Numerical simulations and experimental measurements were combined to determine the ability of a PIP to measure plasma density and electron collision frequency in a plasma containing spatial gradients as well as time-varying oscillations in the plasma density. Collision frequency was to be measured by the width of the parallel resonance in the real part of plasma impedance-vs.-frequency, while p...

A theory of edge detection is presented. The analysis proceeds in two parts. (1) Intensity changes, which occur in a natural image over a wide range of scales, are detected separately at different scales. An appropriate filter for this purpose a t a given scale is found to be the second derivative of a Gaussian, and it is shown that, provided some simple conditions are satisfied, these primary ...

A theory of edge detection is presented. The analysis proceeds in two parts. (1) Intensity changes, which occur in a natural image over a wide range of scales, are detected separately at different scales. An appropriate filter for this purpose at a given scale is found to be the second derivative of a Gaussian, and it is shown that, provided some simple conditions are satisfied, these primary f...

Direction finding systems applying phase interferometer of long baseline gives high accuracy the angle arrival measurements; however, they are suffering from ambiguity and error due to antenna spacing greater than half wavelength intercepted signals. In this paper, simple two-antenna system has been adopted with zero-crossing technique used solve measurement ambiguities in processing unit. The ...