The NASA Global Differential GPS System (GDGPS) and The ...
The NASA Global Differential GPS System (GDGPS) and The ...
The NASA Global Differential GPS System (GDGPS) and The ...
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• New TDRSS global beam designed<br />
TASS Configuration<br />
– Element phasing controlled via upload comm<strong>and</strong>s<br />
– Fixed beam ~ ± 9 - 10 o ; covers altitudes to ~ 1000 km<br />
• 24 x 7 S-b<strong>and</strong> broadcast from three TDRS will provide global coverage<br />
• Multiple Access broadcast<br />
– 2.5 MChips/sec PN code modulated / BPSK data stream<br />
– Unique PN code per TDRS synchronized with <strong>GPS</strong><br />
– 512 bps data rate including rate 1/2 FEC<br />
• Next Generation TDRS will be more capable<br />
– Wider beam for better polar coverage<br />
– Stronger signal<br />
<strong>NASA</strong>’s <strong>Global</strong> <strong>Differential</strong> <strong>GPS</strong> <strong>System</strong><br />
171 o W<br />
~18-20 o<br />
85 o E<br />
<strong>NASA</strong><br />
47 o W<br />
Y. Bar-Sever - 17
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