1,721,105 research outputs found
Lessons Learnt from the design & operation of a search & rescue UAV in the ARCAA UAV Outback Challenge 2007
No full textThe team is divided into four main technical areas; aircraft systems, airborne platform, target acquisition and ground station The UAV aircraft system integrates GPS, accelerometers, gyros, pitot tubes (static/dynamic) and an ultrasonic for accurate above ground estimation for landing. It is hoped to be able remove the GPS and integrate in DGPS from GPSatSys for a more accurate solution, the mission strategy relies on an accurate delivery to give us the edge in this competition. This however, is seemingly extremely unlikey for the 2007 entrant. For image processing, a human-in-the-loop is aimed at for a baseline. The next phase is to try to identify the human (processing on the ground) in both IR and EO spectrums. The viability of an IR solution in daylight is currently being tested. The final Phase, but this may not be ready for 2007, is to statistically fuse these two filtered images and have completely automated identification. There are three communication links in the SRUAV system. The command and control link will be implemented using a 900MHz FHSS 9.2kbps radio modems (MicroHardCorp). Additionally, a 2.4GHz transmission of PAL video is the baseline for the secondary link. A tracking antenna will track this link with the UAVs position being fed in via RS-232 from the Ground Station.\ud
The platform in which testing of the system was conducted was essentially a trainer-style model aeroplane called a Big Lift and dubbed “Emigo”. Modifications were made, doubling the engine size, to attain speeds considered necessary to complete this mission with some contingency time (around 180 km/hr). Once designed and tested these systems were implemented on a more efficient structure based around the Burt Rutan Long-EZ. This is a 2.4m wingspan aeromodel, a pusher prop canard wing. The structure has been reinforced, and a more powerful engine is used (50cc). We will also add various modifications to the fuselage, etc for housing electronics
Flying robots to the rescue
No full textUAVs could one day save the lives of lost civilians and\ud
those sent to find them, and a competition in outback\ud
Australia is proving how soon that day might come.\ud
We have all seen news stories of people who ventured\ud
beyond the day-to-day reach of the community and got lost:\ud
search parties are formed, aircraft drafted in, and\ud
often large sums of money expended in the quest to find them
Prediction and Analysis for GPS Susceptibility to Multipath and Spoofing for Land and Space Applications
No full text
Single Antenna Attitude Determination for FedSat
No full textFedSat is the first satellite to be launched by Australia for 30 years. It is will be a scientific spacecraft with a number of experimental payloads. These payloads comprise of a single antenna GPS receiver, a 3-axis magnetometer, a Ka Band transponder and a re-configurable computing payload. It will be launched by Nasda on a H2A rocket as a piggyback payload with ADEOS-2.\ud
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The GPS receiver is a NASA JPL designed "BlackJack" receiver, which was provided to the CRCSS by NASA. The high-level objectives, for the GPS receiver on the FedSat mission, are to provide an orbit determination capability and an attitude determination capability, whilst operating within strict power budget requirements. The current baseline is a total of 20 minutes of operation per 100 minute orbit.\ud
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This paper presents the history of the attitude determination capability for FedSat, an outline of the antenna gain pattern tests performed for FedSat, a summary of results obtained to date, and recommendations for new approached to improve the performance of single antenna attitude determination systems
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