Abstract: A device for estimating an aircraft's speed relative to the ground and heading, while making no use of the rotation of the Earth or of the Earth's magnetic field. The device comprises in particular a first linear estimator that hybridizes a measurement of the speed of the aircraft relative to the ground as provided by a global navigation satellite system (GNSS) receiver with measurements of the acceleration and the attitudes of the aircraft coming from an attitude and heading reference system (AHRS) device without a gyrocompass and without a magnetometer. The first estimator is made linear by replacing the single “heading error estimate ??” state of prior art embodiments with two states, namely estimates of the sine and of the cosine of the heading error.

Abstract: A device for estimating an aircraft's speed relative to the ground and heading, while making no use of the rotation of the Earth or of the Earth's magnetic field. The device comprises in particular a first linear estimator that hybridizes a measurement of the speed of the aircraft relative to the ground as provided by a GNSS receiver with measurements of the acceleration and the attitudes of the aircraft coming from an AHRS device without a gyrocompass and without a magnetometer. The first estimator is made linear by replacing the single “heading error estimate ??” state of prior art embodiments with two states, namely estimates of the sine and of the cosine of the heading error.