IFF Reply Coding

Abstract

In a transponder type of IFF system, cryptographically coded, deliberate garbling of the code by an enemy to appear friendly must not be permitted. To prevent this, frequency-coding is more satisfactory than pulse-coding, but the latter may be suitable for the auxiliary function of aircraft control. The probability of deception by guessing the correct code is computed for several system designs, and it is shown that a relatively small number of reply codes is ample to make this probability low if appropriate integration of replies is required before deciding that the indication is friendly.

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Document Details

Document Type
Technical Report
Publication Date
Aug 31, 1949
Accession Number
AD1211605

Entities

People

  • C. E. Cleeton

Organizations

  • United States Naval Research Laboratory

Tags

Fields of Study

  • Mathematics

Readers

  • Aerospace Test and Evaluation
  • Computer Programming and Software Development.
  • Team-Based Human-Centered Cognitive Task Decision Making and Information Performance.