Angular stepped frequency target detection technique

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