At the 19th Integrated Communication, Navigation and Surveillance technologies (ICNS) Conference near Washington, DC, NASA presented the results of significant research recently conducted at the New York UAS Test Site at Griffiss International Airport, according to a press statement published today by the Northeast UAS Airspace Integration Research Alliance (NUAIR). NASA initiated the UAS integration in the national airspace system (UAS-NAS) project in 2011 as a five-year, USD150 million, project with a goal of contributing capabilities that would “reduce technical barriers related to the safety and operational challenges associated with enabling routine UAS access to the NAS.
In 2017 and 2018, with the first phase of the project complete, NASA sponsored the New York UAS Test Site and NUAIR Alliance in leading a year-long team research project at Griffiss International leading to a UAS technology flight demonstration in the summer of 2018.
The research demonstration, conducted under the NASA UAS Systems Integration and Operationalization (SIO) Project, included creation of a concept of operations, and development and demonstration of UAS technologies focused on an unmanned aircraft transiting from cruise through controlled airspace into a high-density urban airport terminal environment.
Griffiss was the terminal environment in which the test was conducted, under Syracuse Air Traffic Control (ATC) approach control and Griffiss control tower.
The purpose of the flight demonstration was to showcase technologies designed to minimize the impact of an interrupted control link between an unmanned aircraft and its ground control station. The technologies that were selected for demonstration were derived from a concept of operations and prototyped for this activity.
The concept of operations and demonstration emphasized the importance of communication with ATC if an unmanned aircraft in a lost-link scenario is required to modify its preplanned trajectory to avoid hazards such as weather.
This flight demonstration also served the purpose of raising ATC awareness and familiarity with UAS operations; particularly with lost-link operations.
Employing an Aurora Centaur optionally piloted aircraft (OPA), the project explored six scenarios aimed at advancing UAS integration under both nominal and off-nominal conditions.
Off-nominal conditions were defined to include complete loss of the communications link between the remote pilot’s control station on the ground and the aircraft. The off-nominal scenarios investigated included lost communication (broken link) between the pilot on the ground and the aircraft, with and without link recovery, an automated ATC voice-initiated go-around (landing wave-off), autonomous aircraft-initiated rerouting around a dynamic airspace obstruction (in this case simulated weather), and autonomous taxi operations to clear the runway.
For the demonstration, the Centaur OPA conducted six different demonstrations, including a nominal arrival scenario and the following five lost-link scenarios:
- the control link was lost and later reestablished,
- the control link was lost and not reestablished,
- the control-link was lost, and a go-around maneuver was required,
- the control link was lost, and a weather avoidance maneuver was required, and
- the control link was lost, and the aircraft was required to autonomously taxi off the runway.
NUAIR supported successful completion of the demonstrations. “Our findings presented at the conference indicated that additional development and testing are necessary before the prototype systems can be used in commercial systems.” According to NUAIR.
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