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In vision aided terminal inertial navigation system, the camera always attaches rigidly, or straps down, to the body of missile. Because the pitch angle of the missile usually is not constant and varies with time, the optical axis of the camera is not vertical. Then the rectangular border of the runway stripe in horizontal land plane is projected as trapezoid in the image plane. The weak perspective...
In the dither ring laser gyro (DRLG) strapdown inertial navigation system (SINS), gyro outputs are often pre-filtered to eliminate the dither modulated, but the influence of the filtered data on the attitude algorithm Is often ignored. It is found that the conventional coning algorithms can not work to high accuracy for the filtered gyro outputs which have a shaped frequency. So the coning algorithm...
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