World Broadcasting Unions Digital Radio User Manual - page 71
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DIGITAL RADIO GUIDE
SATELLITE TRANSMISSION - SIRIUS / XM
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Figure 5.3. Sirius SDARS Delivery System
Sirius SDARS Delivery System
The Sirius constellation consists of three satellites in inclined, elliptical geosynchronous
orbits whose planes are 120° apart, as shown following. The satellite orbital elements
are given in the accompanying table, and the satellites’ ground tracks are also shown.
The orbital configuration was designed so that each satellite spends 16 hours north of the
equator, during which time it is used for transmission, and 8 hours south of the equator
when it is inactive.