investigating Inconsistent STT / TWS Auto scan centering, especially when TWS is entered from STT or FACQ is used

[Ogata_Rina]

1. When commanding AACQ from RWS with a valid trackfile (radar has existing azimuth and elevation data for that target), the auto acquisition scan center is sometimes completely off from the target. From the track that I provided, when I play it back, sometimes the AACQ acquisition scan volume would be completely centered around the trackfile, and sometimes it would be either offset from up or down, indicating incorrect elevation setting.

2. When commanding TWS from STT with the DDI pushbutton, sometimes TWS Auto scan center would be completely off the target either up or down. Quoting from latest F/A-18 Early Access Guide EN (Page 174):
 

引用

AUTO: The azimuth and elevation TWS scan is centered on the L&S trackfiles. If TWS is entered from an STT track, AUTO mode is automatically selected. When in AUTO mode, the player should be able to place their TDC cursor anywhere but on a contact and depress the TDC switch to re-center the scan azimuth on that location. When this is done, AUTO is replaced with BIAS on the display. This sets a new scan centroid. BIAS is removed when RESET is pressed, TWS is exited, RAID is selected, MAN mode is selected, or no trackfile exists.

Looks like in TWS Auto it should be automatically centered on L+S target or target centroid. This behavior is currently very inconsistent, and sometimes the scan centroid will place the target right at the edge of the scan center when there are no other targets present, causing it to lose track inconsistently when the radar contact itself is solid.

Anyway, track is attached. Notice scan center is inconsistent after commanding STT or commanding TWS from STT. When I commanded TWS for the last time inside 40 miles, the scan center placed the trackfile on the top the scan volume, causing it to lose track after I shot the AIM120. This defeats the purpose of TWS Auto in the first place.

From my last post on TWS BIAS, someone posted an unclassified source document that was taken down, and that document has complete description on how TWS and STT scan centering should work.

STT_TWS_Antenna_centering.trk

[Tholozor]

I have a thread for part of this over here marked as "investigating": 

 

[Ogata_Rina]

Well if they're gonna merge with the prev thread go for it, otherwise consider this as a 1yr bump.