Nera Saturn Bm Marine Mk2, Technical Manual

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21
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 Signalling Mode (CLEARING)
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 Clearing
SU
SUBFRAME - 1
SU
SUBFRAME - 2
SU
SUBFRAME - 3
SU
SUBFRAME - 4
CONTIN.
WAVE
96 bits
BIT
TIMING
64 bits
IN-BAND SIGNALLING FRAME
1920 bits
IN-BAND SIGNALLING 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
SU1
60 ms
* UW
24 bits
FLUSH
8
bits
FLUSH
DUMMY
6 bits
* Unique Word:
0111 1000 1001
for 1st subframe, and
1000 0111 0110
for 2nd, 3rd and 4th
subframe (compliment)
Before FEC
coding
6 bits
SUB-BAND
SIGNALLING
CHANNEL
SU1 SU1
96 BIT
SIGNALLING UNIT
DUMMY
384 bits 8
bits
CCITT CRC
(CYCLIC REDUNDENCY CHECK)
MES TRANSMIT
CHANNEL NUMBER
SPARE
SP
ARE
CODING
ST
ANDARD
CAUSE CLASS CAUSE
LOCA
TION
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
SIGNAL UNITS = 12 "OCTETS" = 96 BIT SIGNALLING UNIT.
EXAMPLE: SCPC "IN-BAND SIGNALLING" MODE (CHANNEL RELEASE)
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
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 transmit
channel number
CCITT CRC
spare
8A
MSB
LSB
LES ID
cause class cause location
spare cause value
coding
std.
M10
CHANNEL RELEASE
9F
H
8A
H
09
H
00
H
11
H
CAUSE
V
ALUE
00
H
21
H
CF
H
3B
H
4C
H
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