Measuring With The Prego; Static Measuring - Javad Prego Operator's Manual

S E T U P A N D M E A S U R I N G
3

Measuring with the Prego

10. When finished, press and hold the FN key until the REC LED light goes
11. Press and hold the power key until all lights go out, then release.
Measuring with the Prego
The Prego receiver can be used to perform the following types of measuring:
• Static (see "Static Measuring" on page 3-6)
• Kinematic (see "Kinematic Measuring" on page 3-8)
• Real-time kinematic (RTK) (see "Real-time Kinematic Measuring" on
page 3-12)

Static Measuring

Static measuring is the classic measuring method, well suited for all kinds
of baselines (short, medium, long). At least two receiver antennas, plumbed
over the measuring 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 user's experience as well as the following
factors:
Generally, single-frequency receivers are used for baselines with lengths 15
kilometers (9.32 miles) or less. For baselines 15 km or greater, use dual-
frequency receivers.
Dual-frequency receivers have two major benefits. First, dual-frequency
receivers can estimate and remove almost all the ionospheric effect from the
3-6 Prego Operator's Manual
out.
• The length of the baseline measured
• The number of satellites in view
• The satellite geometry
• The antenna's location (DOP)
• The ionospheric activity level
• The types of the receivers used
• The accuracy requirements
• The necessity of resolving carrier phase ambiguities
www.javad.com