Main Threats and Solutions for Positioning by Navigational Aids Network

There are many systems on board of civil airplane for coordinatesmeasurements. Global Navigation Satellite System is used as a primary positioning sensor. As a stand-by, positioning by navigational aids can be used in case of malfunction of the primary system. Both positioning systems, except inertial navigation system, are grounded on signals measurements and data transferring via communication channels. In paper we study the main threats that can affect communication chan-nels between different parts of navigation equipment and analyze its potential im-pact into positioning performance. We discuss interference of radio waves, unin-tentional jamming and spoofing threats, threats of usage not valid air navigation data and missing optimal pair of navigational aids due too poor standard service volume model. As a result, a possible solution for each of these threats detection and minimization of their impact is proposed, based on improvements of data processing inside of Flight Management System.