AE 323 Quiz 2

Passive tracking

1 way sensing of objects through electrometric means (RF, Radars) (Optic, telescopes)

Advantages of Constellation Satellite

Better coverage, Smaller Size, Greater reliability.

Space-referenced Orbit

An Operational Orbit whose characteristic is somewhere in space,

transfer orbit

An orbit used to maneuver a satellite from LEO to GEO, Earth and Moon

Photometric Characterization

Characterizes Objects by how they Look

Astrometric Characterization

Characterizes Objects by how they Move

Challenges of space craft Launch

High vibrations and Noise, High Acceleration, Mechanical Shocks, Thermal Environment, Rapid loss in pressure.

Cromosphere

Few thousand Kilometers above Photosphere of sun responsible for ultraviolet emissions.

LEO

Low Earth Orbit Satellites and Space Debris

MEO

Medium Earth Orbit Global Positioning Systems(GPS)

Space Situational Awareness

Practice of identifying objects in space either globally or within a locally defined area and determining the nature of the object based of a criteria.

Basic Data to Budget

Initial conditions of Launch vehicle, Mission orbit, Mission Duration, Orbit maintenance, Drag parameters, Orbit Requirements, Final conditions.

Corona layer

Upper atmosphere of sun extends several solar radii and emits X-Rays

General SSA Process

Source-Sense-Process-Initial estimation-Precise estimate

space debris

the various types of man-made space junk that are in orbit around Earth (Inactive Satellites, Rocket Bodies, Debris.

Advantages of single satellite

Less resources, single power system, single launch orbit.

Active tracking

2 way communication between satellite and its operator.

solar wind

Flow of Plasma expelled at high velocity's from sun and is formed at outermost layer of sun.

Optic SSA Process

Nature-Camera-Observe and Image process-Tracklet Association-Angle-only OD

GEO

Geostationary Earth Orbit Telecommunication Satellites.

GTO

Geostationary Transit Orbit Rocket Bodies

Kessler Syndrome

More debris create more debris

Earth Reference Orbit

Operational Orbit provides coverage of the earth or near earth space.

parking orbit

a temporary orbit where the spacecraft stays until transferring to its final mission orbit