Research on a Low Interception Directional Modulation Technology

In response to the launch satellite's low interception demand, the directional modulation technology based on the phased array is proposed, and the phase shift value of each antenna of each different symbol is obtained by integrating constellation points via the genetic algorithm. In various symbols, each antenna has a different phase shift angle, and it will not reach the amplitude value of the same direction superposition, resulting in a loss of amplitude gain. The loss brings some freedom. The final simulation results show that the directional modulation based on the phased array can enable the receiver to receive the traditional constellation map in the desired direction, and the constellation map is not distorted; in other directions, the receivers receive a distorted constellation map, and it is difficult for ordinary receivers to extract useful information from the distorted constellation map, so it can effectively and well achieve secure communication.