direction finding on spread spectrum signals (dfsss) 2017_files/bmw-2017... · direction finding on...
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Direction Finding on Spread Spectrum Signals (DFSSS)
1/c Shane Corbett and 1/c Kirsten Logan
Project Advisors: Dr. Paul Crilly Dr. Ali Reza
Dr. Richard Hartnett Sponsor:
CG-761 – Mr. Ed Thiedeman
Electrical Engineering Capstone Design
2016-2017
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Introduction • Emergency Position Indicating Radio Beacon
(EPIRB) • EPIRB has aided the CG in saving 39,000 lives
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Needs and Objectives • Problem: Coast Guard assets will not be able to DF
on EPIRBS emitting the new Direct Sequence Spread Spectrum (DSSS) signal
• Goal: Create a continuous and user friendly
system to home in on the new generation EPIRB signal
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Requirements • Make a continuous system
• Make a user friendly system
• Optimize efficiency of the system
• Antenna construction • Cost of hardware
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System Overview
OctoClock
Host Computer
Ethernet Switch
USRP TX
USRP RX
URSP RX
Ethernet Cables
PPS in
REF in
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System Overview Antenna array:
half-wave monopoles
New tower for increased
processing USRPs and Clock equipment rack
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System Overview (rack view)
USRP RX bank
BNC Relays
New Com Tower
To the antennas topside
Calibration signal source
OctoClock
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GNU Radio Companion (GRC)
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GNU Radio Companion (GRC)
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GNU Radio Companion (GRC)
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GNU Radio Companion (GRC)
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Incoming Calibration Signal
USRP1-1
USRP1-2
USRP2-1
USRP2-2
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GNU Radio Companion (GRC)
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Multiple Signal Classification (MUSIC) Algorithm
• R = ASAH + Q Eigen Decomposition of incoming data
• J(θ) = (∑ 𝑎𝑎�𝐻𝐻(𝜃𝜃) ∙ 𝑢𝑢�𝑚𝑚 ) 𝑁𝑁𝑚𝑚=𝑀𝑀+1
-1 Peak estimator function
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• Need to emulate new Direct Sequence Spread Spectrum Signal
• Consists of pseudo random binary data to spread
signal around a center frequency
GRC Transmitter
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GRC Transmitter • EPIRB specs: GMSK: 1bit/symbol, 38,400
chips/sec • Center Frequency: 406.05MHz, null to null
76.8kHz.
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Testing Procedure • Test signal centered at 435MHz, λ=.6892m • Far field pattern assumed at 6.892m
• Test at 15 yards = 13.716 or approximately 2 times
the far field
• Calibrate and then data collect
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Testing Procedure
Transmitter Receiver
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Initial Problems Encountered • Trouble understanding how to test the system • Error due to multipath
Narrow Band, angle 6 degrees Wide Band, angle 0 degrees
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Narrow Band Data
Angle 0o Test 1 (blue) 2.5 Test 2 (red) 2.3
Test 3 (green)
5.1
Average 3.3
Angle 30o Test 1 34
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Wide Band Data
Angle 0o Angle 30o Test 1 (blue) 1.8 Test 2 (red) 3.6
Test 3 (green)
5.5
Average 3.6
Test 1 (blue) 35.9 Test 2 (red) 31.8
Test 3 (green)
31.1
Average 32.9
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Wide Band Data
Angle 45o Test 1 (blue) 52.8 Test 2 (red) 50.1
Test 3 (green)
49.1
Average 50.6
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Continuous System • Road to completion
• MUSIC Block • User Datagram Protocol (UDP) • MySQL
• Achieved through MatLab© and LibreOffice Base
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Continuous System
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Wide Band Data
Angle 0o Angle 30o
Average 3.6
Std. Dev. 1.85
Average 32.9
Std. Dev. 2.59
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Wide Band Data
Angle 45o
Average 50.6
Std. Dev. 1.91
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Future Work • Expand to multidimensional array
• Explore optimization
• Create EPIRB message
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Acknowledgements • Dr. Paul Crilly
• Dr. Richard Hartnett
• Dr. Ali Reza
• CDR Armstrong
• Class of 2017 EEs
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Questions?