←
Doppler Effect
Skolnik — Doppler Frequency Shift in Radar
Radar
Carrier Freq f
c
(GHz)
10
— Presets —
Automotive (77 GHz)
X-band (10 GHz)
S-band (3 GHz)
K-band (24 GHz)
UHF (433 MHz)
Target
Radial Velocity (m/s)
30
Approach Angle θ (deg)
0
Pulse-Doppler
PRF (kHz)
10
Number of Pulses N
32
Computed
Wavelength λ
—
Doppler f
d
—
Effective velocity
—
Unambiguous v
max
—
Velocity resolution
—
Doppler Shift
f
d
= 2v cos(θ) / λ
Approaching (↗) → positive f
d
Receding (↘) → negative f
d
PRF limits:
v
max
= λ PRF / 4
Velocity aliasing if |f
d
| > PRF/2