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Global Positioning System- GPS

Discussion in 'Matangazo madogo' started by Pezzonovante, May 30, 2008.

  1. Pezzonovante

    Pezzonovante JF-Expert Member

    #1
    May 30, 2008
    Joined: May 1, 2008
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    Global Positioning System (GPS), space-based radio navigation system, consisting of 24 satellites and ground support, that provides accurate, three-dimensional position, velocity, and time, 24 hours a day, everywhere in the world, and in all weather conditions. Because the user does not communicate to the satellite, GPS serves an unlimited number of users.

    GPS is available in two basic forms: Standard Positioning Service (SPS) and Precise Positioning Service (PPS). SPS provides a horizontal position that is accurate to 100 m (109 yds). PPS horizontal accuracy is 20 m (22 yds). For authorized users, usually the US military and its allies, PPS also provides greater resistance to jamming and immunity to deceptive signals (antispoofing).

    . HOW GPS WORKS

    GPS Satellite A total of 24 US Global Positioning System (GPS) satellites orbit overhead and provide accurate positioning and navigation information for both military and civilian use. Solar cells power each satellite and its atomic clocks. Antennas on a satellite continuously transmit timing information from the clocks. The signals can be picked up and processed by a GPS receiver to determine exact location and altitude.The NAVSTAR Global Positioning System Joint Program Office

    GPS satellites carry atomic clocks that measure time to a high degree of accuracy. The time information is placed in the codes broadcast by the satellite so that a receiver can continuously determine the time the signal was broadcast. The signal contains data that a receiver uses to compute the locations of the satellites and to make other adjustments needed for accurate positioning. The receiver uses the time difference between the time of signal reception and the broadcast time to compute the range to the satellite. The receiver must account for propagation delays caused by the ionosphere and the troposphere. With three ranges to three satellites and knowing the location of the satellite when the signal was sent, the receiver can compute its three-dimensional position.
     
  2. M

    Mwikimbi JF-Expert Member

    #2
    May 30, 2008
    Joined: Mar 8, 2008
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    Asante Mkuu, Ebu Tuagizie Namna Ya Kupata Hii Kitu Na Bei Yake, Unajua Tulioko Huko Bongo Ingetusaidia Sana, Hasa Kwenye Field Yetu Ya Engineering, Inaweza Pia Ku=measure Horizontal Distances In High Accuracy
     
  3. Pezzonovante

    Pezzonovante JF-Expert Member

    #3
    May 30, 2008
    Joined: May 1, 2008
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    Zoombak GPS Car Locator
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    & Email About Your Car's Location.
    Zoombak.co.uk/CarLocator

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    Fleet Vehicle Tracking
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    Book FREE onsite demonstration NOW
    www.WheresMyFleet.com

    GPS Vehicle Tracking
    Web based GPS Vehicle Tracking
    Real time GPS Vehicle Tracking
    www.trackyou.co.uk
     
  4. Buswelu

    Buswelu JF-Expert Member

    #4
    May 30, 2008
    Joined: Aug 16, 2007
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    Hizi GPS(Global Positioning System) Ambazo ni ndogo za mkononi unaweza kutembea nazo...kama watu wa land & survey watakuwa nazo.

    Kisha kuna DGPS(Differential Global Positioning System (DGPS) hizi ni kubwa kidogo unaweka mgongoni wanatumia sana kwatu wa survey,mining,exploration..kwa ajiri ya kazi tofauti tofauti....

    Katika accuracy zinatofautiana hizi ndogo na kubwa....kwani ndogo inaweza kuwa accuracy yake ina tofauti ya 5meter kutoka kwenye point ya uhakika ambayo kwa DGPS tofauti tokwa kwenye point kamili ni one meter to 2 meter ambayo si mbaya sana.

    Kupatikana kwa tanzania sijui ni wapi ila south africa wanaziuza na kukodisha hizi DGPS na GPS.

    Kwa kuwa wao wana advance kwenye mambo haya....kama utapenda kupata yako ingawa ni bei ghali sana na inabidi uwe na kazi nayo ili iweze kukusaidia.
    Naweza kukupa link website na tell phone number ukawatwangia ukaona.

    Good day
    Buswelu
     
  5. Pezzonovante

    Pezzonovante JF-Expert Member

    #5
    May 30, 2008
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    OK, MKUU BUSWELU NASHAULI WEKW HIZO LINK PEUPE ILI WANANZENGO WAPATE KUPONA.
     
  6. Buswelu

    Buswelu JF-Expert Member

    #6
    May 30, 2008
    Joined: Aug 16, 2007
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    Haya wakuu contact hizo hapo...mnaweza kuwasiliana nao.

    Tel: 012 658 0652

    Fax: 012 658 0564

    Mobile: 084 686 2237


    Physical Address: Building 2, (Unit C2 & D2)

    Bondev Office Park, Cnr Willem Botha & Wierda Road, Eldoraigne Ext 48, Centurion, 0157

    Postal Address: P O Box 612, Milnerton, 7435
    Cape Town, South Africa
    Website: www.omnistar.co.za

    Hapo sasa PEZZONOVANTE AND Invisible.
     
  7. G

    Game Theory JF-Expert Member

    #7
    May 30, 2008
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    kwani Galileo bado?
     
  8. N

    Ngereja JF-Expert Member

    #8
    May 30, 2008
    Joined: Feb 27, 2007
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    GALILEO iko kwenye testing stage and will be fully operational by 2010. So far, there is more than one global navigation satellite systems, these are NAVSTAR GPS owned by US DoD, GLONASS (GLobal NAvigation Satellite System) owned by Russia, the Rusian system is merely for the Military application, and the Coming GALILEO of the European Union. Chinese government also operates their own navigation system.

    The three Systems (GPS, GLONASS and GALILEO) will be fully interoprable, hence increasing positional accuracy for civilian users. With Satellite systems, one can achieve an accuracy of up to millimetre level depending on positioning techniques used. mm accuracy can be achieved only with Geodetic receivers using differential or carrier phase measurements. With DGPS (with single geodetic receiver ) one can achieve a sub-metre and sub-centimetre accuracy.

    With hand-held GPS receiver, one can achieve 15 up to 100 metres accuracy.
     
  9. G

    Game Theory JF-Expert Member

    #9
    May 31, 2008
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    ile ofisi ya Galileo pale ATC bado ipo ?
     
  10. Mwiba

    Mwiba JF-Expert Member

    #10
    Jun 4, 2008
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    Hizi zinafanya kazi Tanga tu ambako mitaa ina nambari,sasa sehemu kama dar ambako hakuna namba kuna majina ya mitaa ,sidhani kama GPS itaweza kukwambia kata kushoto ila tanga inakuonyesha kabisa bara ya kwanza mpaka ya 21 karibu mgandini.
     
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