초록

A radar gathers terrain data which is compared to a stored terrain data base using a test statistic. The test statistic can be used to validate the terrain data base information and/or the aircraft position data.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of validating a position of an aircraft, comprising the steps of:receiving signals representative of a reported position of the aircraft, the reported position being an approximation of an actual position;receiving active sensor signals representative of terrai

[ What is claimed is:] [1.]1. A method of validating a position of an aircraft, comprising the steps of:receiving signals representative of a reported position of the aircraft, the reported position being an approximation of an actual position;receiving active sensor signals representative of terrain of a map area surrounding the actual position of the aircraft;accessing a database of terrain information corresponding to the map area;correlating the sensor signals with the terrain information to compute a difference therebetween; andrejecting the reported position of the aircraft when the difference exceeds a predetermined threshold.