The system can be calibrated at any time by using an internally 

 generated phase datum contained in each receiver. Thus each operator can 

 adjust his receiver at will to obtain the same fractional lane reading at a point 

 of given location, without prior calibration at that point . 



SLAVE 



SLAVE 



40'- 

 HYPERBOLIC 



CIRCULAR 



FIGURE VI-5 TYPICAL RELATIVE ACCURACY CONTOURS FOR 



HYPERBOLIC AND CIRCULAR PATTERNS 



166 



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