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Security Escort
4.4.2
Improving the location accuracy of an installation
Once we have identified those areas that must be improved, what are the options to improve
the computed location accuracy?
Notice!
All changes using the following steps could potentially change the computed locations for all
alarms at or around the changed area. Therefore, after any change is made, the entire vicinity
around the changed area must be verified.
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Robert Bosch (SEA) Pte Ltd
Typically the first thought is to add more SE receivers in the problem area. Generally this
is a bad approach. If the system was properly designed using the recommended grid
layout, adding extra SE receivers in any area of the grid will distort the response in
adjacent areas and floors. While it may seem to fix the problem area, typically it will
create more problems in adjacent areas. The exception is when an area is shielded by
something such as wire mesh in the walls that prevent the RF transmitted signal from
passing through. Therefore, additional SE receivers may have to be added in the shielded
area to ensure that all alarm transmissions will be heard.
Verify that the location of the SE receivers in the Transponder Database is accurate to
their physical location, and the SE receivers are indicated to be at the correct floor level.
It is also important that SE receivers that were physically stacked directly above one
another on floors of a building are also located at the same X and Y coordinates in the
database.
Try changing the Transponder Database location of SE receivers (not the actual physical
location) one at a time while testing the alarm location response, using one of the testing
methods above. For example, if alarms are getting pulled outside a building in one area,
move the closest SE receiver (in the Transponder Database) to that area a little further
into the building and retest. If the area can be corrected using this method, verify the
surrounding areas to make sure they were not adversely affected. It is generally better if
the correction is done in small steps while verifying the adjacent areas, rather than trying
to correct the entire error in one step.
The Security Escort software allows individual SE receiver sensitivity to be set in the
Transponder Database. SE receivers can be adjusted from 50% to 149% of their normal
sensitivity. No physical SE receiver changes or upgrades are required. Try changing the
Transponder Database sensitivity of SE receivers one at a time while testing the alarm
location response, using one of the testing methods above. For example if alarms are
being pulled towards a particular SE receiver, lower its sensitivity in 10% increments and
retest. If the area can be corrected using this method, verify the surrounding areas to
make sure they have not been adversely affected. It is generally better if the correction
is done in small steps while verifying the adjacent areas, rather than trying to correct
the entire error in one step.
There are five different location algorithms that can be selected on an individual receiver
basis in the Transponder Database. "Classic" (original Security Escort algorithm),
"Linear", "Low" pull, "Medium" pull and "Strong" pull. By default, when an SE receiver is
set for outside or tunnel, it will use the "Linear" algorithm and all other SE receivers will
use the "Low" pull algorithm. The SE receiver that hears the alarm transmission the
strongest will determine the algorithm used for this alarm. Changing the Transponder
Database algorithm setting for an SE receiver only affects the location when the alarm is
close to this SE receiver and it hears the alarm the strongest. Change the Transponder
Database algorithm setting for an SE receiver and test in its area, using one of the testing
Technical Reference Manual
Equipment estimation | en
2018.03 | SE3v1.0 | DOC
29
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