EASA ATPL062 radio-navigation foundations flashcards
EASA ATPL062 radio-navigation foundations · Build recall with a focused review session.
20 cards. Read the term and the definition here. The deck at the top of this page is optional.
- VOR radial
- A direction extending from a VOR station in its declared reference system, distinguished from the aircraft’s heading or a selected inbound course.
- Relative bearing
- A direction measured relative to the aircraft’s nose on the specified instrument, requiring the heading reference for conversion to an absolute bearing.
- QDM
- A magnetic bearing to a station in the relevant radiotelephony/navigation context, distinguished from the reciprocal bearing from that station.
- DME slant range
- The direct spatial distance between aircraft and facility, including vertical separation rather than only horizontal distance across the ground.
- Localizer
- The lateral-guidance component of an ILS, whose displayed deviation and published use must be distinguished from the separate glide-path signal.
- Glide path
- Vertical approach guidance from the specified system, distinguished from a universal permission to descend whenever any similar indication appears.
- Scalloping
- Rapid fluctuation of a received bearing indication associated with reflected-signal effects, requiring distinction from an actual commanded turn or steadily changing track.
- Pseudorange
- An apparent satellite range measurement containing clock-related and other error components, not yet the final corrected geometric aircraft-to-satellite distance.
- Dilution of precision
- A measure of how satellite geometry affects position-solution sensitivity, rather than a guarantee that every signal error is absent.
- RAIM
- Receiver Autonomous Integrity Monitoring, whose available function depends on measurements, geometry, algorithm and applicable aiding rather than merely displaying coordinates.
- Fault detection and exclusion
- The capability to identify and remove an unacceptable input while maintaining the required solution, distinguished from detecting a fault alone.
- SBAS
- A satellite-based augmentation system providing its defined corrections and integrity information, distinguished from a conventional ground localizer or an aircraft-only algorithm.
- GBAS
- A ground-based augmentation system using local reference information and the defined broadcast service, distinguished from a worldwide satellite-constellation name.
- RNP
- Required Navigation Performance in the PBN framework, including onboard performance monitoring and alerting requirements in addition to the specified navigation performance.
- Wavelength
- The spatial length of one cycle of a wave, calculated from propagation speed divided by frequency in the stated physical model.
- Primary radar
- A surveillance method using reflected transmitted energy to detect targets, distinguished from requiring each aircraft to send a transponder reply.
- Secondary radar
- A surveillance method involving airborne transponder replies to interrogations, with information depending on the actual mode and installation.
- Mode S
- A selective-addressing transponder capability with defined data functions, whose name alone does not establish every position-source or altitude-resolution property.
- Attenuation
- Reduction in signal strength through the propagation path, which can hide targets behind heavy precipitation rather than establish clear air.
- Unambiguous range
- The range over which a simple pulse-timing system can associate an echo with its transmitting pulse under the stated repetition model.