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CIVIL AIR PATROL PRESENTS The CAP-STK Aerospace Education Program INTRO TO SPACE COURSE. Presentation for AGI Users Conference. Prince William Composite Squadron Col M. T. McNeely. …using AGI’s Satellite Tool Kit. Why is this important?.

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slide1
CIVIL AIR PATROL PRESENTS

The CAP-STK Aerospace Education Program

INTRO TO SPACECOURSE

Presentation for AGI Users Conference

Prince William Composite Squadron

Col M. T. McNeely

…using AGI’s Satellite Tool Kit

why is this important
Why is this important?
  • Intro to Space will enhance CAP Aerospace Education
  • Program
  • Broaden cadet’s knowledge of Space and Satellite operations
    • Cadet will gain an understanding of a variety of
    • Space fundamentals
        • Orbital Mechanics
        • Types of Orbits
        • Placing a Satellite in Orbit
        • Conducting Satellite Operations
  • Stimulate interest in the ‘Final Frontier’: THE FUTURE!!
orbital mechanics lesson plan 1 part 1
ORBITAL MECHANICSLesson Plan 1 - Part 1
  • Origins
  • Physical Laws
  • Requirements for Injection
  • Classifications of Orbits
  • Coordinate Reference Systems
  • Orbital Elements
physical laws kepler s 2nd law law of equal areas1
T4

T3

T5

T2

A4

A3

T1

A5

A2

A1

T6

A6

PHYSICAL LAWSKepler’s 2nd Law: Law of Equal Areas

The line joining the planet to the center of the sun sweeps out equal areas in equal times

physical laws newton s 2nd law law of momentum
F

F

PHYSICAL LAWSNewton’s 2nd Law: Law of Momentum
  • Change in momentum is proportional to and in the direction of the force applied
  • Momentum equals mass x velocity
  • Change in momentum gives: F = ma
injection requirements speed
INJECTION REQUIREMENTSSpeed

17,500 mi/hr

100 miles

orbital elements keplerian elements
ORBITAL ELEMENTSKeplerian Elements
  • Semi-Major Axis (Size)
  • Eccentricity (Shape)
  • Inclination
  • Right Ascension
  • Argument of Perigee
  • Epoch Time (Location within orbit)
    • True Anomaly

(Orientation)

orbit classifications eccentricity
e = 0.75

e = .45

e = 0

ORBIT CLASSIFICATIONSEccentricity

Eccentricity = c/a

orbital elements keplerian elements inclination
ORBITAL ELEMENTSKeplerian Elements: Inclination

Equatorial Plane

Inclination ( i )

Orbital Plane

orbital elements keplerian elements right ascension
i

Line of Nodes

First Point of Aries ()

Right Ascension of the Ascending Node ()

ORBITAL ELEMENTSKeplerian Elements: Right Ascension
orbital elements keplerian elements argument of perigee
i

Line of Nodes

ORBITAL ELEMENTSKeplerian Elements: Argument of Perigee

Argument of Perigee ()

orbital mechanics lesson plan 1 part 2
ORBITAL MECHANICSLesson Plan 1 - Part 2
  • Ground Tracks
  • Perturbations
  • Launch Considerations
  • Orbital Maneuvers
  • De-orbit/Decay
ground tracks westward regression
Ground TracksWestward Regression

- Earth rotates east under a satellite => satellite

appears to walk west

- Earth rotates 360 degrees in 24 hours

(15 degrees per hour)

ground tracks westward regression1
Ground TracksWestward Regression

C

B

A

-120

-90

-60

-30

0

30

60

A - time zero

B - after one orbit

C - after two orbits

ground tracks inclination
Ground tracks Inclination

60

30

45N

0

30

60

45S

Inclination = 45 degrees

Eccentricity ~ 0

ground tracks eccentricity
Ground TracksEccentricity

Ground Track for Molnyia orbit

eccentricity = .7252

perturbations
PERTURBATIONS
  • Definition
    • A disturbance in the regular motion of a satellite
  • Types
    • Gravitational
    • Atmospheric Drag
    • Third Body Effects
    • Solar Wind/Radiation Effects
    • Electro-magnetic
perturbations gravitational libration
PERTURBATIONSGravitational: Libration
  • Ellipticity of the Earth causes gravity wells and hills
  • Stable points: 75E and 105W

-- Himalayas and Rocky Mountains

  • Unstable points: 165E and 5W

-- Marshall Islands and Portugal

  • Drives the requirement for stationkeeping
perturbations electro magnetic
PERTURBATIONSElectro-Magnetic
  • Interaction between the Earth’s magnetic field and the satellite’s electro-magnetic field results in magnetic drag
launch considerations launch windows
LAUNCH CONSIDERATIONSLaunch Windows
  • The period of time during which a satellite can be launched directly into a specific orbital plane from a specific launch site
  • Window duration driven by safety, fuel requirements, desired injection points, etc.
  • Window is centered around optimal launch time
de orbit decay
DE-ORBIT/DECAY
  • De-Orbit is the controlled re-entry of a satellite to a specific location
    • Used for the recovery of payload
      • Manned missions
  • Decay is uncontrolled re-entry
    • Potential impact anywhere along ground track
    • Re-entry Assessment (by Cheyenne Mountain)
types of orbits lesson plan 2
TYPES OF ORBITSLesson Plan 2
  • Types of Satellites and Missions
  • Satellites vs Orbits
  • Use STK to Evaluate Orbit Type vs Mission Requirement
types of orbits uses of satellites
TYPES OF ORBITS -Uses of Satellites
  • Daily Uses of Satellites
  • Big Picture
  • Affects of Altitude
types of orbits uses of satellites1
TYPES OF ORBITS -Uses of Satellites

GPS Receiver Used in Search and Rescue Missions

types of orbits
TYPES OF ORBITS
  • LEO
  • MEO
  • HEO
  • GEO
placing a satellite in orbit lesson plan 3
PLACING A SATELLITE IN ORBITLesson Plan 3
  • How Satellites are Launched
  • Location Advantages of Two Primary Launch Sites
  • Purpose of a Hohmann Transfer
  • Use STK to Demonstrate Concepts
placing satellites in orbit
PLACING SATELLITES IN ORBIT
  • Booster Types

DELTA II

placing satellites in orbit1
PLACING SATELLITES IN ORBIT
  • Booster Types

ATLAS 2AS

placing satellites in orbit2
PLACING SATELLITES IN ORBIT
  • Booster Types

TITAN IV

placing satellites in orbit3
PLACING SATELLITES IN ORBIT
  • Booster Types

TAURUS

placing satellites in orbit4
PLACING SATELLITES IN ORBIT
  • Booster Types

The

SHUTTLE

BOOSTER

placing satellites in orbit5
PLACING SATELLITES IN ORBIT
  • Booster Types

PEGASUS

placing satellites in orbit6
PLACING SATELLITES IN ORBIT
  • Launch Constraints
conducting satellite operations lesson plan 4
CONDUCTING SATELLITE OPERATIONSLesson Plan 4
  • Basic Elements of a Space System
  • Space System Functions
  • Access
  • STK Demonstrations
exercises lesson plan 5
EXERCISESLesson Plan 5
  • Apply Knowledge Concepts to Problems and Formulate Solutions
  • Demonstrate with STK
intro to space summary
INTRO TO SPACESUMMARY
  • Classroom Presentations

using Powerpoint

  • Demonstrate with STK
  • Let’s Demo !!

The world of Space Operations awaits you!!

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