Linking system between two vehicles using GPS

s1140176 Tatsuya Hasegawa

Contents

• Background• Purpose• Problem• Solution• Model• Problem

• How to measure distance

• Route check• Future works

Background

• Communication is possible anytime in real time.

• The communication between drivers are necessary in the ITS in the future.

• The accident by operating the car navigation system and the cellular phone, happens frequently.

Purpose

• Develop the group traveling support system

• The driving support system matched to user's situation without using communication tool such as cell phone.

Problem

• How to measure distance between two vehicles.

• How to check route that the leading vehicle passed through.

5

Solution • Calculate total mileage of each vehicle.　　　　　↓　 　 Total mileage of the following subtract from

total mileage of the leading.

• Calculate direction to current coordinate from last received coordinates

　　　　　↓　 　 By calculating movement direction, the route is

checked.

6

Model -How to measure distance-

Measuring the distancebetween two vehicle

7

Model –route check-

Check whether the following vehicleruns the same route with the leading vehicle

This is wrong route!

8

How to measure distance

),( yxP ttt　

180

xX tt

180

yY tt

The coordinate information

Angle 　⇒　 convert radiun

9

)(1YYAY ttt

yXXAX tttt 11cos)(

A is radius of the earth. A = 6378137m

⊿ X is the displacement in longitude direction

⊿ Y is the displacement in latitude direction

YXD tti 22

Measure the distance between two points

How to measure distance

n

iin DD

0

Calculate the run mileage

DDD ncarfollowncarlead ,_,_

The difference of each mileage is calculated.

10

Route check

XXYY

tt

tttF1

1)(

XXYY

tt

tttF1''

1'')'('

A lean of the leading vehicle to time t from time t-1

A lean of the following vehicle to time t’ from time t’-1

11

0)( ＞tF First quadrant or third quadrant

0)( ＜tF Second quadrant or fourth quadrant

Route check

First quadrantSecondquadrant

Third quadrant Fourth quadrant

North

East

),( YX tt

),(11 YX tt

),( YX tt

Route check

13

)(tF

If the quadrant of F( t) equals the quadrant of F’(t’), the following vehicle run the same route with the leading vehicle.

第１象限と第３象限、　第２象限と第４象限の区別

)'(' tFThe quadrant of = the quadrant of

The difference of first quadrant and

third quadrant

First quadrant Third quadrant

The difference of second quadrant

and fourth quadrant

Fourth quadrant Second quadrant

01＞XX tt

01＜XX tt

Future works

• How communicate with two divices• Improve the demonstration