An Iterative Technique for Designing Finite Impulse Response Chebyshev MTI Filters with Nonlinear Delay
COMMUNICATIONS RESEARCH CENTRE OTTAWA (ONTARIO)
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A technique for designing finite-impulse-response FIR equiripple high-pass digital filters with nonlinear phase, suitable for use in radar moving-target-indication MTI systems, is described. The optimization of such filters in both the time and frequency domains is discussed, and comparisons are made between the spectral performance of nonlinear-phase filters and that of linear-phase filters designed to meet the same stopband bandwidth and attenuation specifications. In 92 out of the 94 cases examined, the transition bandwidth between the stopband is narrower for the nonlinear-phase filter. In the MTI application, this characteristic makes it possible to detect targets of lower radial velocity. Listings of Fortran programs for designing these nonlinear-phase filters are included.
- Computer Programming and Software
- Active and Passive Radar Detection and Equipment