Abstract:
Direction finding (DF) refers to determine the direction of unknown transmitter in space which received signal from it; there are several ways to achieve this.
The aim of this research is, how to detect the friendly and non-friendly frequencies and explain how to control antenna to find the target. In addition the purpose of this research is to study the direction finding technique and building a receiver with aboard that can be utilized with c ++ software to receive signals from an antenna.
The outcome of this research concentrates in how the countries protect themselves against enemy.