۶ This lets it calculate a much more accurate position than would be possible if the
uncorrected range measurements were used. Using this technique, all of the error sources
listed in section 3.1.3 are minimized, hence the more accurate position.

ഹ്‌ It is also worthwhile to note that multiple Rover Receivers can receive corrections from
one single Reference.

6. ( Three methods (5X3= 15)
The different methods are

1. Static survey

2. Rapid static survey

3. Kinematic survey
1. Static survey

This was the first method to be developed for GPS surveying. It can be used for measuring long baselines
(usually 20km (16 miles) and over). One receiver is placed on a point whose coordinates are known
accurately in WGS84. This is known as the Reference Receiver. The other receiver is placed on the other
end of the baseline and is known as the Rover. Data is then recorded at both stations simultaneously. It is
important that data is being recorded at the same rate at each station. The data collection rate may be
typically set to 15, 30 or 60 seconds. The receivers have to collect data for a certain length of time. This
time is influenced by the length of the line, the number of satellites observed and the satellite geometry
(dilution of precision or DOP). As a rule of thumb, the observation time is a minimum of | hour for a 20km
line with 5 satellites and a prevailing GDOP of 8. Longer lines require longer observation times.