January 2016
Beginner to intermediate
430 pages
22h 38m
English
Content preview from Radar and ARPA Manual
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320
RADAR AND ARPA MANUAL
Consider the situation as shown in Figure 7.34. The
true situation is as follows:
Own ship course: 000°(T) speed: 7 knots
Target ship course: 270°(T) speed: 7 knots
Target range is 10 n mile on a bearing of
045°.
The origin is tracking correctly at a constant rate.
Note (a) On a relative-motion display, the target will
remain on a steady bearing and will be on a range ring
every 12 minutes (own vessel will travel 1.4 n mile in 12
min).
(b) Tracking is controlled by the true-motion unit,
whereas linearity depends upon the timebase generator.
Figure 7.35 shows the effects manifest when the spot
(a) accelerates and
(b ...
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