Navigation data integrity model
With the increasing reliance on co-ordinate data implicit in area navigation (RNAV) and global navigation satellite systems (GNSS), the integrity and quality of such data become critical. This report presents the findings of a study undertaken to examine the various factors which govern the quality and integrity of coordinate data used in air navigation.The study first defines explicitly various terms, such as integrity, precision and accuracy, which are necessary for a precise description of the processes involved in the assessment of the quality of navigation data. Descriptions are then given of the overall process by which navigation co-ordinate data are originated and promulgated and of the basic principles of quality assurance. A model describing and categorising the various types of co-ordinate data used in air navigation is then proposed along with various candidate methods for the provision of data integrity. Conclusions are drawn and recommendations made relating to the data model, quality framework, the use of cyclic redundancy checks (CRC), data quality fields and NOTAM procedures.Annexes are included which describe the use of CRC's and the relationships between various international quality standards.