Pulse train (slow-time view)
Unambiguous range & velocity vs PRF
R
u
(km)
v
u
(m/s)
current PRF
Waveform (X-band, λ = 3 cm)
PRF
1.0 kHz
Pulse width
100 ns
800 Hz
1 kHz
10 kHz
200 kHz
duty > 100% — transmitter cannot be on longer than the PRI
PRI
1.0 ms
Duty cycle
0.01%
R_u
150 km
v_u
7.5 m/s
Invariant R_u · v_u
1125
km·m/s; R
u
·v
u
= cλ/8, fixed by λ
True range
200 km