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

Chapter 9 / Performance
_ _
XM ( > L ) ∧ ( P&
< V ) ⇒ LAUNCH : = 2
Pm T
o,
m S
9-5
Equation 9.1-3
For BTT the fins are unlocked for roll control as the missile clears the tube
however, pitch plane manoeuvring is delayed until aerodynamic control is
established.
9.1.4 Flight Phase 3
Although the missile has reached a stable speed, controlled lateral motion is
prevented until the fins are unlocked as part of a safe launch and arming
sequence.
9.1.5 Flight Phase 4
( < t + t ) ∧ ( P&
≥ V ) ⇒ LAUNCH : = 3
t L F
o,
m S
Equation 9.1-4
The missile manoeuvres in response to lateral acceleration demands whilst
boosting.
( < t + t ) ∧ ( t > t ) ∧ ( P&
≥ V ) ⇒ LAUNCH : = 4
9.1.6 Flight Phase 5
t L B
B F
o,
m S
Equation 9.1-5
Boosting is complete and coasting mid-course guidance is established.
9.1.7 Flight Phase 6
t ≥ t L + t B ⇒ LAUNCH
: =
5
Equation 9.1-6
Seeker activation (tTG) seconds after launch resulting in target acquisition. In
conventional engagements this would indicate a transition from mid-course
to terminal guidance.
9.2 Performance Metrics
t ≥ tTG
⇒ LAUNCH : =
6
Equation 9.1-7
The performance metrics used are miss distance, impact speed, impact time,
and control effort, denoted by PIM, PIS, PIT and PIE respectively. The first
three are self-explanatory. The effort metric is dependent on the demanded
missile lateral acceleration that is closely linked to the energy expended,