Range Compressed Holographic Aperture Ladar
Technical Report,01 Oct 2010,01 Feb 2017
AFRL/RYMM WPAFB United States
Pagination or Media Count:
Specific steps for 3-D holographic ladar are described so that phase gradient algorithms PGA can be applied to 3-D holographic ladar data for phase corrections across multiple temporal frequency samples. Substantial improvement of range compression is demonstrated in a laboratory experiment where our modified PGA technique is applied. Additionally, the PGA estimator is demonstrated to be efficient for this application and the maximum entropy saturation behavior of the estimator is analytically described. Simultaneous range-compression and aperture synthesis is experimentally demonstrated with a stepped linear frequency modulated waveform and holographic aperture ladar. The resultant 3D data has high resolution in the aperture synthesis dimension and is recorded using a conventional low bandwidth focal plane array. Individual cross-range field segments are coherently combined using data driven registration, while range-compression is performed without the benefit of a coherent waveform. Furthermore, a synergistically enhanced ability to discriminate image objects due to the coaction of range-compression and aperture synthesis is demonstrated.
- Active and Passive Radar Detection and Equipment