| 摘要 |
1. A radar system comprising means for radiating pulse-modulated electromagnetic energy, means for receiving said energy after reflection from a target, means for generating pulses, said generated pulses being applied to said radiating means for control of the radiated energy therefrom, near and far pulse gate generators each producing a pulse during a discrete time interval between successive pulses of said radiated energy and during which reflected energy may be received, said time intervals not exceeding the time corresponding to the maximum range of said radar system, said pulse generating means being coupled to said gate generators for triggering thereof, a pulse distributor, said pulse distributor being coupled to the output from said receiving means and to said gate generators whereby said pulse distributor applies said receiving means output occurring during one gate interval to one output line and that occurring during the other gate interval to another output line, a pair of averaging means, each said averaging means connected to one of said pulse distributor output lines, a differential amplifier receiving the outputs from each of said averaging means and supplying an output proportional to the differential amplitude therebetween, said amplifier being adapted to produce a zero output in the absence of reflected energy being received during either of said near and far gate intervals and in the presence of reflected energy during one of said gate intervals being adapted to produce an output having a finite value with a polarity indicative of which of the two said gate intervals is coincident with said reflected energy reception.
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