14.3 Satellite Radio Navigation Systems
257
Table 14.5 Technical characteristics of GPS NSVs
Characteristics
NSV Block IIA NSV Block
IIB
NSV Block
IIB-M
NSV Block
IIF
NSV Block
III
Contractor
Rockwell
International
Lockheed
Martin
Lockheed
Martin
Boeing
Lockheed
Martin
Active state
period, year
7.5
10
10
12
15
Weight, kg
985
11,267
11,267
14,651
2161
Signals
L1 C/A
L1/2 P(Y)
L1 C/A
L1/2 P(Y)
L1 C/A
L1/2 P(Y)
L2C
L1/2 M-Code
L1 C/A
L1/2 P(Y)
L5I
L1M
L2M
L2C
L1 C/A
L1/2 P(Y)
L1C
L2C
L2M
L5
L1/2
M-Code
Table 14.6 Characteristics of GPS navigation radio signals
Band Carrier
frequency,
MHz
Signal Duration of
PRS code,
symbols
Clock
frequency,
MHz
Modulation type
Transfer
rate, bit/s
L1
157,542
C/A
1023
1,023
BPSK
50/50
P
~7 days
1023
BPSK
50/50
M
–
5115
BOC(10,5)
–
L1Co
10,230
1023
BOC(1,1)
100/50
L1Cp
10,230·1800 1,0231,023 TMBOC(6,1/11) –
L2
12,276
P
~7 days
1023
BPSK
50/50
L2C
M:10,230
L:767,250
1023
BPSK
50/25
M
–
5115
BOC(10,5)
–
L5
117,645
L5I
10,230·10
10,230·20
10,023
10,023
BPSK
BPSK
100/50
L5Q
• backup control center for the GPS;
• monitoring stations of the National Geospatial Intelligence Agency;
• global network of upload and measuring stations;
• US Air Force GPS monitoring stations;
• L-band GPS interrogation stations.
The ground-based GPS control complex implements a request-free technology of
ephemeris-time support. The global network of command and measurement stations
permits to upload information on board with 4–6 h interval.
Global satellite navigation system GALILEO.