RADAR
RAdio Detection And Ranging
Targets ?
Range ?•Distance
R
How to find out the location of the target?
How to find out the velocity of the target?
• By measuring frequency shift using Doppler effect.
1 nmi (nautical mile) = 1.852 Km
----Pulse compression
Klystron or TWT or transistor amplifierOr power osc. Like magnetron
Low power signalw/g
Mechanically/Electronically steered planar/phased array
Scan
PPI (plain position indicator)
Not necessarily the limits, may use up to 240 GHz (mm wave radar)
Radar equation becomes
Integration methods
When to use pre / post detection integration?
Typical scan timeApplications
General 10 - 12 seclong-range military 4 secshort-range military 1-2 sechigh resolution radars 1 sec
Solution
To obtain more complete coverage