Figure 5 Radius Operation Modes - Kongsberg Seatex RADius 1000 Technical Description

Kongsberg Seatex RADius
RADius measures range based on the FM-CW radar principles. It sweeps the frequency
transmitted and mixes the transmitted signal with the received signal. The transmitted signal
has changed frequency during the flight time of the received signal and it is the difference
between the transmitted frequency and the received frequency that is measured. This
frequency difference is proportional to twice the distance to the transponder.
High precision
range
10m
200m
Accuracy:
Bearing < 0.5º
Distance < 0.5 m
The RADius characteristics are determined from the measuring principles. This leads to
different performance at different ranges. The accuracy is best at close range. Between 10 -
200 metres is optimal accuracy is acquired. Between 200 - 500 metres distance and bearing is
measured but the accuracy is degraded due to the nature of angle measurements. Beyond 500
metres, the system acquires the transponders but only with range measurements. These can be
used to verify the functionality of the system (typically prior to entering 500-metre safety
zone).
Tracking range
500m
Limited bearing
accuracy

Figure 5 RADius operation modes

8
Technical description, rev 0
Acquisition range
Distance only
1000m