STK SEET constraints enable you to impose access constraints on a satellite, missile, or launch vehicle based on the effects of the space environment. You can also opt to exclude time intervals that satisfy a given constraint.
If a constraint is not available for accesses from an object, it will be disabled (grayed out) on the Constraints properties page for that object.
For additional background information, consult: SEET: Space Environment and Effects Tool for STK (PDF).
Options for STK SEET Constraints on a Satellite, Missile, or Launch Vehicle
| Constraint | Description |
|---|---|
| Damage Flux |
If this option is checked, access to the object is constrained by Damage Flux being outside the minimum and maximum values. The Damage Flux is the total impact flux from all types of meteoroid particles causing damage (according to the pitting depth threshold specification), determined by summing the damaging impact fluxes of variously modeled particle types. |
| Damage Mass Flux |
If this option is checked, access to the object is constrained by Damage Mass Flux being outside the minimum and maximum values. The Damage Mass Flux is the total impact mass flux from all meteoroid particles causing damage (according to the pitting depth threshold specification), determined by integrating the damaging particle impact flux distribution with respect to mass. |
| SAA Flux Intensity | If this option is checked, access to the object is constrained by SAA Flux Intensity being outside the minimum and maximum values. The SAA Flux Intensity is determined at the vehicle’s location and for specified proton-energy flux threshold channel. |
| Impact Flux |
If this option is checked, access to the object is constrained by Impact Flux being outside the minimum and maximum values. The Impact Flux is the total impact flux from all types of meteoroid particles, determined by summing the impact fluxes of variously modeled particle types. |
| Impact Mass Flux |
If this option is checked, access to the object is constrained by Impact Mass Flux being outside the minimum and maximum values. The Impact Mass Flux is the total impact mass flux from all types of meteoroid particles, determined by integrating the particle impact flux distribution with respect to mass. |
| Temperature |
If this option is checked, access to the object is constrained by the vehicle Temperature being outside the minimum and maximum values. The vehicle temperature is computed assuming thermal equilibrium. |
| Magnetic Field Line Separation |
If this option is checked, access to the object is constrained by the Magnetic Field Line Separation being outside the minimum and maximum values. The Magnetic Field Line Separation is centric angle between the North footprint of the field line containing the vehicle’s location and the North footprint of the field line containing the target’s location. The North footprint is the point of intersection of the field line with the earth’s surface north of the magnetic equator. (If either North footprint is not defined, then the South footprint is used.) When the Magnetic Field Line Separation is small, this condition is known as magnetic conjugacy. |
| Magnetic Dipole L-Shell |
If this option is checked, access to the object is constrained by the Magnetic Dipole L-Shell being outside the minimum and maximum values. The L value is a measure to indicate a particle’s drift shell in a dipole-approximated magnetic field, useful for identifying the field line passing through the vehicle’s location. |