Nonuniform linear antenna arrays for enhanced near field source localization

Abstract

Arrays of sensors freely located along an axis are considered in this paper that are used to localize a near-field emitting source. Using Taylor expansion and a suitable coordinate system, simple, yet rich to interpret, Cramer-Rao bounds relative to the direction and range parameters are derived. Our analysis allows in particular to unveil a family of non-uniform linear arrays with better near field estimation capabilities, compared to the well-established uniform linear arrays.

Study on Image Compression and Fusion Based on the Wavelet Transform Technology

“…The purpose of image compression is the original large image with less bytes and transmission, and required with good image recovery quality. The use of image compression, image can reduce the burden of storage and transmission; realize the fast transmission and real-time processing in the network image making [8,9]. Hierarchical wavelet tree proposed by Said and Pearlman (SPIHT) is a collection of segmentation algorithm using spatial tree hierarchical segmentation approach, effectively reduces the bit plane coding symbol set scale.…”

“…image compression, image can reduce the burden of storage and transmission; realize the fast transmission and real-time processing in the network image making [8,9].…”