Principals of Operation
6 -30
Table 6-3 Galileo Signals
6.1.9.C
GPS Receivers
Signal
The strength of the received GPS signal relies on the following parameters:
•
Signal strength of satellite
•
Attenuation in transmitter hardware
•
Gain of transmission antenna (in direction to the receiver)
•
Free space loss due to distance of satellite and receiver
•
Attenuation by the atmosphere (negligible)
•
Deflection and superposition of the direct signal by reflected indirect signals
(multi-path)
•
Gain of receiver antenna
•
Attenuation in receiver hardware
•
Signal tracking technique
Noise
The level of noise seen by a GPS receiver consists mainly of thermal noise but also
background and inter-modulation noise. Most of the single influences are constant or can
be assumed to be constant in the order of measurement accuracy.
Signal
E5 (E5a + E5b)
E1
Centre
Frequency
1191.795 (E5)
1575.42
1176.45 (E5a)
1207.14
(E5b)
Nominal
Bandwidth
51.15 (E5)
24.552
20.46 (E5a)
20.46 (E5b)
Modulation
ALTBOC
INTERPLEX/CBOC
Sub-carrier
a-I
a-Q
b-I
b-Q
A
B
C
Sub-modulation
None
None
None
None
BOC(15,2
.5)
CBOC(6,1
,1)
CBOC(6,1
,1)
Services
F/NA
V
(OS)
Pilot
I/NAV
(OS/CS/SoL
)
Pilot
G/NAV
(PRS)
I/NAV
(OS/CS/S
oL)
Pilot
Code Rate
(Mc/s)
10.2
3
10.2
3
10.23
10.2
3
2.5575
1.023
1.023
Encrypted
No
No
No
No
Yes
No
No
Sequence
Length (primary
x secondary)
1023
0 x
20
1023
0 x
100
10230 x 4
1023
0 x
100
25575 x 1
4092 x 1
4092 x 25
Symbol rate
(sps)
50
N/A
250
N/A
100
250
N/A
Содержание 87339
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