Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
e<br />
e<br />
e<br />
e<br />
E5a<br />
�I<br />
E5a<br />
�Q<br />
E5b�<br />
I<br />
E5b�Q<br />
( t)<br />
�<br />
( t)<br />
�<br />
( t)<br />
�<br />
( t)<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
�c ��<br />
E5a<br />
�I<br />
, i d E5a<br />
�I<br />
�<br />
L<br />
D C �<br />
, 5 �<br />
5 �<br />
E 5a<br />
I C E a I<br />
E a I<br />
�<br />
��<br />
c<br />
�<br />
��<br />
c<br />
E5a<br />
�Q,<br />
i<br />
LE<br />
5a<br />
�Q<br />
E5b�Q<br />
, i<br />
LE<br />
5b<br />
�Q<br />
rect<br />
, �� i rectT<br />
�tiTC, E5a<br />
�I<br />
�<br />
Tc<br />
, E 5a<br />
�Q<br />
�t�iT� C,<br />
E5a<br />
�Q<br />
�c ��<br />
E5b�<br />
I , i d E5b�<br />
I<br />
�<br />
L<br />
D C �<br />
, 5 �<br />
5 �<br />
E 5b<br />
I C E b I<br />
E b I<br />
rect<br />
, �� i rectT<br />
�tiTC, E5b�<br />
I �<br />
TC<br />
, E 5b<br />
�Q<br />
�t�iT� C,<br />
E5b�Q<br />
© European Union 2010<br />
Document subject to terms of use and disclaimers p. ii-iii<br />
OD <strong>SIS</strong> <strong>ICD</strong>, Issue 1, February 2010<br />
�<br />
��<br />
�<br />
��<br />
�<br />
��<br />
�<br />
��<br />
Eq. 2<br />
The <strong>Galileo</strong> satellites transmit the E5 signal components with the ranging codes chip<br />
rates and symbol rates stated in Table 4.<br />
Signal<br />
(Parameter X)<br />
E5a<br />
E5b<br />
2.3.1.2. Modulation Type<br />
Component<br />
(Parameter Y)<br />
Ranging Code Chip-Rate<br />
RC,X-Y (Mchip/s)<br />
Symbol-Rate<br />
RD,X-Y (symbols/s)<br />
I 10.230 50<br />
Q 10.230<br />
No data (‘pilot<br />
component’)<br />
I 10.230 250<br />
Q 10.230<br />
Table 4. E5 Chip Rates and Symbol Rates<br />
No data (‘pilot<br />
component’)<br />
The wideband E5 signal is generated with the AltBOC modulation of side-band subcarrier<br />
rate R S,E5 = 1/T S,E5=15.345 MHz (15 x 1.023 MHz) according to the expression in<br />
Eq. 3 with the binary signal components e E5a-I, e E5a-Q, e E5b-I and e E5b-Q as defi ned in Eq. 2.<br />
Note that E5a and E5b signals can be processed independently by the user receiver as<br />
though they were two separate QPSK signals with a carrier frequency of 1176.45 MHz<br />
and 1207.14 MHz respectively.<br />
s<br />
E5<br />
1<br />
�� t � �e�� t � j e �� t � s c �� t � j s c �t�T4� 2 2<br />
1<br />
2 2<br />
1<br />
2 2<br />
1<br />
2<br />
2<br />
E5a<br />
�I<br />
� �<br />
�e�� t � j e �� t � s c �� t � j s c �t�T4� E5b<br />
�I<br />
� �<br />
�e�� t � j e �� t � s c �� t � j s c �t�T4� E5a<br />
�I<br />
� �<br />
�e�� t � j e �� t � s c �� t � j s c �t�T4� E5b<br />
�I<br />
E5a<br />
�Q<br />
E5b<br />
�Q<br />
E5a<br />
�Q<br />
E5b<br />
�Q<br />
E5�<br />
S<br />
E5�<br />
S<br />
E5�<br />
P<br />
� �<br />
E5�<br />
P<br />
E5�<br />
S<br />
E5�<br />
S<br />
E5�<br />
P<br />
E5�<br />
P<br />
s,<br />
E5<br />
s,<br />
E5<br />
s,<br />
E5<br />
s,<br />
E5<br />
�<br />
�<br />
�<br />
Eq. 3<br />
The respective dashed signal components ē E5a-I, ē E5a-Q, ē E5b-I and ē E5b-Q represent product<br />
signals according to Eq. 4:<br />
e<br />
e<br />
E5a<br />
�I<br />
E5a<br />
�Q<br />
E5b<br />
�I<br />
E5b<br />
�Q<br />
E5b<br />
�I<br />
E5b<br />
�Q<br />
E5a<br />
�I<br />
E5a<br />
�Q<br />
Eq. 4<br />
E5a<br />
�Q<br />
� e<br />
� e<br />
E5a<br />
�I<br />
e<br />
e<br />
E5b<br />
�I<br />
e<br />
e<br />
E5b<br />
�Q<br />
e<br />
e<br />
E5b<br />
�Q<br />
� e<br />
� e<br />
E5b<br />
�I<br />
e<br />
e<br />
E5a<br />
�I<br />
e<br />
e<br />
E5a<br />
�Q<br />
The parameters sc E5-S and sc E5-P represent the four-valued sub-carrier functions for the<br />
single signals and the product signals respectively:<br />
5
Change language