SYMEO Local Positioning Radar System
Product Family LPR
®
-1DHP-200 – Product Documentation
Radar Basics
Copyright © Symeo GmbH 2018
DOC.EDO.000341.WORK.EN_LPR-1DHP-200_Product-Documentation.docx
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(dependent on target size, shape and material). In secondary radar mode noise is
constant within the specified range and will increase for ranges above.
Temperature drift
o
Changes in device and air temperature can lead to measurement offsets of approx.
+/-10mm. These errors vary slowly with time and can be countered by ensuring
constant environmental conditions, running a warm up phase of 30 minutes before
operation or by using a calibration reference.
3.7 Range
To maximize the range of a LPR
®
-1DHP-200 measurement setup the following aspects have
to be taken into account:
Mounting position
o
Adhere to the mounting instructions (see chapter 5). Ensure minimum alignment error
and vertical / horizontal offset and equal orientation (for secondary and diversity radar
mode)
Fresnel zone
o
Ensure the Fresnel zone is free of absorbing or reflecting objects
Reflective surfaces and objects
o
Reflections of the radar signal, e.g. from walls, can lead to a reduction of the received
signal strength and hence maximum range. Ensure the recommended clearance to
surfaces and objects described in chapter 5.1 or use diversity radar mode to counter
the effects caused by reflections
Target RCS (only primary radar mode)
o
In primary radar mode the maximum range depends on the target RCS (radar cross
section) which is a function of target size, material and shape. If the maximum range
is required use targets with a high RCS (e.g. the corner reflector MTE000958)
VGA value
o
For maximum range set the “VGA value” to the highest possible value that is allowed
in you regulatory domain. The WebUI will use your region settings to limit the “VGA
value” and hence range is reduced in certain regions (see chapter 10).
The minimum range of the sensors can be reduced to values below the specified minimum
distance by adapting the “VGA value”, the “RX attenuator” and the threshold settings (for
primary radar). This however affects the maximum range and the accuracy of the radar and
shall therefore only be applied by trained personell.
