A mathematical model for describing the operation of airborne gun-laying radars in conditions of active counteraction to enemy interference and military-economic assessment of the feasibility of its implementation

The combat capabilities of modern means of warfare in the air largely depend on the reliable operation of on-board electronic means (OEM) and weapon control systems of fighter aircraft. Therefore, in the course of military operations, each of the warring parties seeks to disorganise the operation of the enemy's radio-electronic systems and weapon controls as much as possible and ensure the stable operation of their own OEM by all means. This task is assigned to the means of electronic warfare (EW). During air combat, this task is assigned to the aircraft jamming station, whose place and role in modern air combat is constantly growing. The efficiency of the operation of this system is directly related to the aircraft survivability during a combat mission. This study considers the developed approach to the output of initial data on modelling the operation of airborne radars in conditions of interference and simultaneous active counteraction to enemy interference stations. The authors in this study have suggested a mathematical description of the air combat situation, which occurs when using methods of active countermeasures to enemy airborne interference systems by changing the parameters of the operation of the airborne gun-laying radar (AGLR). Indicators and criteria that characterise the effectiveness of the operation of airborne radars, depending on the method of counteraction used, were proposed, including a sequence of possible applications of the known four methods of counteraction, taking into account the features of their application.

Evaluation of unmanned aerial vehicle tactics through the metrics of survivability

Aircraft survivability is a classical consideration of combat aircraft design and tactical development, but the fundamental model of aircraft survivability must be updated to be able to consider modern tactical scenarios that are applicable to unmanned aircraft. This paper seeks therefore to define the set of design tradeoffs and an evaluation of the tactical effectiveness for unmanned aircraft survivability. Traditional and modern survivability evaluation methods are presented and integrated into a computational simulation to create a probabilistic evaluation of unmanned aircraft survivability. The results demonstrate the development of design tradeoffs for a hypothetical unmanned C-130J Hercules against a single man-portable air defense system. The discussion focuses on the demonstration of the utility of this survivability evaluation framework for consideration of survivability in unmanned aerial vehicle (UAV) design, the utility of considering survivability in the design of multi-UAV configurations (including the loyal wingman and swarms), and the value of the probabilistic survivability model for multi-aircraft simulations.

Nozzle dimension design for aircraft engine infrared signature and thrust active control using MOEA/D

Aircraft infrared signature is one of the most important properties for the military aircraft survivability. In terms of military aircraft, the exhaust system is the most significant infrared radiation source. The exhaust system accounts for more than 90% of the aircraft infrared radiation, and that the exhaust nozzle contributes the most significant infrared radiation of the whole radiation energy provided by the exhaust system from the rear aspect. Low detectionable feature for military aircraft has attracted more importance to promote aircraft survivability via reducing infrared signature. The alteration of nozzle exit area affects an aircraft engine performance; meanwhile, it severely influences the engine infrared signature radiation from the rear side. The present paper is mainly focused on searching an appropriate group of nozzle exit diameter and throat to exit diameter ratio, which can reduce infrared signature radiation while cutting down the loss of thrust. Hence, objectives involve two aspects: one is minimum infrared signature level, and the other is minimum thrust loss. The multi-objective evolutionary algorithm based on decomposition has been employed to solve this bi-objective optimization problem. The optimization results illustrate that dimension selection range and throat to exit diameter ratio exert more important effect on the thrust loss and infrared signature level. Furthermore, the thrust plays significant role for deciding nozzle exit diameter and throat diameter.

Method for assessing combat survivability for aircraft with wing damage

In the combat environment, wing damage is of particular concern since the wing is the main component to generate lift which affects survivability or safety. Previous research has been mainly concentrated on the aerodynamic behavior of the aircraft with wing damage. However, the military analysts are more concerned about the specific value of survivability (measured by survival probability) so as to correctly plan combat operations. This paper proposes a method for quantitatively describing the relationship of aircraft survivability and damage holes with different sizes and different locations on the wing. Examples show that the survivability decreases with increasing hole size; the magnitude of survivability decrement reduces when moving the damage backwards or moving the damage toward the wing tip; when the effect of damage on the vulnerability is considered for different hole sizes, the survivability is reduced more significantly compared with the cases where the vulnerability is kept constant for all scenarios.