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Estimated range on radar
Since the radar beam is not normally deflected much, it can be said that the height of the antenna and the height of the target
determine the range (+ that the target gives a usable stable echo)
���� = 2.23 ( √ ℎ1 + √ ℎ2) Height in meter and distance D will be in Nm
Simple memory rule 10m ant height and 10 m height on the target, then it should be displayed at 15NM.
If the antenna height is 10m and you see a target of 64NM, you can assume that the target has a height above 660m.
Deflection of radar signal
Temperature layers can cause deflections that affect range
Even temperature gives the right beam
Cold air over warm seas can bend the radar beam
Warm air over the cold sea will be able to bend the beam down and you can see echoes "below" the horizon.
JMR-5400 User Manual 20201214 temp
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