Navigation can be required in land, air and water or in sea. Everyplace navigation
can be provided with some modification in the process of getting the data and
way of processing of data and accuracy of the data required for each purpose.
Navigation in Land
GPS improves efficiency on land as well. The capabilities of satellite navigation,
when coupled with communications and modern computerized management
systems can help meet many of the transportation challenges facing all modes of
surface transportation.
Currently, it is being used to add a new dimension for automatic vehicle location
and in-vehicle navigation systems. GPS helps motorists find their way by showing
their position and intended route on dashboard displays.
The NAVSTAR and GLONASS systems use the principle of trilateration. That is,
the user’s receiver determines the distance from the user to each of several
satellites. Since the positions of the satellites are known, either through previous
publication or as part of the satellite’s broadcast information, the user’s position
can be calculated.
Display of the position of the vehicle can be taken on an instrument of a size of a
mobile phone or palmtop. A central monitoring station or service providing
central station can observe the position. The various services that can be
provided by the central monitoring station can be as follows:
• when emergency assistance is required, that can be in a stage of health
problems, lost of way.
• In a search of facilities in a highway such as public conveniences or
restaurant etc.
• Search of a route that is short, less congested and that will touch the
required places or facilities in need.
• As long as technology helps, as the navigation facilities will reach to a
point, at which when vehicles will become smart vehicle, which is self-
driven vehicles. In which we have to give only the destination then sit a
back, read newspaper or talk on a phone, vehicle will take us to our
destination.
• GPS integrated with VHF and HF radios are being offered to Army, Navy
and Air force. It aids the soldier in navigating without the help of a map
and automatic reporting of the position of the troop to control station.
• Silent Feature of GPS
• 24 satellites
• 6 orbital planes
• 55 ° inclination
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