Abstract
This article analyzes the use of Remotely Piloted Aircrafts (RPA) in VOR (Very High Frequency Omnidirectional Range) flight inspection. Initially, tests were performed to check whether the Autopilot Positioning System (APS) met the regulatory requirements. The results of these tests indicated that the APS provided information within the standard regulations. A Hardware in the Loop (HIL) platform was implemented to perform flight tests following the waypoints generated by a mission automation routine. One test was performed without introducing disturbance into the proposed test platform. The other four tests were performed introducing errors in latitude and longitude in the APS into the platform. The errors introduced had the same characteristics as those measured in the initial tests, in order for the simulation tests to be as similar as possible to the real situation. The tests performed with positioning errors only did not lead to false misalignment detection. However, introducing positioning errors and a 4° VOR misalignment error, a misalignment of 3.99° was observed during the flight test. This is a value greater than the maximum one allowed by the regulations, and the system indicates the VOR misalignment. Five flight inspection tests were performed. In addition to the APS errors, tests with a modulation error were also conducted. Introducing a 4° VOR misalignment in conjunction with modulation error, a misalignment of 4.02° was observed, resulting in successful misalignment detection.
Highlights
Radio Navigation Aids (NavAids) provide electronic guidance for aircraft, helping their navigation in poor visual conditions, which improves aviation safety in the context of the ever-increasing demand for air traffic [1,2]
There are two components encapsulated in _VOR: vor, a constant value, which shifts the value of the radial read from the Data Logger; and a modulation error, as specified by International Civil Organization (ICAO)
The results show that the Autopilot Positioning System (APS) used can provide the position information to the VOR inspection identifying the cases in which the VOR station was misaligned
Summary
Radio Navigation Aids (NavAids) provide electronic guidance for aircraft, helping their navigation in poor visual conditions, which improves aviation safety in the context of the ever-increasing demand for air traffic [1,2]. NavAids must pass periodical inspections known as flight inspections to ensure their calibration and air system safety. Due to the periodic repetition and the high cost of the flight mission inspection [4], the interest in alternatives for performing these inspections has arisen. VOR (Very High Frequency Omnidirectional Range) is one of the most common types of NavAid used in commercial aviation, and its inspection requires the displacement of a well-equipped aircraft to the corresponding airport. The improvement of the technological resources and the popularization of Remotely Piloted
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