Optical Properties

The OpticalProperties attribute applies to a satellite based tracking instrument or facility object. In the case of a satellite based tracking instrument, the optical properties are applied to space based tracking where one satellite produces measurements of another satellite.

Polar Exclusion

Enter an angle value for the PolarExclusion attribute. Optical measurements, right ascension and declination, will be considered to be invalid if they are within the exclusion angle of either the north or south inertial poles. Such measurements will not be generated by the simulator, nor will they be processed by the filter.

Reference Frame

Use the ReferenceFrame attribute to specify the reference frame in which the right ascension and declination angles will be reported. This reference frame is used in the creation of simulated data and in the processing of data if the tracking data file does not explicitly specify the reference frame for the observations.

Reference Frames
Frame Description
ICRF International Celestial Reference Frame.
MEME B1950 The mean equator and mean equinox of B1950 reference frame, based on FK4.
MEME J2000 The mean equator and mean equinox of J2000 reference frame, based on FK5.
MEME Of Date (mean of date) Defined by the mean equator and mean equinox of the observation epoch, based on FK5.
MEME Of Jan 0 Defined by the mean equator and mean equinox of January 0 of the year of the observation, based on FK5.
MEME Of UTC 00:00 Defined by the mean equator and mean equinox at zero hours on the UTC day of the observation epoch, based on FK5.
TEME Of Date Defined by the true equator and mean equinox of the observation epoch, based on FK5.
TEME Of Jan0 Defined by the true equator and mean equinox of January 0 of the year of the observation, based on FK5.
TEME Of UTC 00:00 Defined by the true equator and mean equinox at zero hours on the UTC day of the observation epoch, based on FK5.
TETE Of Date (true of date) Defined by the true equator and true equinox of the observation epoch, based on FK5.
TETE Of Jan0 Defined by the true equator and true equinox of January 0 of the year of the observation, based on FK5.
TETE Of UTC 00:00 Defined by the true equator and true equinox at zero hours on the UTC day of the observation epoch, based on FK5.

Aberration Corrections

Use the AberrationCorrections attribute to enter corrections to be applied in the processing of optical measurements. Aberration corrections are also applied to Azimuth and Elevation measurements when the LightTimeDelay setting on the corresponding measurement statistics entry is set to true.

Aberration Correction Options
Option Description
All Specifies that observations should be corrected for annual and diurnal aberration.
Annual Specifies that observations should be corrected for annual aberration assuming that diurnal aberration has been removed.
Diurnal Specifies that observations should be corrected for diurnal aberration assuming that annual aberration has been removed.
None Specifies that observations have been previously corrected for all aberration effects.

NOTE: These settings may also be interpreted as the aberration effects to be added to measurements during simulation.

ODTK 6.5