The influencing factors of Marine radar range

Marine radar is installed on a boat sailing for collision avoidance, ship positioning narrow waterway pilot radar, is a good assistant, sailors today let us know about the factors that affect Marine radar range.

1. Radar horizon distance: in normal weather, the influence of atmospheric refraction on the propagation of radar waves is slightly larger than that of light, so the radar limit range D (measured in nautical miles) is also slightly larger than the geographical visibility distance of the object.

2. Weather conditions: in rainy and foggy days, part of the energy of the radar wave is absorbed by water, and the object detection distance is shortened. When the warm air moves to the cold water, the radar wave propagation path bends towards the ground, which increases the radar operating distance; When forming atmospheric waveguide transmission, radar range increase greatly. When the cold air moves to the warm water surface and there is underrefraction, the propagation path of radar wave will tilt away from the ground, and the radar action distance can be shortened by 30% ~ 40%

3. The radar target limit for something with a distance equal to it's found that, in the screen just can detect the target from background noise echo in the distance.

Marine radar to small range is mainly related to the pulse width and vertical beam width. During the pulse transmission, the radar can not receive the echo; Under the beam along the outside of the target, radar wave can't shoot. Both in the scope of the head is to small range. A resolution in range and azimuth resolution. Radar range resolution is better than that of the azimuth resolution.