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fc = 5e9 # GHz
Wc = 200e3 # kHz
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vs_kmh = 1:100 # km/h
vs = vs_kmh*(1e3/3600) # m/s
c = 300e6 # m/s
λ = c/fc # m
fds = vs/(λ*Wc)
Ls = 1./(2*fds);
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for s in [5, 10, 15, 30, 50, 70, 90]
println("$s km/h: $(Ls[s]) symbols")
end
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using PyPlot
semilogy(vs_kmh, Ls)
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