Applications of Collision and TCAS Alerting Models in Parallel Runways Operations

Tong, Kwok-On; Conway, Sheila; Ulrey, Michael L.

doi:10.2514/6.2010-9334

“…They introduced the uncertainty of the flight into the collision model [8] which effectively improved the flight safety. Kwok-On Tong made the in-depth study [9] on the parallel approaching of TCAS. Selim Temizery [10], Evan Maki [11], Hyunjin Choi [12], Lin, C.E.…”

Section: Introductionmentioning

confidence: 99%

Alerting Threshold Analysis of TCAS

Tuo¹,

Zhang²

2015

TOAUTOCJ

0

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A method for the setting and evaluation of TCAS (Traffic Alert and Collision Avoidance System) alerting threshold is proposed in this paper. Firstly, by analyzing the error and uncertainty of the flight path, a stochastic differential equation is introduced to model the random aircraft motion. Then a pilot model according to ICAO standards is given to simulate the TCAS alert event. And then five kinds of alarm outputs are summed up by analyzing the principle of TCAS alerting function. Finally, the evaluation system with multiple variables is established on System Operating Characteristic (SOC) curve. The validation of the Encounter model is performed under different parameters. Through the simulation under different threshold values, the optimal alerting threshold values are obtained. The experiments show the rationality of the TCAS threshold and verify the validity of our threshold-setting method.

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On the compatibility of ACAS with the concept of segmented independent parallel approach

Hanses

¹

2014

2014 Integrated Communications, Navigation and Surveillance Conference (ICNS) Conference Proceedings

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Although air traffic's growth rate has slowed, airport capacity and environmental issues, especially noise mitigation, are identified as major challenges that face aviation. From the perspective of flight guidance, the development of segmented or curved approach procedures based on required navigation performance (RNP) allow for rerouting around congested areas and is thus a promising approach in coping with these issues. Considering airports with parallel runway systems, an increased airport capacity can be reached when runways are operated independently. This, however, requires straight precision approaches to be conducted according to current guidelines issued by the International Civil Aviation Organization (ICAO).To help pave the way for independent operations of segmented approaches at parallel runway systems, an elementary safety concept was developed in previous work that utilizes the ground-based system of precision runway monitoring. Within this concept, a generic airport scenario with two parallel runways was considered, at which a straight approach is proposed for one of the parallel runways and a segmented or curved approach is assumed for a second runway. Based on this, it was shown that a modified concept of precision runway monitoring is capable of achieving target levels of safety comparable to or even more stringent than those defined in the literature for independent parallel precision approaches.Although the Airborne Collision Avoidance System (ACAS) is by definition not part of this kind of safety assessment, an important question to answer is whether the current ACAS implementation can be characterized as compatible to the proposed approach geometry. Because classical approaches towards parallel runways are already critical with respect to generating nuisance ACAS alerts, this issue might even be exacerbated due to the segmented routing.To approach this issue, a method will be presented in this work that allows for calculating an approach geometry-dependent critical runway spacing that will not result in nuisance ACAS alerts. The obtained value can be compared to a given runway layout to determine whether ACAS may be used or should be deactivated for a given procedure.

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Alerting Threshold Analysis of TCAS

Tuo¹,

Zhang²

2015

TOAUTOCJ

1

0

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A method for the setting and evaluation of TCAS (Traffic Alert and Collision Avoidance System) alerting threshold is proposed in this paper. Firstly, by analyzing the error and uncertainty of the flight path, a stochastic differential equation is introduced to model the random aircraft motion. Then a pilot model according to ICAO standards is given to simulate the TCAS alert event. And then five kinds of alarm outputs are summed up by analyzing the principle of TCAS alerting function. Finally, the evaluation system with multiple variables is established on System Operating Characteristic (SOC) curve. The validation of the Encounter model is performed under different parameters. Through the simulation under different threshold values, the optimal alerting threshold values are obtained. The experiments show the rationality of the TCAS threshold and verify the validity of our threshold-setting method.

show abstract

Applications of Collision and TCAS Alerting Models in Parallel Runways Operations

Cited by 3 publications

References 1 publication

Alerting Threshold Analysis of TCAS

Alerting Threshold Analysis of TCAS

On the compatibility of ACAS with the concept of segmented independent parallel approach

Alerting Threshold Analysis of TCAS

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