- 202 



c' = J^CkD) 



- 2iT J (kD) (a cos 23 + h^ sin 23) 

 + 277 J. (kD) (a cos 43 + b sin 43) 



- 277 J, (kD) (a^ cos 63 + b, sin 63) 



5 o o 



q' = 277 J (kD) (a cos3 + b, sin 3) 



- 277 J (kD) (a cos 33 + b sin 33) 



+ 277 J^ (kD) (a^ cos 53 + b,. sin 53) 



5 5 5 



The Fourier series can be accurately truncated to N if J (kD) is 

 negligible for n>N or if an and bn are negligible for n>N, There is a 

 set, then, of 2N equations; N equations from each of the real and 

 imaginary parts of Equation F.l, and each with the unknowns an and 

 bn • The maximum possible value of N is determined by the number of 

 different non-ambiguous cross-correlations possible from the gauges 

 in the array. If there are no ambiguous cross-correlations between 

 the gauges, the number of possible combinations for M gauges is 



