Data Sheet

© RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-LD7 | data sheet 12/2020 - Revision B Page 9 / 23
Radar settings
The K-LD7 features different parameters to adjust the
functionality of the sensor to the needs of different
applications. All parameters are stored in the radar
parameter structure which can be read and write over
the serial interface. The structure and serial protocol
is described in the chapter Instruction Set Description
on page 13.
It is very important to set the distance and speed ran-
ge settings to values that match with the distance and
speed of the expected targets in the detection area of
the sensor.
For example, if the goal is to measure people in the
10m distance range and 25km/h speed range, but
cars are moving at 30m with 70km/h, the 100m dis-
tance range and 100km/h speed range setting must
be used or the threshold offset needs to be increa-
sed until the cars are no longer displayed in the raw
targets.
Wrong settings can generate false sensor out-
puts. It is possible that strong targets outside
the configured distance or speed range can
create false reflections.
Distance range
The distance range parameter defines the maximum
unambiguous distance measurement of the sensor.
For a lower maximal distance range the range resolu-
tion is better but if the distance of a measured target
is higher than the current distance range setting it can
generate wrong measurements. Therefore it is very
important to set the distance range to a setting where
targets are expected.
Table 3: Distance range settings
Max. range [m] Range resolution [cm]
5 5
10 10
30 30
100 100
An approach to work with a lower maximum distance
range is to change the sensor orientation to get a field
of view without moving objects above the maximal
distance range or to increase the threshold offset (de-
scribed in the chapter Threshold offset on page 10) to
reduce the sensitivity of the sensor.
Speed range
The speed range parameter defines the maximum
unambiguous speed measurement of the sensor.
Fora lower maximal speed range the speed resolu-
tion is better and the current consumption is smaller
but if the speed of a measured target is higher than
the current speed range setting it can generate
wrong measurements. Therefore it is very important
to set the speed range to a setting where targets
are expected.
Table 4: Speed range settings
Max. speed
[km/h]
Speed resolution
[km/h]
Typ. frame
duration [ms]
Typ. Supply
current [mA]
12.5 0.1 229 23
25 0.2 114 27
50 0.4 57 34
100 0.8 29 48
An approach to work with a lower maximum speed is
to change the sensor orientation to get a field of view
without moving objects above the maximal speed
range or to increase the threshold offset (described in
the chapter Threshold offset on page 10) to reduce
the sensitivity of the sensor.
To read out data intensive messages RADC
and RFFT it is recommended to work with
the highest baud rate. If the readout time of
the requested data is higher than the typ.
frame duration it is not possible to read out
the frames in real time. By checking the fra-
me number in the DONE message it is pos-
sible to validate real time readout.