Download e-book for kindle: Aeroguide 23: Republic Fairchild A-10A Thunderbolt II by Roger Chesneau

By Roger Chesneau

ISBN-10: 0946958289

ISBN-13: 9780946958283

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Additional info for Aeroguide 23: Republic Fairchild A-10A Thunderbolt II

Sample text

I n the more usual case where only three instruments are used in an attempt t o instrument an orthogonal set, considerable effort is made t o mount the instruments so t h a t their input axes are mutually orthogonal. Since perfect physical alignment can never be achieved, test procedures have been developed as part of the instrument alignment procedures t o account for the effects of instrument nonorthogonality. 3 Gyro Frame (g frame; x,, y, z, a x e s ) The gyro frame, like the accelerometer frame, is defined by the input or sensitive axes of each gyro.

Thus G C ~ C ; can be written in geographic components as follows: + where, for this particular transformation, v, = 62 cos L , v, = -dL, and vD == -62 sin L The parameters VN, vE, vD are interpreted as the error angles about the positive north, east, and down directions, respectively, which account for the transformation error in 63. 2 Transformations with Explicit Orthogonality Constraint'. In this case a transformation is computed between two orthogonal reference frames based on the relative angular velocity between the two frames.

3. 3 Platform-instrument geometry. 4 and I Two-dimensional force measurement. identity matrix Oij = component of 8, resulting from a rotation about the j t h platform axis. = The six independent angles, Bij, are estimated via the instrument alignment procedures mentioned previously. It is insufficient to merely multiply the specific force measurements by the Cg transformation of Eq. 3-30 to obtain the platform referenced specific force. This situation arises because a physical vector measured by a nonorthogonal set of instruments and coordinatized in orthogonal axes will not be the same vector as that measured by an orthogonal set of instruments.

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Aeroguide 23: Republic Fairchild A-10A Thunderbolt II by Roger Chesneau

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