Effective directivity by DSP
Digital Signal Processing makes effective directivity possible similar to large directional antennas using an array of two antennas (two active small “magnetic” loop antennas) and two phase coherent receivers (FT1000D or two K2’s).
Both signals of the antennas/receivers are converted into the frequency domain.
For each frequency component the phase difference (actually Time Distance Of Arrival, TDOA) between the two signals is calculated.
Frequency components are then selected or rejected on their actual phase difference.
Phase selectivity equals directivity
Last update: September 24, 2006