Nera Saturn Bm Marine Mk2, Technical Manual

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15
Saturn Bm Mk2 Marine – Technical Manual
NCS Common Channel (NCSC)
ADE
shift shift
shift shift
shift
t
BPSK Encoded Signal
(BPSK = Binary Phase Shift Keying)
Forward Direction
MES NCS
S y s t e m D e s c r i p t i o n
S y s t e m D e s c r i p t i o n S y s t e m D e s c r i p t i o n Idle State
MULTI
FRAME
TIMESLOT
7
FRAMING
BITS
32
RATE - 1/2 FEC CODED BITSTREAM
1552 bits
FRAMING
BITS
32
RATE - 1/2 FEC CODED BITSTREAM
1552 bits
Approx. 264 ms
FRAMING
BITS
32
RATE - 1/2 FEC CODED BITSTREAM
1552 bits
8 bits 96 bits
TIMESLOT
6
96 bits
TIMESLOT
5
96 bits
TIMESLOT
4
96 bits
TIMESLOT
3
96 bits
TIMESLOT
2
96 bits
TIMESLOT
1
96 bits
TIMESLOT
0
96 bits
OCTET
No.
1
2
3
4
5
6
7
8
9
10
11
12
8 7 6 5 4 3 2 1
BIT No.
SIGNALLING UNIT – SU
CCITT CRC
(CYCLIC REDUNDENCY CHECK)
MES ID LES ID
SP
ARE
PRIORITY
SP
ARE
CHANNEL
PARAMETERS
MESSAGE
TYPE
Octet No. 1 Octet No. 2 Octet No. 3 Octet No. 4 Octet No. 5 Octet No. 6 Octet No. 7 Octet No. 8 Octet No. 9 Octet No. 10 Octet No. 11 Octet No. 12
SIGNALLING UNIT = 12 "OCTETS" = 96 BITS
EXAMPLE: CALL ANNOUNCEMENT (TYPE 81
H
)
81
H
SER
VICE
NA
TURE
SR
VICE
TYPE
EC
H
DD
H
18
H
09
H
00
H
01
H
01
H
DESTINATION
TERMINAL ID
01
H
SP
ARE
MESSAGE
NUMBER
00
H
54
H
26
H
1 0 0 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 1 1 1 0 1 0 0 0 1 1 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 1 0 0 1 1 0
Message type
MES ID
LES ID
channel parameters
destination terminal ID
CCITT CRC
priority spare spare
service nature service type
spare message number
81
M1
CALL ANNOUNCEMENT
Duplexer
RF Unit
HPA
Combiner/splitter
LNA
Stable Platform
Right Hand Circular
polarized RF signal f = 1530 - 1559 MHz
-- 18 of 30 LRC Prüfung