Remote Sensing
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چکیده
Global positioning system (GPS) is also known as Navigation System with Time and Ranging Global Positioning System (NAVSTAR) GPS. Originally designed for military purposes, GPS is being increasingly used by civilians for various applications like marine navigation, surveying, car navigation. Signals made available for civilian use, known as the Standard Positioning Service (SPS) can be freely accessed by general public. On the other hand, the more accurate Precise Positioning Service (PPS) can only be used by authorized government agencies. The development of GPS system was mainly aimed for these aspects:
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