Performance Evaluation of Integrated INS/GPS Systems

by Daniel Vonk

Inertial navigation systems and the global positioning system are two systems that estimate the same variables using very different methods. Each system is defined by the method that it employs to create a solution. The performance of an integrated system using both inertial navigation and global positioning data will be characterised by the components and correlations between the systems. To examine the performance of the integrated system it is necessary to start with an analysis of the individual components to enable understanding of the errors and systems that the integration will be based upon. The achievement of precise information from an integrated system is only capable through identifying the elements of each system that are beneficial to the combined system.

Performance Evaluation involves forming an idea or judgment about the manner and efficiency of the function of a system. The performance evaluation of a system is only realised through evaluation of a systemís components and composition, as they assist in the performance of its function. The performance of an integrated system therefore requires an evaluation of the individual components, and how they are used, in order to form a reasonable judgment. In this case the components are inertial navigation systems and the Global Positioning System. A flow diagram below shows the steps of evaluation that are required in the analysis of the integrated system.

Similarly to integrated systems, the required evaluation of inertial navigation systems is only achievable through an evaluation of its components and composition. The recursive nature of performance evaluation requires that a study of the integrated system must begin with an evaluation of all components that may be present in the final system.