A VHDL implementation of an on-board ACF application targeting FPGAs
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چکیده
In December 1997, a NASA rocket flew from Svalbard (Spitzbergen) carrying a scientific application computer designed at the Space Science Centre, University of Sussex. The real time science measurements performed by this board is an autocorrelation function (ACF) processing of particle count pulses as a means of studying processes occurring in near Earth plasmas. The ACF is a statistical method that can be used to obtain information about the behaviour of a signal, for instance revealing the presence of periodicity in a noisy signal. The implemented ACF is constructed from a time series of particle count pulses Xi(t), at sampling intervals ∆t, by performing a shift/multiply operation using the first half of the time series. Considering a discrete signal, the ACF amplitude Rj at lag j = 0, 1, ..., (N-1)/2 is described by the equation:
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تاریخ انتشار 1999