ENLARGE |
This is a spectrogram
of an uncompressed,
unaltered signal. Notice that there are two pulses - known as
trans-ionospheric pulse pairs (TIPPs).
This spectrogram was created using a windowed fourier transform. The windows used is a 128-point Hanning function (half-cosine function). The horizontal yellow lines are CW carrier frequencies. These wiill be removed by a process called prewhitening - our next step. The frequency ranges from 25.5 MHz to 50.5 MHz with a center frequency of 38 MHz and a sampling rate of 50 Megasamples per second. |
