Navigation General · Radar Principles
Compared to S-band (10 cm) radar, X-band (3 cm) radar generally provides:
- AGreater range in heavy rain and a broader antenna beam
- BBetter target definition and shorter minimum range, but is more affected by precipitation attenuation✓ Correct
- CLonger maximum range and better penetration of precipitation
- DLower peak power requirements and immunity to sea clutter
Explanation
X-band (3 cm) radar offers finer bearing and range resolution due to its shorter wavelength and narrower beam, giving better target discrimination in congested waters. However, its shorter wavelength is attenuated more severely by rain. S-band (10 cm) radar penetrates precipitation better and has a longer usable range in heavy weather.
Authority: Radar Navigation Manual (Pub. 1310), Ch. 2
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