3-D holographic ladar uses digital holography with frequency diversity to add the ability to resolve targets in range. A key challenge is that since individual frequency samples are not recorded simultaneously, differential phase aberrations may exist between them making it difficult to achieve range compression. We describe steps specific to this modality 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 with 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.
Copyright © 2016 Optical Society of America
Optical Society of America
Digital holography, Remote sensing and sensors, Lidar, Optical sensingand sensors, Synthetic aperture radar, Three-dimensional image processing
Stafford, Jason W.; Duncan, Bradley D.; and Rabb, David J., "Phase Gradient Algorithm Method for 3-D Holographic Ladar Imaging" (2016). Electro-Optics and Photonics Faculty Publications. 41.