NVS Video Characteristics

Question 1

Frozen Video

Answer 1

Loss of video link communication & results in a VIDEO FROZEN message in the status section of symbology. Video will freeze if missing frames are 10. Video will be removed if count not restored in 4 sec. Cycle NVS mode to OFF and back. If not restored follow PNVS failure CL.

Question 2

Degraded Video

Answer 2

Due to code word error, missing column count, or cyclic redundancy check in TADS/PNVS. Result is all or portion of video image degraded & Video Degr message. If degradation is not night-flight safe, execute PNVS failure procedure.

Question 3

Loss of BUS communication

Answer 3

The affected turret will move fixed forward within 5 seconds. If DTV is selected, FLIR wide FOV will be selected.

Question 4

Dead Channel

Answer 4

This results in a failed detector and is evident by a horizontal line in the video

Question 5

Flashing Channels

Answer 5

This is caused by intermittent detectors and appears as horizontal broken or line segments. The broken line segments may alternate between black and white and may also flash.

Question 6

Cloud Shifting

Answer 6

This appears as a lighter cloud in the horizon as a result of dynamic range compression and IR detector non-uniformity. The non-uniform horizontal lines appear as a cloud which may move up and down through the lighter regions in the horizon caused by DRC algorithm

Question 7

Dynamic Range compression (DRC) Effect

Answer 7

When viewing vertical scene contents (like a runway), the near and far areas of the object will appear in varying shades. This shading will not remain fixed; instead, it will move vertically and may appear as a light fog in the scene.

Question 8

Halo Effect

Answer 8

Occurs from image enhancements in low contrast scenes (ex. flying formation, aircraft above horizon will appear to have bright borders)

Question 9

NOE Coupling

Answer 9

FLIR effect from terrain flight. Viewing features above sensor will see those objects change “color”.

Question 10

NVD (NVG) considerations

Answer 10

Use degrades distance estimation and depth perception (compared to FLIR). A/C in flight may appear closer due to Nav lights. Weapon flash may impair or shutdown NVG

Question 11

NVG Training restrictions

Answer 11

Both Crew must be current.
PNVS/TADS are still primary and must remain functional.
Crew Members may only use NVD (NVG) one at a time.