For a pulse with P_{peak}
power and t_{p}
pulse width the energy in one pulse can be given by .
The total energy spent in one second will be ,
where F is the pulse firing rate (PFR). Thus the average power that is being
spent per second is .
This leads to the conclusion that, for a given power and pulse width the PFR
is inversely related to peak power of pulse. With the increase in altitude
(range) one needs the pulses with higher peak power. For same value of P_{av}
and t_{p},
thus with increase in altitude the PFR will reduce. This is reflected in the
specifications of various sensors.