Radar Field Analyser - RFA641 Edition Date: 28-Feb-18
6. When all channels are measured, click the Save button to save the measurement data to disk.
The VI will prompt a standard file dialog, by default pointing to the CALIB subdirectory of the MSSR
or PSR subdirectory of the active campaign folder. Type in the desired file name and save the data
on disk or select Cancel if you do not wish to save the results.
4.4. Sectorial STC
4.4.1. Theory
The Sectorial STC measurement result consists of an RF input power versus time table presented versus
azimuth. To be able to measure the gain vs. time delay, the RFA641 needs to be synchronised to the
interrogation signal of the radar under test.
The interrogation trigger signal is used both as start of range and as azimuth indicator. Due to limitations of
the RFA641 digital input hardware, only two timing signals can be connected simultaneously. Therefore the
interrogation count is also used to calculate azimuth.
The RFA641 will inject pulses of a fixed (selectable) power level into the receiver. The (M)SSR’s analog
video output signal is then sampled by the RFA641. This amplitude is passed through the calibration curve in
order to build the STC curve: a gain (dB) versus time delay curve.
4.4.2. Getting Started
The Sectorial STC is loaded from the RASS-S Toolbox using the Rx button.
Make the connections as shown in Annex 5: Sectorial STC Calibration Connection Diagram.
Make sure to connect the radar’s interrogation trigger signal to the ACP input connection of the RFA641
instead of to the TRIGGER (P1-P3) input. This measurement is repeated for a number of interrogations in
each revolution, depending of the number of sectors to be measured.
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