What is radio direction finding?

Radio direction finding is based on the propagation characteristics of electromagnetic waves, the use of equipment to determine the direction of radio waves to the process. The determination of "direction of incoming wave" refers to the direction of radio wave in the real electromagnetic environment where the direction finder is located. The general ultimate purpose of radio direction finding is to determine the direction of radiation source and the specific position of radiation source.
In the early radio communication, in order to receive the power of the radio station and ensure the quality of communication, people are committed to the study of directional transmission and reception of electromagnetic wave, the key part of which is the research of directional antenna. The research and application of directional antenna lay a foundation for radio direction finding.

Radio waves have the characteristics of straight line propagation in the air. If the direction of radio wave propagation can be determined, the direction of the launching station can be determined.
Radio direction finding is one of the competitive sports and the main content of radio activities. It is similar to the well-known game of hide and seek, but it is to find a small signal source (transmitter) that can transmit radio waves, which is radio hide and seek. It is the combination of modern radio communication technology and traditional hide and seek game.