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Over the past decade, aircrews have relied on infrared countermeasure (IRCM) and EW systems, such as the Large Aircraft Infrared Countermeasures system and the AN/APR-39 Radar Warning Receiver (RWR), to keep them safe during combat operations. These systems have been highly effective against current anti-aircraft weapons. Now, a more lethal generation of threats is beginning to appear on the horizon.

A digital battle for the EW domain is underway, with adversaries seeking to control the spectrum and deny access to airspace. Sophisticated and agile multi-spectral air defence weapons and airborne EW systems are coming online in conflict zones throughout the world, creating dense, highly-contested environments.

Staying ahead in this era calls for thinking beyond legacy technologies. Northrop Grumman and its customers have responded by investing in an advanced adaptive EW architecture. Fully digital and founded on secure, modular, open systems design principles, the ultra-wideband digital receiver/exciter at its core provides significant advantages over heritage systems. This technology allows for extended frequency coverage, full spatial coverage and more rapid responses. Featuring highly efficient broadband power amplifiers and adaptive countermeasure modulations, it is designed to detect, identify, locate and defeat next-generation sensors and weapons.  

Analog systems, including the legendary ALQ-135, served the warfighter well for decades, but there are limits to what we can accomplish with those technologies. Our digital, adaptive, open systems architecture provides a generational leap in capability […] We cannot afford to chase the threat. We must stay ahead of it,” observed Doug Goldberg, a Northrop Grumman engineer who was involved in design of the architecture and the new systems that are ultimately exploiting it. 

Sustainment costs for legacy, single-function systems can strain budgets. Obsolescence is an inevitable and sometimes costly concern. Digital architecture has changed the equation – EW suites can now perform multiple functions and support diverse mission sets; components and software can be shared among a family of systems. Under this building block approach, development costs and timelines decrease, upgrade cycles are faster and economies of scale kick in during production.

As new threats are identified, enhancements can be shared quickly throughout the product line. Often, only a software change is required to add new capabilities, minimizing obsolescence risk and decreasing the time to field. Another benefit lies in continued relevance for the 4th-generation fleet.

For the foreseeable future, we are going to have 4th- and 5th-generation fighters flying together,” said Ryan Tintner, VP Navigation, Targeting and Survivability. “To help our customers make the most of this mixed fleet, we are upgrading the electronic warfare suites of 4th-generation aircraft to give them capabilities that rival or exceed newer aircraft systems. Interoperability is key, and this mix of aircraft is already resulting in new concepts of operations.”

From large airlifters down to sUAS, the air operations picture has never before included such a diverse range of platforms. Large or small, protection for all, is the cry: protection from RF threats. The adaptive digital EW architecture makes it possible.

Northrop Grumman has been selected to provide its latest internal RF countermeasure capabilities for the AC-130J and MC-130J Radio Frequency Countermeasures program. This system is critical to keeping special operators safe in the face of sophisticated, next-generation RF threats. Protecting large platforms is no small feat, and with a wingspan of more than 100ft, these are some of the largest military aircraft flying today. The key to making it work is the common building block architecture. The system is also applicable to other large aircraft in service around the world.

"The scalable nature of our architecture allows us to configure it for aircraft of nearly any size or mission," explaied Tintner. "We can optimize it for anything from an airlifter down to a small helicopter or unmanned platform, podded or internal."

Another platform taking advantage of the common EW building block design is the F-16, for which the company is currently demonstrating an EW suite. This internal, digital RWR and countermeasure system uses an innovative ultra-wideband architecture to help keep the venerable F-16 effective for decades to come.

For aircraft where an internal system is not the preferred solution, Northrop Grumman's newly exportable ALQ-131C offers such protection in a pod. The original ALQ-131 remains one of the most-installed ECM systems ever fielded, with decades of proven operation to its credit. With the digital EW architecture as its foundation, this upgrade provides the power to operate in highly complex and contested electromagnetic spectrum environments.

On rotary wing aircraft, the AN/APR-39D(V)2 RWR and EW suite controller provides spherical protection and the ability to detect a greater range of modern threats than previous systems. The AN/APR-39E(V)2, the next generation currently in development, builds on these capabilities to detect modern, agile threats across a broader and wider spectral range. Both were built with a pathway to additional functionality and an ability to install on aircraft with greater space, weight, and power constraints. Planned integrations will impact thousands of aircraft worldwide.

Northrop Grumman is providing a generational leap in capability to keep warfighters safe as RF threats become more lethal and more widely proliferated. The need to maintain spectrum control and access to airspace is critical, and the company’s advanced, digital EW architecture is ready to meet the challenges ahead.

Northrop Grumman has been selected to provide RF countermeasures suite technology for both the MC-130J (pictured) and AC-130J aircraft. (Photo: USAF)

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