12 Radar Systems of Maritime Transport
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Fig. 12.5 Forming of RBT response signal
Fig. 12.6 Examples of radar screen when RBT position at more than 2 miles from radar, about 1
mile, close to radar (less than 0.2 miles). Radar scale is 10 miles
The actual location of the rescue vehicle with switched-on of RBT on radar screen
is in the area of the blip closest to the center of the screen. In some cases, the closest to
the center SART blips are difficult to discern against the backdrop of near reflections
from sea waves. The blips near the center of the indicator become indistinguishable
against the backlight. Determining the distance to the responder in such a situation
is difficult. The last blips are usually clearly visible. In this case, it is possible to
extrapolate the position of the first blip and thus determine the location of transponder.
This blip is approximately 8.1 nautical miles away from the most distant one.
The operational requirements for RBT are stated in Resolution A.802 (19). In
accordance with this Resolution, the RBT should satisfy the following requirements:
219
Fig. 12.5 Forming of RBT response signal
Fig. 12.6 Examples of radar screen when RBT position at more than 2 miles from radar, about 1
mile, close to radar (less than 0.2 miles). Radar scale is 10 miles
The actual location of the rescue vehicle with switched-on of RBT on radar screen
is in the area of the blip closest to the center of the screen. In some cases, the closest to
the center SART blips are difficult to discern against the backdrop of near reflections
from sea waves. The blips near the center of the indicator become indistinguishable
against the backlight. Determining the distance to the responder in such a situation
is difficult. The last blips are usually clearly visible. In this case, it is possible to
extrapolate the position of the first blip and thus determine the location of transponder.
This blip is approximately 8.1 nautical miles away from the most distant one.
The operational requirements for RBT are stated in Resolution A.802 (19). In
accordance with this Resolution, the RBT should satisfy the following requirements: