# IEEE 1559-2009 pdf free

**IEEE 1559**-2009 pdf free.IEEE Standard for Inertial Systems Terminology.

2.37 coning: Motion of an axis that results from a combination of oscillatory motions about perpendicular axes and generally describes a cone. An apparent angular drift rate is generated about the coning axis equal to the solid angle swept per unit time and is a function of the amplitudes and frequencies of oscillations present and the phase angles between thcm.

NOTE In a strapdown inertiat system high rate (typically on the order of lituidreds or thousands of hertz) sampling andor compensation algorithms are required for proper compensation of the apparent drill rate.

2.38 coning algorithm: An algorithm that compensates for coning motion in a strapdown inertial system. It combines samples from the three gyroscopes to form a coning correction that compensates for the apparent drift rate and for finite sampling of the gyroscope outputs. Mathematically, the purpose of the coning algorithm is to provide a high fidelity approximation of the rotation vector representing the composite rotational motion across one attitude integration or update period. High performance coning algorithms utilize several samples of gyro data per attitude integration period.

2.39 control moment gyro: Ciimbaled spinning wheel gyroscope for controlling vehicle attitude through the reaction caused by torquing the gimbals.

2.40 control segment (space-based radio navigation system): The ground sites of a space-based radio navigation system that obtain telemetry and tracking data, and control the satellites. They determine the orbits and monitor the health of the satellites. They send the satellite ephemeris and status data, and station keeping. clock correction, and other commands to the satellites.

2.41 coordinated universal time (trTC): The Greenwich atomic clock time broadcast by the national time services. A leap second is introduced in the time service broadcasts if required on either January 1 or July I to keep UTC within 0.9 s of Greenwich mean solar time (UT I).

NOTE- The UTC sccond is the international system (SI) second,

2.42 craft rate: The angular velocity resulting from level flight over the curvature of the earth. (‘raft rate is V/(R+h), where Vh is the velocity in the horizontal plane. R, is the local radius of curvature of the earth in the direction of Vh, and h is the altitude.

2.43 data fusion: The process of combining diverse types of data. Inertial systems often use data fusion to combine inertial sensor outputs with the outputs of various aiding devices producing an output that is commonly referred to as a blended solution. These systems are often referred to as aided or integrated inertial systems.

NOTE—Data fusion techniques include Kalman filter and maximum likclihood estimation

2.44 data latency: The time interval between the occurrence of an event and the availability of its measurement.

2.45 data time tag: The time associated with the measurement of an event that best represents when the event occurred.

2.46 datum: A mathematical model of the earth, which includes a reference ellipsoid with a specified point of origin. A datum can be optimized globally, such as WGS-84. but is usually optimized for a local area.IEEE 1559 pdf download.