What is RADAR and its principle in detail?

         THE VBW +THE HEIGHT  OF THE SCANNER

MAXIMUM RANGE:

1. Height of the scanner increases the scanner , the increase of range.
2. Power of the set, marine radar set transmits around 25 to 60 kwt.
3. Wavelength: 10 CMS have extended range as compared to 3cms
4. Pulse Repetion Frequency
5. Pulse Length: Long pulses ensures better maximum ranges than shorter pulses cause , Long pulses  have more wavelength in them.
6. VBW/HBW: The narrower the beam width the greater the directional concentration, increases the range.

ANOMALOUS PROPAGATION:

Super refraction causes an increase in maximum detection range. This is caused due to meteorological factors like temperature inversion.

RANGE ACCURACY:

According to IMO performance standards the error in the range of an object should not be more than 1.5% of the maximum range scale in use or 70 mts whichever is the greater.

BEARING ACCURACY:

According to the IMO performance standards the object should be measured with ( PLUS & MINUS) +-1 degree of accuracy.

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