Honeywell International Inc.

Pavol Malinak

Zdenek Kana

Milos Sotak

Mats Anders Brenner

James Arthur McDonald

Jindrich Dunik

Radek Baranek

Systems and methods for integrity monitoring of primary and derived parameters are described herein. In certain embodiments, a method includes transforming an estimated error state covariance matrix of at least one primary integrity monitoring parameter of a navigation system onto an error state covariance matrix of one or more derived integrity monitoring parameters, wherein the one or more derived integrity monitoring parameters depends from the at least one primary integrity monitoring parameter. The method also includes transforming an integrity threshold of the at least one primary integrity monitoring parameter onto separation parameters of the one or more derived integrity monitoring parameters. The method further includes computing a protection limit for the one or more derived integrity monitoring parameters.

Integrity monitoring of primary and derived parameters

An attitude and heading reference system (AHRS) for a vehicle comprises an IMU that generates inertial measurements, a heading source that generates heading measurements, an attitude filter in communication with the IMU, and a heading filter in communication with the heading source. The attitude filter receives inertial measurements from the IMU; computes an attitude estimation comprising attitude estimates and covariances for the attitude estimates; and outputs the attitude estimation. The heading filter receives the heading measurements, when available, from the heading source; receives the attitude estimation, comprising the attitude estimates and the covariances for the attitude estimates; computes a heading estimation comprising a heading mean estimate and a heading variance; and outputs the heading estimation. The attitude estimation output from the attitude filter is independent of any availability of the heading measurements, such that the attitude estimation output is available at all earth regions during operation of the vehicle.

Polar region operating attitude and heading reference system

An attitude and heading reference system (AHRS) for a vehicle is provided along with methods for mitigating vehicle acceleration effects in the AHRS. The AHRS comprises an inertial measurement unit configured to generate inertial measurements from at least one accelerometer and at least one gyroscope, a heading source configured to generate heading measurements, and an adaptive statistical filter configured to mitigate the impact of vehicle acceleration effects on attitude and heading.

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Markusovce, Slovakia

Pavol Malinak