7. PERFORMING ORGANIZATION NAMS) ANDADORES) I. PERFORMING ORGANIZATION

Approved for public release; Avon andlordistribution is unlimited. DOr 'A ~ i 13. ABSTRACT (Maximum 200 wordv) ThM Global Positioning System (GPS) has becom a useful tool In providing relativ survey control. The rlatve positioning accuracies of the GPS arecommonlyon theorderof 1-1 Oparts per miNion Qpp). Thedrawback •a • with relative Pos Is the user must have one or more lwm coto stions In a No the Continennnn S UntedStaes (CONUS), suvey control is abundant Howevw, In the near future, the Corps of Enginers may be asked to provWeengineer and mapping supportto coun ie which ham kid orno mnt networks. In these areas, the enginer and sumeyorwil not have known control to Initite a survey. In this case, the sumveyor wil be required to establish one or more absolute •ntol pontL To dahive absolute positional accuracies of 1-3 meters, th us must occupy the unknown an for 6 b ours. Theoda reducdon wouldtke place atthe Defense M pngAgeny (DMA), Wa on, DC, andteumercuWalfor W@Weto ceiv f4the adjusted coordinates. Rlecently, USAE11. adapted the absolute positioning program created by DMA to runjow on a standard IBM XT or compatible personal compute. After a few hours of data collection, the absolut positioning program CORPSABS allows the user to estimate the three dimensional position within a matter of minutes. The positioning results can be refined when the DMAprecise epheneriles become available. Thispqer qutWis the accuracy of absolute GPS positioning and evaluates he appication to the vilmn sectors oft Corp