Fig. 6

Micro-Doppler frequency of single chaff dipoles with different azimuths (in the reference coordinates): a θ = 30^∘, φ = 60^∘, d_r = 722 m, b θ = 30^∘, φ = 120^∘, d_r = 722 m, and c θ = 30^∘, φ = 180^∘, d_r = 722 m