XB1 Analog Devices
Transcript of XB1 Analog Devices
John S. Sobtzak, Elie G.Tianang, Varun Joshi, Breana M. Branham, Neeti P. Sonth, Michael DeLuca, Travis Moyer, Kyle Wislinsky, and Dr. Scott E. Palo
College of Engineering & Applied Science, University of Colorado at Boulder
A Deep Space Radio Communications Link for Cubesats: The CU-E3 Communication Subsystem
The CU-E3 Solution CU's Earth Escape Explorer (CU-E3)
The University of Colorado's - Earth Escape Explorer (CU-E3) is a 6U cubesat being designed and built to compete in NASA's Cube Quest Challenge - Deep Space Derby. CU-E3 will be attempting communication from ≥ 4,000,000 km, requiring us to “escape” the influence of the “Earth” and “explore” deep space.
NASA’s Cube Quest Challenge
o The Cube Quest Challenge has two phases:
1. Ground Tournaments (GT-1 thru GT-4)†: - Maximum of $100,000 for any one team. - Phase completed in June 2017.
2. The "In-space Prizes": - 365-day competition period.
a) Lunar Derby • Up to $3 million in prizes. • Technical objectives in propulsion &
communications.
b) Deep Space Derby • Up to $1.5 million in prizes. • Focus on deep space communications
using small spacecraft. • Competition starts at 4,000,000 km:
i. Best Burst Data Rate - $250,000 ii. Largest Aggregate Data - $750,000 iii. Spacecraft Longevity - $250,000 iv. Farthest Communication - $250,000
† CU-E3 placed 2nd during the Ground Tournament phase, earning $80,000, and has been offered a position on the SLS’s EM-1 mission!!!
Challenges Faced by CU-E3
o Size – restricted to 6U dimensions. • Limits power generation and heat dissipation. • Limits transmitter power. • Limits use of classic high-gain antennas.
→ Limits possible radiated signal strength (EIRP)!
o Limited time & money! • GTs’ schedule very short & tight. • Rad-hardened parts too expensive.
→ Could not design everything from scratch. → Use COTS components as much as possible. → Prototype circuits quickly for P.O.C & testing.
o Distance – extremely long range. → EVERY dB COUNTS!!!
The Challenge!
Reflectarray & Horn Antennas
o CU-E3 utilizes a novel, student-designed, reflectarray antenna and feed horn.
• Planar design → fits 6U cubesat form factor. • Utilizes standard PCB microstrip technology.
→ easy and relatively inexpensive to fabricate. • High gain → 22.3 dB at X-band Tx frequency.
o CU-E3’s design includes a second feed horn antenna.
• Provides back-up communication link in the event primary reflectarray antenna does not deploy.
• Lower gain → 12.8 dB, but can still close link.
High-Rate CubeSat Communication System (HRCCS)‡
o CU-E3 will provide the maiden launch for the HRCCS.
• Designed for deep space X-band frequencies. • Provides a flexible communications platform. • Compatible with NASA’s NEN & DSN.
Downlink Budget Analysis Summary
Key Notes
SSC17-P1-07
TX ANTENNA-
Reflect
Array
Feed
Horn
Reflect
Array
Feed
Horn
Reflect
Array
Feed
Horn
SLANT RANGE km
TRANSMITTED EIRP dBm 56.6 47.1 56.6 47.1 56.6 47.1
TOTAL SIGNAL POWER @ OUTPUT OF LNB (S) dBm -82.4 -91.9 -85.9 -95.4 -99.0 -108.5
NOISE POWER DENSITY OF RX @ OUTPUT OF LNB (No) dBm/Hz -123.0 -123.0 -123.0 -123.0 -123.0 -123.0
NOISE POWER OF RX (N) dBm -94.3 -103.8 -97.9 -107.4 -111.0 -112.2
USEFUL BIT RATE bits/s 608 68 270 30 13 1
ENERGY PER BIT (Eb) W/bit -110.3 -110.2 -110.3 -110.2 -110.1 -108.5
Received SNR (@ OUTPUT OF LNB) dB 11.9 11.9 11.9 12.0 12.0 3.7
Resulting Eb/No dB 12.7 12.7 12.7 12.8 12.8 14.5
Link Margin dB 6.10 6.12 6.11 6.15 6.22 7.86
4,000,000 6,000,000 27,000,000
‡Palo, S.E., “High Rate Communications for CubeSats”, Proc. of the IEEE International Microwave Symposium, Phoenix, AZ, 2015.
‡ Palo, S.E., D. O’Connor, E. DeVito, R. Kohnert, G. Crum and S. Altunc, “Expanding CubeSat Capabilities with a Low Cost Transceiver”, Proc. of the AIAA Small Satellite Conference, Logan, UT, 2014.
XB1
I
LR
LO
XB1 CDH Tx_HRCCS_FPGA
RS422
EIRP
+56.6 dBm
C-BAND UPLINK
5182 MHz
Rx_IF_BPFLark Engineering
LO = 4770 MHz
+35.5 dBm
PLL
Rx_OCXOTaitien
XO-0087_TT
100 MHz
Rx_PCB
CDH/FSW
ADCS
EPS
Rx_COAX_2IF = 450 MHz
LF
X-BAND DOWNLINK
8447.6 MHz
Tx_PA_PCB
RF = 5210 MHzRx_COAX_1
Rx_MixerMini-Circuits
SIM-73L+
Rx_LNAPasternack
PE15A1010
NF dB
Gain dB
Rx_C-Band_PatchGain dBi
Rx_PLL_VCOAnalog Devices
HMC833LP6GE
– MHz
Rx_VCO_AmpAnalog Devics
HMC3587
Rx_COAX_3 Rx_COAX_4
Tx_PAAnalog Devices
HMC7357LP5GE
P1dB dBm
PAE
Tx_SWDow-Key Microwave
401T-420832
RL dB
IL dB
Tx_PA_VRLinear Technologies
LT8610AC
η A
Tx_COAX_2IL dB
8.0 V
8.9 V
Vgg
Bias
Controller
Tx_HRCCS_PCB
Voltage
Regulator
Processor/
FPGA
RF = 8447.6 MHz
L
R
I
Rx_UHFAstronautical
Development
Lithium - 2
Quad
Modulator
Tx_COAX_1
HRCCS
CU/NASA/LASP
Tx_Hybrid_1Anaren
1E0018-3
RL dB
IL dB
+35.1 dBm
Tx_COAX_3IL dB
Tx_COAX_4IL dB
Tx_Hybrid_2Anaren
1E0018-3
RL dB
IL dB
Tx_Feed_HornGain = 12.8 dBi
Tx_Reflect_ArrayGain = 22.3 dBi
Tx_COAX_5IL dB
Tx_COAX_6IL dB
Tx_COAX_7IL dB
Tx_COAX_8IL dB
+34.5 dBm
+34.5 dBm
EIRP
+47.1 dBm
XB1 CDH Rx_PLL_VCO
SPI
XB1 CDH Rx_UHF
RS422