Nera Saturn Bm Marine Mk2, Technical Manual

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19
Saturn Bm Mk2 Marine – Technical Manual
ADE
Duplexer
RF Unit
HPA
Combiner/splitter
LNA
Right Hand Circular
polarized RF signal f = 1626.5 -1646.5 MHz
Stable Platform
OQPSK Encoded Signal
(OQPSK = Offset Quadrature Phase Shift Keying)
0
°
+90
°
+270
°
+180
°
0
°
+90
°
+270
°
+180
°
t
SCPC channel (Single Carrier Per Channel)
In-band
Return Direction
MES LES
VOICE
SUBFRAME - 1
VOICE
SUBFRAME - 2
VOICE
SUBFRAME - 3
VOICE
SUBFRAME - 4
CONTIN.
WAVE
96 bits
BIT
TIMING
64 bits
VOICE FRAME
1920 bits
VOICE FRAME
1920 bits
END OF
DATA
192 bits
n x 240 ms 240 ms 240 ms 24 ms
60 ms 60 ms 60 ms 60 ms
CW
24 bits
SUB
32 bits
VOICE FIELD
384 bits
60 ms
* UW
24 bits
FLUSH
8 bits
DUMMY
8 bits
DUMMY DUMMY
8 bits
* Unique Word:
0111 1000 1001
for 1st voice frame, and
1000 0111 0110
for 2nd, 3rd and 4th
subframe (compliment)
Digital input from
voice encoder
Scrambled
6 bits
SUB
24 bits
VOICE FIELD
384 bits
MES_SIG
SIGNALLING
CHANNEL
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
Message type
MES ID
MES receive
channel number
CCITT CRC
scrambling vector
8A
MSB
LSB
LES ID
spare
spare
CCITT CRC
(CYCLIC REDUNDENCY CHECK)
SCRAMBLING VECTOR LES ID MES ID MESSAGE
TYPE
Octet No. 12 Octet No. 11 Octet No. 10 Octet No. 9 Octet No. 8 Octet No. 7 Octet No. 6 Octet No. 5 Octet No. 4 Octet No. 3 Octet No. 2 Octet No. 1
SIGNALLING UNITS = 12 "OCTETS" = 96 BITS = 24 BITS FROM EACH OF THE 4 VOICE FRAMES
EXAMPLE: MES CONNECT
SPARE MES RECEIVE
CHANNEL NUMBER
A7
H
85
H
4E
H
77
H
21
H
4C
H
00
H
09
H
8A
H
D8
H
9F
H
99
H
SP
ARE
1 0 1 0 0 1 1 1 1 0 0 0 0 1 0 1 0 1 0 0 1 1 1 0 0 1 1 1 0 1 1 1 0 0 0 1 1 1 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 1 0 1 0 1 1 0 1 1 0 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 0 0 1
M25
MES CONNECT
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 Voice
-- 22 of 30 LRC Prüfung