1. The document proposes a system to link two vehicles using GPS to support group traveling without using communication tools like cell phones. 2. It would measure the distance between vehicles by calculating the total mileage for each and subtracting. Route is checked by calculating movement direction from last received coordinates. 3. The distance calculation converts coordinate information and angle to radius and calculates distance between two points based on differences in longitude and latitude.

1. Linking system between two vehicles using GPS s1140176 Tatsuya Hasegawa

2. Contents Background Purpose Problem Solution Model Problem How to measure distance Route check Future works

3. 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.

4. Purpose Develop the group traveling support system The driving support system matched to user's situation without using communication tool such as cell phone.

5. Problem How to measure distance between two vehicles. How to check route that the leading vehicle passed through.

6. 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.

7. Model -How to measure distance- Measuring the distance between two vehicle

8. Model –route check- Check whether the following vehicle runs the same route with the leading vehicle This is wrong route!

9. How to measure distance The coordinate information Angle ⇒ convert radiun A is radius of the earth. A = 6378137m ⊿ X is the displacement in longitude direction ⊿ Y is the displacement in latitude direction Measure the distance between two points

10. How to measure distance Calculate the run mileage The difference of each mileage is calculated.

11. Route check 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 First quadrant or third quadrant Second quadrant or fourth quadrant

12. Route check First quadrant Secondquadrant Third quadrant Fourth quadrant North East

13. Route check 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 The 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

14. Future works How communicate with two divices Improve the demonstration