Accession Number:

ADA535344

Title:

Three-dimensional FLASH Laser Radar Range Estimation via Blind Deconvolution

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT

Report Date:

2009-10-01

Pagination or Media Count:

30.0

Abstract:

Three dimensional 3D FLASH Laser Radar LADAR sensors are unique due to the ability to rapidly acquire a series of two dimensional remote scene data i.e. range images. Principal causes of 3D FLASH LADAR range estimation error include spatial blur, detector blurring, noise, timing jitter, and inter-sample targets. Unlike previous research, this paper accounts for pixel coupling by defining the range image mathematical model as a 2D convolution between the system spatial impulse response and the object target or remote scene at a particular point in time. Using this model, improved range estimation is possible by object restoration from the data observations. Object estimation is performed by deriving a blind deconvolution Generalized Expectation Maximization GEM algorithm with the range determined from the estimated object by a normalized correlation method. Theoretical derivations and simulation results are verified with experimental data of a bar target taken from a 3D FLASH LADAR system in a laboratory environment. Simulation examples show that the GEM improves range estimation over the unprocessed data and a Wiener filter method by 75 and 26 respectively. In the laboratory experiment, the GEM improves range estimation by 34 and 18 over the unprocessed data and Wiener filter method respectively.

Subject Categories:

  • Lasers and Masers
  • Numerical Mathematics
  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE