Systems and techniques for sensor-derived object flight performance tracking are described herein. A set of magnetometer readings may be obtained from a magnetometer included with an object. A local rotation axis of the object may be determined at a time using the set of magnetometer readings. The local rotation axis may describe rotation of the object around a local magnetic target. A global rotation axis may be calculated based on an initial orientation of the object. The global rotation axis may describe a fixed rotation axis of the object during flight in a global coordinate frame, wherein an angle between the global rotation axis and magnetic north remains constant during the flight. An orientation of the object may be determined for the time using the global rotation axis and the local rotation axis of the object at the time.

A wearable user device includes a first hearing aid configured to be disposed within a first ear of a user comprising a first MEMS accelerometer, a first magnetometer, and a first power source, wherein the first MEMS accelerometer is configured to determine a first plurality of movement data in response to a first head motion of the user, wherein the first magnetometer configured to determine a second plurality of movement data in response to the first head motion of the user; and wherein the first power source is configured to provide operating power to the first hearing aid, the first MEMS accelerometer, and to the first magnetometer, and a processor coupled to the first hearing aid, wherein the processor is configured to determine a first plurality of rotation data associated with the user in response to the first plurality of movement data and the second plurality of movement data.

A magnetic tunnel junction (MTJ) based sensor device includes a MTJ element and processing circuitry. The MTJ element includes a free layer, a pinned layer, and a tunnel barrier, the tunnel barrier being arranged between the free layer and the pinned layer. The free layer is adapted to flex away from the tunnel barrier during acceleration. The processing circuitry is configured to measure a resistance at the MTJ element and determine acceleration based on the resistance at the MTJ element.

A magnetic tunnel junction (MTJ) based sensor device includes a MTJ element and processing circuitry. The MTJ element includes a free layer, a pinned layer, and a tunnel barrier, the tunnel barrier being arranged between the free layer and the pinned layer. The free layer is adapted to flex away from the tunnel barrier during acceleration. The processing circuitry is configured to measure a resistance at the MTJ element and determine acceleration based on the resistance at the MTJ element.

Systems and techniques for sensor-derived object flight performance tracking are described herein. A set of magnetometer readings may be obtained from a magnetometer included with an object. A local rotation axis of the object may be determined at a time using the set of magnetometer readings. The local rotation axis may describe rotation of the object around a local magnetic target. A global rotation axis may be calculated based on an initial orientation of the object. The global rotation axis may describe a fixed rotation axis of the object during flight in a global coordinate frame, wherein an angle between the global rotation axis and magnetic north remains constant during the flight. An orientation of the object may be determined for the time using the global rotation axis and the local rotation axis of the object at the time.

Systems and techniques for sensor-derived object flight performance tracking are described herein. A set of magnetometer readings may be obtained from a magnetometer included with an object. A local rotation axis of the object may be determined at a time using the set of magnetometer readings. The local rotation axis may describe rotation of the object around a local magnetic target. A global rotation axis may be calculated based on an initial orientation of the object. The global rotation axis may describe a fixed rotation axis of the object during flight in a global coordinate frame, wherein an angle between the global rotation axis and magnetic north remains constant during the flight. An orientation of the object may be determined for the time using the global rotation axis and the local rotation axis of the object at the time.

An MLU-based accelerometer including: at least one MLU including a tunnel barrier layer between a first magnetic layer having a fixed first magnetization direction and a second magnetic layer having a second magnetization direction that can be varied. A proof-mass includes a ferromagnetic material having a proof-mass magnetization inducing a proof-mass field, the proof-mass being elastically suspended such as to be deflected in at least one direction when subjected to an acceleration vector. The proof-mass is magnetically coupled to the MLU cell via the proof-mass field. A read module is configured for determining a magnetoresistance of each MLU cell such as to determine an acceleration vector from the deflection of the proof-mass relative to any one of the at least one MLU cell.

Systems and techniques for sensor-derived object flight performance tracking are described herein. A set of magnetometer readings may be obtained from a magnetometer included with an object. A local rotation axis of the object may be determined at a time using the set of magnetometer readings. The local rotation axis may describe rotation of the object around a local magnetic target. A global rotation axis may be calculated based on an initial orientation of the object. The global rotation axis may describe a fixed rotation axis of the object during flight in a global coordinate frame, wherein an angle between the global rotation axis and magnetic north remains constant during the flight. An orientation of the object may be determined for the time using the global rotation axis and the local rotation axis of the object at the time.

An MLU-based accelerometer including: at least one MLU including a tunnel barrier layer between a first magnetic layer having a fixed first magnetization direction and a second magnetic layer having a second magnetization direction that can be varied. A proof-mass includes a ferromagnetic material having a proof-mass magnetization inducing a proof-mass field, the proof-mass being elastically suspended such as to be deflected in at least one direction when subjected to an acceleration vector. The proof-mass is magnetically coupled to the MLU cell via the proof-mass field. A read module is configured for determining a magnetoresistance of each MLU cell such as to determine an acceleration vector from the deflection of the proof-mass relative to any one of the at least one MLU cell.