Transcription of RADAR HORIZON / LINE OF SIGHT
{{id}} {{{paragraph}}}
Example: stock market
RADAR HORIZON / LINE OF SIGHT
GROUND CLUTTERWEATHER CLUTTERINTERFERENCERADAR HORIZONSHADOWINGhFEETRNAUTICAL MILESHFEETANTENNAHEIGHTPOINT "H"H = ( h)2500040003000200010,000100050020010050 025020015010050010,000500040003000200010 000500200100502525250200150100500hHSHADO WRRNM' ' 1. RADAR HORIZON and ShadowingFigure 2. Earth Curvature NomographRADAR HORIZON / LINE OF SIGHTT here are limits to the reach of radarsignals. At the frequencies normally used forradar, radio waves usually travel in a straightline. The waves may be obstructed byweather or shadowing, and interference maycome from other aircraft or from reflectionsfrom ground objects (Figure 1).As also shown in Figure 1, anaircraft may not be detected because it isbelow the RADAR line which is tangent to theearths rules of thumb are:Range (to HORIZON ):Range (beyond HORIZON / over earthcurvature):In obtaining the RADAR HORIZON equations, it is common practice to assume a value for the Earth's radius that is 4/3 times theactual radius.
5 10 15 20 25 30 35 150 450 400 350 300 250 200 10 k ft 20 k ft 30 k ft 40 k ft TARGET ALTITUDE (k feet) RADAR AIRCRAFT ALTITUDE 0 10 20 30 40 50 60 70 80 90 100
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: