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

Chapter 2 / Target Modelling
_ _
2.3.6 Target Trajectory 6: Accelerating PN Attack with Evasive Turn
TGT_SEL := 6 activates Target Model 2 starting from the same initial state
as Trajectory 5. The attack on the launcher is initiated after 5 s using Target
Model 5. If the missile is launched, this is replaced by Target Model 2 with
the following acceleration demand.
GO
AM
TV
D
t < t ⇒ A : = −
2-12
( ) T
5 , 64 , 64
Equation 2.3-12
If the missile is not launched, Target Model 2 is still activated but under the
following conditions,
[ [ ( ) T
TV
36 , 41 ⇒ A : = 5 , 64 , 64
t ∈
−
D
[ [ ( ) T
TV
41 , 46 ⇒ A : = 5 , 64 , 64
t ∈
−
D
Equation 2.3-13
Equation 2.3-14
After the avoidance manoeuvre, the 0.5 g accelerating PN attack is reestablished
using Target Model 2 prior to impact.
2.3.7 Target Trajectory 7: Accelerating PN Attack with Evasive Weave
TGT_SEL := 7 activates Target Model 2 starting from the same initial state
as Trajectory 5. After 5 s an attack on the launcher and ground radar is
initiated using Target Model 6 resulting in an accelerating PN attack with
the coning avoidance manoeuvre until impact.
2.4 Target Trajectories for IMM Filter Tuning
The target trajectories defined thus far use input data files, or pre-set data,
with IMM_TEST set to zero as shown in Figure 2-1. The individual IMM
target tracking filters are tuned using trajectories that are activated by setting
the following bits of IMM_TEST:
• Constant velocity ( bit 1 )
• Constant acceleration in the Alignment frame ( bit 2 )
• Stepped acceleration through a 1 st order lag ( bit 3 )
• Weave motion ( bit 4 )
The pre-set dynamics built into TG_IMM_TEST, once invoked, replace the
programmed target trajectories in TG_SELECTOR and cannot be altered by
the user. These test trajectories are characterised in the program using
demanded accelerations expressed in the Alignment frame before
conversion into the Target Velocity frame. The acceleration demands are