Comtech EF Data SDM-650B Especificações descarregar pdf (Página 237)

SDM-300L3 Satellite Modem Revision 0

Clocking Options MN/SDM300L3.IOM

6–11

S

A

T

E

L

L

I

T

E

M

O

T

I

O

N

A

N

D

O

R

B

I

T

A

L

I

N

C

L

I

N

A

T

I

O

N

SATELLITE

NOMINAL

POSITION

N

S

GEO-SYNCHRONOUS

EQUATORIAL ORBIT

GEO-SYNCHRONOUS

INCLINED ORBIT

SATELLITE

N/S

MOTION

N

S

A

B

C

A

AS STATION-KEEPING FUEL

BECOMES EXHAUSTED, THE N/S

STATION-KEEPING IS LIMITED

TO PRODUCE A MORE INCLINED

ORBIT, THUS PROLONGING THE

LIFE OF THE SATELLITE.

A SATELLITE IS MAINTAINED AT AN

ASSIGNED GEOSTATIONARY

LOCATION THROUGH THE USE OF

GROUND COMMAND ADJUSTMENTS

TO ITS N/S AND E/W LOCATION. THIS

PROCESS, KNOWN AS SATELLITE

STATION-KEEPING, IS USED TO KEEP

THE SATELLITE DRIFT WITHIN

CERTAIN BOUNDARIES.

THE N/S MOTION CHANGES THE

PATH FROM THE SATELLITE TO THE

EARTH, RESULTING IN FREQUENCY

CHANGES KNOWN AS THE DOPPLER

EFFECT.

FIGURE 6-7. DOPPLER SHIFT

1 2 ... 232 233 234 235 236 237 238 239 240 241 242 ... 433 434

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