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The radar mile is the time it takes for a radar pulse to travel one nautical mile, reflect off a target, and return to the radar antenna. Since a nautical mile is defined as 1,852 m, then dividing this distance by the speed of light (299,792,458 m/s), and then multiplying the result by 2 yields a result of 12.36 μs in duration.
Radar is an acronym for "radio detection and ranging", referring to a system for using radio waves to detect and track the position of objects. Radar may also refer to:
The acronym RADAR (for RAdio Detection And Ranging) was coined by the U.S. Navy in 1940, and the subsequent name "radar" was soon widely used. The XAF and CXAM search radars were designed by the Naval Research Laboratory, and were the first operational radars in the US fleet, produced by RCA.
AN/APS-21 search radar by Westinghouse Electric (1886) for part of AN/APQ-35 for Douglas F3D Skynight and Gloster Meteor NF; AN/APS-23 search radar by Western Electric for Convair B-36 North American B-45C Tornado Boeing B-47E Stratojet B-50 Superfortress B-52 Stratofortress Lockheed C-130 Hercules and Boeing C-135 Stratolifter part of AN/ASB-3
Abbreviation Term Notes M medium Wake turbulence category: MAC mean aerodynamic chord: MAC mid-air collision: MAHF Missed Approach Holding Fix Used in RNAV MANAB Manual of Word Abbreviations [15] Used in Canada MAP manifold absolute pressure: MAP missed approach point Or: MAPt. Instrument approach. MAPS Minimum Aviation Performance Standards MATS
The radar measures the distance to the reflector by measuring the time of the round trip from emission of a pulse to reception, dividing this by two, and then multiplying by the speed of light. To be accepted, the received pulse has to lie within a period of time called the range gate .
A plan position indicator (PPI) is a type of radar display that represents the radar antenna in the center of the display, with the distance from it and height above ground drawn as concentric circles. As the radar antenna rotates, a radial trace on the PPI sweeps in unison with it about the center point. It is the most common type of radar ...
The definition of Z above shows that a large number of small hydrometeors will reflect as one large hydrometeor. The signal returned to the radar will be equivalent in both situations, so a group of small hydrometeors is virtually indistinguishable from one large hydrometeor on the resulting radar image.