User's Manual

ED 3038 G 232 / 01 (2002-06)
Operating Instructions
9 Collision Avoidance (TCPA, CPA)
b_r1_e27.fm / 21.06.02
77
RADARPILOT / CHARTRADAR
9 Collision Avoidance (TCPA, CPA)
Subjects of this Section:
◆ Computations for collision avoidance; setting of the TCPA and
CPA limits
For TCPA (Time to Closest Point of Approach) and CPA (Closest Point of Approach), limits can be set
such that, if the actual values fall short of these limits, the DANGEROUS TGT alarm will appear. If the
danger computation is switched on, the radar computes the TCPA and CPA values for all targets being
tracked. If these values fall short of the set limits,
-the DANGEROUS TGT alarm appears,
- the target which has caused the alarm is indicated on the PPI by means of the flashing symbol ,
- the target data display is automatically switched on with this target at the first place, and the symbol
is marked with the target label.
☞ The computation is performed not only by the ARPA radar but also by the EPA radar. In the latter,
however, the results are less reliable because the target data on which the computation is based are
old and might therefore be incorrect. A reliable display can be obtained only if plotting is performed
frequently enough.
Switching the Computation for Collision Avoidance On and Off
Click on the CPA or TCPA area, and then click on OFF.
Changing the TCPA Limit
Click on the TCPA area, and then click on the desired value, or click
into the upper numerical area and enter the value by means of the
virtual keyboard.
Changing the CPA Limit
Click on the CPA area, and then click on the desired value, or click
into the upper numerical area and enter the value by means of the
virtual keyboard.
1.DO
0.1 NM
0
.
2
NM
OFF
CPA LIM
10 min
0.5 NM
or 1.DO
2.DO
1.DO
CPA LIM
5 min
10 min
15 min
30 min
10 min
OFF
2b.DO
10 min
0.5 NM
2a.DO
1.DO
CPA LIM
0.1 NM
0.2 NM
0.5 NM
1 NM
0.5 NM
OFF
2a.DO
10 min
0.5 NM
2b.DO