12-12-2012, 06:25 PM
introduction of radar &radar waveforms & maximum unambiguous range
introduction of radar.pptx (Size: 344.41 KB / Downloads: 26)
introduction of radar
WHAT IS RADAR?
Radar was secretly developed by several nations before and during World War-II. The term RADAR was coined in 1941 by the United States Navy as an acronym for RAdio Detection And Ranging
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects
It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter.
maximum unambiguous range
The maximum unambiguous range (Rmax) is the longest range to which a transmitted pulse can traveland return to the radar before the next pulse is transmitted.
In other words, Rmax is the maximumdistance radar energy can travel round trip between pulses and still produce reliable information.The relationship between the PRF and Rmax determines the unambiguous range of the radar. the greater the PRF (pulse repetition frequancy),the shorter the maximum unambiguous range (Rmax) of the radar.
RADAR APPLICATONS
The first use of radar was for military purposes: to locate air, ground and sea targets
radar systems are used to monitor and regulate ship movements in busy waters
Police forces use radar guns to monitor vehicle speeds on the roads
Meteorologists use radar to monitor precipitation. It has become the primary tool for short-term weather forecasting and watching for severe weather such as thunderstorms, tornadoes, winter storms, precipitation types, etc