Radar Field Analyser - RFA641 Edition Date: 28-Feb-18
obtain a useful antenna diagram, the pulses shown should at least cover a dynamic range of 40dB.
4. The blue cursor, Boresight, determines the detection of boresight. To have correct boresight
detection, this cursor should be set above the sidelobes and lower than the boresight maximum of
the radar of interest. When a number (default: 5) of pulses above boresight are detected (taking into
account the selected timing and extraction method), boresight is declared. Using the boresight
positions, the revolution time is calculated. Figure 29 is a good example of the correct positioning of
the Threshold and Boresight cursors
5. If you now click the HPD button, the HPD will be extracted.
6. The HPD graph is drawn in the graph and the scale changes to degrees.
7. When the extraction process was successful, the Time indicator will show the calculated revolution
time and the antenna diagram will appear in the graph. If the extraction process was not successful,
and the revolution time could not be calculated, the Time indicator will display its default value (5.00
s) in red.
8. The Index slider in the right hand bottom corner of the window indicates the number of revolutions
found. The HPD is now shown as amplitude [dB] or [dBm] versus azimuth (°) graph.
9. Depending on the Rel/Abs switch in the Set Up field, the graph is shown in an absolute dBm scale
or a relative dB scale. In Absolute position, the dBs are real dBms, received at the RFA input. In
Relative position, the data is shown relative to the maximum value detected in boresight (made
equal to 0 dB).
10. The View RFA Pulses program by default assumes that a detected revolution corresponds to 360
degrees. In case you have performed a recording of an antenna with a certain scan width performing
a linear scan movement versus time, it is possible to enter a scan width differing from 360 degrees.
To do this click the Parameters button and enter the width in the Scan Width parameter.
IE-UM-00165-005 RFA641 User Manual.odt 34/110
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