Spectral Enhancement and Fourier Limitations

Fast Fourier Transform

1. If I am analyzing random data and I have taken 10 independent averages, what is my uncertainty in the magnitude of the spectrum in %? 2. If I have recorded 1000 sec of data and have performed Fourier Analysis with 100 independent averages, what is my frequency resolution? 3. If I am using the Hanning function, what is the minimum amount of overlap should use when averaging? 4. If the frequency content in my signal is varying with time, what technique might I use to analyze it? 1. If I am analyzing random data and I have taken 10 independent averages, what is my uncertainty in the magnitude of the spectrum in %? 2. If I have recorded 1000 sec of data and have performed Fourier Analysis with 100 independent averages, what is my frequency resolution? 3. If I am using the Hanning function, what is the minimum amount of overlap should use when averaging? 4. If the frequency content in my signal is varying with time, what technique might I use to analyze it