Galileo OS SIS ICD.indd - GSA - Europa

2.1.3. Receiver Reference Bandwidths
The receiver reference bandwidths centred on the carrier frequencies of Table 1 are
specifi ed in Table 2. Those reference bandwidths are considered when computing the
correlation losses provided in paragraph 2.8.
2.2. Signal Polarization
2.3. Modulation
Signal
Receiver Reference
Bandwidth (MHz)
E1 24.552
E6 40.920
E5 51.150
E5a 20.460
E5b 20.460
Table 2. Galileo Signals Receiver Reference Bandwidths
The transmitted signals are Right-Hand Circularly Polarized (RHCP).
In the following sections, modulation expressions are given for the power normalized
complex envelope (i.e. base-band version) sX(t) of a modulated (band-pass) signal
SX(t). Both are described in terms of their in-phase sX-I(t) and quadrature sX-Q(t)
components by the following generic expressions in Eq. 1.
S
s
X
X
� �
�� t � 2 PX
sX
�I
�t�cos�2�fXt��sX�Q�t�sin�2�fXt� �� t � s �� t � j s �� t
X �I
X �Q
Table 3 defi nes the signal parameters used in this chapter, with the indices:
© European Union 2010
Document subject to terms of use and disclaimers p. ii-iii
OD SIS ICD, Issue 1, February 2010
Eq. 1
● ‘X’ accounting for the respective carrier (E5, E5a, E5b, E6 or E1) and
● ‘Y’ accounting for the respective signal component (B, C, I or Q) within the signal
‘X’.
Parameter Explanation Unit
fX Carrier frequency Hz
PX RF-Signal power W
LX-Y Ranging code repetition period chips
TC,X-Y Ranging code chip length s
TS,X Sub-carrier period s
TS,X-Y Subcarrier period s
TD,X-Y Navigation message symbol duration s
RC,X-Y = 1/TC,X-Y code chip rate Hz
RS,X = 1/TS,X sub-carrier frequency Hz
RS,X-Y = 1/TS,X-Y subcarrier frequency Hz
RD,X-Y = 1/TD,X-Y navigation message symbol rate Hz
SX(t) Signal pass-band representation N/A
C X-Y(t) Binary (NRZ modulated) ranging code N/A
D X-Y(t) Binary (NRZ modulated) navigation message signal N/A
3