WSF_ALPHA_BETA_FILTER¶

filter WSF_ALPHA_BETA_FILTER¶

filter <name> WSF_ALPHA_BETA_FILTER
   ... Commands ...
end_filter

Overview¶

Defines an alpha-beta filter for filtering tracks.

Commands¶

alpha <value>¶

Defines the filter’s alpha (position) parameter.

Default: 0.0

beta <value>¶

Defines the filter’s beta (velocity) parameter.

Default: 0.0

debug¶: Writes debugging information to the standard output.

Methodology¶

The alpha-beta filter operates using the following algorithm:

$X_f = X'_p + \alpha \times (X_m - X'_p)$

$V_f = V'_f + \frac{\beta}{dT} \times (X_m - X'_p)$

$X_p = X_f + dT \times V_f$

Where:

$\alpha$

The value of alpha

$\beta$

The value of beta

$X_m$

The measured position

$X_f$

The filtered position

$X_p$

The predicted position

$V_f$

The filtered velocity

$dT$

The time since the last filter update

The primed values are the filtered values from the last filter update.

WSF_ALPHA_BETA_FILTER¶

Overview¶

Commands¶

Methodology¶

Core Apps

Demos

Mystic

Warlock

Wizard

EVT Reader

Mover Creator

This Page

$\alpha$	The value of alpha
$\beta$	The value of beta
$X_m$	The measured position
$X_f$	The filtered position
$X_p$	The predicted position
$V_f$	The filtered velocity
$dT$	The time since the last filter update