1. The document describes a data link dish and communication system for a satellite with 16 Gbps live stream imaging capability and minimum 1 hour imaging periods with omnidirectional coverage for tracking, telemetry, and command (TT&C). 2. It provides specifications for the dish such as 49.84 dB peak gain and link budgets for payload data downlinks and TT&C downlinks to various ground stations. 3. Components described include a modified Space Micro transmitter capable of 3.2 Gbps, a Cassegrain reflector antenna, and transmitters for TT&C in S-band and payload data in K-band.

1. Jorge Peterson & Zach Montoya
Communications
Data Link Dish
● 16 Gbps Live Stream incompressible data
● Minimum 1 hour imaging
● Omnidirectional coverage for TT&C
● TT&C access during imaging
● No single point failures
Parameter Value Notes
Peak Gain 49.84 dB Includes
subreflector
blockage, spillover
Strut Blockage -0.16 dB 0.04 m2
strut area
Rms loss -0.03 dB 0.25 mm surface
deviation
Total 49.65 dB HPBW = 0.566°
Dish Feed
Link Budgets
TT&C Antennas
Requirements
TT&C
Payload Data
Channelization
Space Micro μKATx -
300 Transmitter
● modified for 64 QAM
● Spacewire LVDS
8/16 bit input
● up to 3.2 Gbps
● 100 krad, latchup
immune
● K-band Center Fed
Cassegrain
● RHCP + LHCP
● F/D = 0.3
● Scalar Feed Horn
○ -30 dB XPOL
isolation
○ -10 dB EI
○ 12° taper angle
Payload - Downlink Grimstad Anchorage
Center Freq GHz 20.0 20.0
Diameter m 1.75 1.75
Gain dBi 49.65 49.65
Line Loss dB -6.45 -6.45
TxPower/ch W 65 65
EIRP dBW 61.33 61.33
Max Distance km 16000 15700
Net Path Loss dB -215.88 -212.04
Diameter m 16.00 10.50
Gain dBi 68.63 64.97
Line Loss dB -2.00 -2.00
G/T dB-K 43.63 39.97
Available Eb
/N0
dB 21.39 21.58
Required Eb
/N0
dB 18.00 18.00
Link Margin dB 3.39 3.58
Payload
● K-band
● 64 QAM
● BER = 10-6
○ 2.679 Gbps
● PTx
= 851 W-DC
TT&C
● S-band
● BPSK, R = ½
● 150 kbps
● PTx
= 92 W-DC
TT&C - Downlink Troll Singapore Grimstad Anchorage
Center Freq GHz 2.00 2.00 2.00 2.00
Gain dBi -2.00 -2.00 -2.00 -2.00
Line Loss + Backoff dB -5.00 -5.00 -5.00 -5.00
Tx Power W 37.00 37.00 37.00 37.00
EIRP dBW 8.68 8.68 8.68 8.68
Max Distance km 3380 15830 16000 15700
Net Path Loss dB -170.71 -183.97 -183.75 -183.57
Diameter m 7.30 9.00 4.00 4.00
Gain dBi 41.82 43.63 36.59 36.59
Line Loss dB -2.00 -2.00 -2.00 -2.00
G/T dB-K 14.82 16.63 9.59 9.59
Available Eb
/N0
dB 10.36 9.19 9.36 9.54
Required Eb
/N0
dB 5.50 5.50 5.50 5.50
Link Margin dB 4.86 3.69 3.86 4.04
Open Ended Quadrifilar Helix
Freq 2 GHz
Polarization RHCP
Peak Gain 4.425 dBi
HPBW 142.2°
+Z Omni
-Z Omni
TWTDual EPC
Transponder
Hybrid
Splitter
Isolator
Waveguide
Rotary Joint
Flex
Waveguide
Transmitter
Dual EPC
TWT
Switches
Tracking
Receiver
Omux OMT
Diplexer