Terrain referenced navigation-Schuler cycle error reduction meth

Details Terrain referenced navigation-Schuler cycle error reduction meth Terrain referenced navigation-Schuler cycle error reduction meth

1992-06-15

1995-09-12

Zanelli, Michael

Boots, shoes, and leggings

364443, 364578, 364572, G06F16500

Patent

active

054503450

ABSTRACT:
A method for Schuler cycle error reduction is provided for use in a terrain referenced navigation system. Terrain Reference Navigation filter coefficients are analytically determined using a terrain reference navigation database and a hypothetical Schuler cycle. The optimum filter coefficients are determined assuming that there will be three parallel filters being executed during flight. The first filter is a nominal filter which represents a compromise between sensing zero crossing of a Schuler cycle error and peak changes of a Schuler cycle. The other filters are chosen to be perpendicular to the instantaneous line of flight. One is a peak filter, the other is a zero crossing filter. The peak filter is set to capture the inertial navigation unit when the Schuler cycle is changing rapidly. The zero crossing detector is set to capture the inertial navigation unit when it is zero crossing. The Schuler cycle is detected by algebraically noting similar features of each filter. INS measurements are then dynamically compensated for the now known Schuler cycle.

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patent: 5008825 (1991-04-01), Nadkarni et al.
patent: 5247748 (1993-09-01), Hojo et al.
Boozer et al; The AFTI/F16 Terrain-Aided Navigation System; IEEE National Aerospace and Electronics Conference; May 20-24, 1985; pp. 351-357.

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