OEM 3 Flashcards
What is the act of manuevering a satellite into and within the relative vicinity of another?
Rendezvous & Proximity Operations (RPO)
What is the satellite around which an RPO occurs?
Resident Space Object (RSO)
A satellite that does not actively assist nor hinder RPO is called?
Non-cooperative
A satellite that actively hinders RPO is called?
Uncooperative
What is the spatial area (direction and distance) where a satellite payload may function?
Payload Engagement Zone (PEZ)
What is the spatial area (direction and distance) where a satellite weapon may function?
Weapon Engagement Zone (WEZ)
Which direction does relative motion in the RIC frame trend?
Clockwise
What is the origin, fundamental plane, and principle direction of the RIC frame?
Origin: Satellite
FP: Orbital
PD: Radial Vector
A difference in which COE causes permanent in-track drift?
Semi-major axis
What is directly related to the difference in semi-major axis?
Drift Rate
What does a difference in eccentricity produce?
A 2x1 in-plane ellipse
2x1 in-plane ellipse size is directly related to?
The difference in eccentricity
What is the period of the 2x1 ellipse?
The same as the RSO’s orbit
A difference in which COEs will produce motion along a drifting 2x1 in-plane ellipse?
Semi-major axis & eccentricity
What is directly related to the difference in eccentricity?
Radial motion
A difference in which COEs will produce oscillating cross-track motion?
Inclination & RAAN (out-of-plane)
A difference in which COEs will produce helical motion?
Semi-major axis, eccentricity, & inclination
Which burns change eccentricity?
Radial
Which burns change eccentricity and semi-major axis?
In-track
Which burns change inclination and/or RAAN?
Cross-track
What is the path a satellite would take without maneuvering?
Free-flight trajectory
What significantly impacts free-flight trajectories?
Time of Flight between two waypoints
What are the 3 main considerations in developing prox ops TTPs?
Safety
Time
Efficiency
What occurs when all COEs match except true anomaly?
Perch (co-orbital)
What occurs when two satellites are on circular orbits with different semi-major axes?
Linear drift
What occurs when two satellites have the same semi-major axis but different eccentricities?
Natural Motion Circumnavigation (NMC)
The period around the NMC is the same as what?
Period of the RSO
The NMC 2x1 ellipse is twice the width in the _____ direction as the height in the _____ direction.
In-track, radial
What is half of an NMC (returns to the start if the next maneuver is missed)?
V-Bar Hop
What allows the chaser to remain above or below an RSO for extended periods of time by creating consecutive waypoints?
Dynamic Station Keeping (DSK)
What is half of a DSK (chaser ingresses along the radial axis and drifts away if the next maneuver is missed)?
R-Bar Hop
What is placing waypoints around the RSO to produce a constant-range trajectory?
Forced Motion Circumnavigation (FMC)
What 2 effects result from adding more waypoints to an FMC?
- Use more fuel
- Path is closer to a circle
Which direction does a positive RIC burn trend?
Up and to the right
Which direction does a negative RIC burn trend?
Down and to the left
