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Time Frequency Toolbox >> Time Frequency Toolbox > Choice of Particular Signals > dopnoise

dopnoise

Complex noisy doppler signal.

Calling Sequence

[Y,IFLAW]=dopnoise(N,FS,F0,D,V,T0,C)

Parameters

N :

number of points.

FS :

sampling frequency (in Hertz).

F0 :

target frequency (in Hertz).

D :

distance from the line to the observer (in meters).

V :

target velocity (in m/s).

T0 :

time center (default : N/2).

C :

wave velocity (in m/s) (default : 340).

Y :

Output signal.

IFLAW :

Model used as instantaneous frequency law.

Description

dopnoise generates a complex noisy doppler signal, normalized so as to be of unit energy.

Examples

[z,iflaw]=dopnoise(500,200,60,10,70,128);
subplot(211); plot(real(z));
subplot(212); plot(iflaw);
ifl=instfreq(z,11:478,10);
plot(ifl,'g');
sum(abs(z).^2)
a=gca(); a.axes_bounds([0 468 -0.01 0.51]);

Authors

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