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

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Glossary<br />

_ _<br />

0.19 Systeme Internationale D’Unites<br />

0.19.1 Base Units<br />

PARAMETER UNITS SYMBOL<br />

0.19.2 Supplementary Units<br />

0.19.3 Derived Units<br />

Length metres m<br />

Mass kg kg<br />

Time seconds s<br />

Temperature degrees kelvin K<br />

PARAMETER UNITS SYMBOL<br />

Plane angle radians rad<br />

Solid angles Steradians sr<br />

PARAMETER UNITS SYMBOL<br />

Force Newton N<br />

Frequency Hertz Hz<br />

Power Watt W<br />

Pressure Pascal Pa<br />

Linear velocity, acceleration and jerk are specified in (m/s), (m/s 2 ) and<br />

(m/s 3 ).<br />

Angular velocity, acceleration and jerk are specified in (rad/s), (rad/s 2 ) and<br />

(rad/s 3 ).<br />

0.20 Absolute and Relative Time<br />

Time is denoted by (t) which is usually referenced to a common standard<br />

such as NAVSTAR GPS, IRIG-B etc. The time when an object exists at<br />

point (p) is (tp). When geometric points and frames are not explicitly time<br />

referenced they exist at the current time (t). For example, the estimated<br />

target position at its predicted impact time with the missile, expressed in the<br />

current Missile Body frame is,<br />

B(t)<br />

B<br />

o, t(t ) P<br />

i<br />

o, t(ti<br />

)<br />

ˆ<br />

P ˆ ≡<br />

xlv

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