Overlapping Footprints And Multipath Effects - Bosch INTEGRUS Installation And Operating Manual

INTEGRUS | Installation and Operating Manual | System description and planning
Figure 1.14 Combination of several reflected signals
For concentrically arranged conference rooms, central-
ly placed, angled radiators located high up can cover
the area very efficiently. In rooms with few or no
reflecting surfaces, such as a darkened film-projection
room, the audience should be covered by direct path
infra-red radiation from radiators positioned in front.
When the direction of the receiver changes, e.g. with
varying seat arrangements, mount the radiators in the
corners of the room (see figure 1.15).
If the audience is always directed towards the radia-
tors, you do not need radiators at the back
(see figure 1.16).
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 1.17).
The figures below illustrate the positioning of the
radiators:
Figure 1.15 Radiator position for covering seats in a square
arrangement
Bosch Security Systems | 2003-02 | 3122 475 22011en
Figure 1.16 Radiator positioning in a conference hall with
auditorium seating and podium
Figure 1.17 Radiator for covering seats beneath a balcony
1.3.6 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 sig-
nal radiation power of two radiators are added, which
increases the area where the radiation intensity is larg-
er 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).
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