SOURCEFORGE » RALF » 2015 Quantitative analysis of RF signals

h1. 2 Simulation

First we decided to design our signal analyser and to test it with simulated signals generated automatically such as sine wave.

To do this we first created a VI able to generate a noisy signal. This signal correspond to the addition of three basic signals and a white Gaussian noise. For each basic signal we can set the signal type, the frequency, the amplitude and the offset. For the noise, we can set the noise standard deviation.

Consequently we can insert the noisy signal into our signal analyser to test it.

For example if we set 3 sine waves with different frequencies and amplitudes we observe this spectrum

!3sinus.png!

+Figure 1: Power spectrum of three different sine waves+

We can also observe the spectrum of a noisy sine wave

!sinus_and_noise.png!

+Figure 2: Power spectrum of a noisy sine wave+

In the two cases, the spectrum match with the expected values (frequencies and amplitudes)