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3. TARGET TRACKING (TT)
3-25
Indirect echoes
A target at close range is usually picked up directly, but it can also be received as re-
flection from a large, flat surface. This will result in the radar presenting two or more
echoes on the display, each at a different range. The TT system can acquire and track
a false echo if it is detected in five consecutive scans. Reduction in radar gain can
eliminate the multiple echoing but care should be taken as range detection also will be
reduced.
Radar interference
If interference is extreme due to another radar operating at close range, spiral "dotting"
and/or false targets may appear momentarily. The interference rejector can clear the
display.
Delay of sensor input
If the refresh rate of the gyrocompass signal is too slow, error in target bearing occurs
when own ship turns. To prevent this error, the refresh rate of the gyrocompass signal
must be as indicated in the System Configuration drawings.