Performance analysis of a SAW based group demodulator for on-board processing communications satellites

A description is presented of the chirp Fourier transforms which can be implemented with surface acoustic wave (SAW) devices. Two configurations, the multiply convolve multiply (MCM) and convolve multiply convolve (CMC), are treated. The derivations show that one gives the Fourier transform precisely, the other is an approximation, although a good one under most circumstances. Numerical results for the CMC are given. The results show that windowing is an effective means of reducing the sidelobe level of the output transform but at the expense of widening the main lobe