Accession Number : AD0690837

Title :   IMAGING OF OBJECTS VIEWED THROUGH A TURBULENT ATMOSPHERE.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Moldon,John C.

Report Date : 03 MAR 1969

Pagination or Media Count : 116

Abstract : This report is concerned with estimating the high-resolution amplitude and phase parameters of the spatial Fourier transform of an object illuminated with incoherent radiation and viewed through a turbulent atmosphere. The Cramer-Rao technique is employed to lower-bound the variance of any unbiased estimator, and receiver structures that approach these bounds are then exhibited. It is found that significant improvement over many existing systems is often possible, provided one is willing to pay for increased system complexity. The reduction of the processors to somewhat less efficient but more practically attractive forms is then considered. Some experimental results are presented which illustrate the effects of turbulence on wave-front coherence. (Author)

Descriptors :   (*OPTICAL IMAGES, IONOSPHERIC PROPAGATION), LIGHT TRANSMISSION, PATTERN RECOGNITION, TRANSFER FUNCTIONS, ASTRONOMY, THESES

Subject Categories : Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE