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

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Chapter 2 / Target Modelling _ _ 2.4.4 Weave Motion This trajectory is a characterised version of Target Trajectory 7 with motion constrained to the horizontal plane with an initial state, T ( ( ) ) T T 16 _ 000 , 0 , 0 , 300 , 0 X : = − 2-14 5 Equation 2.4-7 After 3 s of constant velocity flight, the acceleration demand is set to, [ [ ( ) T TV 36 , 41 ⇒ A : 0 , 64 , 64 t ∈ = D Equation 2.4-8 The resulting weave is not monochromatic since low frequency PN is applied to ensure that the target motion is predominantly about X A . 2.5 Target Trajectories for Performance Assessment Target trajectories 3 (fly-past with dog-leg) and 7 (weaving) were selected to assess guidance law and state observer performance. 2.5.1 Target Trajectory 3 - Definition For guidance studies, a 400 m/s constant velocity, crossing target, with a 9 g avoidance manoeuvre applied normal to its velocity vector equally allocated between yaw and pitch, activated when the missile is 2 s from impact. For tracking studies, the missile is not launched and the manoeuvre is extended, starting after 37 s using the following demanded acceleration profile. TV [ 0 , 37 [ ⇒ AD : 03 t ∈ = Equation 2.5-1 At 37 s the target turns away from the missile launcher, diving from an altitude of 5 km to some 3 km to add to the radar clutter, P & ≤ −100 ⇒ A : = XA t TV D ( ) T 0 , 64 , 64 Equation 2.5-2 As the turn develops and the velocity of the target parallel to X A increases the target climbs at 9 g until it is climbing at 60°.
Chapter 2 / Target Modelling _ _ ⎧ ⎪ ⎪ ⎨ ⎪ ⎪ ⎩ ⎛ TV π ⎜ ΘA ≤ ⎝ 3 ⎞ ⎟ ⎠ ⎛ TV π ⎜ ΘA > ⎝ 3 XA ( P > −100 ) & ⇒ 2.5.2 Target Trajectory 7 - Definition t ⎞ ⎟ ⎠ 2-15 A TV D ⇒ : = A T TV D ⇒ TV A ⋅ : = ( 0 , 0 , 90 ) 0 3 T ⎫ ⎪ ⎪ ⎬ ⎪ ⎪ ⎭ Equation 2.5-3 A 0.5 g accelerating PN attack against the launcher with a superimposed weave with a frequency of 0.25 Hz. 2.5.3 Target Trajectory Characteristics The 3D trajectory, and the range, speed, bearing and elevation for these two trajectories are shown in Figure 2-2 to Figure 2-7. The impact points shown on these figures are based on a missile PN trajectory launched at 30 s. The data is contained in files TGT_003 (blue trace) and TGT_007 (red trace). Both targets fly straight and level for the first 37 s at a constant speed of 400 m/s before any acceleration profiles are initiated. Low pass filters are applied to the acceleration demands with longitudinal and lateral time constants of 0.3 s and 0.5 s respectively. 2.6 Discussion The target simulator is common to the other simulators supported by the program infrastructure. This simulator is not so much isolated, as the others are deactivated leaving only target trajectory generation. The target models, being relatively simple, generate trajectory data from the PVA states at the simulation reference rate so as to appear as “continuous” to the sensor simulator. Default target characterisation is provided in respect of the physical dimensions and dynamic capabilities of military aircraft for glint modelling. Although military aircraft appear to come in all shapes and sizes they do in fact fall into distinct categories with relatively small variances. Typical dimensions are provided for fighters, trainers, helicopter and bombers. The target models focus on motion in the Earth fixed Alignment frame provided that is a reflection of the air-launched application. Three target classes are established during program initialisation depending on user input data: stationary, head-on and crossing. The stationary case is often ignored however, it is relevant for land fixed targets, helicopters and vertically launched aircraft.
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CRANFIELD UNIVERSITY LEIGH MOODY SE
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ABSTRACT When considering advances
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Contents _ _ LIST OF CONTENTS 1 INT
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Contents _ _ 8.2 The Scope of Moder
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Contents _ _ 17.4 Inertial Velocity
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Tables _ _ LIST OF TABLES Table 1-1
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Figures _ _ LIST OF FIGURES Figure
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Figures _ _ Figure 5-1 : Centralise
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Figures _ _ Figure 19-3 : Air Densi
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Acronyms _ _ Acronyms And Abbreviat
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Acronyms _ _ HDOP - NAVSTAR GPS Hor
Page 27 and 28: Acronyms _ _ RCS - Radar Cross Sect
Page 29 and 30: Glossary _ _ GLOSSARY A challenge w
Page 31 and 32: Glossary _ _ 0.1 Predicate Calculus
Page 33 and 34: Glossary _ _ ]A,B] Real number rang
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Page 37 and 38: Glossary _ _ 0.14.2 Special Vectors
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Chapter 3 / Sensors / Radar _ _ 3.8
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Chapter 3 / Sensors / Radar _ _ LF
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Chapter 3 / Sensors / Radar _ _ ( )
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Chapter 3 / Sensors / Radar _ _ S :
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Chapter 3 / Sensors / Radar _ _ ⎛
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Chapter 3 / Sensors / Seeker _ _ 3.
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Chapter 4 / Target Tracking _ _ 3.1
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Chapter 4 / Target Tracking _ _ Ine
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Chapter 5 / Missile State Observer
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5 Chapter 5 / Missile State Observe
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6 Chapter 6 / Missile Guidance _ _
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Chapter 6 / Missile Guidance _ _ 6.
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Chapter 6 / Missile Guidance _ _ As
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Chapter 6 / Missile Guidance _ _ CD
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Chapter 6 / Missile Guidance _ _ ge
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Chapter 6 / Missile Guidance _ _ ex
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Chapter 6 / Missile Guidance _ _ &
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Chapter 6 / Missile Guidance _ _ PN
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Chapter 6 / Missile Guidance _ _ of
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Chapter 6 / Missile Guidance _ _ NO
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Chapter 6 / Missile Guidance _ _ η
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7 Chapter 7 / Missile Trajectory Op
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Chapter 7 / Missile Trajectory Opti
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8 Chapter 8 / Simulation _ _ Chapte
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Chapter 8 / Simulation _ _ 8.1 The
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Chapter 8 / Simulation _ _ 8.3 The
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Chapter 8 / Simulation _ _ Having p
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Chapter 8 / Simulation _ _ 8.5.1 Gl
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Chapter 8 / Simulation _ _ (1) CONS
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Chapter 8 / Simulation _ _ 8.6.2 Ou
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Chapter 8 / Simulation _ _ The file
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Chapter 8 / Simulation _ _ • The
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Chapter 8 / Simulation _ _ comprehe
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Chapter 8 / Simulation _ _ WIN_RATE
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Chapter 8 / Simulation _ _ for this
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Chapter 8 / Simulation _ _ with the
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Chapter 8 / Simulation _ _ Figure 8
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Chapter 8 / Simulation _ _ Table 8-
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Chapter 8 / Simulation _ _ 8.8 Disc
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9 Chapter 9 / Performance _ _ Chapt
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Chapter 9 / Performance _ _ 9.1 Air
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Chapter 9 / Performance _ _ XM ( >
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Chapter 9 / Performance _ _ 9.3 PN
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Chapter 9 / Performance _ _ The eff
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Chapter 9 / Performance _ _ VXMVOM
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Chapter 9 / Performance _ _ VXMVOM
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Chapter 9 / Performance _ _ 9.4 CLO
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Chapter 9 / Performance _ _ AR_BOM
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Chapter 9 / Performance Chapter 9 /
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Initially the position error falls
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values of CN are not always a relia
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crude initialisation introduces err
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9.5.3 Singer Filter Tuning The Sing
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9.6.2 CLOS Study The CLOS study sho
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Chapter 10 / Conclusions _ _ 10-2
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Chapter 10 / Conclusions _ _ 10.3 T
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Chapter 10 / Conclusions _ _ 10.7 M
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Chapter 11 / Future Research _ _ 11
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Chapter 11 / Future Research _ _
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Chapter 11 / Future Research _ _ To
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References _ _ B.4 BAZARAA M.S., SH
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References _ _ F.1 FOX J.E., “A C
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References _ _ H.5 #HULL D.G., RADK
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References _ _ L.2 LOOZE D.P., HSU
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References _ _ N.4 NABAA N., BISHOP
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References _ _ R.3 RUSNACK I., “O
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References _ _ S.15 SINGER R.A.,
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References _ _ Y.2 YUAN P., CHERN J
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Bibliography _ _ B.13 BABA Y., YAMA
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Bibliography _ _ B.40 BECKER J.C.,
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Bibliography _ _ C.33 CORTINA E., O
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Bibliography _ _ E.8 ERSHOV A.A.,
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Bibliography _ _ G.34 GUTMAN P., VE
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Bibliography _ _ H.35 HUSSAIN A.M.,
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Bibliography _ _ K.14 KATZIR S., CL
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Bibliography _ _ L.19 LEFAS C.C,
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Bibliography _ _ M.16 MAYNE D.Q., P
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Bibliography _ _ P.1 PAINTER J.H.,
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Bibliography _ _ R.32 RONG LI X., Z
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Bibliography _ _ S.47 SPEYER J.L.,
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Bibliography _ _ V.5 VIAN J.L., MOO
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Bibliography _ _ W.29 WATSON G.A.,
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Appendix A / Geometric Points _ _ 1
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Appendix A / Geometric Points _ _ 1
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Appendix B / Frames of Reference _
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Appendix C / Axis Transforms _ _ 16
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Appendix C / Axis Transforms _ _ YP
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Appendix C / Axis Transforms _ _ B
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Appendix C / Axis Transforms _ _ YB
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Appendix C / Axis Transforms _ _ Us
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Appendix C / Axis Transforms _ _ No
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Appendix C / Axis Transforms _ _ B
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Appendix C / Axis Transforms _ _
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Appendix D / Point Mass Dynamics _
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Appendix E / Earth Geometry _ _ 18-
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Appendix E / Earth Geometry _ _ ELL
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Appendix E / Earth Geometry _ _ (dx
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Appendix E / Earth Geometry _ _ Int
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Appendix E / Earth Geometry _ _ 18.
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Appendix E / Earth Geometry _ _ 19-
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Appendix E / Earth Geometry _ _ P S
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Appendix E / Earth Geometry _ _ 19.
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Appendix E / Earth Geometry _ _ ∂
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Appendix G / Gravity _ _ 20-2
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Appendix G / Gravity _ _ g : = g +
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Appendix G / Gravity _ _ d −6 2
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Appendix G / Gravity _ _ 20-8
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Appendix H / Steady State Tracking
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Appendix I / Utilities _ _ 22.1-2
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Appendix I / Utilities _ _ Cartesia
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Appendix I / Utilities _ _ Matrix P
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Appendix I / Utilities _ _ 22.1-8
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Appendix I / Utilities / WGS 84 Tar
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Appendix I / Utilities / Point Mass
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Appendix I / Utilities / Earth, Atm
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Appendix I / Utilities / Quaternion
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