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Senior Design Project In Electrical Engineering

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Senior Design Project in Electrical Engineering GPS Spoof Detection using INS Data 1/c Scott Pratz, 1/c Benjamin Arocho Advisor: LCDR Kelly Seals Sponsor: C3CEN (Liaison: LT Christopher Morris) 36.009 GPS Antenna True Avg Track Ship COG Track 36.008 Location of Spoof 36.007 Latitude (Degrees) GPS Spoofing is an attack in which a ship’s GPS receivers are overpowered by false signals, displaying an incorrect position solution to the user. This project aims to reduce risk and increase integrity for reliance on GPS receivers in the Coast Guard by utilizing data given from the currently installed Mark-39 Inertial Navigation System (INS). The project utilizes GPS antenna route tracing comparisons to be able to determine if the GPS receiver’s displayed information is valid. 36.01 36.006 Received / Spoofed Antenna Track 36.005 36.004 36.003 36.002 Spoofing Scenario 1. Coast Guard is shifting to electronic navigation 36.001 -36 -36 -36 -36 -36 -36 Longitude (Degrees) -36 -35.9999 -35.9999 1. Remove velocity from GPS longitude to convert to east movement 0.015 2. GPS is highly vulnerable system heavily relied on 3. GPS Spoofing will be easier to attack as technology moves forward East Variation (feet) 0.01 0.005 0 -0.005 4. GPS Spoofing detection methods must be created to prevent damage of Coast Guard Assets. -0.01 0 50 100 150 Time Index 200 250 300 2. Convert INS pitch and roll data to east movement 0.4 NovAtel ProPak V.3 Test Receiver Coast Guard shipboard system (SeaWatch) is INS capable 0.3 0.2 East Variation (feet) Uses Commercial Off-the-Shelf (COTS) GPS Receivers and Inertial Navigation Systems INS Coast Guard Mark-39 INS-Capable System 0.1 0 -0.1 -0.2 -0.3 -0.4 Real time GPS spoofing detection 0 50 100 150 Time Index 200 250 300 3. 1-Dimensional comparison of east movement East Position Estimation Independent of known good GPS fix 0.8 0.6 Single Antenna Solution (Low Cost) 0.4 0.2 0 -0.2 High reliance of maritime industry on GPS -0.4 -0.6 Algorithm successfully identifies spoofing in test environments -0.8 INS East GPS East 0 50 100 150 200 250 300 3. Repeat Steps 1-2 for north/latitude and calculate 2-D complex correlation Complex Correlator Coast Guard should investigate methods for spoofing protection 0.02 0.018 0.016 0.014 Any single method of detection has flaws 0.012 0.01 0.008 Recommend Coast Guard invest in receiver with multiple spoof detection capabilities 0.006 0.004 0.002 0 0 50 100 150 200 250