Linear Frequency Modulated Waveform

2013 7 20
1 个回答
120 次查看（30 天）

0 个投票

why LFM waveform has varying amplitude when i take step of phased.LinearFMWaveform

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Wayne King
Wayne King 2013-7-20
Can you please show how you set the properties for your System object.
Jagadeeshvelan kumar
编辑：Honglei Chen 2013-7-22
clc;
clear all;
pd=0.9;
pfa=1e-6;
max_range=1000;
range_res=0.5 ;
fc=35e9;
prop_speed = physconst('LightSpeed');
pulse_bw = prop_speed/(2*range_res);
pulse_width=1/pulse_bw;
fs = 2*pulse_bw;
noise_bw =2*pulse_bw;
c=3e8;
lambda=c/fc;
time_bandwidth_product=100;
prf= prop_speed/(2*max_range);
hw=phased.LinearFMWaveform('SampleRate',fs,'PulseWidth',time_bandwidth_product/pulse_bw,'PRF',prf,'SweepBandwidth',pulse_bw,'NumPulses',1);
x=step(hw);
plot(hw);
Honglei Chen
Honglei Chen 2013-7-22
added code format to the comment above.

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回答（1 个）

Honglei Chen
Honglei Chen 2013-7-22
编辑：Honglei Chen 2013-7-22

0 个投票

The plot() function on LinearFMWaveform, plots only the real part of the waveform, so the amplitude is indeed varying.
If you are asking why in each period, the maximum amplitude seems to be varying, that is because in discrete time, you may not always be able to sample right at the peak in each period. However, if you plot
plot(abs(x))
You can see that the magnitude is constant.
HTH

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