Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
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2.3.3. E1 Signal<br />
The <strong>Galileo</strong> satellites transmit the E6 signal components with the ranging codes chip<br />
rates and symbol rates stated in Table 7.<br />
Component<br />
(Parameter Y)<br />
Ranging code chip Rate R C,E6-Y<br />
(MChip/s)<br />
8 © 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 />
Symbol Rate<br />
R D,E6-Y (symbols/s)<br />
B 5.115 1000<br />
C 5.115 No data (‘pilot component’)<br />
Table 7. E6 Chip Rates and Symbol Rates<br />
The E6 signal is generated according to Eq. 9, with the binary signal components<br />
eE6-B(t) and eE6-C(t). Note that both pilot and data components are combined on the same<br />
carrier component, with a power sharing of 50 percent.<br />
1<br />
�� t �e�� t � e �� t �<br />
sE 6 � E6�<br />
B E6�C<br />
Figure 7 provides a generic view of the E1 CBOC signal generation.<br />
2<br />
Figure 7. Modulation Scheme for the E1 CBOC Signal<br />
The E1 CBOC signal components are generated as follows:<br />
Eq. 9<br />
● e E1-B from the I/NAV navigation data stream D E1-B and the ranging code C E1-B, then<br />
modulated with the sub-carriers sc E1-B,a and sc E1-B,b<br />
● e E1-C (pilot component) from the ranging code C E1-C including its secondary code,<br />
then modulated with the sub-carriers sc E1-C,a and sc E1-C,b<br />
Equation 10 provides the mathematical description of these components.<br />
e<br />
e<br />
E1�<br />
B<br />
E1<br />
�C<br />
( t)<br />
( t)<br />
�<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
� �<br />
�<br />
i��<br />
�<br />
�c ��<br />
E1<br />
�B,<br />
i DE1�<br />
B<br />
�<br />
L<br />
D C �<br />
, E1<br />
�B<br />
1�<br />
E1<br />
B<br />
c<br />
L B<br />
�c ��<br />
E1<br />
�C,<br />
i rectT<br />
�<br />
L<br />
c,<br />
E1�<br />
C<br />
L1�C<br />
, �� i rectT<br />
�tiTc, E1<br />
�B<br />
�<br />
�tiT� c,<br />
E1�C<br />
�<br />
��<br />
�<br />
��<br />
Eq.10<br />
<strong>Galileo</strong> satellites transmit ranging signals for the E1 signal with the chip rates and subcarrier<br />
rates defi ned in the following Table 8.
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