[casper] problem

[A. A. Krzemien]

Hallo 
One wave signal is received as harmonic in three different points. Each 
receiver registers in the same time three signal value:
 ?si,j=Ai*sin(pi+f*tj)    points i=1..3    time j=1..3.
Based on this 9 numbers and time tj please calculate: A amplitude, f frequency 
and phase different pk-pl . Is this solution important for signal source 
location?
   With best regards Aleksander k\Krzemien