Download Radar and ARPA Manual by A. G. Bole and W. O. Dineley (Auth.) PDF

By A. G. Bole and W. O. Dineley (Auth.)

This guide is a accomplished sensible reference for mariners on board send and bosses ashore, but in addition offers all crucial info for applicants following ENS, radar observer certificates classes

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Extra resources for Radar and ARPA Manual

Example text

Use when short range scales are selected Good. Use when long range scales are selected and for poor response targets at short range Minimum range Good. Use when short range scales are selected Poor. Use when long range scales are selected and minimum range is not a major consideration Range discrimination Good Poor Effect on echo paint Short radial paint. Produces a well defined picture when short range scales are selected Long radial paint when short range scales are selected but the effect is acceptable when long range scales are selected Effect on sea clutter Reduces the probability of the masking of targets due to saturation Increases the probability of the masking of targets due to saturation Effect in precipitation Reduces the probability of the masking of targets due to saturation Increases the probability of the* masking of targets due to saturation.

4). In certain special circumstances, such as those where targets are difficult to detect against the background of sea or weather clutter, the use of a short pulse may improve the probability of detection of a wanted target. 3). Two, three or even four pulse lengths may be available, according to the complexity of the system design. 3 JUS. It is likely that the pulse length produced by the system in any given circumstance will depend on both the pulse length requested by the observer and the range scale selected.

The flaring was necessary for reasons of impedance matching which are beyond the scope of this text. The device was known variously as a flare, a hog horn or simply a horn. The latter term is quite descriptive because, in its effect on microwaves, the behaviour of the device is somewhat , analogous to that of an acoustic horn. 8(b). A further departure from the ideal arises because the wavelengths used in marine radar are not negligible when compared with the size of the reflector, as would be the case with visible light.

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