MAGNET Field: Localization

How to perform a multi-point GNSS localization using MAGNET Field.

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MAGNET Field: Localization

Definition

Localization is a process of matching GPS coordinates with the local jobsite coordinates. GPS Lat-Long-Height measurements are made on known x-y-z positions on the jobsite, and the two coordinate systems are matched.

Prerequisites

Licensed version of MAGNET Field
A new job created
Define a non state plane coordinate system
Set the coordinate type to ground

Import or enter a minimum of 4 control points that encompass the whole job site

Setup

Connect to base receiver (via cable or Bluetooth)
Select Setup >> Start Base

An assumed base is going to be used for this exercise
Enter in the assumed base name
Enter the base receiver height
Select highlighted measurement button to get current GNSS position from base receiver

Select highlighted 'Stop' button to quit measuring current base position and hold the autonomous GNSS values from the base receiver.

Select Start Base

Connect to rover receiver (via cable or Bluetooth)
Select Setup >> Localization

Select 'Settings' button to configure survey collection settings
Increase the number of Average measurements to 30 epochs or more. The more averaged measurements taken results in tighter overall residuals
Make sure to check Auto Store to automatically store the measurement after the desired number of averaged measurements is met
Select green checkmark button in the upper-right to save the settings and exit

Localization Process

Select Add to add the first point to the localization

Select Use H and/or Use V to hold the point as horizontal and/or vertical control
Enter the Known Point or select it from the Map View or List View
Name the Measured Point
- Often a good idea to give the measured point name a prefix of GPS to make associating the known and measured points easier
Enter the rover antenna height
Select the measure button in bottom-right to record GNSS values for the control point
Select green checkmark button in upper-right to save

Repeat steps for each additional control point
- A minimum of 4 points are needed for horizontal and vertical in order to create redundancies and perform statistical analysis, resulting in residual values.
Review horizontal and vertical residuals to see if desired standards are met.

Select Details to view localization parameters, if desired

Quality Control

Select Stake >> Points
Stakeout a control point to verify the accuracy of the calculated localization