TM NO, 377 



'^i^^K^t^f rj = ^(■^)e'^'^J'^j (A»33) 



and 



. — f *** i'-^ Tj 



Thus J, the auto=covarlancej, as shown in chapter III, is the Foixrier transform 

 of the spectrum function. Substituting equation (A'=>23) into (A=26): 



Letting -ijoX^t- ^tj 



^C - -^ > (A=36) 



and since 





equation (A-35) nJay be vritten in the form; 



■.^T).,4,J ^Me''-""^- ^ 



or 



Now: 



Thus: 



or 



4>.Cr)4,4>jr).^^! ^S^^v, (-) 



-eo 





twfvi = rv 4^<^''-i ^ i>ft^ '♦'"^'■^ • 



A-7 



