Military destroys own Global Hawk with stray test signal
By Marcus Boone ·
Anyone in enemy territory is tracked with 20-meter precision by a system that was once brought down by a stray flight termination signal from its own side.
At 60,000 feet, the world ceases to be a collection of borders and becomes a series of data points. From that height, the Northrop Grumman RQ-4 Global Hawk—initially known as Tier II+ during its development—does not merely fly; it loiters. It is designed for what the record calls "operationally persistent dwell," a sterile phrase for the act of staring at a target for twenty-four hours straight without blinking.
A program page mirrored by the FAS Intelligence Resource Program describes the aircraft as an Advanced Concept Technology Demonstration designed to give the Joint Force commander a broad, systematic overview of the earth below. According to the public record, the RQ-4 utilizes high-resolution synthetic aperture radar (SAR) and electro-optical/infrared (EO/IR) sensors to achieve this. But the internal logic of the program, as captured in the FAS file, is focused on the eradication of blind spots.
"Anywhere within enemy territory"
The mission of the Global Hawk was defined by MGen Kenneth Israel, Director of the Defense Airborne Reconnaissance Office (DARO). To Israel, extended reconnaissance meant "the ability to supply responsive and sustained data from anywhere within enemy territory, day or night, regardless of weather, as the needs of the warfighter dictate."
That definition removes the variable of geography. When the state decides where "enemy territory" begins, the Global Hawk ensures that nowhere within that zone remains private. The technical specifications listed in the file are a testament to this ambition. The aircraft can operate at ranges up to 3,000 nautical miles from its launch area. Once it arrives, it can cover 40,000 square nautical miles per mission at a one-meter resolution. If a specific target requires more scrutiny, the system can produce up to 1,900 spot images per mission at a resolution of 0.3 meters.
This is not just observation; it is the preparation for violence. The record notes that the system supports a targeting accuracy of at least 20m CEP (Circular Error Probable). The data does not sit in a vacuum. It is fed into the Joint Deployable Intelligence Support System (JDISS) and the Global Command and Control System (GCCS), allowing imagery to be transferred in near real time to operational commanders for "immediate use." Within minutes of receipt, the data is available for "rapid strike/restrike tasking" and "combat assessment."
Document imagery from irp.fas.org From the files: irp.fas.org
0.3m resolution
The precision of the gaze is matched by the flexibility of the sensor suite. The Global Hawk carries its radar and EO/IR payloads simultaneously, allowing it to pivot between wide-area searches and pinpoint tracking. The SAR radar is capable of multiple modes: a strip mode at one meter and a spot mode at a single foot. In Ground Moving Target Indicator (GMTI) mode, it can track objects moving as slowly as four knots from a range of 20 to 200 kilometers.
This capacity for "continuous spot coverage" ensures that "critical mobile targets" cannot simply drive out of sight. The infrastructure required to process this flood of imagery is equally sprawling. Depending on which military branch is leading the operation, the data is routed through different processors: the Enhanced Tactical Radar Correlator (ETRAC) and Modernized Imagery Exploitation System (MIES) for Army commanders, the Contingency Airborne Reconnaissance System (CARS) for the Air Force, or the Joint Services Imagery Processing System-Navy (JSIPS-N) for the Navy and Marines. Regardless of the pipeline, the imagery ends up on the Common Ground Station (CGS).
Document imagery from irp.fas.org From the files: irp.fas.org
A test signal for flight termination
For all its high-altitude sophistication, the system has been prone to the kind of terrestrial errors that defy its image of omnipotence. The FAS record notes that in March 1999, a Global Hawk vehicle and its sensors went out of control and were destroyed. The crash delayed the military utility study by at least two months.
The reason for the disaster was not a failure of the aircraft's engines or a strike by an enemy. An accident investigation board, whose results were released by the Aeronautical Systems Center Public Affairs on December 23, 1999, found that the Global Hawk "inadvertently received a test signal for flight termination from a test range on Nellis Air Force Base." The machine, designed to watch the world with absolute precision, was brought down by a stray signal from its own side.
Document imagery from irp.fas.org From the files: irp.fas.org
Australia and the Stage 2 agreement
Failure did not slow the expansion of the program. By March 1999, the program was already expanding its reach "down under." A $20 million government-to-government, cost-sharing arrangement between the United States and Australia was signed to cooperatively develop and demonstrate the drone's reconnaissance assets. The FAS file notes that the Global Hawk was scheduled to deploy to Australia in April 2001 as part of this "Stage 2" effort.
As the program moved from demonstration to formal acquisition, the financial stakes climbed. On February 16, 2000, Northrop Grumman Corp. was awarded a modification to a cost-plus-award-fee contract (MDA972-95-3-0013) totaling $71,999,635. This funding was earmarked for two prototype vehicles, system modifications, and engineering support, with an expected completion date of March 31, 2002.