Overlapping Footprints And Multipath Effects - Bosch Integrus Installation And Operation Manual

Integrus
If the audience is always directed towards the radiators, you do not need radiators at the back
(see Figure 4.15).
Figure 4.15 Radiator positioning in a conference hall with auditorium seating and podium
If the path of the infra-red signals is partially blocked, e.g. under balconies, you should cover
the 'shaded' area with an additional radiator (see Figure 4.16).
Figure 4.16 Radiator for covering seats beneath a balcony
4.2.6

Overlapping footprints and multipath effects

When the footprints of two radiators partly overlap, the total coverage area can be larger than
the sum of the two separate footprints. In the overlap area the signal radiation power of two
radiators are added, which increases the area where the radiation intensity is larger than the
required intensity. However, differences in the delays of the signals picked up by the receiver
from two or more radiators can result in that the signals cancel each other out (multi path
effect). In worst-case situations this can lead to a loss of reception at such positions (black
spots).
Figure 4.17 and Figure 4.18 illustrate the effect of overlapping footprints and differences in
signal delays.
Bosch Security Systems B.V. Installation and Operation manual
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IOM-INT | V1.1 | 2010.12