👉 Buhr, also known as a Buhr (or Buhr model), is a type of radar system used in aircraft navigation. It uses the principle of Doppler effect to determine the altitude and speed of an aircraft. The Buhr system has been widely used for ground-based aircraft navigation systems since its development by the German company R&D Bremen. Buhrs are characterized by their high accuracy, which allows them to provide a very precise indication of the aircraft's position in relation to the ground.