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1、Copyright©1996,GregoryT.French.Allrightsreserved.Nopartofthisworkmaybereproducedinanyform,orbyanymeans,withoutthepermissionofthepublisher.Exceptionsaremadeforbriefexcerptstobeusedinpublishedreviews.PublishedbyGeoResearch,Inc.8120WoodmontAvenue,Suite300Bethesda,MD20814LibraryofCongressCatalogCardNumb
2、er:9680018ISBN:0-9655723-O-7PrintedintheUnitedStatesofAmericaThisbookisavailableatquantitydiscountsforbulkpurchases.Supplementalmaterialsforinstructorsandtrainersareavailableinvariousmedia.Forinformation,call800-GEOLINKor301-664-8000.PrefaceThereisanever-growingsupplyofinformationabouttheGlobalPosit
3、ioningSystem.Unfortunately,thesenew(andnow,somenotsonew)documentsseemtobelocatedateachendofthecomprehensionscale:eitheratthe“gee-whiz”levelwhichbasicallydescribeshowinter-estingandusefulthisnewutilityis,orattheengineer’slevelwhichstartsoutwithKeplerianorbitsandHopfieldModeling.Whatseemstobemissingis
4、acomprehensive,yeteasytounderstand,presentationoftheGlobalPositioningSystem(GPS)forpeoplewhomayhaveaveryrealneedtoapplythisnewtechnologybutlackthebasicunderstandingnecessarytomakeimportant,andoftenexpensive,decisionsaboutit.Thusthisbook.Thisbookisdesignedtosupportanintroductorycourseonthefundamental
5、softheGlobalPositioningSystembasedonaseriesofgraphicrepresentationsanddistilledconcept-bullets.Mathisscrupu-louslyavoided-thatlevelofinformationisreadilyavailablethroughnumeroushighlytechnicalpublicationsandisnomorenecessaryformostusersthanisatextbookonelectronicsnecessaryforthepurchaserofatelevisio
6、nset.Eachconceptispresentedinonetofourgraphicsfoundinthisbookontheleftpageofeachpage-pair.Theopposingrightpagepres-entsabriefdiscussionoftheconcept.Whilemuchmorecouldbesaidoneachofthetopicspresented,onlythosehighlightsconsideredbytheauthortobeofmostimmediatevaluetothegeographer,projectman-ager,field
7、technician,orothersneedingtolearnthefundamentalsoftheGPSareincludedhere.Attheendofthebook,thereisalistofsug-gestedreadingsforthosewhoareinterestedingatheringmorein-depthanddetailedinformationonmostoft