Accession Number : ADA311620
Title : High Resolution Computerized Ionospheric Tomography Systems.
Descriptive Note : Annual rept. (partial) 1 May-30 Sep 96,
Corporate Author : IOWA UNIV IOWA CITY
Personal Author(s) : Na, Helen
PDF Url : ADA311620
Report Date : 31 JUL 1996
Pagination or Media Count : 51
Abstract : Research during the period since 5/1/96 has focused on time frequency reconstruction and time varying imaging. The core of the space frequency algorithm, developed in year one, has been further refined. This algorithm has been tested on more robust sets of images and cases with simulated measurement noise. The results have been extremely positive. Future work will focus on making this core algorithm into a complete CIT algorithm. The other area of research has been in the development of the time varying algorithm. The goal was to develop an algorithm that combined model based imaging with smoothness constraints to enable imaging capable of detecting motion of the ionosphere during data acquisition. Work has focused on development of the Smoothness and Conjugate Gradient Method (SCG). This algorithm uses smoothness constraints for a relaxed fit to TEC data. Work is beginning on merging this algorithm with the Residual Correction Method, developed in year one. The result will be a three-dimensional (x,y,time) time varying algorithm.
Descriptors : *IONOSPHERIC DISTURBANCES, ALGORITHMS, SIMULATION, MEASUREMENT, NOISE, COMPUTERIZED TOMOGRAPHY, CORRECTIONS, GRADIENTS.
Subject Categories : Atmospheric Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE