Chapter 7: Radar Systems Flashcards
range of target (R) formula
R = (c*td)/2 = 150td meters
where td is in μs
time delay range for pulse modulation detection method
0.1 - 50μs
what does the duplexer do in the radar system?
allow the use of same antenne for both transmission and reception
what does the mixer-local oscillator (LO) do?
convert RF signal to intermediate frequency (IF) signal
2 types of radar display system
1) A-scope
2) Plan Position Indicator (PPI)
how does a A-scope radar work?
sweep waveform to horizontal/vertical deflection plates in the cathode ray tube
how does a plan position inidcator work?
circular sweep, radiation beam will hit the target, reflection will be received
pulse techniques in radar system
1) Carrier Freq
2) PRF
3) Pulse Width
4) Power relation
5) Pulse Modulation
6) Thermal Noise
signal to noise ratio formula
SNR = signal power / noise power
what is range resolution?
radar’s ability to display in-line targets separately
azimuth resolution on radar screen depends on?
beam width
