Traffic Information Service-Broadcast Research Articles

효율적인 항공교통관리를 위한 Onboard Multilateration 시스템

In the next generation of ATM, ADS-B(Automatic Dependent Surveillance-Broadcast) and multilateration are the main technology recommended by ICAO(International Civil Aviation Organization). However, there are a lot of non-equipped ADS-B aircraft today. Therefore, TIS-B(Traffic Information Service-Broadcast) provides traffic information, which has obtained from radars for non-equipped ADS-B aircraft. In this paper, we presented an onboard multilateration system for non-equipped ADS-B aircraft using SSR(Secondary Surveillance Radar) signal instead of TIS-B. TIS-B has a lot of error because of using radar data, but multilateration has less error than radar because of using TDOA(Time Difference of Arrival) method. Results of performance analysis show that the position accuracy is improved by the proposed method using on-board multilateration. Key words : ATM, Multilateration, ADS-B, TIS-B, SSR, TDOA

Navigation Accuracy Category-Position Models and Estimate Position Uncertainty Calculations for TIS-B System

Navigation accuracy category-position (NACp) is an important parameter for system accuracy of traffic information service-broadcast (TIS-B), which is determined by estimate position uncertainty (EPU). Centered about the problems that the existing EPU calculation based on noise measurement is low in accuracy and unfit for describing uncorrected biases in target reports, this article analyses the traditional NACp model, and uses the least square estimation (LSE) in EPU calculation. Furthermore, it proposes an extended NACp model, which considers both noise and biases and acquires EPU estimation with the help of approximate multiplex Taylor expression. Analysis and simulation show that the proposed method not only leads to significant improvement of the accuracy of EPU calculation, but is fit for EPU calculation with tracking biases in TIS-B system as well. As such it can find application in practice to depict different kinds of error models in TIS-B system.

Data communications concept for a SATS scenario

The small aircraft transportation system (SATS) concept envisions doorstop to destination transportation in a safe and timely manner. Data communications are a key component in achieving the aviation-related operational performance improvements that are sought. However, data communication doesn't start when you get into the aircraft; it starts back at the location where the flight is planned. In fact, data communications support the pilot in all phases of the flight: flight planning, pre-flight, departure, en route, transition, approach, landing, and rollout as well as for a missed approach. The Internet is being used to perform flight planning activities, and the mobile communications available today support Internet access en route to the departure airfield. On-board the aircraft, data communications provide surveillance and air traffic control (ATC) support to the pilot. The location of other aircraft is available to the pilot and ATC system through automatic dependent surveillance-broadcast (ADS-B) and traffic information service-broadcast (TIS-B) applications that transmit the location of other aircraft in the vicinity. Other aircraft locations are used to forecast potential conflicts and, thus, enhance flight safety. As the aircraft nears a SATS-equipped airfield, the pilot uses data link messages to request a landing sequence. The airport management module (AMM) provides a landing sequence assignment to the aircraft. As the pilot maneuvers the aircraft for a landing, he/she is using data-linked surveillance data to determine the location of other aircraft and maintain a safe separation distance between aircraft even in a low visibility environment.

Traffic Awareness for General Aviation (TAGA)

A project called “Traffic Awareness for General Aviation (TAGA)” was performed in the Federal Republic of Germany. The project focused on investigating the feasibility and identifying possible safety benefits of performing the “Enhanced Visual Acquisition for See & Avoid” application within German VFR airspace in the vicinity of Frankfurt/Main. The following hypotheses were to be assessed in the project:•It is possible to enhance the traffic detection probability of General Aviation pilots flying under visual flight rules by means of a Cockpit Display of Traffic Information (CDTI).•General Aviation pilots are able to monitor a CDTI and to detect in time potential conflicting aircraft on the CDTI during a normal flight performed under visual flight rules.•It is possible to derive traffic information for the performance of a see-and-avoid application from a Traffic Information Service Broadcast (TIS-B).In order to meet the objectives of the project, an experimental TIS-B ground system based on the VDL Mode 4 data link technology was installed. The TIS-B service was based on radar surveillance data from the ground radar data network. Three General Aviation aircraft were equipped with appropriate airborne equipment, and a flight trial campaign was performed during May 2002 and April 2003.

Augmenting ADS-B with traffic information service-broadcast

The great interest in implementing Airborne Separation Assistance System (ASAS) applications is tempered by the uncertain pace of user equipage. A means to provide surveillance data to airborne users through ground-based Traffic Information Service-Broadcast (TIS-B) can speed the transition and reward early equipage. This paper describes the concepts and functionality being developed by RTCA Special Committee 186 Working Group 2, as well as foreseen improvements and current testing activities. Active coordination is continuing with international standards developments.

ADS-B Surveillance Quality Indicators: Their Relationship to System Operational Capability and Aircraft Separation Standards

Use of Automatic Dependent Surveillance-Broadcast (ADS-B) data for support of aircraft separation is examined on the basis of a Close Approach Probability (CAP) model previously used for determination of radar based minimum separation standards. A central concern in this treatment relates to the integrity of the GPS derived position estimates reported by ADS-B, and how undetected failures in GPS integrity monitoring affect safe separation requirements. A review of the GPS integrity monitoring concept shows the relationship between the probability of missed detection of an error and the false detection rate, and how the resulting factors influence overall system performance. Comparisons of ADS-B based and radar based surveillance are then made. These comparisons indicate the adequacy of ADS-B for separation maintenance. During the transition to full ADS-B equipage, ground based radar estimates on unequipped targets will be up-linked to ADS-B equipped aircraft in a concept termed Traffic Information Service-Broadcast (TIS-B). Application of the model to TIS-B again shows ADS-B supports separation services under very conservative assumptions.