CN203118069U

CN203118069U - ETC (electronic toll collection) road side unit

Info

Publication number: CN203118069U
Application number: CN2013201425245U
Authority: CN
Inventors: 张姣姣; 杨胜姚; 田林岩; 武宏伟
Original assignee: Beijing Wanji Technology Co Ltd
Current assignee: Beijing Wanji Technology Co Ltd
Priority date: 2013-03-26
Filing date: 2013-03-26
Publication date: 2013-08-07
Anticipated expiration: 2023-03-26

Abstract

The utility model provides an ETC (electronic toll collection) road side unit which structurally comprises a phased array module, a DBF (digital beam forming) module and a control module. The ETC road side unit is characterized in that the phased array module is responsible for forming transmitted beams of microwave signals; the DBF module is responsible for positioning on-board units; and the control module is responsible for controlling the phased array module to form microwave beams directing to the on-board units according to positions of the on-board units acquired by the DBF module. The ETC road side unit can control the microwave beams to track the on-board units according to the positions of the on-board units acquired in real time, so that the problems of interference from adjacent lanes, interferences of car following and the like can be effectively solved, and ETC system transaction success rate is improved.

Description

A kind of ETC roadside unit

Technical field

The utility model is a kind of ETC roadside unit about the technical field of electronic equipment of E-payment system concretely.

Background technology

In the intelligent transportation system fast development, electric non-stop toll ETC(Electronic Toll Collection) system is widely used in charge gateways such as high speed, overpass, tunnel, parking lot, replace manual toll collection, improve charge efficient, effectively alleviated the charging aperture problem of blocking up.The topmost problem of ETC systems face is Transaction Success rate problem, and the stability of antenna area, adjacent lane disturb, all can influence with car interference, mutual time etc. the success ratio of transaction.Be illustrated in figure 1 as the monkey chatter of ETC systems face and the synoptic diagram that disturbs with car.

In Fig. 1, the desirable communication zone of two RSU is rectangle dash area (101a), communication zone can only track of all standing, and the communication zone scope satisfies the situation of bicycle transaction, often all is elliptic region among the figure (102a) but adopt the resulting communication zone of antenna technology in the reality.Sometimes because the antenna side lobe influence, communication zone is that other are irregularly shaped, even occur that two communication zones cover each other or the communication zone scope is excessive, be easy to produce monkey chatter and follow the car interference problem, antenna technologies such as main low secondary lobe by antenna, high sharpness are controlled the zone of emitting antenna at present, solve monkey chatter, but because influences such as device aging, environment changes, the situation that antenna area changes is of common occurrence, thereby leads to errors transaction.

The utility model content

The utility model proposes a kind of ETC roadside unit, its structure comprises phased array module (201), DBF module (202) and control module (203), it is characterized in that the responsible launching beam that forms microwave signal of described phased array module (201); Described DBF module (202) is responsible for receiving the microwave signal of vehicle electronics label emission, and calculates the position of vehicle electronics label; Described control module (203) links to each other with DBF module (202) with phased array module (201) by the exclusive data bus respectively, the microwave beam of the described vehicle electronics label of the described phased array module of position control (201) formation sensing of the vehicle electronics label that obtains according to described DBF module (202).

Described phased array module comprises array antenna (301), phase-shifting unit (302), phase shifting control unit (303), power splitter modules such as (304).Block diagram as shown in Figure 3.

Described DBF module comprises array antenna (401), down-converter unit (402), AD collecting unit (403), signal processing unit (404) etc., and block diagram as shown in Figure 4.

Described control module (500) comprises MCU module (501), RAM module (502), FLASH module (503), power module (504), communication interface (505) etc., and block diagram as shown in Figure 5.

This roadside unit can be formed electronic charging system without parking with RSU controller or computing machine, finishes the non-parking charge transaction flow.This roadside unit combines the advantage of phased-array technique and DBF technology effectively, improve the signal power strength on every side of real trade vehicle by phased-array technique, and the position according to the real trade vehicle, at any time change region shape and size, while is in conjunction with the precise locating function of DBF, can effectively solve problems such as antenna area instability and monkey chatter, improve RSU Transaction Success rate.

Description of drawings

The existing ETC track monkey chatter of Fig. 1 reaches with car disturbs synoptic diagram;

The ETC roadside unit structured flowchart that Fig. 2 the utility model provides;

Fig. 3 phased array module structured flowchart;

Fig. 4 DBF modular structure block diagram;

Fig. 5 control module structured flowchart;

Fig. 6 solves the monkey chatter synoptic diagram;

Fig. 7 solves with car and disturbs synoptic diagram;

Fig. 8 adapted at a high speed the car synoptic diagram;

Fig. 9 adapts to the bend scheme of installation;

Embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

Embodiment 1

Under the situation of only using phased array module, along with wearing out of equipment, changing may appear in scanning beam, makes and in this case monkey chatter will take place by OBU1 and the OBU2 that searches this track and adjacent lane simultaneously.The ETC roadside unit can accurately be located the OBU of target vehicle.By setting the transaction zone, the DBF module can be distinguished neighboring trace vehicle and this track vehicle OBU fast and accurately, and real target vehicle is concluded the business.As shown in Figure 6, after setting rectangular area (600) is the transaction communications zone, phased array module only sends wake-up signal in this transaction communications zone, and its wave beam is only in this zone interscan, have only when the OBU1 (601) of vehicle enters this zone and just can conclude the business with it, even RSU (603) receives the signal of neighboring trace OBU2 (602), owing to not in the rectangular area of regulation, also can not conclude the business with OBU2 (602).

Because the transaction zone boundary can accurately be set, and need not to limit the distance between this track and the neighboring trace, effectively reduces the isolated island width, same ETC toll zone width can increase a plurality of tracks, the utilization factor of room for promotion.This roadside unit can be applicable to the discrepancy charging aperture that the space is limited or vehicle is intensive, as parking lot, gateway, tunnel etc.

Embodiment 2

Described ETC roadside unit can gamut be located in the transaction zone, simultaneously a plurality of OBU are accurately located, distinguish the position of vehicle and make the power concentration zone accurately follow the tracks of correct vehicle, thereby the OBU to a plurality of vehicles of appearance in the zone of concluding the business, conclude the business in order or selectively, prevent because cause the situation of back car transaction earlier to take place with car.As shown in Figure 7, RSU receives two OBU information in the transaction zone, according to locating information, OBU1 (701) vehicle position is near RSU (700), then main beam real-time follow-up OBU1 (701) concludes the business earlier, after OBU2 (702) leans on, so finish Deng OBU1 (701) transaction, conclude the business with OBU2 (702) again.

Described ETC roadside unit can position the vehicle in the RSU range of receiving, inform track computing machine vehicle location, save the vehicle location checkout equipment in transaction zone, as ground induction coil, grating etc., level of integrated system height, installation difficulty are reduced, and can shorten construction period, reduction maintenance cost, the system's installation flexibility that increases.

Embodiment 3

Described ETC roadside unit can selectively concentrate on some little zones to signal in the delicate level time, keep the intensity that transmits and the sensitivity that receives signal in larger distance, makes that effectively the transaction zone becomes big, as shown in Figure 8.The DBF module can be passed to controller with the OBU locating information of catching the very first time simultaneously, allowing the phased array module signal follow vehicle all the time concludes the business, keep best communication efficiency, solve problems such as crossing traditional roadside unit transaction distance that car causes is too short, the reduction of communication success ratio at a high speed, improve ETC track traffic efficiency, be specially adapted to the gateway of highway, reduce the peak pressure that blocks up.

Embodiment 4

Described DBF module can position OBU accurately, so can selectively conclude the business to the OBU in some zones, phased array module can cooperate DBF module alignment target area to scan, and reaches in the specific region and concludes the business with OBU.This will no longer limit position and the shape at place, ETC track, the width in track also no longer is restricted, and according to concrete ETC track shape, sets the transaction zone, this zone can be rectangle, trapezoidal, parallelogram, arc, even special shape such as S type.This just can be placed on RSU at the turning, track, as shown in Figure 9, perhaps is applied in shape, limited application scenario, space as the parking lot, the application surface of expansion ETC.

Claims

1. ETC roadside unit, its structure comprises phased array module (201), DBF module (202) and control module (203), it is characterized in that described phased array module (201) is responsible for forming the launching beam of microwave signal; Described DBF module (202) is responsible for receiving the microwave signal of vehicle electronics label emission, and calculates the position of vehicle electronics label; The described phased array module of position control that described control module (203) is responsible for the vehicle electronics label that obtains according to described DBF module forms the microwave beam that points to described vehicle electronics label.

2. ETC roadside unit according to claim 1 is characterized in that described phased array module (201) comprises modules such as array antenna, phase-shifting unit, phase shifting control unit, power splitter.

3. ETC roadside unit according to claim 1 is characterized in that described DBF module (202) comprises modules such as array antenna, down-converter unit, AD collecting unit, signal processing unit.

4. ETC roadside unit according to claim 1 is characterized in that described control module (203) comprises modules such as MCU, RAM, FLASH, power supply, communication interface.