Ex parte CHANG et al. - Page 6

          Appeal No. 2000-2085                                                        
          Application No. 08/803,937                                                  

                 each of the satellites [S1, S2] to the object                        
                 being located.  The object is typically a mobile                     
                 unit or other vehicle such as an aircraft [12']                      
                 having a communications terminal.  The fixed                         
                 ground station signals, as transmitted to the                        
                 object, are referred to herein as forward                            
                 signals.  The object receives these periodic                         
                 forward signals and measures the percent of                          
                 periodic phase offset between the two carrier                        
                 waveforms.  The difference in phase between                          
                 these two carrier waveforms is due to one of the                     
                 signals traveling a longer path length via one                       
                 satellite than the other.  The object transmits                      
                 a return signal [24' , 24b], after some1                                                
                 arbitrary delay in which the amount [of] the                         
                 delay is not important nor required to be known,                     
                 containing the percent offset information.  The                      
                 return signal is transmitted upon the same path                      
                 as the forward signal from the first satellite,                      
                 back to the fixed ground station.                                    
                      In monitoring the received carrier periodic                     
                 signal through the first satellite, the object                       
                 performs functions that slave the clock standard                     
                 of the object to the reception of the periodic                       
                 signal.  Thus the object clock standard is                           
                 offset in time from the fixed ground station                         
                 transmitted signal on account of the signal                          
                 propagation delay.  The object is then allowed                       
                 to transmit the observed percent offset between                      
                 the two forward signals, starting at some                            
                 specific period in the future.  The fixed ground                     
                 station then receives the return signal back                         
                 through the first satellite whenever it comes                        
                 back, but realizes the receipt of a message                          
                 starting with that specific period                                   
                 identification number, or frame, has arrived                         
                 later than the current period being sent out on                      

               According to the Ames specification, reference numeral 24’ in Figure 21                                                                     
          should be 24a’.                                                             

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