Changes

User:Crecasens

817 bytes added, 12:05, 30 January 2013

no edit summary

<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [[Image:WEB-FFT3mB.jpg]]<br>

<br>

Following our example, the above picture shows the FFT of the measurement. Y axis represents signal strenght and X axis represents the FFT sample. Note that only the 300 first samples are shown.

Following our example, the above picture shows the FFT of the measurement. Y axis represents signal strenght and X axis represents the FFT We can see a dominant peak centered about samplenumber 16. Note that only This peak should correspond to the 300 first samples are shownmeasured dominant sinus of 4,609KHz on time domain graphic.<br>

The sampling rate used by the equipment with the default modulation is 590Ksps. This means that each sample of the FFT represents 590000/2047=288,2Hz. If the peak is centered about sample 16 it means the frequency represented is 16*288,2Hz=4,611KHz, thus corresponding with accuracy with the calculations made on time domain. We can see other small peaks at about samples 40 and 50. These peaks are due to other reflections on the room at a dominant peak centered about sample number 13longer distance. So here an example of the possibilities of the radar to detect several targets at different distances. By the moment we must center our attention on a single target scenario to keep learning and later we will be able to analyse more complex scenarios.

• ← Older edit
• Newer edit →

Carles Recasens

646

edits