Fig. 5

Micro-Doppler frequency of single chaff dipoles with different elevation angles (in the reference coordinates): a θ = 15^∘, φ = 30^∘, d_r = 722 m, b θ = 45^∘, φ = 30^∘, d_r = 722 m, and c θ = 75^∘, φ = 30^∘, d_r = 722 m