Adv land IR detection 2 Flashcards
Absorption Vs Scattering
Absorption is significant for EO
Very significant for IR
Scattering is very significant for EO
Significant for IR
The 5 environmental factors and how they effect EO and IR
Sun
EO - camera can be blinded
IR - can be degraded by the sun and causes thermal scaring
Cloud
EO - thick cloud obscures picture, wispy cloud degrades, also causes shadowing
IR - same as EO
Precipitation
EO - causes light scatter
IR - thermal significant objects stand out, causes attenuation
Fog
EO - unable to see through thick fog
IR - same as EO but hot spots such as fires may be visible
Visibility
EO - sand/dust particles cause light scatter
IR - causes Scattering reducing ability to see through
Four factors that determine an objects thermal response
Absorptivity
Thermal capacity
Thermal conductivity
Surface area to mass ratio
What is the minimum resolvable temp (MRT)?
The temp at which all facets of the target are visible. The entire target is taken into consideration
What is the min detectable temp (MDT)?
Temp of the hottest/coldest resolved before the entire target
How can an ATO be changed after initial publish?
A whole new ATO
Or via Air task message (ATM)
The two types of airspace control?
Positive control - relies on radar returns, IFF, Data links, they track and direct
Procedural - previously agreed to and disseminated airspace orders
3 common elements used to maintain separation?
Position/lateral
Position/vertical
Time
Airspace control means
ROZ
WEZ - Weapons engagement zone (MEZ and FEZ(fighter))
BDZ - Base defence zone
The IFF switch OFF line
The IFF switch ON line
What is system saturation?
Effectively blooming for IR
Emissivity perfect blackbody
High emissivity and zero reflection
What advantages of SWIR?
Can see though glass, haze and smoke
