aem 5333 uav search and surveillance. mission description overhead surveillance and tracking –...
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AEM 5333
UAV Search and Surveillance
Mission Description
• Overhead surveillance and tracking–Humans on foot–Moving vehicles
• Onboard GPS transceiver• Onboard camera = autonomous +
manual control capabilities
Flight Conditions
• Light weather capable– Clear to light precipitation and cloud cover. – Light winds gusts less than 10 mph
•Open terrain – Limited by line of sight telemetry
•Moderate air temperatures•Service ceiling limited by telemetry
System Analysis: Requirements of mission profile
• Task elements– Acquire bearings– Acquire settings– Lock on to target– Compute optimum route between target and
tracker using corresponding GPS coordinates– Acquire target using onboard optical sensors– Based on relative velocity of the target compute
encircling trajectory within a predefined radius–Mission profile
Automation• Automation in the task elements
– Autonomous take off script– Climb to cruise altitude– Once airborne acquire GPS signal and establish communications– Compute optimum route to target– Once UAV and target GPS within predefined distance, descend to
observation altitude and switch to optical mode.– Acquire visual signature of target.– Send “target acquired” signal.– Commence hold pattern.– Await for manual control override, else– Compute target velocity via optical tracking– Compute trajectory around target
Sample trajectory
Take off
Climb
Observation Alt 50 ft. AGL
Cruise 200 ft AGL
Land
Cruise 200 ft AGL
Descend
Mission Profile
Payload Analysis
• Payload Functions Needed for Search/Surveillance/Tracking Missions– Flight Computer – IMU– GPS– RC Receiver– Telemetry (Live Video Capable Bandwidth)– Optical/IR/Agriculture Camera– Propulsion/Control Systems
Payload Operation
• Flight Computer– Capable of flight control and optical/GPS tracking
• GPS/IMU– GPS waypoints sent through ground transmitter on target
• Telemetry– Communication of live video, state, GPS, camera operation to ground
receiver for tracking, camera operation
• Optical/IR/Agriculture Camera– Ability to move in 2-DOFs
Mission Profile and Payload
• Tracking and Surveillance– GPS Waypoint/Tracking– Optical Tracking– Live Video Transmission– Remote Camera Operation
Airframe Design Reference
• Higher aspect ratio– Increased efficiency leads to greater range and
endurance• Add dihedral to the wings– Dihedral increases both lateral and roll stability – Creates more stable platform for camera tracking
and observation
Airframe Design Reference
• Higher powered engine– Increases maximum velocity for tracking faster
targets– Allows for shorter take-offs
• Retractable Landing Gear– Smaller form and parasitic drag leads to increased
range and endurance– Allows for unobstructed view of 360° camera
Airframe Design Reference
• Larger capacity battery– Larger energy storage for increased range and
endurance• Larger control surfaces– Allows for more control authority with smaller
servo inputs