This section presents guidance to field personnel performing GPS surveys for DOT projects. The primary emphasis in this chapter is on static, and real time kinematic (RTK) GPS measurements. The followi.
When should I use a base and Rover survey?
Overview: Use a Base and Rover survey when the cellular data signal is not strong enough for a reliable connection. an OPUS data collection and processing, and post survey adjustment. Use the Base w/ radio to send a signal to the Rover. (This can be done prior to setting up the survey equipment.)
How many control stations should a survey have?
The actual survey should have at least one horizontal control station in three of the four quadrants. Each of them ought to be as near as possible to the project boundary. Supplementary control in the interior of the network can then be used to add more stability to the network.
How does a base station work?
A base station consists of a receiver that is placed at a known (and fixed) position. The receiver tracks the same satellites that are being tracked by the rover receiver, at the same time that the rover is tracking them.
What is base station operation?
This topic introduces the concept of base station operation, provides information to help you identify good setup locations, describes best practices for setting up the equipment, and outlines the precautions that you need to take to protect the equipment.
When should a station data sheet be prepared?
The station data sheet can be prepared at any period of the project, but perhaps the most usual times are during the reconnaissance of existing control or immediately after the monumentation of a new project point.
Should a GPS/GNSS surveyor visit a station?
Even though there is usually not a moment to spare in moving from station to station, a GPS/GNSS surveyor frequently does not have the benefit of having visited the particular points before. In such situations, the clear marking of both the route and the station during reconnaissance is vital.