Joint TDOA-FDOA Fast Estimation Algorithm Based on Cross-ambiguity Function

Deduce the cross ambiguity function using inner product.For the signal transmitted from the target is received by two different receivers,use cross ambiguity function to figure out the TDOA and FDOA between the two received signals.Transformed suitably,the cross ambiguity function formula can be counted as making a FFT to the inner production of the two signals,then find the max from the transformed data in two-dimensional search,which reduces calculation largely.Furthermore,simplify the Fourier transform term reduces calculation largely,meanwhile saves calculation time.