NVS Flashcards
what are the 2 types of night vision devices available to crew members?
image intensifiers(I2), thermal imaging (FLIR)
what is the purpose of thermal imaging systems?
to provide an IR image of a scene by detecting heat
what is the advantage of thermal imagers over image intensifiers?
no light needed to operate the thermal imager
what atmospheric element affect the composition or density of the atmosphere and, therefore, affect IR signal transmission?
moisture, fog, dust, haze, smoke
what two factors create most of the parallax effect?
angular difference between the PNVS and the HDU, and the distance from the item being observed
what light spectrum does the image intensifier see?
What light spectrum does the thermal imaging system see?
visible and near IR
Far IR
What is IR crossover?
Phenomenon that occurs twice a day where the temp conditions cause a loss of contrast between adjacent objects
What is atmospheric condition?
When FLIR exceeds eye capability, “see” through obscurations
What is atmospheric transmission?
IR signal is affected by obscurations that affect air density (ie overcast, rain) causing poor quality FLIR image
What function does the M-PTUR receiver perform?
Converts infrared images to 16 analog outputs to the FLIR processor
What is the function of the M-PECA?
Amplifies azimuth and elevation commands and sends them to the drive motor to move the turret
What are the three types of BITs?
SBIT, CBIT, INIT (start up, continuous, initiated)
What is the function of the M-PAZD
Moves the turret to the commanded LOS
How many detector array output lines of video?
960 lines, video processor can only display 811, so there are 149 in reserve
What material is the mptur window/lens made of?
Geranium crystal
What conditions does the anti-ice turn on?
41 degrees F or 5 C, moisture in the air
Purpose of the video processor?
Collects video from FLIR, converts it to analog, and sends it to the correct source
The SBIT for PNVS & TADS starts when?
60sec after power on, takes 30 sec
What causes frozen video?
loss of video link communucations
What does loss of bus communications results in?
Affected turret will move to fixed forward in 5 sec
What causes cloud shifting?
Dynamic range compression and IR detector non-uniformity
How is the PNVS turned on?
WPN UTIL page automatically if APU power up, or manually if AGOU power up
What is FLIR polarity?
A shade reversal effect applied to the FLIR in order to view an item more clearly
White hot, black hot
How can a crew member tell what polarity their FLIR system is using?
Look at the sky, dark-white hot, light-black hot
How can the crewmember using the PNVS bring it out from the stowed position?
Placing the NVS select switch into NORM or FIXED position
What are the 4 considerations for FLIR optimization?
FLIR must be cooled
Scene finch in detail
Select polarity
Only one control should be adjusted at a time
Which should be optimized first? FLIR or the IHADDSS?
IHADSS
What is the definition of FLIR optimization?
Using a combination of level and gain to achieve the best detail
What is the primary objective of FLIR adjustment?
Obtaining the highest possible picture quality for the flight environment
What two things should crew members ensure before they optimize the FLIR?
Ensure that the NVS not cool, or, FLIR Not cool messages are no longer present, and ACM is off
When is an optimization required?
When the crew is going to use the FLIR for flight, laser ops, and weapons
What establishes the FOV of the M-PNVS?
Afocal assembly
How can the crewmember in control of the PNVS stow it?
Place NVS mode switch off
What symbology is always present on the PNVS display?
Flight
What does the NORM position provide the pilot?
Provides the PNVS video that is slaved to the pilots helmet mounted display
What does the fixed position provide the pilot?
Provides the pilot with a PNVS that is fixed forward 0 degrees in azimuth and -4.9 degrees in elevation
The TADS is divided into what two major sections?
MDSA
MNSA
What major components are located within each section of the TADS?
MDSA-DTV,LST,LRFD
MNSA-FLIR
What must crews ensure on preflight for TADS operation?
Covers OFF - MDSA cover, MNSA cover, boresight module cover
Why is the TADS resolution not as good as the PNVS?
TADS is not designed for flight, it is designed for targeting
2.3 vs 1.5
When is the TADS not an available selection as a sensor?
When the NVS mode switch is OFF
If the CPG is using the TADS as a sight and it is required for NVS flight, what must the CPG do to gain control of the TADS as a sensor?
Place the NVS mode switch to norm or fixed
If either crewmember selects TADS from a sight to a sensor, what image will be displayed on the HDU?
FLIR, Wide FOV
What symbology will be displayed on the HDU when using TADS as a sensor?
Flight symbology
What is the fixed field of view of the TADS when used as a sensor?
30 x 40
What is the slew rate of the TADS?
60 degrees per second
What are the two stow positions for the TADS when not in use?
TADS stow 180
TADS alternate stow 0 azimuth, 0 elevation
Which crew member can stow TADS?
CPG
How can a crewmember select the opposite sensor?
NVS mode switch other than OFF, NVS select switch to selected sensor
Can the pilot always select TADS from the COG?
Yes
Can the CPG select PNVS from the pilot?
Yea
If both crew members are using a sensor, what happens if either crew member selects NVS select switch on the collective flight grip?
Sensor swap
