The 1st R (actually RA) stands for Radio which is what the radar uses to detect targets.
The 2nd R stands for Ranging which means that the system can determine the range of the target.
Radar!
As far as I know, radar was invented by a Hungarian scientist named Zoltan Bay. That radar was first used in World War II by the British troops.
No world is a stage, and you cannot detect a helicopter unless you have the radar station (radar alone is not sufficient)
Normal radar sends out radio waves to determine the location of an object. Doppler radar can not only find the location of an object or storm, but using something known as the Doppler effect can determine how fast it is moving towards or away from the radar.
RADAR is used for Radio Distance and Direction. Radar is an example of the fourth real dimension of Quaternion "space-time", real dimension r= ct. Space is quaternion with three vector dimensions Ix, Jy and Kz and one real dimension r=ct. RADAR is a manifestation of this real dimension.
Radio
Radio
Radio
RADAR: radio detection and ranging
Radio
S. R. Tuhela-Reuning has written: 'A planar near-field scanning technique for bistatic radar cross-section measurements' -- subject(s): Bistatic radar, Scanning systems, Radar measurement, Radar cross sections, Near fields, Parabolic reflectors, Radar scanning, Multistatic radar
radio
RAdio Detection And Ranging.
W. R Moninger has written: 'Final report, doppler radar data analysis during fiscal year 1980' -- subject(s): Doppler radar
R. Morey has written: 'The effects of conductivity on high-resolution impulse radar sounding, Ross Ice Shelf, Antarctica' -- subject(s): Radar in surveying, Sea ice
RA dio D etection A nd R anging
Rotor, radar, river, racer, razor, refer, rumor, Roger