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Koga T.,Japanese Electronic Navigation Research Institute
Proceedings - 2011 10th International Symposium on Autonomous Decentralized Systems, ISADS 2011 | Year: 2011

Aircraft is one of the most dynamic and fast transportation systems. Aircraft is flying at the speed of hundreds km/h and moving in three dimensional space without stopping. Therefore, in air traffic, the situation is dynamically changing from moment to moment, from position to position. Under this dynamic changing situation, air traffic control radar systems are required to monitor aircraft with high safety. Secondary Surveillance Radar (SSR) has been accomplishing this difficult work for a long time. As the number of aircraft with new capability increases, SSR is suffering from data traffic congestions between aircraft and SSR Ground Station(GS). In this paper, we propose the Autonomous Continuous Target Tracking Technology. This technology reduces data traffic in air-ground communication with keeping continuous target tracking. Source


Mori R.,Japanese Electronic Navigation Research Institute
Mathematical Problems in Engineering | Year: 2015

Airport congestion, in particular congestion of departure aircraft, has already been discussed by other researches. Most solutions, though, fail to account for uncertainties. Since it is difficult to remove uncertainties of the operations in the real world, a strategy should be developed assuming such uncertainties exist. Therefore, this research develops a fast-time stochastic simulation model used to validate various methods in order to decrease airport congestion level under existing uncertainties. The surface movement data is analyzed first, and the uncertainty level is obtained. Next, based on the result of data analysis, the stochastic simulation model is developed. The model is validated statistically and the characteristics of airport operation under existing uncertainties are investigated. © 2015 Ryota Mori. Source


Abadi P.,Indonesian Institute of Sciences | Abadi P.,Bandung Institute of Technology | Saito S.,Japanese Electronic Navigation Research Institute | Srigutomo W.,Bandung Institute of Technology
Annales Geophysicae | Year: 2014

We investigated low-latitude ionospheric scintillation in Indonesia using two GPS receivers installed at Bandung (107.6 E, 6.9 S; magnetic latitude 17.5 S) and Pontianak (109.3 E, 0.02 S; magnetic latitude 8.9 S). This study aimed to characterise climatological and directional ionospheric scintillation occurrences, which are useful not only for the physics of ionospheric irregularities but also for practical use in GNSS (global navigation satellite system)-based navigation. We used the deployed instrument's amplitude scintillation (S4 index) data from 2009, 2010, and 2011; the yearly SSN (sunspot-smoothed numbers) were 3.1, 16.5, and 55.9, respectively. In summary, (1) scintillation occurrences in the post-sunset period (18:00-01:00 LT) during equinox months (plasma bubble season) at the two sites can be ascribed to the plasma bubble; (2) using directional analyses of the two sites, we found that the distribution of scintillation occurrences is generally concentrated between the two sites, indicating the average location of the EIA (equatorial ionisation anomaly) crest; (3) scintillation occurrence enhancements for the two sites in field-aligned directions are herein reported for the first time by ground-based observation in a low-latitude region; (4) distribution of scintillation occurrences at Pontianak are concentrated in the southern sky, especially in the southwest direction, which is very likely associated with the plasma bubble tilted westward with increasing latitude; and (5) scintillation occurrence in the post-midnight period in the non-plasma-bubble season is the most intriguing variable occurring between the two sites (i.e. post-midnight scintillations are observed more at Bandung than Pontianak). Most of the post-midnight scintillations observed at Bandung are concentrated in the northern sky, with low elevation angles. This might be due to the amplitude of irregularities in certain directions, which may be effectively enhanced by background density enhancement by the EIA and because satellite-receiver paths are longer in the EIA crest region and in a field-aligned direction. © 2014 Author(s). Source


Mori R.,Japanese Electronic Navigation Research Institute
Proceedings - 2015 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2015 | Year: 2015

This paper proposes a new pilot control model which reflects the three characteristics of the pilot control behavior: stochastic, periodical, and discrete movement. The focus is on the final descent phase when the pilot controls the aircraft manually based on the flight director commands. The proposed model is developed based on an existing model as well as highly experienced pilot's comments. A flight simulator experiment is conducted and the parameters are tuned by the obtained data. The simulation result shows that the proposed model captures well the characteristics of the data obtained in the simulator experiment and shows a good accordance with actual command tracking capability. © 2015 IEEE. Source


Mori R.,Japanese Electronic Navigation Research Institute
Journal of Navigation | Year: 2014

Currently, the 30 nautical mile (nm) minimum longitudinal separation standard is applied on oceanic routes under the Automatic Dependent Surveillance-Contract (ADS-C) environment. However, the periodic position report should be provided at least every ten minutes in Japanese airspace based on previous safety analysis. The position report is usually sent via satellite connection, so less frequent position reports would reduce connection costs by airlines. Since the previous safety analysis estimates the risk of collision conservatively, this paper proposes a refinement of the collision risk model by considering the dependency between two closely separated aircraft. The result shows that the periodic position report interval can be extended without infringing safety. © 2014 The Royal Institute of Navigation. Source

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