Theoretical Study of Non-Standard Imaging Concepts
Final technical rept. 15 Feb-15 Aug 1975
OPTICAL SCIENCES CO PLACENTIA CA
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This report is separated into two parts. Part I presents the analytic backup and computer code results of an effort to generate a fairly general computer code that would allow calculation of a variety of standard optical propagation effects. These effects are concerned with imaging resolution, heterodyne reception, laser transmitter antenna gain, scintillation, predetection compensation, etc. The computer program is written in Extended BASIC and can be run on a 16K memory size NOVA-type computer. Sample calculations are presented. Part II of the report is concerned with the subject of isoplanatism and its measurement. It is demonstrated that the isoplanatic patch size will, in general, not be the same for predetection compensation and for ordinary short-exposure imagery. The concept of angle-of-arrival isoplanatism is introduced and a simple integral expression relating the distribution of C sub N sq to angle-of-arrival isoplanatism is developed. The procedure for inverting a set of measurements of the angle-of-arrival isoplanatism function to obtain the distribution of C sub n square, and from that calculating the predetection compensation isoplanatism function is studied. Details of the procedure and formulation of its noise sensitivity are presented. Using sample angle-of-arrival isoplanatism measurements made against the edge of the sun, the predetection compensation isoplanatism function is evaluated as well as its rms uncertainty.
- Atmospheric Physics
- Computer Programming and Software