JDAM using GPS

Joint Direct Attack Munition (JDAM)
Using
Global Positioning System (GPS)
3/30/2015 1
BY :-
Swagat Kumar Dash
1141016184
ECE – C
Swagat Dash

• Introduction
• Global Positioning System
Navigation Data
Position Calculation
Pseudo-random Noise
Trilateration
Mathematical Formulation of the Target Tracking
Differential GPS (DGPS)
• Guiding Mechanism
Inertial Navigation System (INS)
JDAM Tail Kit
GPS Adapter Kit (GAKs)
Missile Profile
• Advantage & Disadvantages.
• Future Scope
• Conclusion
• References3/30/2015 2Swagat Dash

• GPS is the shortened form of NAVSTAR GPS. This is an acronym for Navigation
System with Time And Ranging Global Positioning System.
• Guided missile is a self propelled, pilotless controlled flight vehicle that is
guided to its target by GUIDANCE.
• GPS Guided bombs using a low cost Joint Direct Attack Munition kit that
enables FIRE-&-FORGET mechanism .
• It uses Inertial Measurement System (IMS) & GPS which monitors the
weapon’s location and altitude to adjust its flight path.
• Our main aim is to know how GPS is used TO GUIDE THE MISSILE !
3/30/2015 3Swagat Dash
[6]

$GPGGA,100156.000,2650.9416,N,07547.8441,E,1,08,1.0,442.8,M,-42.5,M, ,0000*71
EPHEMERIS DATA
ALMANAC DATA
NAVIGATION DATA
• Contains Orbital Information and Status of visible satellites.
• GPS receiver uses this data to determine which satellites it
expects to see in the local sky.
• It contains the precise Orbital Information of its own.
• Tells GPS receiver where each GPS satellite should be at
any particular time throughout the day.

T + 3
Then distance between satellite
and receiver = “3 times the speed
of light” [d = v t]
T
Radio waves travel at the speed of light.
Position is Based on Time
[5]
[5]

• The GPS receiver and satellite generate the same pseudo-random code at
exactly the same time. When the code arrives from the satellite, the time
difference is compared to the same code generated by the receiver.
PSEUDO-RANDOM NOISE

• The orbits are arranged so that at anytime,
anywhere on Earth, there are at least four
satellites "visible" in the sky.
• GPS is a constellation system that tracks
anyone on the EARTH any time in any
weather.
Global Positioning System
No. Of Axis  6.
TOTAL  29 Earth orbiting satellite.
Operational  24.
A Day  2 complete rotation.
Above Surface  19,300km

The receiver is
somewhere on this
sphere.
Signal From One Satellite
Signals From Two Satellites
Three Satellites (2D Positioning)3/30/2015 8Swagat Dash
[6]

Mathematical Formulation of the Target Tracking
The equation of these spheres can be
represented by equations given as:
This eliminates the quadratic terms in x, y and z and leads to the following set of
non-homogenous linear equations in x, y and z:
[4]

Differential GPS (DGPS)
[4]

Inertial Navigation System (INS)
Technique in which measurements provided by rotational sensors and motion sensors
are used to track the orientation and position of an object relative to a known starting
point, orientation and velocity without communicating with a base station.
Single Device with a control mechanism
Gyroscope Accelerometer
Inertial
Navigation
System
3/30/2015 11Swagat Dash[4]
Accelerometer Operation

3/30/2015 Swagat Dash 12
Gyroscope operation

A KIT guided by an integrated Inertial guidance system (INS) coupled to a Global
Positioning System (GPS) receiver in the Tail Section.
[2] [6]
[6]

[2]
Battery

IMU -->
(Inertial Measurement Unit)
GPS Adapter Kit (GAKs)
[1]

[1] How JDAM deployed Practically(Missile Profile).
Jettision

Advantages
• LOW cost Guidance kit.
• Immune to bad weather condition.
• High-precision weapon for MASS DESTRUCTION.
• There is no need of ground team support for the attack.
Disadvantages
• Precision of weapons depend on the precision of measurement
system.
• It is possible to jam the GPS.
• They Require Smarter Complex Software Coding.

3/30/2015 18
In the future, the battlefield will actually exist inside a virtual world. There are
future projects in which military vehicles such as tanks are being outfitted with
GPS transmitters and other remote control devices so can vehicle can be piloted
by a human without the human physically present.
Swagat Dash
[5]
[4]

3/30/2015 19
Hence, it is conclude that how a unguided bomb can be converted
to a guided one with a low cost JDAM kit and as a result GPS guided
weapons with their technological advances over previous,
became the superior weapon of choice in modern day warfare
as it does not leave the gunner vulnerable for attack.
Swagat Dash

References
3/30/2015 20
[1] Deok-Bae Park, Dong-Ho Shin, Sang-Heon Oh and Hyung-Shin Kim, "Development of a
GPS/INS system for precision GPS guided bombs," Aerospace and Electronic Systems
Magazine, IEEE , vol.27, no.3, pg.31-39, March 2012.
[2] “GPS-Aided Navigation and Unaided Navigation on the Joint Direct Attack Munition”
by Harold A. Klotz, Jr. , Member, IEEE and Charles B. Derbak, Member, pg.412-419,
INSPEC Accession Number:6026641, IEEE Journal 2009.
[3] The Science and Technology Magazine “Digital Digest” Silicon Institute of Technology
vol.12 , Issue.3 , pg.6-12 , Aug-Oct 2013.
[4] Wikipedia (various articles).
[5] Britannica Encyclopedia .
[6] Web pages : http://www.slideshare.net/gps
http://www.aerospaceweb.org/weapons/JDAM/q0187.shtml
http://www.goolge.co.in
Swagat Dash

3/30/2015 21
Have a nice day !!
Swagat Dash

JDAM using GPS

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