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shows the block diagram of the ADS-B/Surveillance Data Link system. The ADS-B/Surveillance Data Link system transmits the IAPR state variable data for the aircraft (which the aircraft performing an independent approach on the adjacent runway can monitor) and receives the IAPR state variable data from the adjacent aircraft. The IAPR state variable data broadcast from the aircraft enables the Collision-Alerting Avionics of other aircraft to predict a collision. Conversely, the IAPR state variable data the aircraft receives from other aircraft enables it to predict a collision with these aircraft. The Attitude Heading Reference System (AHRS), GPS receiver, and INS provide the sensor data that make up the IAPR state variable data. However, these three sensors provide redundant information, and sufficient data are available if two of the three are functional. (Note that the GPS receiver and the INS are not included in the ADS-B/Surveillance Data Link function, having already been included in the IAPR RNP navigation function.)
Source publication
For NASA's air transportation research program, we demonstrate an approach to integrating reliability, performance, and operational procedure modeling into a system safety analysis. Our methodology is distinguished by its ability to merge system design/functionality information with the dynamic parameterization of a system's situation to generate a...
Citations
... The route consists of several segments of lines and the query is defined as a series of cones because of the uncertainties as the distance from a starting point increases. Similarly, an angular query can be defined in a Space Transportation System to check the objects, e.g., satellites, within the route of a spacecraft [23]. ...
Angular similarity measures have been utilized by several database applications to define semantic similarity between various data types such as text documents, time-series, images, and scientific data. Although similarity searches based on Euclidean distance have been extensively studied in the database community, processing of angular similarity searches has been relatively untouched. Problems due to a mismatch in the underlying geometry as well as the high dimensionality of the data make current techniques either inapplicable or their use results in poor performance. This brings up the need for effective indexing methods for angular similarity queries. We first discuss how to efficiently process such queries and propose effective access structures suited to angular similarity measures. In particular, we propose two classes of access structures, namely, angular-sweep and cone-shell, which perform different types of quantization based on the angular orientation of the data objects. We also develop query processing algorithms that utilize these structures as dense indices. The proposed techniques are shown to be scalable with respect to both dimensionality and the size of the data. Our experimental results on real data sets from various applications show two to three orders of magnitude of speedup over the current techniques
... series of cones because of the uncertainties as the distance from a starting point increases. A similar conical query can be defined in a Space Transportation System [17] to check the objects, e.g., satellites, within the the route of a spacecraft. A conical query can be created by asking for the similarity between feature vectors using the angular distance as the similarity measure. ...
Conical queries are a novel type of query with an increasing number of applications. Traditional index structures and retrieval mechanisms, in general, have been optimized for rectangular and circular queries, rather than conical queries. In this paper, we focus on conical queries which can be defined as a multi-dimensional cone in a multi-dimensional data space. We develop a model for expressing such queries and suggest efficient techniques for evaluating them. In particular, we explore the retrieval problem in the context of conical query processing and develop multi-disk allocation methods specifically for processing conical queries. i 1 Introduction Recent developments in technology have introduced different types of multimedia data into modern applications. Examples of such applications include multimedia information systems [16, 31, 32], astronomical [35, 1, 23], geographical [10], and document [32, 12, 14, 13] data repositories. The data objects in these applications ar...
... Figure 19. Geosynchronous Communication Satellite Coverage Model With No Spare....... 40Figure 20. ...
... The use of the civil aviation system is expected to increase significantly over the next decade, thus technology applied to increase the economic efficiency of civil aviation must simultaneously increase safety by an even greater factor. Since investment is required to achieve 1 The development of this methodology has been the goal of several earlier programs in which we have participated [19], [20]. both objectives, a new level of scrutiny will be required from the analytical tradeoff studies that support the decision to apply any new technology. ...
Semi-Markov Specification Interface Tool) provides a flexible, user-friendly interface for the textual description of the system's architecture. The ASSIST program builds the model by recursively applying the transition rules that are defined for the architecture. This Markov model description may then be used within the PAWS reliability analysis program. The PAWS (Pade Approximation With Scaling) program calculates the state probabilities at a given mission time. A wrapper routine (TARAT [3]) iterates through the subsystems and combines the results, yielding the overall functional modes. Surveillance Radar Reliability Model Figure 11 is a simplified top-level diagram of a surveillance radar system. This is a generic diagram representing a system with dual redundant-critical components. The system includes both a primary radar that can track the skin return from any target in its coverage area and a secondary radar, or beacon system, which sends out interrogations that trigger transp...
