User manual

6 AVIONICS
BMS contains a myriad of new avionics enhancements. Some features have been added, while
others have been refined. This section explains these new features and what they do.
6.1
DOPPLER BEAM SHARPENING (DBS)
In all previous versions of Falcon 4, the DBS 1 and 2 modes were taking way too long to draw.
There are mixed opinions as to what the most suitable setting are, therefore two new
configuration variables have been added to the falconbms.cfg:
set g_fDBS1ScanRateFactor 0.25
set g_fDBS2ScanRateFactor 0.05
In addition, the magnification levels were disproportionate to real world magnification levels and
did not reflect the area between the tick marks in DSB1. DSB2 used to provide a magnification of
8:1 versus 64:1, this has now been fixed.
6.2
TRACK WHILE SCAN(TWS) / “TWIZ“
Previously, the Target Acquisition Cursor attached itself to targets even with radar lock or
designation broken, or gimbal limits exceeded. This has now been fixed.
6.2.1.1 TWS (Track-While-Scan) Radar Sub-mode
The TWS radar mode has undergone a complete overhaul in how it is mechanized. It should
operate much more like the real thing than ever before. This includes the number of targets it can
track at once (which was previously unlimited), how it builds and maintains track files, how it
dumps them and the azimuth and elevation limits of TWS.
6.2.1.2 How to use TWS (Twiz)
To switch to the CRM-TWS (combined radar mode) sub-mode, the pilot may either hit OSB 2
three times or TMS right to switch from CRM-RWS to CRM-TWS. Upon entering TWS, the radar
azimuth will initialize to an “A2” or 50 degree azimuth scan (25 degrees on either side of
boresight) and the elevation will initialize to a 3-bar “3B” scan.
6.2.1.3 TWS Mechanization
As its name implies, TWS tracks multiple targets while searching for others. It is mechanized to
begin forming track files (triangles, or hollow squares with a tic if you’re using EPAF radar cues)
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