Introduction
Constraint Based Geolocation (CBG) technique takes multiple landmarks as input to plot circles and identify possible regions of intersection of these circles. CBG technique uses its algorithm to convert delay to distance before plotting the circles. We modified CBG to produce a separate output file in the following format for each target. Each line indicates a different landmark with its latitude, longitude and distance from target. These values are separated by white-space. It is important to mention here that landmarks for each target were sorted beforehand on the basis of delay. Moreover landmarks with erroneous delay measurements were eliminated. This is done to consider those landmarks that are closer to a target in order to calculate a better estimate position for a target.
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target-IP actual-lat actual-long estimated-lat estimated-long error-distance |
Procedure to create CBG with Apollonius CSV file
The output from CBG with Apollonius code is copied to a CSV file and the columns are re-arranged using a spreadsheet tool (such as Microsoft Excel). The format of the file is shown below.
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