Introduction of TACAN navigation system

Early air navigation used two or more ground navigation stations to determine the position of aircraft, and the positioning accuracy was very low. This positioning technology has no practical value. Therefore, in the mid-20th century, in order to achieve accurate aerial positioning and navigation, the Federal Telecommunication Laboratory of the United States developed the TACAN system according to the suggestions of the US Air Force and Navy. TACAN, formerly known as TACAN, is the abbreviation of tactical air navigation system-tactical air navigation system. It is a short-range polar coordinate radio navigation system. It consists of airborne transmitting and receiving equipment, display and ground station. The system was successfully developed in 1952. Its working distance is 400 ~ 500 kilometers, and it can simultaneously measure the orientation and distance of the ground platform relative to the aircraft. The principle of direction finding is similar to Vogel navigation system, and the principle of ranging is the same as that of rangefinder. The working frequency band is 962 ~ 12 13 MHz.