Active Shooter Tactical Response Assistant Design Slides

Transcription

1 Active Shooter Tactical Response Assistant Design Slides Team : Ben McCall, Puja Patel, Joel Williams, Rohini Shah, Aryan Toughiry GMU Sponsors: Dr. Hintz & Dr. Wage 1/28

2 Network of nodes with microphone arrays. Nodes can detect and localize a gunshot in an outdoor area. displays the location of a shooter on a map screen within seconds of the first shot. Provides law enforcement, emergency medical teams and first responders with critical information during a lifethreatening event. Overview 2/28

3 Why is essential? According to the FBI in the last seven years the average number of Active Shooter events has risen to 17 incidents a year. According to the FBI, since 2003 there have been 1,043 casualties due to Active Shooters. 3/28

4 s Functions is comprised of a network of direction finding nodes and a data receiver Each node independently plots a vector to the shot The Data Receiver collects the vectors from each node and plots them on a map 4/28

5 Architecture Node 1 Node 2 Node 3 Data Receiver 5/28

6 Shot is detected by Acoustic Sensor Array of Nodes Node 1 Node 2 Node 3 Data Receiver 6/28

7 Each Node plots back a directional vector back to the source Node 1 Node 2 Node 3 Data Receiver 7/28

8 Vectors Data Packets are sent to the Data Receiver Node 1 Node 2 Node 3 Data Receiver 8/28

9 Intersection of Directional Vectors Shows Approx. Shooter Location Data Receiver Terminal Window 9/28

10 Technology and System Wide Requirements The nodal network assumes an outdoor area with no physical obstruction between nodes (green field environment) The shooter is assumed to be inside the geometric boundary that the network of nodes creates. The amplitude of the environment noise will be no greater than 25% of the amplitude of our quietest test firearm. assumes there are no extreme weather conditions (i.e. high cold/hot, rain, wind). Weather must be above 32 degrees F and below 100 degrees F. Wind must be less than 10 mph. Rainfall must be no greater than.10 inches per hour. 10/28

11 node GNURadio TDoA processing TCP Message Flow Chart Data Receiver node GNURadio TDoA processing TCP Message Wireless network connection TCP server JAVA to KML script KML file Google earth User Terminal node GNURadio TDoA processing TCP Message 11/28

12 Single Node Architecture Omni Mic Omni Mic A/D LINUX CPU running Octave, Gnuradio, python Detection Filter Phased Array Direction Calculation GPS position GPS/TCP packetization Wireless Backhaul Omni Mic Omni Mic 12/28

13 Bank of Match Filters Glock 17 Glock 19 AK 47 Glock 26 AR15 AR (Sniper Rifle).22 Rifle 13/28

14 s 6 Step Testing Process 1.Single Node Benchtop Testing 2.Single Node Loud Speaker Testing 3.Single Node Live Fire Testing 4.Multi Node (3 nodes) Benchtop Testing 5.Multi Node (3 nodes) Loud Speaker Testing 6.Multi Node (3 nodes) Live Fire Testing 14/28

15 Complete Working System 15/28

16 Outdoor Shooting Range Test Layout FIRING LINE Direction Of Fire 16/28

17 8/15/

18 User Terminal PRE-SHOT DISPLAY POST-SHOT DISPLAY Approx. Shooter s location Approx. Shooter s location 18/28

19 GPS error on User Terminal 1.54 meters (LONG) 1.22 meters (LAT) 19/28

20 Angle Error on User Terminal Window degrees degrees 20/28

21 Circular Error Probability (CEP) on User Terminal CEP=0.62 σy+0.56 σx σy= 1.06 meters σx= 2.66 meters 4.28m Novatel Study: APN-029 Rev 1, 3DEC /28 8/15/2017

22 CEP Shown in User Terminal View PRE-SHOT DISPLAY POST-SHOT DISPLAY 22/28

23 System Error Results Mean Angle Error (degrees) STDEV GPS Error (meters) Circular Error of Probability radius (meters) Combined Standard Deviation (meters) Node 1 Latitude Node 1 Node 2 Node Node 1 Longitude Node 2 Latitude Node 2 Longitude Node 3 Latitude Node 3 Longitude CEP 2.15 CSD /28

24 Adaptive Threshold Cell Averaging Constant False Alarm Rate (CA-CFAR) Cumplido, R., C. Torres, and S. Lopez. On the Implementation of an Efficient FPGA-Based CFAR Processor for Target Detection. (ICEEE). 1st International Conference on Electrical and Electronics Engineering 24/28

25 Magnitude (DB) CA-CFAR Plot Using Recorded Gunshot Data = Threshold = Data Thresh Xing Threshold Samples 25/28

26 Cost of Item QTY Individual cost Total QTY cost Ubiquity 900MHz link 6 $ $ Lighting stand 4 $54.95 $ Tascam US4x4 interface 3 $ $ Movo 2-pack, lavalier microphones 6 $79.99 $ Delrin sheet (12"x48") 1 $51.52 $51.52 GPS puck 3 $30.45 $91.35 Misc hardware: 1 $20.00 $20.00 Per node cost > $ Total cost > $2, Single Board Computer (to be used in future implementation) 3 $ $ Other items needed for system operation: Power supplies 3 $ $1, Laptops 3 $1, $4, /28

27 Man Hours and Contributions Approx. 140 hours per group member, approx. 700 total man-hours. Aryan Toughiry Project Manager Ben McCall Technical Lead Puja Patel Theoretical Lead Rohini Shah & Joel Williams Software Leads 27/28

28 Team 28/28