Documentation

gmonopuls

Gaussian monopulse

Syntax

y = gmonopuls(t,fc)
tc = gmonopuls('cutoff',fc)

Description

y = gmonopuls(t,fc) returns samples of the unit-amplitude Gaussian monopulse with center frequency fc (in hertz) at the times indicated in array t. By default, fc = 1000 Hz.

tc = gmonopuls('cutoff',fc) returns the time duration between the maximum and minimum amplitudes of the pulse.

Examples

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Gaussian Monopulse

Consider a Gaussian monopulse with center frequency $f_c=2$ GHz and sampled at a rate of 100 GHz. Determine the cutoff time $t_c$ using the 'cutoff' option and compute the monopulse between $-2t_c$ and $2t_c$.

fc = 2e9;
fs = 100e9;

tc = gmonopuls('cutoff',fc);
t  = -2*tc:1/fs:2*tc;

y = gmonopuls(t,fc);

The monopulse is defined by the equation

$$y(t)=e^{1/2}(t/\sigma)\exp(-(t/\sigma)^2/2),$$

where $\sigma=t_c/2=1/(2\pi f_c)$ and the exponential factor is such that $y(\sigma)=1$. Plot the two curves and verify that they match.

sg = 1/(2*pi*fc);

ys = exp(1/2)*t/sg.*exp(-(t/sg).^2/2);

plot(t,y,t,ys,'.')
legend('gmonopuls','Definition')

Gaussian Monopulse Pulse Train

Consider a Gaussian monopulse with center frequency $f_c=2$ GHz and sampled at a rate of 100 GHz. Use the monopulse to construct a pulse train with a spacing of 7.5 ns.

Determine the width $t_c$ of each pulse using the 'cutoff' option. Set the delay times to be integer multiples of the spacing.

fc = 2e9;
fs = 100e9;

tc = gmonopuls('cutoff',fc);
D = ((0:2)*7.5+2.5)*1e-9;

Generate the pulse train such that the total duration is $150t_c$. Plot the result.

t  = 0:1/fs:150*tc;
yp = pulstran(t,D,'gmonopuls',fc);

plot(t,yp)

More About

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Tips

Default values are substituted for empty or omitted trailing input arguments.

Introduced before R2006a

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