radar xxline-of-sight (LOS) equation
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- An equation that expresses the radar horizon range (RHR), given by
where RHRs is the radar horizon range in statute miles, h is the antenna height in feet, and a is the object critical altitude, i.e., the target altitude in feet, below which the radar cannot illuminate the object. Note: The RHR is also given by
where RHRk is the radar horizon range in kilometers when h and a are in meters. The effective Earth radius, namely 4/3 times the actual Earth radius, is used in deriving these formulas. The effective Earth radius for LOS varies with carrier frequency. Second-order differentials are neglected. They contribute less than 0.1%. [From Weik '89]
ATIS - Cite This Source - This Definition - antenna height above average terrain, effective height, Radar, radar resolution cell, radio-coverage diagram, radio horizon, radio horizon range (RHR), slant range, smooth Earth