HP 8530A, Руководство по эксплуатации и программированию, Страница: 238 / 439

Time Domain RCS Measurements
Figure 13-8. The Eects of Gating in Time and Frequency Domains
Select Gate Shape
F our dierent Gate shapes are available:
Minimum
Normal
Wide
Maximum
As shown in Figure 13-9 , each of the Gates have dierent passband atness , cuto rate , and
sidelobe levels . T
1
indicates the Gate Span which is the time between the Gate start and stop
indicators . T
2
is the time between the edge of the Gate P assband and the 06 dB Gate stop time .
T
3
(equal to T
2
) is the time between the Gate stop time and the point where the lter rst
reaches the level of the highest Gate Sidelobe . The Gate characteristics for each Gate shape are
listed in T able 13-2 .
Introduction to Time Domain RCS and
Antenna Measurements
13-13