GPS Surveying
Traditional methods of surveying and navigation
resort to tedious field and astronomical observation for deriving positional
and directional information. Diverse field conditions, seasonal variation and
many unavoidable circumstances always bias the traditional field approach.
However, due to rapid advancement in electronic systems, every aspect of human
life is affected to a great deal. Field of surveying and navigation is
tremendously benefited through electronic devices. Many of the critical
situations in surveying/navigation are now easily and precisely solved in short
time.
SEGMENTS OF GPS
For better understanding of GPS,
we normally consider three major segments viz. space segment, Control segment
and User segment. Space segment deals with GPS satellites systems, Control
segment describes ground based time and orbit control prediction and in User
segment various types of existing GPS receiver and its application is dealt .
Table 2 gives a brief account of the function and
of various segments along with input and output information.
Table 2. Functions of various segments of GPS
Figure
4.3: The Space, Control and User segments of GPS
GLONASS (Global Navigation &
Surveying System) a similar system to GPS is being developed by former Soviet
Union and it is considered to be a valuable complementary system to GPS for
future application.
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