The U.S. Army selected Northrop Grumman Corporation’s Highly Adaptable Multi-Mission Radar (HAMMR) to demonstrate its multi-mission capability at the 2017 counter-rocket, artillery and mortar (C-RAM) test at Yuma Proving Ground earlier this year.
HAMMR is a multi-mission sensor that provides the warfighter with situational awareness, counter-fire operations, air defense, early warning and airspace management capabilities. During this test, the system successfully detected and identified Groups I and II unmanned aerial systems, providing real-time situational awareness to the operator. HAMMR also validated its ability to connect to the Army’s Forward Area Air Defense command and control system, which enables the communication of information from the system back to the force.
HAMMR incorporates an Active Electronically Scanned Array (AESA) fighter radar mounted on a ground vehicle or towable trailer to provide continuous 360-degree protection against multiple ground and airborne targets – all while operating on-the-move so soldiers on the ground can maintain their operational pace without sacrificing protection. The modular self-contained system includes on-board prime power and cooling, AESA and radar electronics, and operator/maintainer display modules. These modules support multiple packaging concepts, making HAMMR easily adaptable to multiple vehicle types, fixed installations and C2 interfaces.
«HAMMR is the only AESA radar out there today that can support our maneuver forces’ on-the-move multi-mission operation», said Roshan Roeder, vice president, mission solutions, Northrop Grumman. «Since HAMMR shares common hardware with our fighter aircraft radars, our customers realize the cost advantages of high-volume AESA production and benefit from the inherent reliability of this mature, proven technology».
As drone technology gains greater public attention, along with its potential for hostile action against American targets, U.S. Army engineers adapt ongoing research to counter aerial systems that could threaten Soldiers.
At Picatinny Arsenal, the Extended Area Protection and Survivability Integrated Demonstration, or EAPS ID, began as an Army Technology Objective program. The goal was to develop and demonstrate technology that could support a gun-based solution to Counter Rockets, Artillery and Mortars, or C-RAM.
Research into enhanced C-RAM technology had the goal of extending the range and probability of success against the incoming threat.
«The smaller and smaller the protective area, the more efficient the gun systems become compared to missiles», said Manfredi Luciano, the project officer for the EAPS system. «You don’t need as many, and the gun system has certain logistics advantages».
As news reports about potential airborne threats to the White House have stirred public awareness of such threat to U.S. interests, ongoing technology aimed at countering rockets, artillery and mortars could be used to defend against Unmanned Aerial Systems, or UAS, Luciano said.
«It’s unbelievable how much it’s exploded», Luciano said about the use of drones. «Every country has them now, whether they are armed or not or what level of performance. This is a huge threat has been coming up on everybody. It has kind of almost sneaked up on people, and it’s almost more important than the Counter-RAM threat».
The UAS challenge has grown exponentially in the last decade as the world’s inventory of Unmanned Aircraft Systems (UAS) has grown from approximately 20 system types and 800 aircraft in 1999, to more than 200 system types and approximately 10,000 unmanned aircraft in 2010, said Nancy Elliott, a spokeswoman with the U.S. Army’s Fires Center of Excellence at Fort Sill, Oklahoma.
Although a missile-based C-RAM defense system has been selected as the technical approach for the Indirect Fire Protection Capability Increment 2 Intercept Program of Record, the gun alternative continued to mature as force-protection technologies for other potential applications. In response to proliferation, UAS threats were recently added to the project scope of gun-based force protection.
Luciano and his team, working on enhanced area protection and survivability, tested an integrated system April 22 by shooting down a class 2 Unmanned Aerial System using command guidance and command warhead detonation at Yuma Proving Ground, Arizona. Funding for development and testing was provided by the Armament Research, Development and Engineering Center (ARDEC) Technology Office.
The EAPS ARDEC gun alternative envisions a 50-mm cannon to launch command-guided interceptors. The system uses a precision tracking radar interferometer as a sensor, a fire control computer, and a radio frequency transmitter and receiver to launch the projectile into an engagement «basket».
«In order to minimize the electronics on board the interceptor and to make it cheaper, all the ‘smarts’ are basically done on the ground station», Luciano said. «The computations are done on the ground, and the radio frequency sends the information up to the round».
The Picatinny area-protection systems track both the incoming threat and interceptor, then compute an ideal trajectory correction for the interceptor to maximize probability of mission success. A thruster on the interceptor/projectile is used for course correction. The ground station uplinks the maneuver and detonation commands, while receiving downlinked assessment data.
The interceptor takes the commands and computes the roll orientation and time to execute thruster and warhead detonation. The warhead has a tantalum-tungsten alloy liner to form forward propelled penetrators for defeat of C-RAM targets, and steel body fragments to counter unmanned aerial systems.
The April 22, 2015, test was performed with a single shot Mann barrel. The UAS was flying a surveillance-type track and was engaged on the approach path leg. The airplane fell precipitously from its flight.
«The integrated test demonstrated a proof-of-principle that direct fire, command guided ammunition can intercept and negate aerial threats», Luciano said.
«Technologies from the EAPS gun alternative Army Technology Objective may potentially be used for both Army and Navy air defense systems», he added.
Luciano said that during another upcoming test, the engineers would try to intercept and destroy an unmanned aerial system under a more difficult engagement scenario.