| 摘要 |
A multifrequency code receiver for signals consisting of the sampled and encoded sum of q sinusoids of amplitudes Af, whose frequencies f are regularly spaced apart by DELTA Fi=p DELTA FO ( DELTA FO being a divisor of the sampling frequency FE) the receiver possessing a heterodyne device transforming each value f into FL-f, a multiple of DELTA FO, a counter counting up to r, where r=FE/FT, FT being the divisor of FE greater than (q-1) DELTA Fi, filtering circuit, a fast Fourier transform (FFT) computer for NT=FT/ DELTA FO samples producing the amplitudes Af. |
