In the realm of maritime defence, the battle against Unmanned Aerial Vehicles (UAVs) or drones is a critical yet complex challenge. This article delves into the intricacies of anti-drone warfare (ADW) at sea, focusing on the technology choices that make or break the kill chain. The author, Mr. Hasan Özyurt, a seasoned naval expert, takes us on a journey through the various components of this intricate system, offering a unique perspective on why certain technologies are chosen over others.
One of the key takeaways is the importance of forward deployment. When the threat originates from the sea, defence cannot be confined to the shoreline. This means that the battle against drones must take place along the threat axis itself, requiring a proactive approach. The three-tier framework – Tier 1 Counter-UAS, Tier 2 ADW, and Tier 3 Anti-Air Warfare – is introduced as a means to address the evolving nature of drone threats. Each tier has its own set of requirements and challenges, and the author emphasizes the need for a layered defence system.
The kill chain problem is a central theme, highlighting the need for a seamless and rapid process. Detection, identification, tracking, and hard-kill engagement must all occur within a compressed time window. The author argues that the failure of any single link in this chain can result in a 'leaker', a drone that escapes detection and engagement, potentially causing significant damage. This is where technology selection becomes crucial, as each component must be carefully matched to the platform's constraints, cost boundaries, and engagement timelines.
In the realm of detection and tracking, compact Active Electronically Scanned Array (AESA) radar emerges as a game-changer. Designed specifically for the counter-UAS mission, it can detect and track targets with an RCS as low as 0.01 m², within the SWaP envelope of small-to-medium Unmanned Surface Vessels (USVs). This radar provides 360° coverage, tracks multiple targets simultaneously, and performs well in adverse weather conditions, making it the primary sensor for Tier 2 ADW detection. The author notes that passive systems, such as RF direction-finding and acoustic sensors, have limitations and are relegated to Tier 1 or secondary roles.
The Electro-Optic System (EOS) plays a pivotal role in identification and fire control. It must acquire targets visually, provide high-resolution data, and deliver continuous fire control. The author emphasizes the need for a multi-spectral EOS architecture, combining daylight, thermal, and SWIR channels, to ensure reliable performance across varying sea states and environmental conditions. The choice between a high-end integrated suite and a mid-tier compact director depends on the effector carried, with considerations for stability, precision, and reliability.
The effector landscape is a complex one, with various options ranging from advanced surface-to-air missiles to electronic warfare and directed energy weapons. The author critically evaluates each option, highlighting their strengths and weaknesses in the context of small unmanned platforms. Advanced surface-to-air missiles, for instance, are economically unsustainable against mass campaigns, while gun-based systems face physical constraints in terms of weight, range, and power requirements. Electronic warfare, while effective against Tier 1 drones, is largely ineffective against autonomous Tier 2 OWA drones.
The optimal effector choice, according to the author, is precision-guided light missiles in the SAL and IR/IIR categories. These missiles offer high kill probability, fast reaction, and sustainable cost-exchange, while being proven compatible with USVs. The author argues that the combination of SAL and IR/IIR missiles on a common launcher addresses the tactical gaps of either system alone, providing a more comprehensive solution. This pairing ensures economic sustainability, operational maturity, and proven performance on unmanned hulls.
In conclusion, the author emphasizes that the success of anti-drone warfare at sea hinges on the careful matching of sensors and effectors to the physical and economic realities of the Tier 2 OWA drone threat. The choice of technology is not merely about individual components but about assembling a coherent and effective kill chain. The insights offered in this article provide a valuable perspective on the challenges and considerations involved in this critical aspect of maritime defence.
