14.02.2013 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Chapter 9 / Performance<br />

_ _<br />

9.1 Air-to-Air Engagement Scenario<br />

Figure 9-1 shows an event sequence that is typical for a surface-to-air<br />

engagement. These reflect the key processes involving all the simulators<br />

described in this document: target and sensor simulation, target tracking,<br />

trajectory optimisation, missile launch and state observation. Conventional<br />

missile guidance and target observer tuning presented in this chapter use the<br />

complex and idealised target trajectories designed for the purpose.<br />

0<br />

START TARGET TRACKING<br />

5<br />

START TRAJECTORY OPTIMISER<br />

TIME ( seconds )<br />

COMMIT TO LAUNCH<br />

RUN UP MISSILE IMU<br />

25<br />

LAUNCH<br />

30 30.1<br />

MISSILE ROTATION ENABLED<br />

FULL FIN DEFLECTION<br />

9-3<br />

BOOST COMPLETE<br />

34<br />

ENGAGE TERMINAL GUIDANCE<br />

SEEKER ENGAGE<br />

Figure 9-1 : Surface-to-Air Simulation Scenario<br />

IMPACT<br />

The times quoted in Figure 9-1 are approximate. The missile launch time is<br />

fixed at 30 s rather than optimally selected using the trajectory optimiser.<br />

The radar measurements are processed by the target state observer from the<br />

start at time (t := 0 s).<br />

TIME<br />

=<br />

0.0<br />

PRE-LAUNCH DATA FUSION AND TRAJECTORY OPTIMISATION<br />

LAUNCH & MOTION CONSTRAINED BY LAUNCHER<br />

LAUNCH = 0 LAUNCH = 1 LAUNCH = 2<br />

TIME<br />

=<br />

T_LAUNCH<br />

PX_MOM<br />

><br />

TUBELN<br />

UNCONTROLLED MISSILE MOTION ROTATIONALLY CONSTRAINED<br />

V_OM<br />

><br />

VSTABL<br />

UNCONSTRAINED AND UNCONTROLLED MISSILE<br />

LAUNCH = 3 LAUNCH = 4<br />

TIME<br />

><br />

TULOCK<br />

TIME ><br />

T_LAUNCH +<br />

T_BOOST<br />

MISSILE MID-COURSE<br />

COAST PHASE GUIDANCE<br />

MISSILE TERMINAL<br />

GUIDANCE<br />

LAUNCH = 5<br />

Figure 9-2 : Missile Launch sequence<br />

FINAL<br />

TRANSITION<br />

TO PN<br />

LAUNCH = 6<br />

40<br />

UNCONSTRAINED AND CONTROLLED MISSILE BOOST<br />

IMPACT

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!