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Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

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Appendix C / Axis Transforms<br />

_ _<br />

∂ P&<br />

ZB<br />

o,<br />

m<br />

B<br />

A<br />

∂ Q<br />

: =<br />

⎛ ⎛ q2<br />

⎜ ⎜<br />

⎜ ⎜<br />

⎜ ⎜ q<br />

⎜ 3 ⎜<br />

⎜ 2 ⋅ ⎜<br />

⎜ ⎜<br />

⎜ ⎜<br />

q0<br />

⎜ ⎜<br />

⎜ ⎜<br />

⎝ ⎝ q1<br />

16-18<br />

,<br />

,<br />

,<br />

,<br />

− q<br />

− q<br />

q<br />

q<br />

3<br />

2<br />

1<br />

0<br />

,<br />

,<br />

,<br />

,<br />

q<br />

q<br />

0<br />

1<br />

− q<br />

− q<br />

2<br />

3<br />

⎞<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎠<br />

⋅ P&<br />

A<br />

o,<br />

m<br />

⎞<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎠<br />

T<br />

Equation 16.16-15<br />

The missile incidence is the absolute angle between X B and X MV axes,<br />

ξ<br />

MV<br />

B<br />

⎛ XB<br />

1 P&<br />

⎞<br />

− o,<br />

m<br />

1<br />

: cos ⎜ ⎟<br />

−<br />

=<br />

≡ tan<br />

B β<br />

⎜ P&<br />

⎟<br />

⎝ o,<br />

m ⎠<br />

MV MV<br />

( cos α ⋅ tan )<br />

B<br />

Equation 16.16-16<br />

The variation in incidence with velocity and Alignment frame orientation,<br />

∂ ξ<br />

∂ ξ<br />

∂ P&<br />

∂ Q<br />

MV<br />

B<br />

B<br />

A<br />

MV<br />

B<br />

A<br />

o,<br />

m<br />

: =<br />

: =<br />

P&<br />

P&<br />

XB<br />

o,<br />

m<br />

2<br />

o,<br />

m<br />

⋅ P&<br />

−<br />

A<br />

o,<br />

m<br />

2<br />

− P&<br />

XB ( P&<br />

)<br />

o,<br />

m<br />

2<br />

o,<br />

m<br />

P&<br />

2<br />

⋅<br />

2<br />

o,<br />

m<br />

B<br />

B<br />

B<br />

( T ( 1 ) , T ( 4 ) , T ( 7 ) )<br />

⋅<br />

A<br />

P&<br />

2<br />

o,<br />

m<br />

⎛<br />

⎜<br />

⎜<br />

⎜<br />

⎜<br />

⋅ ⎜<br />

⎜<br />

⎜ 2 ⋅ q<br />

⎜<br />

⎜<br />

⎝ 2 ⋅ q<br />

16.17 Alignment to Seeker LOS Transformation<br />

−<br />

2<br />

3<br />

A<br />

( ) 2 XB<br />

P&<br />

q<br />

q<br />

2<br />

3<br />

⋅ P&<br />

⋅ P&<br />

o,<br />

m<br />

⋅ P&<br />

⋅ P&<br />

XA<br />

o,<br />

m<br />

XA<br />

o,<br />

m<br />

ZA<br />

o,<br />

m<br />

ZA<br />

o,<br />

m<br />

− q<br />

− q<br />

A<br />

T<br />

Equation 16.16-17<br />

− q<br />

− q<br />

1<br />

0<br />

2<br />

⋅ P&<br />

3<br />

⋅ P&<br />

⋅ P&<br />

⋅ P&<br />

YA<br />

o,<br />

m<br />

YA<br />

o,<br />

m<br />

YA<br />

o,<br />

m<br />

YA<br />

o,<br />

m<br />

+ q<br />

0<br />

− q<br />

1<br />

⋅ P&<br />

⋅ P&<br />

ZA<br />

o,<br />

m<br />

ZA<br />

o,<br />

m<br />

⎞<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎟<br />

⎠<br />

Equation 16.16-18<br />

The Euler triplet defining the orientation of the Seeker LOS frame with<br />

respect to the Missile Body frame,<br />

E<br />

S<br />

A<br />

: =<br />

⎛<br />

⎜<br />

⎜<br />

⎝<br />

π<br />

,<br />

− tan<br />

−1<br />

⎛ P<br />

⎜<br />

⎝ P<br />

ZA<br />

m,<br />

t<br />

hA<br />

m,<br />

t<br />

⎞<br />

⎟<br />

⎠<br />

,<br />

tan<br />

−1<br />

⎛ P<br />

⎜<br />

⎝ P<br />

YA<br />

m,<br />

t<br />

XA<br />

m,<br />

t<br />

⎞ ⎞<br />

⎟ ⎟<br />

⎟ ⎟<br />

⎠ ⎠<br />

Equation 16.17-1

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