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The Global Positioning System(GPS) starts commissioning
in1970.It was later released to civilian applications , e.g.
landresource survey,navigation and land mapping , etc.. Recently
,theGPS is becoming more popular, especially in aircraft
navigationand guidance area. It can also assist the aircraft to
avoid badweather effect and to fly more safely. GPS is now being
appliedto auto navigation. The future wide application of GPS
system tohuman life is expected. Because of these, there are
manyresearchers engaged in GPS studies .Among them many are
workingon GPS accurate positioning subjects. The main purpose of
thepresent study in not to discuss the positioning accuracy but
touse GPS signal for further unmanned aircraft autopilot.
Thestudy contains two parts. The first part is to construct a
realtime display system for flight monitoring . It includes a
GPSreceiver and transmits the GPS positioning data and
relatedflight parameters such as flight path , speed ,heading,
etc.via radio transceiver to ground station monitor. It is
hopedthat the design can be useful for further unmanned
aerialvehicle monitoring and control. The second part of the
studyis to discuss the positioning relationship between GDOP(
Geometric Dilution of Precision) and a single GPS receiver.The
purpose is to find a way to smooth the positioning errorsbiased
by satellites signals .A smooth GPS signal will enhancea smooth
and accurate controllable flight, which is veryimportant to an
unmanned aerial vehicle.
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