Guidance and Control Principles

1
Guidance and Control Principles

• Naval Weapons Systems

2
Objectives

• Comprehend the purpose and function of a control
  system
• Know the three phases of guidance
• Comprehend how control, homing and self-contained
  guidance systems are utilized singularly and
  together to direct missiles to their intended
  target.
• Comprehend the basic operation of accelerometers.
• Comprehend preset and variable flight paths.

3
Control Flight Path
Purpose To get the missile from launch to
target and ensure it performs properly during its
flight.
Function Every missile guidance system contains
an attitude and flight path control system.
Attitude Acts as auto pilot to maintain
altitude Controls pitch, roll
and yaw. Flight Path Determines flight path to
get to the target and generates
orders to attitude
control. Works on the principle of feedback.
4
Three Phases of Guidance
Boost Mid-Course
Terminal
5
Categories of Guidance Control

• Control (friendly control points)
• Command Guidance (radar track/ RF command)
• SM-2 mid, MK-48 wire
• Beam rider
• Homing (reacts to target)
• Active terminal-TASM,Harpoon,Pheonix MK-46/48
  torp
• Semi-Active mid-Pheonixterm-SM-2 MR, Sparrow
• Passive infra-SLAM,Sidewinder,rad-HARM,accoustic
  -MK-46/48
• Self Contained (self guided)
• Preset mid-TASM,Harpoon,Pheonix,AMRAAMMK-46/48
  
• Inertial Trident, TLAM in the beginning of
  midcourse
• Terrestrial TLAM- end of mid and terminal
• Celestial Trident

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CONTROLCommand Guidance System
Computer
7
CONTROL Beam Rider Control Guidance
Older method of guidance control.
Tracking Beam
Narrow Guidance Beam
8
Homing Guidance Control
Reflected Waves
Reflected Waves
Target Characteristic
Radar
Radar
2. Semi-Active
3. Passive
1. Active
9
Self-Contained Guidance Systems

• Preset
• Path is predetermined inserted into the weapon.
• Inertial
• Senses weapons movement and make adjustments.
• Terrestrial
• Compares actual terrain with predicted and
  adjusts.(TERCOM,DSMAC)
• Celestial
• References position to fixed stars and adjusts.

10
Guided Flight Paths

• Preset
• Constant
• Fixed before launch.
• Once launched, profile can not be changed
• Programmed
• Weapons has several programmed phases
• Variable
• Pursuit
• Constant Bearing
• Proportional Navigation
• Line-of-Sight (being phased out)

11
Pursuit Path
Points the target at all times.
12
Constant Bearing Path
X
Initial Target Path
Intercept Point
New Path
Constant Bearing Path
13
Proportional Navigation
Initial Range
14
Putting It All Together
15
Homework 11

• Read Chapter 16 Weapons Propulsion and
  Architecture
• Workbook Ch. 15 1,2
• Describe the categories of guidance control
• List 4 types of self contained guidance
• Describe the 4 types of variable guided flight
  paths.