MODELING ACTIVE BEACON COLLISION AVOIDANCE SYSTEM (BCAS) MEASUREMENT ERRORS: AN EMPIRICAL APPROACH

The Active Beacon Collision Avoidance System (BCAS) algorithm evaluation required the development of accurate input error models. This document describes a methodology used to model Active BCAS errors associated with the measurements of altitude and range. The models were required for use in the analysis of Active BCAS resolution performance in an error-degraded environment. A time series analysis of two independent sets of data from Active BCAS surveillance tracker test flights showed that Active BCAS measurement errors are highly sequentially correlated (auto-correlated) and time dependent. This indicated that dynamic (time dependent) models are more appropriate than the previous static (time independent) models. The analysis showed that range and altitude measurement errors could be characterized using first and second order autoregressive processes. The improvement in the characterization of the errors was achieved without increasing the model complexity. The number of parameters was increased by one compared to the number of parameters of the previous static models. With availability of more sets of data, not necessarily larger sets, the methodology could be applied to increase the accuracy of the parameter estimates. The methodology, described herein, could be applied to develop altitude and range measurement error models for other collision avoidance systems in which similar tracking procedures were used. (Author)

  • Corporate Authors:

    NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER

    ATLANTIC CITY, NJ  United States 

    Federal Aviation Administration

    800 Independence Avenue, SW
    Washington, DC  United States  20591
  • Authors:
    • Billmann, B
    • THOMAS, J
    • MORGAN, T
    • Windle, J
  • Publication Date: 1980-5

Media Info

  • Pagination: 30 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318891
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-NA-80-3, FAA-RD-80-34
  • Files: NTIS, USDOT
  • Created Date: Oct 27 2002 12:00AM