TABLE II 

 Data Format for Punched Paper Tape Input to RAPLOT Program 



Field 



Item 



Definition 



Line number 



Time 



Radiation 

 count 



Beacon 1 



Beacon 2 



Spare 



Increases sequentially with each 

 line of data unless manually reset. 



Based upon time accumulation mode, 

 cumulative unless manually reset. 



Pulse from differential discriminator 

 accumulated for time "between lines 

 only (automatically reset at each 

 printing) . 



Distance in tenths of meters from 

 the upcoast fixed shore beacon, 

 automatically changed at each line. 



Distance in tenths of meters from 

 the downcoast fixed shore beacon, 

 automatically changed at each line. 



Reserved for a second radiation 

 channel in a 2-isotope test. 



DX1 is distance of the fix from the upcoast beacon in a direction parallel 

 to a line intersecting the two beacons, and DY1 is distance of the fix 

 from the upcoast beacon in a direction normal to a line intersecting the 

 two'beacons. These coordinates may be rotated and translated to give the 

 Lambert Coordinates of each fix: 



NCOORD = DX1 SIN 6 + DY1 COS + NORTH 

 ECOORD = DX1 COS - DY1 SIN 6 + EAST 



is the angle of rotation of the coordinate system, NORTH and EAST are 

 the Lambert Coordinates of the upcoast radar beacon, and NCOORD and ECOORD 

 are the coordinates of the fix. Experience indicates that the distances 

 to the radar beacons may be erroneous as often as 5% of the time, there- 

 fore, the program checks for errors by determining whether the absolute 

 value of the difference between sequential radar beacon distances would 

 indicate a boat speed greater than k knots, the known maximum speed of 

 the survey vessel. If an error is detected, it is corrected by linear 

 interpolation between valid radar beacon fixes. 



Fixes give the position of the survey vessel at the time of each 

 fix. To plot the radiation values correctly, one must know the location 

 of the detector vehicle somewhere behind the vessel at the end of its 



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