The core of signal processing is the Discrete Fourier Series computation. Approximately 20-30 sequential 160 point DFS's are computed during the half second of signal received. They are synchronized with the antenna switching, which steps through the three antennas in sequence, dwelling on each just long enough for one DFS to be performed. On any given antenna, the phases from its DFS's walk up in time, and are fit to a 2nd order polynomial curve using the least squares technique. The coefficients of the polynomial provide the phase for that antenna, the frequency of the signal, and the chirp (rate of change of frequency). Comparing the phases on each of the three interferometer antennas, the azimuth and elevation to the satellite can be computed. An interactive computer program was written to allow changing various parameters of interest.