How can the angular effect be better controlled when using a RADAR system?

The angular effect refers to the distortions and inaccuracies in speed measurement that can arise from the relative angle between the RADAR device and the target vehicle. To control this effect, positioning is key. When a RADAR system is set up as close to the road as possible, it minimizes the angle at which the RADAR signal intercepts the target vehicle. This is because a closer setup reduces the angular deviation from a direct line of sight to the target.

When the RADAR device is near the ground and the road, the likelihood of achieving a near-perpendicular angle to the target vehicle is enhanced. This configuration helps ensure that the measurements of speed and distance are as accurate as possible, significantly reducing the impact of the angular effect.

Other methods, such as modifying the RADAR signal's frequency or using a wider beam angle, do not directly address the angular relationship and can complicate measurements in different ways, while lowering the device to eye level may not be as effective as being positioned close to the road for minimizing angle-related issues. Thus, the positioning of the device is crucial for diminishing the angular effect.