Patent ID: 6281836
Filing Date: 2001-08-28
Classification: G01C,G01S

Abstract:
A method for satellite supplementary navigation of a moving platform using a satellite data supplemented by a satellite-calibrated baro data; said moving platform including a satellite receiver and a barosensor; said method comprising the steps of:(a) acquiring a plurality of satellite signals;(b) checking whether a satellite configuration is substantially sufficient;(c) if said satellite configuration is substantially sufficient, and if said satellite data obtained from said substantially sufficient satellite configuration utilizing said satellite receiver is substantially sufficient,(c1) continuously computing a horizontal protection level (HPL) and a vertical protection level (VPL);(c2) checking whether said horizontal protection level (HPL) is less than or equal to a horizontal alert limit (HAL);(c3) if said horizontal protection level (HPL) is less than or equal to said horizontal alert limit (HAL), declaring a receiver autonomous integrity monitoring (RAIM) function available and declaring said satellite data obtained by using said satellite receiver as substantially sufficient for obtaining position fixes of said moving platform;(c4) if said horizontal protection level (HPL) is greater than said horizontal alert limit (HAL), declaring said receiver autonomous integrity monitoring (RAIM) function unavailable and declaring said satellite data obtained by using said satellite receiver as not substantially sufficient for obtaining position fixes of said moving platform; and(d) if said satellite configuration is not substantially sufficient, or if said satellite data obtained from said substantially sufficient satellite configuration is not substantially sufficient, supplementing said satellite data by said satellite-calibrated baro data obtained utilizing said barosensor.