-17-
Figure 5.2 Install diagram of the radar for correcting the speed
Where
1
v
---the speed of the target(km/h)
v
---the speed output of the radar(km/h)
h
---the suspension height between the radar and the ground(m)
L
---the longitudinal distance between the center of the radiation and the
vertical pole.(m)
1
d
---the distance between the position of the radar and the vertical pole(m)
2
d
---the horizontal distance between the center of the radiation and the
vertical pole.(m)
Attention: The
1
d
in the equation 5.2 equal to 0 if the radar is installed on the
vertical pole aside the road, and the
2
d
－
1
d
equal to 0 if the radar is installed above and
faced the lane.
3. Some roads include two lanes with less traffic, so you can use the radar with direction
recognition to detect the two lanes at the same time. The installation method of the
radar is shown in figure 5.3
d
22
d
21
L2
L1
h
Figure 5.3 detect two lanes with one radar
In this situation, the equation (5.2) is still valid and just calculates the two lanes separately.
For the near lanes, the correction equation is as follow,
