Kalman GPS Smoothing Filter
This operator applies a Kalman filter to a position variable to smooth the cruise track.
Echoview accepts a position variable as input.
Settings
The Kalman GPS Smoothing Filter Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:
Operands page
Kalman Smoothing page
This page allows you to enter the settings that will be used to create a smoothed cruise track. The smoothing algorithm only uses good GPS fixes, bad fixes are not considered.
The Smoothing statistics section displays Kalman smoothing statistics.
After changes have been made to the Kalman Smoothing or Data pages, the statistics are displayed as not available ("n/a") until the changes are applied by clicking Apply or OK.
Settings |
Description |
Smoothing slider |
Selects degree of smoothing that is applied. Hint: To view the cruise track that is created from a specific smoothing setting: arrange the cruise track window and Variable Properties dialog box so both windows are visible; move the slider to the required position; then click Apply and observe the changes in the cruise track. Notes:
|
Expected standard deviation of GPS error |
Shows the standard deviation of GPS error value currently being used by the smoothing algorithm. The value is determined by the position of the slider and cannot be altered in this box. |
Algorithm
Processing and smoothing cruise tracks for more details.