Ex parte CHANG et al. - Page 5




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


            under 35 U.S.C.  103(a) as being unpatentable over,                      
            Ames.                                                                     
                 Claims 3, 4, 6, 7, 9 and 14 through 19 stand                         
            rejected under 35 U.S.C. 103(a) as being unpatentable                     
            over Ames.                                                                
                 Attention is directed to the appellants’ main and                    
            reply briefs (Paper Nos. 20 and 22) and to the examiner’s                 
            final rejection and answer (Paper Nos. 15 and 21) for the                 
            respective positions of the appellants and the examiner                   
            with regard to the merits of these rejections.                            




                                     DISCUSSION                                       
                 Ames discloses a dual satellite navigation system                    
            and method for determining the position of a mobile                       
            object such as an aircraft 12'.  The system includes a                    
            fixed ground station 10, a primary satellite S1 and a                     
            secondary satellite S2.  As described by Ames, and with                   
            particular reference to Figure 2,                                         
                 ground station [10] continuously transmits two                       
                 radio signals [20a, 20b’; 22a, 22b’], each with                      
                 an identical periodic carrier modulation, via                        
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