Direction-of-Arrival Estimation of Electromagnetic Pulse Based on Energy Distribution

This paper investigates the direction-of-arrival (DOA) estimation of electromagnetic pulse (EMP) sources in modern radar system and proposes a novel EMP DOA estimation method. The method is based on energy distribution and improves the low accuracy and high computational complexity of the conventional estimation method. According to the characteristics of the EMP signal, the frequency point where 90% of the signal energy is concentrated is considered as the critical frequency point. Before this point, differently sized frequency sub-blocks are determined depending on the energy. After the critical frequency point, identically sized frequency sub-blocks are chosen at equal frequency intervals for processing. The proposed method is compared with the representative EMP DOA estimation methods. Simulation experiments are carried out to validate the effectiveness of the proposed method. The results illustrate that the computational complexity is significantly reduced while the accuracy is improved compared to the conventional method.