CN202929854U - Stall state detection device based on wireless positioning - Google Patents

Abstract

The utility model relates to a stall state detection device based on wireless positioning. The stall state detection device based on the wireless positioning comprises a management terminal, three base station units and a vehicle-mounted unit. The management terminal, the base station units and the vehicle-mounted unit are respectively distributed with a unique identifier, and are connected in a wireless mode. The position coordinates of the three base station units are known, the position coordinate of the vehicle-mounted unit is obtained through respectively computing the distances between the three base station units and the vehicle-mounted units and using a positioning algorithm, and the occupied or free states of the stalls are judged through judging the inclusion relation of the position coordinate of each vehicle-mounted unit and the coordinate scope of each stall. The results can be used for parking lots of all sizes, and especially can be used in an large outdoor parking lot, the superiority of the stall state detection device based on the wireless positioning compared with the traditional stall detection system can be reflected, and the stall state detection device based on wireless positioning can be used as a vehicle positioning device in the parking lot.

Description

A kind of parking space state pick-up unit based on wireless location

Technical field

The utility model relates to a kind of parking space state detection field, is a kind of parking space state pick-up unit based on wireless location specifically.

Background technology

Along with motor vehicles increase, parking problem highlights day by day, and main cities more both domestic and external are being built or built all kinds of indoor and outdoors parking lot, particularly large parking lot.Realize the automatic management to the parking lot, parking space state is detected as and is matter of utmost importance.At present the detection overwhelming majority of parking space state disposed sensor in each parking stall, by sensor acquisition state information, and send data to control terminal by modes such as bus are interconnected or wireless and process and analyze.Application number is the giant magnetoresistance sensing parking space-detecting device based on wireless sense network of 201210186005,9 patented claim, needs RS-485 communication module, wireless Zigbee communication module, and the combination of the multiple modules such as giant magnetoresistance detection module realizes comparatively complicated; Application number be 201210040585.0 patented claim based on the method for detecting parking stalls of jpeg compressed image by CCD camera Real-time Collection parking stall image information, read in the parking stall view data that collects by computer system, these view data are carried out jpeg decompression successively be reduced to inverse quantization, the DC figure of extract light intensity level Y.Through the intercepting of tested parking stall, medium filtering, then utilize tested parking stall and background empty parking space view data to ask parking stall zone mean square deviation and the degree of correlation to differentiate the parking stall and take situation, have the accuracy of detection advantages of higher, but complex disposal process and cost are higher.In recent years, wireless sensor network with its lay flexibly, low-power consumption, the characteristics such as be quick on the draw, be used widely in the parking stall measure field in conjunction with various kinds of sensors such as eddy current sensor, sonac, infrared sensors.But distinct issues are: a sensor need to be disposed in a parking stall, realizes that parking stall measure need to drop into larger cost; In addition, the sensor of part type aspect installation to angle, highly, site condition etc. has strict requirement, this will limit accuracy of detection and the sensing range of stall testing apparatus.

The utility model content

The utility model provides a kind of parking space state pick-up unit based on wireless location, can overcome the problem that present parking position state-detection exists, and has the advantages such as cost is low, installation is simple, and extensibility is strong.

for realizing that the technical scheme that target of the present utility model adopts is: device is by the office terminal, three base station units and board units form, the office terminal, base station unit and board units all are assigned unique identifier, and interconnected by wireless mode, the position coordinates of three base station units is known, by calculating respectively the distance between three base station units and board units and adopting location algorithm to draw the position coordinates of board units, thereby the position coordinates by judging each board units and the relation of inclusion of each parking stall coordinate range are judged taking of parking stall or idle condition.

Describedly it is characterized in that the wireless interconnected mode between office terminal, three base station units and board units adopts standardized Dedicated Short Range Communications agreement DSRC.

Described office terminal can for computing machine or portable handheld device, manage parking space state.

The emissive power of described each base station unit is adjustable, and its covering radius is got this base station unit to the maximal value of parking lot frontier distance.

Between each base station unit of three base station units, the position is plane trigonometry type distributions, is beneficial to the location to board units.

The beneficial effects of the utility model are: need not wiring, with low cost, safeguard simply, can realize the accurate detection of parking space state.Achievement can be used for the parking lot of various scales, and especially the application in the outdoor large parking lot, more can embody the utility model than the superiority of traditional vehicle position detecting system, can be used as simultaneously vehicle locating device in the parking lot.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the deployment schematic diagram of base station unit of the present utility model.

Embodiment

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

In Fig. 1, A101 is the office terminal; B111, B112 and B113 are base station unit; C121 is board units.Undertaken interconnected by Dedicated Short Range Communications agreement DSRC between office terminal (A101), base station unit (B111), base station unit (B112), base station unit (B113) and board units (C121).

During use, for wireless data is identified, office terminal (A101), base station unit (B111), base station unit (B112), base station unit (B113) and board units (C121) respectively are assigned unique identifier.

Respectively at known position coordinates (x _a, y _a), (x _b, y _b), (x _c, y _c) 3 lay three base station units (B111), (B112) and (B113), and with the transmission power adjustment of three base station units (B111, B112 and B113) to covering the required big or small (see figure 2) of car park areas, if the current position coordinates of a certain board units (C121) is (x, y), distance three base station units (B111), (B112) and distance (B113) are respectively d _a, d _bAnd d _c, adopt the distance calculating method based on TOA time of arrival, calculate:

$d_a=\sqrt{{(x-x_a)}^2+{(y-y_a)}^2},$ $d_b=\sqrt{{(x-x_b)}^2+{(y-y_b)}^2},$ $d_c=\sqrt{{(x-x_c)}^2+{(y-y_c)}^2}$

Office terminal (A101) basis is from three base station units (B111), (B112) and d (B113) _a, d _bAnd d _c, adopt trilateration to calculate the position coordinates of board units (C121):

$\left(\begin{array}{c}x\\ y\end{array}\right)={\left(\begin{array}{cc}2(x_a-x_c)& 2(y_a-y_c)\\ 2(x_b-x_c)& 2(y_b-y_c)\end{array}\right)}^{-1}\left(\begin{array}{c}{x}_a^2-x_c^2+y_a^2-y_c^2+d_c^2-d_a^2\\ x_a^2-x_c^2+y_b^2-y_c^2+d_c^2-d_b^2\end{array}\right)$

If the coordinates regional of each parking stall is Q _n, n=1,2,3～..N, N are the parking stall sum in parking lot.If (x, y) ∈ is Q _n, Q _nCorresponding parking space state is occupied, otherwise idle.The operating position that managerial personnel can check current parking stall by office terminal (A101).

In Fig. 2,201～203 is base station unit, and the position is plane trigonometry type distributions, is beneficial to the location to board units; 204 is the overlapped coverage zone of base station unit (201), base station unit (202) and base station unit (203); 205 is car park areas.

Claims (5)

1. parking space state pick-up unit based on wireless location is characterized in that: device is comprised of office terminal, three base station units and board units, and interconnected by wireless mode.

2. a kind of parking space state pick-up unit based on wireless location according to claim 1 is characterized in that the wireless interconnected mode between office terminal, three base station units and board units adopts standardized Dedicated Short Range Communications agreement DSRC.

3. a kind of parking space state pick-up unit based on wireless location according to claim 1, is characterized in that the office terminal can for computing machine or portable handheld device, manage parking space state.

4. a kind of parking space state pick-up unit based on wireless location according to claim 1, the emissive power that it is characterized in that each base station unit is adjustable, its covering radius is got this base station unit to the maximal value of parking lot frontier distance.

5. a kind of parking space state pick-up unit based on wireless location according to claim 1 is characterized in that between each base station units of three base station units, the position is plane trigonometry type distributions.

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