RADAR = Radio DetectionandRanging
motion: Chaotic (limbs, body)
Occurrence : indefinite
Periodical (breathing, heartbeat)
Duration: 3 to 6 seconds breathing
Heartbeat 0.5 to 1 second
Intensity: determined by the size of the reflecting surface Penetrable obstacle
Distance law, the energy per unit area decreases with r ² With reflection on the way back? Damping absorption law - exponentially - frequency dependent
The antenna emits a 55° cone
Display of the received echo.Compared with acoustics, this would equal the volume. A selection of pitch or even rhythms is not yet done.The two curves are different viewing angle to the echo coming back polarized due to the reflection. Depending on the polarization the wave may even appear as a flat line.neither the overlay nor the volumeareimportant.
In this diagram the echo is decomposed into its frequencies (low frequency bottom, high frequency top)The brightness indicates how strong the echo of a certain frequency is.In addition, the response over time is shown.The "amount" of echoes of a frequency over time is the chart on the next slide.The grey lines show the areas where the software recognizes signal patterns corresponding to biometric conditions.The information in the diagram indicates that a significant signal with a frequency of 0.42 Hz was recognized.The signal was seen in total for 44 seconds and uninterrupted for 27 seconds.
Here, the received echo is decomposed into its frequencies.But the height of the peaks does not correspond to the effective “volume ", but as a sum over the time.
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