Javad Maxor, Руководство пользователя

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www.javad.com Maxor User’s Manual 3-7
S E T U P A N D S U R V E Y
Surveying with the Maxor
Surveying with the Maxor
The Maxor receiver can be used to perform the following types of surveying:
• Static
• Kinematic
• Real-time kinematic (RTK)
Static Survey
Static surveying is the classic survey method, well suited for all kinds of
baselines (short, medium, long). At least two receiver antennas, plumbed over
the survey marks, simultaneously collect raw data at each end of a baseline
during a certain period of time. These two receivers track four or more common
satellites, have the same data logging rate (5-30 seconds), and the same
elevation mask angles. The length of the observation sessions can vary from a
few minutes to several hours. The optimal observation session length depends
on the surveyor's experience as well as the following factors:
• The length of the baseline measured
• The number of satellites in view
• The satellite geometry (DOP)
• The antenna's location
• The ionospheric activity level
• The types of receivers used
• The accuracy requirements
• The necessity of resolving carrier phase ambiguities
Generally, single-frequency receivers are used for baselines whose lengths do
not exceed 15 kilometers (9.32 miles). For baselines 15 kilometers or greater,
use dual-frequency receivers.
Dual-frequency receivers have two major benefits. First, dual-frequency
receivers can estimate and remove almost all ionospheric effect from the code
and carrier phase measurements, providing much greater accuracy than single-
frequency receivers over long baselines or during ionospheric storms. Secondly,
dual frequency receivers need far less observation time to reach the desired
accuracy requirement.