU) receptivity for constituting the circuit of characteristic of the present invention, comprises digital control 242 and RSSI control part 244.Above-mentioned RSSI control part 244 is the circuit of generation with the RSSI that is in proportion (Received Signal Strength Indicator) the output signal that receives signal, and calibrates through digital control 242.
Above-mentioned RSSI control part 244 is calibrated through above-mentioned digital control 242, and can be according to above-mentioned through the RSSI threshold value of calibration or the optimization signal value of standard receiving sensitivity, the output signal of calibration ASK detuner 218.Above-mentioned output signal is passed to Base Band (Baseband) transmission/acceptance division 300, and this moment, the optimization digital control value of RSSI threshold value or standard receiving sensitivity will be stored in vehicle boarded device (OBU) terminal internal memory 400.
Above-mentioned antenna 100, RF transmission/acceptance division 200, Base Band (Baseband) transmission/acceptance division 300 had been explained in Fig. 2, therefore, repeated no more at this.
Fig. 6 is the RSSI curve map of the explanation vehicle boarded device of the present invention (OBU) receptivity method of operating.
Like Fig. 6 and shown in Figure 5, the standard receiving sensitivity of the 610 vehicle boarded devices of expression (OBU); 611 expression RSSI; 620 expression RSSI threshold values (Threshold Value, RSSIth); 613 expression RSSI slopes (Slope).Above-mentioned standard receiving sensitivity 610 is when being used between the different vehicle loading device (OBU), and the receiving sensitivity deviation needs very little.The reception signal magnitude that above-mentioned RSSI threshold value 620 plays the vehicle boarded device of decision (OBU) greater than still less than the effect of the standard value of RSSI threshold value 620, and through above-mentioned RSSI control part 244 calibrations.
Fig. 7 is the ASK output signal curve figure of controllable RSSI of vehicle according to the invention loading device (OBU) acceptance and Demodulation.
Like Fig. 7 and shown in Figure 5, the standard receiving sensitivity (Pref) of the 610 vehicle boarded devices of expression (OBU); 730 expression RSSI; 740 expressions are through the ASK of demodulation output signal.
Above-mentioned RSSI730 produces at above-mentioned RSSI control part 244, and when receiving signal greater than the RSSI threshold value (RSSIth) corresponding with above-mentioned standard receiving sensitivity 610, the logic level height; And when receiving signal magnitude less than above-mentioned RSSI threshold value (RSSIth), logic level is low.
740 of above-mentioned output signals are just exported during greater than the RSSI threshold value (RSSIth) corresponding with above-mentioned standard receiving sensitivity 610 in the reception signal magnitude of vehicle boarded device (OBU); And when receiving signal magnitude, do not produce the output signal less than above-mentioned RSSI threshold value (RSSIth).
The invention described above communication range restraint device is applied to vehicle boarded device (OBU), but also can be applied to roadside device (RSU) as required.If above-mentioned communication range restraint device is applied to roadside device (RSU); Then can be through in the application mode of above-mentioned Fig. 5 to the vehicle boarded device illustrated in fig. 7 (OBU); Promptly limit the communication range of roadside device (RSU) through calibration RSSI slope 611 or RSSI threshold value (RSSIth); Therefore, repeat no more at this.
Through the content of above-mentioned explanation, can draw as drawing a conclusion:
The first, RSSI control part 244 calibration RSSI slope 611 and the RSSI threshold values (RSSIth) of user through utilizing digital control 242 calibration; Accurately calibrate to the level (Level) of desired level with receiving sensitivity, thereby the signal transmission/reception between vehicle boarded device (OBU) and the roadside device (RSU) is only carried out within communication range 150 vehicle boarded device (OBU).
The second, RSSI control part 244 is through the RSSI630 function; The input signal of standard receiving sensitivity below 610 is not created in the output signal of the acceptance division demodulation (Demodulation) of vehicle boarded device (OBU); And when standard receiving sensitivity 610 is above, produce the transmission output signal of vehicle boarded device (OBU).
Three, calibrate through digital control (Digital Control) mode because of communication range restraint device of the present invention; Therefore; When making vehicle boarded device (OBU), realize calibration (Auto-Calibration) function automatically; And when making vehicle boarded device (OBU), RSSI threshold value that experiment is obtained or the digital control value (Digital Control Value) that the standard receiving sensitivity has been optimized is stored in vehicle boarded device (OBU) terminal internal memory 400, thus realize easily.
Four, above-mentioned communication range restraint device is not only applicable to vehicle boarded device (OBU), but also is applicable to roadside device (RSU), and this moment, can with the vehicle boarded device (OBU) of above-mentioned explanation in should implement in a like fashion.
The foregoing description is only unrestricted in order to explanation the present invention; Those of ordinary skill in the art is to be understood that; Can make amendment, be out of shape the present invention or be equal to replacement, and not break away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. the communication range restraint device at an E-payment system (ETCS) terminal; It is characterized in that: in the E-payment system (ETCS) of the vehicle boarded device (OBU) that comprises antenna, RF acceptance division, RF sending part and Base Band (Baseband) transmission/acceptance division; At ASK detuner receiving end as an above-mentioned RF acceptance division part; The receptivity restraint device that also comprises the vehicle boarded device (OBU) that constitutes by digital control and RSSI control part; To control the receptivity of above-mentioned vehicle boarded device (OBU); Thereby only at certain communication range transmitt or receive signal, and above-mentioned RSSI control part is controlled amplitude-shift keying (ASK) the output signal that produces in the above-mentioned ASK detuner through calibration RSSI threshold value or RSSI slope.
2. the communication range restraint device at E-payment system according to claim 1 (ETCS) terminal is characterized in that: above-mentioned amplitude-shift keying (ASK) output signal is only just exported during greater than the RSSI threshold value corresponding with above-mentioned standard receiving sensitivity (Pref) in the reception signal power input (Input power) of vehicle boarded device (OBU).
3. the communication range restraint device at E-payment system according to claim 1 (ETCS) terminal is characterized in that: above-mentioned RF sending part is only at transmission signal when above greater than the standard receiving sensitivity (Pref) corresponding with the RSSI threshold value.
4. the communication range restraint device at E-payment system according to claim 1 (ETCS) terminal is characterized in that: vehicle boarded device (OBU) the terminal internal memory that also comprises the digital control value (Digital Control Value) that is used to preserve RSSI threshold value or standard receiving sensitivity (Pref) at above-mentioned Base Band (Baseband) transmission/acceptance division one side.
5. the communication range restraint device at an E-payment system (ETCS) terminal; It is characterized in that: in the communication range restraint device at E-payment system (ETCS) terminal that possesses the antenna, RF acceptance division, RF sending part and Base Band (Baseband) transmission/acceptance division that respectively are attached to a plurality of roadsides devices (RSU); At ASK detuner receiving end as an above-mentioned RF acceptance division part; The receptivity restraint device that also comprises the roadside device (RSU) that constitutes by digital control and RSSI control part; To control the receptivity of above-mentioned roadside device (RSU); Thereby only at certain communication range transmitt or receive signal, and above-mentioned RSSI control part is controlled amplitude-shift keying (ASK) the output signal that produces in the above-mentioned ASK detuner through calibration RSSI threshold value or RSSI slope.
6. the communication range restraint device at E-payment system according to claim 5 (ETCS) terminal is characterized in that: above-mentioned amplitude-shift keying (ASK) output signal is only just exported during greater than the RSSI threshold value corresponding with above-mentioned standard receiving sensitivity (Pref) in the reception signal power input (Input power) of vehicle boarded device (OBU).
7. the communication range restraint device at E-payment system according to claim 5 (ETCS) terminal is characterized in that: above-mentioned RF sending part is only at transmission signal when above greater than the standard receiving sensitivity (Pref) corresponding with the RSSI threshold value.
8. the communication range restraint device at E-payment system according to claim 5 (ETCS) terminal is characterized in that: roadside device (RSU) the terminal internal memory that also comprises the digital control value (Digital Control Value) that is used to preserve RSSI threshold value or standard receiving sensitivity (Pref) at above-mentioned Base Band (Baseband) transmission/acceptance division one side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080020597A KR101016938B1 (en) | 2008-03-05 | 2008-03-05 | Electrical toll collection system with terminal limiting communication zone |
| KR10-2008-0020597 | 2008-03-05 | ||
| PCT/KR2009/001102 WO2009110758A2 (en) | 2008-03-05 | 2009-03-05 | Communication domain restricting device for etcs terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101965590A CN101965590A (en) | 2011-02-02 |
| CN101965590B true CN101965590B (en) | 2012-12-26 |
Family
ID=41056480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980107658XA Expired - Fee Related CN101965590B (en) | 2008-03-05 | 2009-03-05 | Communication domain restricting device for ETCS terminal |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5279849B2 (en) |
| KR (1) | KR101016938B1 (en) |
| CN (1) | CN101965590B (en) |
| WO (1) | WO2009110758A2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568043B (en) * | 2010-12-23 | 2014-01-08 | 博通集成电路（上海）有限公司 | Method and vehicle-mounted unit for electronic tolling system |
| CN102693585B (en) * | 2011-03-25 | 2016-04-13 | 深圳市金溢科技股份有限公司 | Board units |
| CN102810146B (en) * | 2011-05-31 | 2016-06-15 | 中兴通讯股份有限公司 | A kind of electronic tag and power calibrating method, calibrator (-ter) unit and calibration system |
| CN102915571B (en) * | 2011-08-05 | 2015-09-16 | 深圳市金溢科技股份有限公司 | Roadside unit, board units signal screening system and signal screening method |
| CN103310492B (en) * | 2012-03-06 | 2018-01-26 | 深圳市金溢科技股份有限公司 | A kind of sensitivity calibration system and its calibration method |
| CN102819872B (en) * | 2012-07-31 | 2014-09-10 | 北京万集科技股份有限公司 | Curved road side method and device for road collection |
| CN103914883B (en) * | 2012-12-28 | 2016-06-08 | 北京北大千方科技有限公司 | Method and system for controlling sensitivity of road side equipment |
| CN105791042B (en) * | 2014-12-24 | 2020-11-17 | 航天信息股份有限公司 | Communication quality testing method in ETC system |
| CN108235226B (en) * | 2016-12-09 | 2020-07-24 | 北京万集科技股份有限公司 | DSRC vehicle-mounted equipment working method and device |
| CN108257238B (en) * | 2018-02-13 | 2020-07-10 | 深圳市金溢科技股份有限公司 | Electronic toll collection equipment and radio frequency front end and radio frequency receiving method thereof |
| CN108932781B (en) * | 2018-07-26 | 2021-06-11 | 天津中兴智联科技有限公司 | RSSI threshold value self-learning method in access control management scene |
| CN114257740A (en) * | 2021-12-14 | 2022-03-29 | 上海应用技术大学 | Monitoring device |
| CN115512451B (en) * | 2022-09-16 | 2023-06-09 | 广州隧华智慧交通科技有限公司 | Switchable highway toll ETC lane system |
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- 2009-03-05 WO PCT/KR2009/001102 patent/WO2009110758A2/en active Application Filing
- 2009-03-05 JP JP2010549576A patent/JP5279849B2/en not_active Expired - Fee Related
- 2009-03-05 CN CN200980107658XA patent/CN101965590B/en not_active Expired - Fee Related
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| KR20030030187A (en) * | 2001-10-09 | 2003-04-18 | 삼성전기주식회사 | Rf device of etcs |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101016938B1 (en) | 2011-02-25 |
| WO2009110758A2 (en) | 2009-09-11 |
| WO2009110758A3 (en) | 2009-12-30 |
| JP5279849B2 (en) | 2013-09-04 |
| KR20090095323A (en) | 2009-09-09 |
| CN101965590A (en) | 2011-02-02 |
| JP2011517875A (en) | 2011-06-16 |
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