Search and Rescue Radar Transponder under Dynamic Operating Conditions

P. Ivančić et al: Search and Rescue Radar... 1. MODEL FOR CALCULATING THE TRANSPONDER’S RADIO HORIZON / Model za izračun radio horizonta odgovarača The radar horizon is typically calculated according to the radio horizon pattern derived from the calculation of the geometric horizon [8]. The geometric horizon (Gh) for the values: r – radius of the Earth ≈ 6378 km or 3440 NM ha – height of aerial above sea level Gh – geometric horizon is calculated according to the pattern: 2 2 2 2 2 ) ( ) ( r h r G r h r G a h a h − + = ⇒ − + = (1.1.)