Design alternatives for Foliage Penetration SAR ultra wideband waveforms

Foliage Penetration SAR has achieved significant operational attention from both military and civilian applications. To achieve the spatial resolution desired, the waveform must occupy fractional bandwidths near 100 percent, and integration angles on the order of π/2. Both design objectives are classified as ultra-wideband, and require special constraints to allow operation in the crowded radio frequency spectrum. This effort examines the SAR waveform design approaches, given the recent advances in digital waveform synthesis, to satisfy frequency allocation constraints.