Transcript Document 7271292

http://www.au.af.mil/au/2025/volume3/chap08/img00003.gif
Matt McKeever
Jonathan Baker
UAV Design Team
11/16/2006
Air Data Computer
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Inputs:
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Pneumatic pitot/static data
 Electronic signal from outside temperature probe
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Outputs:
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Mach
Indicated airspeed
True airspeed
Vertical speed
Static air temperature
Total air temperature
Uncorrected pressure altitude
Barometric corrected altitude
Specifications:
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Power: 28 V DC, 8 W
Weight: 1.5 - 6.0 lb
http://www.sandiaaerospace.com/
Turbofan Engine Management
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Input
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Fan inlet temperature and pressure
Fan rotor speed (N1)
High-pressure compressor inlet
temperature and pressure
Core rotor speed (N2)
High-pressure compressor exit
temperature and static pressure
http://www.wikipedia.org/
Low-pressure turbine blade temperature
Bypass duct static pressure at the mixing plane
Low-pressure turbine exit temperature and static pressure
Results
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Good running engine
Engine pressure ratio and other data to pilot
Multi-Spectral Data Fusion
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Energy of spectral features contained in low frequencies
Energy of spatial features (edges) contained in high
frequencies
Multiple narrow spectral sensors provide a better
spectral resolution
www.airsurvey.com
Missile Warning Sensors
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Multi-Imaging Multispectral (MIMS)
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Two color IR sensor
Eliminates background clutter by
using separate IR bands
Weight: under 6.5 lb
Power: 28 VDC, 20-50 W
http://www.dsd.es.northropgrumman.com/DSD-Brochures/dircm/mims.pdf
Navigation
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Redundant Inertial Reference Systems
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Uses a ring laser gyro to sense angular rate about the roll, pitch,
and yaw axes
Uses accelerometers to measure linear acceleration in the roll,
pitch, and yaw directions
Uses magnetometer to sense direction
Generally 2-3 on board
Cross-checked with one another for accuracy
If available, compared to GPS
Power: 28 V DC, 2-60 W
Weight: 2-30 lb
Flight Management Computer
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http://www.ngnavsys.com
Does actual cross-checking for IRS’s and GPS
Uses input from Air Data Computer, IRS, GPS, and Enhanced
Ground Proximity Warning System to navigate
Stereoscopic Imaging
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Two cameras spaced apart and focused at
the same object
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Gives a 3D effect when the images are
combined
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Can be used to estimate height of
vegetation or structures
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Ratio of camera-to-camera distance and
camera-to-subject distance needs to be
greater than 1/400 to retain stereoscopic
effects.
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Greater than 1/80 is ideal
http://www.khai.edu/eng/niipfm/images/strizhm-pic.jpg
Terrain Collision Avoidance
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Enhanced Ground Proximity Warning System
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Radar altimeter
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Sends warning if projected path
will collide with the terrain
Accesses database of terrain
Incorporates sink rate
Altitude is inputted
Indicates distance from
ground to aircraft
Important in landing
Landing Warnings
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http://www.stickeen.com/
If LG and/or flaps are not down, and radar altimeter or air data
computer senses below 2500 ft, pilot is warned of the situation
If sink rate is too high and radar altimeter senses a very low
altitude, pilot is warned they are sinking too fast
Sensor Fusion and Design Teams
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AIAA:
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HPA:
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Flight and engine computers will most likely be required
Possible integration of anti-missile technologies
Majority of sensors are not large or heavy
No real need for sensor fusion, or sensors in general
Must be able to shave as much weight as possible
UAV:
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Platform is designed and built around advanced sensor
technologies
Space and payload are very limited
A stable aircraft is desired for aerial photography
Conclusions
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Adds reliability and safety
to the aviation community
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Adds new and exciting
reconnaissance and
surveillance capabilities
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Provides redundancy and
accuracy
http://www.softwaretechnews.com/stn4-1/afrlsensors.html
References
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http://digilander.libero.it/andreatheone/irs.htm
http://ieeexplore.ieee.org/iel5/8352/26315/01167127.pdf
http://ieeexplore.ieee.org/iel5/9126/29027/01308901.pdf
http://www.dsd.es.northropgrumman.com/DSD-Brochures/dircm/mims.pdf
http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=352808&sear
chString=crossbow
http://www.nsd.es.northropgrumman.com/Automated/products/LTN-101EGNADIRU.html