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Revision 10 B-10 450-SNUG
Data
Source
Key:
Modulo 2 Adder
BPSK Modulator
Data
Conditioner
(see
Figures B-7,
B-8, and B-9)
FR = Customer Received
Frequency
+
a, b I, c I
b Q
I Channel
Mode 2
Mode 2
Mode 2
Delay
1/2 Chip
+
Mode 1
DG2
DG1
(KuSAR does not support DG1 Mode 3 services)
Modes 1 and 3 Coherent Clock:
Long PN
Code
Generator
S-band:
(240/221)FR Ku-band:
(1600/1469)FR Modes 1 and 3
Delay
1/2 Chip
(note 3)
Short PN
Code
Generator
Mode 1
Noncoherent
Clock:
Spacecraft
Local
Oscillator
90º Phase
Delay
Carrier
Frequency
Generator
Figure B-6. Customer Platform Functional Configuration for DG1 and DG2
I:Q Power Ratio
DG1: 1:1 to 1:4
1/2 Symbol
bQ Delay
Data
DG1 Modes 1 and 2
(note 2)
Conditioner
+
Data (see
Source Figures B-7 c
Q Channel
Q
DG1 Mode 3 and DG2
and B-8)
I:Q Power Ratio
(SMA and SSA only)
Notes
DG2: 1:1 or 4:1 (SMA and
1. a, b, c denote the output of the data conditioner, where:
SSA only)
a = Single data source with data on single data channel (BPSK)
b = Single data source with data on both the I channel (bI) and Q channel (bQ), which can be configured as either:
1) Identical data on I and Q channels (DG1 Modes 1 and 2);
2) Alternate I/Q data bits (DG1 Modes 1 and 2 for SSA and SMA and DG2) with 1:1 I:Q power ratio;
3) Alternate I/Q encoded symbols (DG2) with 1:1 I:Q power ratio
c = Dual data sources with data on both the I channel (cI) and Q channel (cQ). Dual data sources, I/Q power ratio must be = 1:1 for KuSA services.
2. Delay is required for DG1 and DG2 alternate I/Q data bit configuration, DG2 alternate symbol configuration, and DG2 dual data source SQPSK configuration.
3. Q channel PN code sequence is identical to the I channel PN Code sequence, but delayed by X + 1/2 chip, where X is dependent upon the unique customer
PN code assignment.
Mode 2
BPSK
To
TDRS