This paper describes one of the key features of the JTIDS/Link 16 tactical data-link, namely its relative navigation facility. A brief overview of the general features of the JTIDS system is given to provide the necessary background to the navigation aspects, and some mention is made of the message-exchange facilities. The main part of the paper describes how the JTIDS system provides the capability to perform accurate navigation, and discusses the basic principles of its operation. Some applications of the navigation function which enhance operational effectiveness are then described. The following topics are covered:

(ii) JTIDS Architecture

(i) Definition of JTIDS/Link 16

(iii) Principles of Relative Navigation

(iv) Source Selection

(v) The Kalman Filter

(vi) Time Synchronization

(vii) The Use of Relative Navigation

(viii) The Relative Grid