Starting with the elemental rules of navigation, this paintings takes a step past introductions with a concise examine the flight purposes of inertial navigation structures built-in with worldwide Positioning procedure (GPS) satellite tv for pc structures.

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Extra info for Integrated Navigation and Guidance Systems

Sample text

Other frames of importance are the Earth-centered, Earth-fixed frame CECEF and the inertial frame C/ with origins at Earth's center of mass. Often at the start of a mission, the vehicle-carried frame Cv defines a navigation frame Cn in which the North axis iv is rotated about kv through wander angle a to locate in the local horizontal plane. Then the navigation frame in is not slaved to North as the vehicle travels across Earth's surface. This is important for navigation at high latitudes. These primary frames are important to mathematically define the navigation concepts of vehicle attitude, the local horizon, Newtonian and local vertical gravity, and Earth-referenced velocity.

It states that the time rate of change of an arbitrary vector, as measured in a coordinate system C2 rotating with respect to another coordinate system Ci, is equal to the time rate of change as measured in C2 added to the angular velocity u>2/i crossed into the arbitary vector. For instance, the time rate of change of relative position vector pk as measured in an inertial coordinate system C,-, is equal to the rate of change of position vector pk as measured in Ce (previously defined as relative velocity v#) added to the angular velocity u>e/i crossed into pk.

1 1). The outputs of an INS are capable of rapid, accurate change, and an INS is thus labeled a high bandwidth device. These outputs, moreover, are totally passive, do not depend on ground facilities or transmitted signals, and cannot be jammed or spoofed from outside the aircraft. Regardless of the precision and sensitivity of its sensors, however, the mathematical accuracy associated with computing is dependent on precise initial conditions and is susceptible to long-term drifts from the sensors as well as round-off errors within the computer.