Taking the fourier transform of this windowed ccf produces the time - domain filtered cross spectral density ( tdfcsd ) . the snr can be improved with using the character of noise which distribute uniformly in frequency domain
2.
The results show that the difference of the properties between the two tv towers is great , and the influences of the structural high order modes as well as the structural cross spectral density on the internal force are obviously , so that this effects on structural internal force must be taken into account comprehensively in the aseismic design of tall tv tower
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