Research on Passive Troposcatter Location System

Abstract

Electromagnetic (EM) wave of enemy radar propagated by troposcatter can be utilized for beyond lineof-sight (b-LoS) location. To provide theoretical basis for passive troposcatter location system, channel characteristics including propagation loss, refraction effect and multipath fading are analyzed. Ray tracing method improved by tropospheric model is employed to describe the refraction effect. Correlation coefficient on the basis of transfer function is deduced to evaluate multipath fading. According to troposcatter characteristics, maximum operating range is estimated, cooperative energy detection is introduced to cope with the received signal without priori knowledge. The principle and accuracy of location algorithm based on azimuth are researched. Spatial smoothing is introduced under the situation that uncorrelated and coherent signals coexist. Through analyzing consequences, future directions are suggested.

A New Model for Estimating Troposcatter Loss and Delays Based on Ray-Tracing and Beam Splitting With ERA5

“…It has the characteristics of narrow beam, low propagation elevation angle, strong barrier crossing ability, high reliability, good resistance to nuclear explosion and interception, and so on. It can be applied to wireless communication [1]- [3], time synchronization [4], [5], and over-the-horizon detection and positioning [6], [7].…”