Terrain Contour Matching (TERCOM):Sensitivity to Heading and Ground-Speed Errors.

摘要

A simulation of the TERCOM navigation system is presented and the effects of a number of error sources are studied. Two error sources are course heading and ground-speed variation. A third source is the fact that the radar altimeter samples the terrain at geographical coordinates lying between coordinates that specify the locations of terrain altitudes stored in the on-board computer. The latter is shown to be an insignificant error with the 400-ft distance between sample points. Course heading and ground-speed errors are shown to be critical problems when they occur simultaneously. Maximum acceptable errors are approximately two degrees course heading at + or - 3% expected ground speed. (Author)