Angular stepped frequency target detection technique

Abstract

This paper presents an approach to target detection using discrete Fourier transform (DFT) processing and a stepped frequency waveform. The approach utilizes an advanced mathematical two-way signal model to separate the non-linearity associated with the target returns. This model is based on a three dimensional third-order Taylor series expansion of the round trip delay about incremental azimuth, elevation and time. Once a range bin is established, proper time sampling removes the signal's time dependency. Thus, the two-way phase is proportional to azimuth and elevation increments. Detection is achieved on the basis of target's range, azimuth and elevation angels. Elevation (vertical strip) and azimuth (horizontal strip) profiles of the target's plane are synthesized through a two-dimensional DFT.