Types Of Radar Transmission Flashcards
Continuous wave
RF continuously transmits and receives
Target info is obtained by analysis of echo Doppler shift
Relative velocity of target obtained
Has two aerials
Purpose of each component in a CW Radar
CW transmitter = Produces the cow output signal
TX aerial = focuses and shapes CW energy into a beam
RX aerial = detects the CW echo signal and sends to mixer
Mixer = produces the Doppler frequency
Receiver = amplifies and processes the Doppler shift frequency
Display indicator = shows processed target echo in display
CW characteristics
Energy path is two way
Low TX power
No clutter
Two aerials
Type of target information
FMCW
Frequency modulated over a fixed range.
Physical problems using FMCW
Need two antennas for TX and RX
FMCW block diagram components
Frequency modulator = changes the Tx frequency scanning up and down linearly
CW transmitter = produces the CW output constant amplitude and freq
Tx aerial = focuses and shapes the CW energy into a beam
Rx aerial = Detects the CW echo signals and sends to mixer
Mixer = Mixes Tx and Rx freq and outputs the freq difference
Receiver = calculates the range from frequency difference
Display = shows range
FMCW radar characteristics
Energy path is two way
Very low Tx power
No clutter
Two aerials
Provides slant range
Information source - difference between Tx and Rx frequencies
