FSR Systems for Detection of Air Objects Using Cosmic Radio Emissions.

Hristo Kabakchiev,Ivan Garvanov,Hermann Rohling,Vera Behar,Avgust Kabakchiev,Dorina Kabakchieva

doi:10.3390/s21020465

Abstract

The paper analyses the possibility of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission from pulsars and planets (pulsar, Sun, Moon). A suboptimal multichannel algorithm for joint detection and evaluation of the parameters of the forward scattering signal created by an airplane (duration and velocity) is proposed, with preliminary compensation of the powerful direct signal emitted by cosmic sources (pulsar, Sun and Moon). The expressions for calculation of the Signal-to-Noise Ratio (SNR) at the input of the detector and the compensator are obtained. The detection characteristics are also obtained, and the requirements for the suppression coefficient of the compensator are evaluated. A methodology for calculating the maximum distance for detecting an aircraft using a described algorithm is proposed. The obtained results show that due to the Forward Scatter (FS) effect, there is the theoretical possibility to detect airplanes at close ranges by FSRs, which use very weak signals from cosmic sources.

Highlights

In the early 1950s, the United States entered into service the AN/SAN-25 passive radar, designed to determine the angular coordinates of extraterrestrial radio sources and used to navigate aircrafts and ships
We have calculated the values of Signal-to-Noise Ratio (SNR) for the direct (SNRdirect ) and the forward scattering signal from the aircraft (SNRdet ) depending on the distance to the aircraft ( R)
The article considers the problem of joint detection and estimation of the parameters of the forward scattering signal from an airplane with compensation of the direct signal from cosmic sources of radio emission for use in pulsar, solar and lunar

Summary

Introduction

In the early 1950s, the United States entered into service the AN/SAN-25 passive radar, designed to determine the angular coordinates of extraterrestrial radio sources and used to navigate aircrafts and ships. The first passive radars used radiation from the Sun and from the Moon. Attempts have been made to use the radio emission of pulsars in passive radars (for example, Cassiopeia) [1,2,3]. The main problem with the widespread use of passive radars was the creation of highly sensitive receivers to receive very weak signals from space. A number of variants of passive radars have been proposed, which use signals from various modern communications sources

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Conclusion