Wiki » History » Version 6
Version 5 (MERIOCHAUD, Antoine, 12/12/2015 04:56 PM) → Version 6/43 (MERIOCHAUD, Antoine, 12/12/2015 05:09 PM)
h1. Report
h2. Introduction
Satellites are a quite new and growing way to improve different ways to communicate all over the world. In order to establish this communication, signals must be transmitted between a satellite and the ground station. To be readable on the two ways, these signals must comply some specifications and to check that this is the case, we can use for example a signal analyser.
Signal analyser
Assess quality of signals
Figure of merit, characteristics
h2. Scope and objectives
Labview
ni-USRP 2950 R : characteristics, block diagram
Antenna : Ku band, X-band ?
Satellites to target
Measurements to carry out : Analogic vs digital
h2. Implementation
h3. Definition of inputs and ways to compute the outputs
h3. 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 <warning>mettre photo</warning>
We can also observe the spectrum of a noisy sine wave <warning>mettre photo</warning>
In the two cases, the spectrum match with the expected values (frequencies and amplitudes)
h3. Moving from simulation to acquisition of real signals
When he tried to replace the
Definition of inputs and computation models of the outputs
Simulation
Generation of a noisy signal + analogic and digital measurements ⇒ do the results match what is expected ?
Expected issues when we move to the acquisition of the real signal ?
h2. Tests and results
Explanation of the commands and operations to reach the presented results + comparison between what is display by the signal analyser and by Labview + explanations
h2. Introduction
Satellites are a quite new and growing way to improve different ways to communicate all over the world. In order to establish this communication, signals must be transmitted between a satellite and the ground station. To be readable on the two ways, these signals must comply some specifications and to check that this is the case, we can use for example a signal analyser.
Signal analyser
Assess quality of signals
Figure of merit, characteristics
h2. Scope and objectives
Labview
ni-USRP 2950 R : characteristics, block diagram
Antenna : Ku band, X-band ?
Satellites to target
Measurements to carry out : Analogic vs digital
h2. Implementation
h3. Definition of inputs and ways to compute the outputs
h3. 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 <warning>mettre photo</warning>
We can also observe the spectrum of a noisy sine wave <warning>mettre photo</warning>
In the two cases, the spectrum match with the expected values (frequencies and amplitudes)
h3. Moving from simulation to acquisition of real signals
When he tried to replace the
Definition of inputs and computation models of the outputs
Simulation
Generation of a noisy signal + analogic and digital measurements ⇒ do the results match what is expected ?
Expected issues when we move to the acquisition of the real signal ?
h2. Tests and results
Explanation of the commands and operations to reach the presented results + comparison between what is display by the signal analyser and by Labview + explanations