OEM FINAL

Question 1

_______orbits are the most commonly used orbital regime.

Answer 1

LEO

Question 2

Leo has a period of _______ to ______minutes and a altitude of _______kms or less.

Answer 2

90-120 minutes
2,000kms

Question 3

MEO has a period of greater than _______120 minutes and less than _____hours.

Answer 3

120 minutes
24 hours

Question 4

MEO supports the missions of ______,_______, and ___________.

Answer 4

PNT,SATCOM and Persistent Earth Observation.

Question 5

_________ is a MEO orbit with a period of about 12 hours.

Answer 5

Semi-Synchronous Orbit

Question 6

_______orbits have a period of about 24 hours and an altitude of __________kms.

Answer 6

GEO
35786kns

Question 7

Three satellites in GEO can give ________coverage with the exception of the polar regions.

Answer 7

global

Question 8

_________is a GEO orbit where inclination and eccentricity both equal 0.

Answer 8

Geo Stationary Orbit

Question 9

_________ is a special, near-polar inclination, LEO orbit with a retrograde motion.

Answer 9

Sun-Synchronous orbit (SSO)

Question 10

HEO orbits allow max coverage at higher latitudes, covering the gap left by _______orbits.

Answer 10

GEO

Question 11

________orbits primarily support the missions of SATCOM and missel warning.

Answer 11

HEO

Question 12

Field of ________is the portion of Earths surface that is geometrically visible from the satellites position in space.

Answer 12

regard

Question 13

Field of ______ is the instantaneous coverage area capable of being seen by the payload.

Answer 13

view

Question 14

The length of time at satellite has line of sight to a point on the Earth is called _________.

Answer 14

Dwell Time

Question 15

The _______refrence frme is used to describe orbits, define classical orbital elements and is considered “non-rotating”

Answer 15

ECI

Question 16

The ECEF reference frame is used to describe ground tracks, the path a satellite travels relative to the earth’s surface and is considered “___________” with earth.

Answer 16

rotating

Question 17

The _________ reference frame is best used to describe motion from an individual satellite’s perspective.

Answer 17

RIC
Radial intrack cross track

Question 18

we use _______angles to determine when to do a launch, in order to launch at a specific RAAN.

Answer 18

Sidereal

Question 19

_________describes the size of an orbit.

Answer 19

Semi-major axis

Question 20

The greater the energy of an orbit, the larger the _________.

Answer 20

size

Question 21

Eccentricity describes the _______of an orbit.

Answer 21

shape

Question 22

E=0

Answer 22

circle

Question 23

0<e<1

Answer 23

elipse

Question 24

e=1

Answer 24

parabola

Question 25

e>1

Answer 25

hyperbola

Question 26

Inclination describes the _______ of the orbit.

Answer 26

tilt

Question 27

The inclination of a satillite orbiting earth is mesured off of the _______plane.

Answer 27

equitorial plane

Question 28

i=0 degrees 180 degrees

Answer 28

equitorial

Question 29

i=90 degrees

Answer 29

Polar

Question 30

0 degrees < i < 90 degrees

Answer 30

Prograde

Question 31

90 degrees < i < 180 degrees

Answer 31

retrograde

Question 32

____________describes the TWIST in the orbit.

Answer 32

RAAN Right accension of the accending node

Question 33

RAAN is measured from _______ to _________.

Answer 33

vernal equinox, ascending node

Question 34

__________ describes the ORIENTATION of an orbit with the orbital plane.

Answer 34

argument of perigee

Question 35

Argument of perigee is measured from _________to _________.

Answer 35

ascending node, perigee

Question 36

True anomaly describes the _______ of a satellite within the orbit.

Answer 36

location

Question 37

________ is measured from perigee to the satellite location.

Answer 37

true anomaly

Question 38

how long is the period of a satellite in LEO?

Answer 38

90-120 minutes

Question 39

what statement is true about GEO orbits? a.) Geo-stationary i=0 e=0 b.) Geo-synchronous i=0 e=0

Answer 39

a

Question 40

The same sun angle or shadow every orbit is a characteristics of what orbit?

Answer 40

(SSO) Sun-synchronous orbit

Question 41

What orbit creates long dwell times, normally over the northern latitudes for mission requirements? a.) LEO b.)MEO c.)HEO d.)GEO

Answer 41

c

Question 43

What operational consideration describes the portion of earths surface that is geometrically visible from the satellite's position in space? a.) field of regard b.) field of view c.)dwell time

Answer 43

a

Question 44

What operational consideration describes the instantaneous coverage area capable of being seen by the payload? a.) field of regard b.)field of view c.) dwell time

Answer 44

b