The Hanning time gate is a tapered window that is applied to a function in the time domain to transfer the function to the frequency domain. Hanning is the default time gate in WinPICS. It is defined as:
1/2 + 1/2cos¥, -pi < ¥ < pi
0, ¥ < -pi or ¥ > pi
The Hanning and Hamming time gates are very similar.