1. GEO Bird
SV
Communication Subsystem Slides for Boeing
April 16, 2013
Comms Slides Boeing
2. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Outline
1 GEO Bird Software
Main Dish 2 SV
Permanent Payload TT&C
TT&C C&DH
C&DH Software
Comms Slides Boeing
3. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Requirements/Trades
Description Specifications Source
Transmit Frequency K-Band(19.500 GHz) RFP/Derived
Date Rate <1.7 GB/s RPF/Derived
Ground Antenna 3m in Colorado RFP
Margin 3 dB Derived
Gimbal 2-D Derived
0.5 m 1.0 m 3.0 m
Gain (dB) 40 46.43 55.97
Power (W) 1159.87 292.47 35.61
Beamwidth
1.56 0.78 0.26
(degrees)
Comms Slides Boeing
4. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Trades Cont.
Gain (typical) HPBW
Antenna (typical)
Type (dB) (degrees)
Bi-conical 0 to 5 40 to 70
Horn 5 to 20 5 to 10
Helix 5 to 20 360
Patch 0 to 10 60
Dipole 1 to 3 360
Mono-Dipole 1 to 6 360
Parabolic 15 to 65 <1 to 10
Comms Slides Boeing
5. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Link Budget
Main Dish Downlink
Frequency (GHz) 19.500
Data Rate (GB/s)(bps) (1.68)(1.45e10)
RF Transmit Power (W) 111
Transmit Antenna Gain (dB) 47.12
Margin (dB) 3.78
Polarization RHCP
FEC 3/4
Modulation 64-QAM
Compression Lossless
Comms Slides Boeing
6. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams
Comms Slides Boeing
7. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams Cont.
Comms Slides Boeing
8. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Requirements
Description Specifications Source
DeLorme InReach,
Supported Devices RFP
SPOT, and SARLINK
Frequency
Device Power (W)
(MHz)
SPOT I & II LLC 7 1610-1620
ARC SARLINK 5 406.0-406.1
DeLorme InReach 7 1616-1626
Comms Slides Boeing
9. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Link Budget
DeLorme DeLorme
SPOT I & SARLINK
InReach Inreach
II (Uplink) (Uplink)
(Uplink) (Downlink)
Frequency
1.615 0.406 1.621 1.621
(GHz)
Data Rate
1045 1045 1045 1045
(bps)
RF Transmit
7 5 7 5.1
Power (W)
Transmit
Antenna Gain -8.49 -20.4 -8.45 23.1
(dB)
Margin (dB) 4.47 3.01 4.47 3.1
Comms Slides Boeing
10. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams
Comms Slides Boeing
11. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams Cont.
Comms Slides Boeing
12. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Requirements
Description Specifications Source
Transmit Frequency C-Band(4006.47 MHz) RFP/Derived
Receive Frequency C-Band(6006.47 MHz) RFP/Derived
Transmit Orientation Transmit in any Derived
Receive Orientation Receive in any Derived
Margin 3dB Derived
Position Accuracy <1km Derived
Nominal Operations Ground
2m Colorado RFP
Antenna
Transit Ground Antenna (List Them) Derived
Comms Slides Boeing
13. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Trades
DORIS versus GPS
DORIS: 23 W typical, 30W for 2hr warmup
GPS: 10W Mosaic GNSS Receiver
DORIS: 420mm x 160mm diameter helical antenna, 2kg
390 x 370 x 165mm, 18kg electronic support box
GPS: 10dB gain antenna with 40 degree beamwidth
272 x 284 x 92 mm, 3.9kg electronic support box
Omni versus Patch
Omni: Less ESD and easier to manufacture
Patch: More ESD and harder to manufacture
Omni: Less switches, made longer to look around vehicle edges
Patch: More switches, requires extra structure to look around
Comms Slides Boeing
14. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Link Budget
Uplink Downlink
Frequency (GHz) 6.006 4.006
Data Rate (bps) 9e4 9e4
RF Transmit Power (W) 10 5.3
Transmit Antenna Gain (dB) 39.39 6.78
Margin (dB) 5.82 3.07
Polarization RHCP RHCP
FEC 1/2 1/2
Modulation BPSK BPSK
Comms Slides Boeing
15. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams
Comms Slides Boeing
16. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams Cont.
Comms Slides Boeing
17. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Requirements
Description Specifications Source
2.75 GB/s from
Data Rate RFP
Payloads
Buffer 3 minutes Derived
MIL-STD 1553,
Interface RS-422, RS-232, Derived
SpaceWire, LVDS
Comms Slides Boeing
18. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Trades
Bus Architecture Pros Cons
1 Central Computer 1 Hard to add nodes
Centralized
2 Highly reliable 2 Large wire harnesses
1 Small wire harnesses
Ring 1 Less reliable
2 easy to add nodes
1 Deterministic Data
transmission 1 Specific
Federated 2 Fewer Processors physical/electrical
3 interfaces
Failures not as
catastrophic
1 More complex testing
Distributed 1 Highly reliable
2 More Processors
Comms Slides Boeing
19. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams
Comms Slides Boeing
20. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams Cont.
Comms Slides Boeing
21. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Block Diagrams Cont.
Comms Slides Boeing
22. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Requirements
Description Specifications Source
ADCS, Thermal,
Power, Propulsion,
Support Subsystems Derived
Communications, and
Rendezvous
Monitoring,
Support Fault Detection Identification, and Derived
Correction
Comms Slides Boeing
23. Main Dish
Permanent Payload
GEO Bird
TT&C
SV
C&DH
Software
Software Allocation
Computer Software Source Lines of Typical
Component Code Throughput
Executive 1000 60
Communication 4500 20
Attitude/Orbit Sensor
3600 30
Processing
Attitude Determination and
27300 133
Control
Attitude Actuator Processing 2400 6.2
Rendezvous 19800 51.2
Fault Detection 11500 22.5
Other Functions 7700 121
Total 85600 443.9
Total w/ FS=1.5 128400 665.85
Comms Slides Boeing
25. TT&C
GEO Bird
C&DH
SV
Software
Requirements
Description Specifications Source
Transmit Frequency C-Band(4006.47 MHz) RFP/Derived
Receive Frequency C-Band(6006.47 MHz) RFP/Derived
Transmit Orientation Transmit in any Derived
Receive Orientation Receive in any Derived
Margin 3dB Derived
Position Accuracy <1km Derived
Nominal Operations Ground
2m Colorado RFP
Antenna
Transit Ground Antenna (List Them) Derived
Comms Slides Boeing
26. TT&C
GEO Bird
C&DH
SV
Software
Trades
DORIS versus GPS
DORIS: 23 W typical, 30W for 2hr warmup
GPS: 10W Mosaic GNSS Receiver
DORIS: 420mm x 160mm diameter helical antenna, 2kg
390 x 370 x 165mm, 18kg electronic support box
GPS: 10dB gain antenna with 40 degree beamwidth
272 x 284 x 92 mm, 3.9kg electronic support box
Omni versus Patch
Omni: Less ESD and easier to manufacture
Patch: More ESD and harder to manufacture
Omni: Less switches, made longer to look around vehicle edges
Patch: More switches, requires extra structure to look around
Comms Slides Boeing
27. TT&C
GEO Bird
C&DH
SV
Software
Link Budget
Uplink Downlink
Frequency (GHz) 6.006 4.006
Data Rate (bps) 9e4 9e4
RF Transmit Power (W) 10 5.3
Transmit Antenna Gain (dB) 39.39 6.78
Margin (dB) 5.82 3.07
Polarization RHCP RHCP
FEC 1/2 1/2
Modulation BPSK BPSK
Comms Slides Boeing
32. TT&C
GEO Bird
C&DH
SV
Software
Trades
Bus Architecture Pros Cons
1 Central Computer 1 Hard to add nodes
Centralized
2 Highly reliable 2 Large wire harnesses
1 Small wire harnesses
Ring 1 Less reliable
2 easy to add nodes
1 Deterministic Data
transmission 1 Specific
Federated 2 Fewer Processors physical/electrical
3 interfaces
Failures not as
catastrophic
1 More complex testing
Distributed 1 Highly reliable
2 More Processors
Comms Slides Boeing
