Jammer Acquisition with GPS Exploration and Reconnaissance JÄGER
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1 Jammer Acquisition with GPS Exploration and Reconnaissance JÄGER SCPNT PRESENTATION Adrien Perkins James Spicer, Louis Dressel, Mark James, and Yu-Hsuan Chen
2 !Motivation NextGen Airspace Increasing use of GPS! Need reliable signal during landing 2
3 Motivation Newark Int l Airport Example personal privacy device jamming Need to locate and disable jammer quickly 3
4 Motivation Requirements and Simplifications Requirements! Quickly determine location of jamming device! Navigate in a GPS denied environment! Use only a single vehicle! Pinpoint location Initial Simplifications! Stationary jammer! Single jammer! Constant jamming 4
5 !Methodology Jammer Detection Independent of GPS! Bearing to jammer!! Signal strength + heading!! Directional antenna + magnetometer! Multicopter vs. Plane!! Take measurements at fixed points strainsecuritysystems.squarespace.com 5
6 !Methodology Path Planning Represent problems as Partially Observable Markov Decision Process (POMDP)!! Grid-based, offline solution to a probabilistic model of sensor and vehicle motion!! Based on real-time signal measurements and current belief of sensor location, take action that localizes the jammer in the shortest amount of time! Onboard computer actively communicating with flight computer Flight Computer Computer 6
7 !Methodology Positioning Signals of Opportunity Hardened GPS 7 Aviation Signals! Alternate Position Navigation and Time (APNT)! Automatic Dependent Surveillance Broadcast (ADS-B)! Universal Access Transceiver (UAT)! 1090! Distance Measuring Equipment (DME) wifi Digital TV 3G / 4G Cell Network
8 !Methodology Aviation Signals Possible Signals!! Automatic Dependent Surveillance Broadcast (ADS-B)! Universal Access Transceiver (UAT) and 1090!! Distance Measuring Equipment (DME)! Initial testing with UAT signals! Leverage known altitude from barometer 8
9 !System Design System Diagram Weight: 2 kg Power: 12 W Weight: 0.5 kg Power: 8 W! All communication through autopilot! Each system is completely independent and modular!! Each has own power source 9
10 !System Design Vehicle Selection! Target Performance!! 20 minute flight!! 4 kg payload! DJI S1000 Spreading Wings Octocopter!! Frame Weight: 4.2 kg!! Max Takeoff Weight: 11.0 kg! Power!! Max of 4000 W!! 1.5 kg battery payload 10
11 !System Integration Path Planning Two way communication with Autopilot! Hunt Mode for autopilot!! Waits for commands from outside source!! Reports completion of maneuvers! Ground station for testing Flight Computer Computer 11
12 !System Integration Path Planning vehicle autopilot Path planning Ground station Safety pilot Not Human Position Command execution Command Path planning to human 1 Path planning to human 12
13 !System Integration Path Planning vehicle autopilot Path planning Ground station Safety pilot Not Human Path planning 1 to human Command execution Command Human generated commands 2 Human generated commands 13
14 !System Integration Path Planning vehicle autopilot Path planning Ground station Safety pilot Not Human Path planning 1 to human Command execution Position Command 2 Full integration and automation 3 Full integration and automation 14
15 !System Integration APNT Electromagnetic Interference (EMI) 2 sources of interference onboard!! Telemetry antenna at 915 MHz!! Computer at GHz GPS signal before shielding (16 db peak) 15
16 System Integration APNT Electromagnetic Interference (EMI) 16
17 !System Integration APNT Electromagnetic Interference (EMI) Before shielding (16 db peak) 17 After shielding (-2 db peak)
18 !Testing Flight Testing Split series of flights by hardware being flown Series 2:! Pixhawk + APNT Series 1:! Pixhawk Series 4:! Pixhawk + APNT + Path Planning Series 3:! Pixhawk + Path Planning 18
19 Testing Autopilot Only Test vehicle performance! Stability Weight simulation Tethered Testing 19
20 !Testing UAT Ground Test Static and dynamic tests 12 km 40 km 20
21 Results APNT Ranging +235 Pseudorange from San Jose Pseudorange(m) min = Pseudorange from Woodside UAT GPS Pseudorange(m) min =
22 Results Ranging Histo of Pseudorange from San Jose, mean= m, std= m Pseudorange Error Gaussian Fit Histo of Pseudorange from Woodside, mean= m, std= m Pseudorange Error Gaussian Fit
23 Results Static GPS UAT lattitude(degree) longtitude(degree)
24 Results Accuracy 24
25 Results Dynamic GPS UAT lattitude(degree) longtitude(degree)
26 !Testing Flight Testing! APNT!! Constant altitude!! Loiter at each vertex (static)!! Dynamic flight! Jammer Acquisition!! Wifi router to mimic jammer 26 Wifi
27 Future Future Work Flight testing of APNT at Camp Roberts Continued path planning Integration Jammer acquisition testing Hardened GPS vs various signals of opportunity! Explore the options 27
28 Questions?
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