As part of Local Conversion and Implementation Plan which is based on the EUROCONTROL Revised Convention the Republic of Croatia has undertaken to make a plan of implementing the Basic Continuous
Receiver Autonomous Integrity Monitoring (RAIM) is a method, used by an aircraft's receiver, for detecting and isolating faulty satellites of the Global Navigation Satellite System (GNSS). In order for a receiver to be able to detect and isolate a faulty satellite using a RAIM algorithm, a couple of conditions must be met: a minimum number of satellites, and an adequate satellite geometry. Due to the highly predictable orbits of the GPS satellites, a RAIM availability prediction can be done easily. A number of RAIM methods exist; however, none of them takes into account the precise terrain masking of the satellites for the specific location. They consider a uniform fixed mask angle over the whole horizon. This paper will introduce the variable mask RAIM algorithm in order to show to what extent the terrain can affect the RAIM availability and how much it differs from the conventional algorithms. K E Y
Previous studies have shown that the impact of interior aircraft noise on pilot performance was not unambiguous, neither there was any unanimous methodology used for measuring it. Furthermore, the cumulative character of noise was never taken into account. This research proposes a methodology that aims to determine the impact of INTRODUCTIONEvery day's flight tasks performed by pilots require concentration, analytical illation, precise movements, continuous performance, and long-term attention. Such tasks are particularly expressed in the process of flight training since automatic flight control systems on the general aviation aircraft during basic flight training are not in use. The effectiveness of the pilot in performing tasks significantly affects flight efficiency and safety. At the same time, pilot performance is affected by the environmental factors in the cockpit with noise being the most significant one.Human factors in aviation were gradually developed and institutionalized by the end of the 1970s. They denote a term that describes various pilot performance aspects interacting with environmental factors in the aircraft cockpit, while pilot performance means aircraft guidance along with navigation and communication management. The error, which is defined as the action -or lack of action -and which leads pilots to deviate from the institutional or the pilot's intentions or expectations, is important performance viewpoint in aviation. The quality of pilot work has certain significance, not only as the effectiveness, but also as for outcomes such as efficiency and flight safety [1]. McFadden in [2] elaborates on the causes of pilot errors and safety threats in aviation, but does not include the impact of all the working environment factors in the aircraft cockpit. These factors are humidity, temperature, pressure, vibration, and, above all, the noise. Noise impact on pilots requires a sufficient level of noise etiology knowledge in order to reduce the potential negative impact on the efficiency and flight safety through adequate noise reduction procedures. This requirement is more pronounced in cases with a high degree of interaction between the pilot and the aircraft which is particularly distinctive in general aviation aircraft during basic flight training where there is no auto-pilot system in use. Research conducted on the Croatian national carrier pilots showed that flight safety was at least once disturbed by noise in 27.8% and 38.5% of turbofan and turboprop aircraft pilots, respectively [3]. The results were achieved by polling without putting the emphasis on actual effect of noise on pilot performance.The effects of exposure to noise can be physiological and psychological. The physiological effects can be auditory or non-auditory (extra-auditory or JURICA IVOŠEVIĆ, Ph.D. 1
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