More explanation about the 'three' issues of the HMDS at this website.
F-35 helmet’s jitter problem should be fixed by this summer 30 May 2012
[text from InsideDefence:
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F-35 helmet’s jitter problem should be fixed by this summer by Barry Graff 30 May 2012
[Have no idea why the 'blog spot [all one word]' is replaced by the string of asterisks - but whatever. BTW
www.a4ghistory.com is back up]
http://whythef35.********.com.au/201...should-be.html
"...The
third and final issue with the helmet – image latency:
The third challenge to the HMDS' functionality, image latency, demands a more collaborative approach because it requires improvements to a variety of systems on the F-35, not only the helmet. Whereas VSI is directly responsible for improving jitter and night vision acuity, it is only partially responsible for enhancing the rate at which the F-35's sensors transfer information to the HMDS, and King stressed that referring to latency as solely a helmet problem is inaccurate.
In the F-35, sensors -- some associated with Northrop Grumman's electro-optical distributed aperture system -- collect imagery and video, which is then transferred through multiple processors until it reaches the helmet. The millisecond-length delays incurred at each step of that chain add up to create an image delay problem, King explained. Through engineering test and evaluation that included some pilot involvement, Lockheed Martin determined that latency of up to 150 milliseconds is acceptable, and the portion of those 150 milliseconds directly attributable to the HMDS is about 40 milliseconds, or less than one third.
Lockheed has supplied VSI with a list of "10 or so" specifications related to different helmet operations for VSI to fulfill its portion of the latency fix process, and King said the company will be able to meet those requirements. He declined to discuss how long it might take for the JSF program to eliminate image latency, though, and deferred comment on that process to Lockheed...."