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短基线定位系统中通用宽带应答器的设计与实现的中期报告.docx

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短基线定位系统中通用宽带应答器的设计与实现的中期报告 Abstract Inthisreport,wepresentthedesignandimplementationofageneral-purposebroadbandresponderforshortbaselinepositioningsystems.Thesystemconsistsofarespondermodule,acentralprocessingunit,andawirelesscommunicationmodule.Therespondermodulegeneratesacontinuouswavesignalthatistransmittedtothecentralprocessingunit.Thecentralprocessingunitprocessesthesignalandcalculatesthepositionoftheresponder.Thewirelesscommunicationmoduleisusedtotransmitthepositioninformationtootherdevicesinthepositioningsystemortoaremoteserver.Thesystemhasbeentestedandvalidatedinalaboratoryenvironmentwithpromisingresults. Introduction Shortbaselinepositioningsystemsarewidelyusedinvariousapplicationssuchasautonomousvehiclenavigation,precisionagriculture,andlandsurveying.Insuchsystems,aresponderlocatedataknownpositionsendsasignaltoareceiverlocatedonamobilevehicle.Thereceivercalculatesthedistancebetweenitselfandtheresponderusingthetimedelaybetweenthetransmittedandreceivedsignal.Bycombiningthedistancemeasurementsfrommultipleresponders,thepositionofthereceivercanbedetermined. However,thetraditionalnarrowbandrespondersusedinshortbaselinepositioningsystemshavelimitedbandwidthandaresusceptibletointerference.Toovercometheselimitations,wedesignedandimplementedageneral-purposebroadbandresponderforshortbaselinepositioningsystems.Thisresponderiscapableofgeneratingacontinuouswavesignaloverawidefrequencyrange,whichcanbeusedtomitigatetheeffectsofinterferenceandimprovetheaccuracyofpositionestimation. Design Thegeneral-purposebroadbandresponderconsistsofthreemainmodules:therespondermodule,thecentralprocessingunit(CPU)module,andthewirelesscommunicationmodule. ResponderModule: Therespondermoduleisresponsibleforgeneratingthecontinuouswavesignalthatistransmittedtothereceiver.ThemoduleconsistsofanRFoscillator,frequencymodulator,andpoweramplifier.TheRFoscillatorgeneratesacarrierwave,whichismodulatedbythefrequencymodulatortoproduceafrequencychirp.Thepoweramplifieramplifiesthesignalandtransmitsittoth