Simulation of electromagnetic field of a fast moving target close to antennas

Experiments have shown that Doppler signatures of a missile moving in a close vicinity of the antenna is quite complex. Experimentally obtained spectrograms exhibit clusters of Doppler frequencies instead of a single one. This is due to the fact that radial velocities differ significantly for different parts of the missile. Partial numerical simulations of this complex problem have been carried out for thin long fast-moving targets (wires). Simulation results compare well with measured Doppler signatures and enable better understanding of the problem and therefore improve the ability to distinguish dangerous targets from ordinary ones.