NARDA IDA, Руководство по эксплуатации, Страница: 142 / 292

7 Direction Finding Mode
134
IDA - 3106 Narda
7.4 Horizontal Scan
Horizontal Scan
plots the signal strength versus the angle of incidence on a
polar diagram. The measured signals are normalized to the maximum value
linearly during the measurement (1 = 100 % signal strength). The display allows
you to more easily see the difference between the received signal and the
reflections that occur. The IDA - 3106 automatically calculates the bearing of the
signal source based on the horizontally measured values.
The calculation of the main angle of incidence is performed where possible
using a quadratic regression of the measured values obtained. Otherwise,
the azimuth angle of the maximum level is assumed to be the direction of
transmission and a message to this effect is displayed.
To select the Horizontal Scan function:
 Press the
Horizontal Scan
softkey until
On
appears.
Figure 25:
Direction Finding
mode,
Horizontal Scan
function.
The following measurement procedures are available:
•
Continuous Horizontal Scan (Continuous)
(see page 135)
•
Discrete Horizontal Scan (Discrete)
(see page 136)
•
Discrete Horizontal Scan with Max Hold (Discrete with Max Hold)
(see page 137)
You can also determine the bearing manually if the bearing calculated on
the basis of the measured values does not appear to be sensible; see
Horizontal Scan and manual determination
on page 138.