Indian Journal of Science and Technology

Abstract

Objective: This research reports the effect of turbulence on the dynamic Radar Cross Section (RCS) of chaff cloud. In the era of modern warfare technologies, most efficacious electronic countermeasure employed by the armed forces of various major powers is the Chaff. Chaff is based on the expulsion of numerous electrical dipoles of different length to cover the broad spectrum of radar frequency. This mechanism helps in deceiving the enemy missile by producing the required RCS. RCS of chaff cloud is a dynamic entity and rely on several aerodynamic factors. Methodology: Effects of turbulence on dynamic RCS are studied using Ansys Fluent for aerodynamic blooming simulation and Ansys HFSS for simulation of RCS of the bloomed chaff cloud. Findings: The subject of the paper corresponds to the significant effect of turbulence on the expeditious blooming of chaff cloud. The RCS of turbulent flow was higher by 1.5dBsm to 2.5dBsm for 50msec. The turbulence effect has reduced the blooming time of chaff filaments in the range of 25msec - 50msec. Novelty: Turbulence plays important role in faster blooming of chaff cloud and achieving minimum threshold RCS required for deception of RF seeker missiles.

Keywords: Chaff; RCS; Turbulence; Modelling and Simulation