4. Over-the-horizon detection of low-altitude mobiles

4.1 General concept

The advantage of trans-horizon detection systems is that they enable low-altitude objects to be observed at very great distances. Conventional microwave radar solutions (microwaves radars) are unable to detect objects below the radar horizon, i.e. :

For a ground radar, whose antenna is located between 10 and 30 m above the terrain, a distant radar horizon is 13 to 23 km. This, combined with the aerial gain profile and ground effect, results in very...