Abstract: A system (400, 500) and method (800) of personal inertial navigation measurements can include measuring (802) an angle, measuring (804) an angular velocity independent of an angle measurement, measuring (806) an angular acceleration independent of the angle measurement and independent of an angular velocity measurement, and combining (808) the angle measurement, the angular velocity measurement, and an angular acceleration to provide an angled output. The angle measurement can be measured using a compass or magnetic field, the angular velocity can be measured using a gyroscope (such as a MEMS gyroscope), and the angular acceleration measurement can be measured using an angular accelerometer (such as a molecular electronic transfer device having a magneto hydrodynamic effect device). The method can further include suppressing (810) noise caused by the angle measurement by using a sample and hold circuit (504) controlled by a higher ordered component to suppress noise from a lower ordered component.

Abstract: A method of altitude correction of an inertial navigational device, the method comprising the steps of: receiving (205) a relative altitude of the inertial navigational device; obtaining (210) a rate of change of the relative altitude of a reference device; and calculating (215) an absolute altitude of the inertial navigational device based on the relative altitude of the inertial navigational device and the rate of change of the relative altitude of the reference device. The invention also provides for a device (505) such as base station, computer or a laptop to enable altitude correction of an inertial navigational device.

Abstract: A rotary control assembly (400) for a communication device includes a magnetic sensor (410) integrated within a housing (406) and a magnet (404) integrally coupled to a rotary control (402) for controlling the magnetic sensor. User rotation of the rotary control (402) and integral magnet (404) controls resistance of the magnetic sensor (410). The variation in resistivity of the magnetic sensor (410) corresponds to selection options associated with the rotary control. The rotary control assembly (400) provides a self-sealed environment. Either continuous variable control or defined detent control can be incorporated into a communication device using assembly (400).

Abstract: A rotary control assembly (400) for a communication device includes a magnetic sensor (410) integrated within a housing (406) and a magnet (404) integrally coupled to a rotary control (402) for controlling the magnetic sensor. User rotation of the rotary control (402) and integral magnet (404) controls resistance of the magnetic sensor (410). The variation in resistivity of the magnetic sensor (410) corresponds to selection options associated with the rotary control. The rotary control assembly (400) provides a self-sealed environment. Either continuous variable control or defined detent control can be incorporated into a communication device using assembly (400).