STK EOIREOIR models detection, tracking, and imaging
performance of electro-optical and infrared sensors.

EOIR provides the following benefits:• Radiometric sensor model that
goes beyond simple geometry.
EOIR considers the physics-based
interactions of sensor, target, andenvironment providing accuracy
and fidelity that have beenanchored against operational sensor
measurements.
• Faster and more accessible thancomplex stand-alone sensor models.
The low complexity of the model
speeds analysis and provides usability
for both general systems engineers
and sensor designers.
• Comprehensive mission analysis. STK’s
broad mission modeling environment
considers EOIR performance inconjunction with sensor platform
dynamics, communications, and othermission architecture elements toassess integrated performance acrossa variety of mission scenarios.

EOIR sensors
EOIR supports up to 36 bands persensor. Bands share a common locationand line of sight, but otherwise canhave different parameters. Bands canbe used to simulate a multiband sensor
or different settings of a zoom lens.
Spatial, spectral, optical, and radiometricproperties can be defined on a perband basis, including:• Angular field of view extents• Focal plane height and width in pixels• Number of detection bands• Lower and upper band edges• Band integration time, sensitivity (NEI,NER) and dynamic range (SEI, SER)
• Effective focal length• Entrance pupil diameter• Diffraction wavelength• Longitudinal defocus• Image quality (zero, negligible, mild
or moderate aberrations)• Line of sight jitter

Sensor performance
Report radiometric performance forpoint sources and extended objects
through STK reports, graphs anddynamic displays. Metrics include
target radiance/irradiance, backgroundradiance/irradiance, scene photon
signal-to-noise ratio (SNR), noise
equivalent irradiance (NEI) and noise
equivalent radiance (NER).

Synthetic sensor scene
The scene represents the analog world
by digitally sampling the “modeleduniverse” at four times the sensor’s
detectors spatial frequency (16 spatialsamples per sensor pixel) and over the
passband at the wavelengths defined by
the sensor model.
The scene models 27 optical materials,
central bodies, stars, satellites, aircraft,
missiles, and thermal models of planets,stars, solar radiance, and missile plumes.

Multi-sensor architecture
analysis
Model mission architectures with up to
six independently specified and steered
sensors distributed across satellite,
aircraft, or ground platforms.

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STK EOIR
Atmosphere models
Simple atmosphere model.
Calculates transmission, scatter in,and path radiance at the wavelengths
corresponding to the Spectral Band
Edges, and at a spectral resolution
specified by the user-defined number ofintervals.
MODTRAN-based atmospheric model.
One of the highest fidelity, community
standard atmospheric models available
for EOIR simulation. This model
approximates MODTRAN results forthe same surface conditions that aremodeled by the Simple atmospheremodel.

Target modeling
Model optical and thermal propertiesof aircraft, satellites, and missiles byspecifying shape, dimensions, surface
material, and surface temperature.
Missile targets can be multi-staged
with independent stage properties
and a solid black body plumemodel (temperature and emissivity).
Furthermore, custom 3D geometry
and spectral materials can be loaded
to simulate various other target types
applicable for your EOIR mission, andhundreds of low polygon count 3Dmodels are included.
SURFACE MATERIALS• Aluminum MLI• Black thermal control paint• Burnished aluminum• Gold MLI• Gray body
• Silver MLI• Solar panel• White thermal control paint• Load your own custom materialreflectance or emissivity spectra
EARTH SURFACE MATERIALEOIR has a low to moderate spatial
resolution global spectral material
map of the earth broken into the 17
International Geosphere Biosphere

Program (IGBP) Global Land Covertypes plus Tundra. You can also overridea portion or all of the map with your own
custom reflectance texture map witharbitrary spatial resolution.

Accurate star field
Leverage STK’s database of over two
million high quality star records fromthe Hipparcos and Tycho II catalogs tomodel precise position and spectral
irradiance based on apparent motion,temperature, and magnitude.

Celestial bodies
Include thermal and optical propertiesof the Earth, Moon, Sun and planets.
Thermal models include diurnal,latitudinal, and seasonal variations.
Optical surface properties maps areincluded for the Earth, Moon andMars at 0.93 km, 2.5 km, and 0.47 km
resolutions, respectively. The Earth
includes an atmospheric model withfour aerosol settings.

Use custom models,materials, target signatures,and thermal profiles

with the freely available NASA
maintained ASTER USGS material withover 2,400 spectral samples.
• Point Source Target Signature. Loadyour own custom Target Signature File(.tsf) that defines the EOIR propertiesof the target signature that can varywith time, angle, and wavelength.
• Custom Thermal Profiles. Createtime-temperature thermal profiles
with external tools, manually, or withthermal calculation tools such as STKSEET’s passive thermal model to havetargets exhibit time-dynamic surface
temperatures.

EOIR sensor constraints
EOIR constraints set a signal-to-noise
ratio (SNR) on an EOIR sensor.

Export sensor images
Export sensor output images as bitmaps
for video creation or ASCII raw data files
for use in external image processing
algorithms or sensor modeling tools in
MATLAB, MathCAD, etc.

• Custom 3D Models. Load custom,lowpoly (around 1,000 polygon count)
3D models as EOIR targets.
• Custom Materials. Load custom
materials for EOIR targets. Compatible
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