Analysis of Settling and RCS Response of Copper Coated Carbon and its Comparison with Aluminium Fibres

Vivek Bajpai,Alok Basita,Kavita Chouhan,Ravindra Kumar,Verandra Kumar,Prashant Vasistha

doi:10.17485/ijst/v15i2.2138

Abstract

Background/Objectives: The present research focuses on comparative studies of two different type of chaff fibres for their effectiveness as electronics counter measure. Chaffs are electronic counter measures used in creating false radar signature to deceive tracking radar systems. Many types of chaff payloads are there in use, but the major one is aluminium fibres. These chaffs are designed to cover radar frequency range from 2-18 GHz. However, in future, tracking radars will operate in higher frequency range and will have improved algorithms to mitigate chaff noise of certain Radar Cross Section (RCS) threshold. Methods: The researcher used two different chaff fibres and their corresponding RCS are measured in anechoic chamber for their comparative study. Findings: It is observed that the RCS of the copper coated carbon (CuC) fiber is nearly equal to that of aluminium fiber but due their thinner diameter packing density of chaff fibres within a specified chaff cartridge volume has increased thus resulting in more number of dipole per chaff payload. Larger number of dipoles will help in improving dynamic RCS of chaff payload as it is directly proportional to the number of dipoles. Moreover, the terminal velocity of copper coated carbon fibres is lesser than that of aluminium fibres has improved the persistent time for CuCfiberwhich is a desirable parameter for the effective performance of chaff payload. Novelty: In order to increase dynamic RCS threshold one needs to increase chaff fiber density and chaff cloud suspension time. Both these can be achieved by the development of innovative thin CuCchaff fibres. In this paper, RCS of light weight and thin copper coated carbon chaff fibres were studied in comparison with traditional aluminium fibres and their advantages over aluminium fibres are reported. Keywords: Backscattered RCS; electrically conducting fiber; anechoic chamber; chaff; Settling Time

Highlights

In today’s war scenario, chaff plays an important role as an electronic counter measure to deceive tracking radar systems[1,2]
Backscattered Radar Cross Section (RCS) of chaff cloud is directly proportional to the number of the chaff dipole elements present in the chaff payload
The number of dipole in a given volume of chaff cartridge will be more resulting in higher RCS for CuC fibres than that of aluminium fibres

Summary

Introduction

In today’s war scenario, chaff plays an important role as an electronic counter measure to deceive tracking radar systems[1,2]. Various radars operate mainly in GHz frequency range thereby making the size of chaff dipoles, which is half of the operating wavelength, in centimetre range. Radars will operate in high frequency range, thereby forcing to use shorter dipole lengths to attain minimum Radar Cross Section (RCS) to deceive and jam the tracking radars. With decrease in dipole length, it will require increase packing density of chaff dipoles to achieve the minimum required RCS. To achieve this higher packing density, the thickness of the chaff dipole needs to be thinner[4,5]

Objectives

Results

Conclusion