GPS systems, capabilities and vulnerabilities

Discussion in 'Science and Technology' started by W.G.Ewald, Sep 15, 2013.

  1. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    C4I.org - 10 GPS Vulnerabilities by Lieutenant Colonel Thomas K. Adams, US Army, Ret.

    Dual Use and Vulnerabilities
    I take GPS for granted now for land travel and marine navigation. (Well, my Garmin nüvi needs to go back to the factory, but that's another story.)

    Obviously the military uses GPS, but what are the vulnerabilities especially if the the system is attacked by a hostile entity?

    I don't even know how many GPS systems there are and who controls them.
     
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  3. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    Global Positioning System
 Is a Single Point of Failure | SIGNAL Magazine

    GPS vulnerabilities could be addressed with upgraded long-range navigation.
     
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  4. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    Navigation and Timekeeping - Office of Naval Research

    GPS vulnerability mitigation:
     
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  5. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    Supervised Team Of College Hackers Expose GPS Vulnerability « CBS Dallas / Fort Worth

     
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  6. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    Military PNT — The Way Ahead | Inside GNSS
     
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  7. rojesh

    rojesh Regular Member

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    There are only two positioning systems are operational now GPS & Glonass, Few in developing stage. Although both the system work in the same principle, except each Glonass satellite transmit it's own frequency. This arrangement is known as FDMA Frequency division multiple access. while GPS use CDMA code division multiple access where each satellite is identified from it's C/A code in common frequency. The control segment includes satellite tracking station and master control station. satellite tracking stations located in different parts of the world tracks the satellite in view and relay the phase and range data to the master control stations. The master control station computes the orbital parameters of the satellite this data is uploaded back in the satellite. The data is included in the satellite navigational transmission in L1 & L2 frequencies. There are multiple tracking station and master control station in different locations redundancy is always maintained. Attacking Global Positioning System can not be done by one missile, unless if he destroys all the 24 satellite.
     
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  8. Armand2REP

    Armand2REP CHINI EXPERT Veteran Member

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    The greatest vulnerability of relying on GPS is that the US can turn it off anytime they want. The problem is there is no system to replace it. GLONASS is so horribly inaccurate Russian Marines land miles away from their LZ.

     
    Last edited by a moderator: May 10, 2015
  9. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    ^^
    Comments which follow the video claim that the beach is in fact a military training area and civilians there ignore restrictions on access.

    So the comment on GLONASS is Armand2REP just pulling our leg. :hehe:
     
  10. Armand2REP

    Armand2REP CHINI EXPERT Veteran Member

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    Komosomolskaya Pravda said the base the ministry was referring to was several miles away in Khmelevka, not Mechnikovo. :lol:

    Под Калининградом десантный корабль распугал отдыхающих // KP.RU
     
  11. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    Russian Navy hovercraft rams into crowded beach | Russia & India Report

     
  12. W.G.Ewald

    W.G.Ewald Defence Professionals/ DFI member of 2 Defence Professionals

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    On July 4th, 2012 I personally observed a USN LCAC come ashore on Niantic Beach in Connecticut, which was crowded with civilians at the time. Nobody thought it was a big deal, or thought a navigational system ad gone awry.

    [​IMG]
     
  13. rojesh

    rojesh Regular Member

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    We are using both GPS and Glonass system both systems have same accuracy ie 1.5 mtrs with differential corrections applied. Except Glonass has less satellite, but they are polar orbiting they have some advantage also. In any case If uncle SAM decides to turn off the GPS (which he can not) because there are more civil users now and he is also depending on GPS. He can increase the clock error but now there are more differential corrections available in different modes. So the chances are less. There are more regional networks available like India is still developing IRNS... which can be used in case if the GPS or Glonass fails.
     
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