WSF_INFRARED_SIGNATURE

infrared_signature WSF_INFRARED_SIGNATURE

infrared_signature <signature-name> (WSF_INFRARED_SIGNATURE)
   interpolate_tables <boolean-value>
   interpolation_type [linear | logarithmic]
   state <state-name> | default
      band [ short | medium | long | very_long | default ]
         ... Azimuth-Elevation Table Definition ...
      band ...
         ... Azimuth-Elevation Table Definition ...
   state ...
end_infrared_signature

Overview

WSF_INFRARED_SIGNATURE provides the standard implementation used by infrared_signature if the user did not specify a different implementation model. This model implements the signature as one or more sets of tables that apply when the platform is in a particular ‘state’. A ‘state’ represents a condition such as ‘bay-doors-open’.

The units for the dependent variable in the tables should be units of radiant intensity (W/sr).

<signature-name> is the name to be given to the signature. If the name specifies the name of an existing definition then the new definition will replace the current one (i.e. the last occurrence will be used for the simulation.)

Commands

interpolate_tables <boolean-value>

Specifies whether to apply interpolation to the defined Azimuth-Elevation Table Definition. The type of interpolation can be either linear or logarithmic (see interpolation_type).

Default true

interpolation_type <linear | logarithmic>

Specifies whether to use linear or logarithmic interpolation when interpolating data in the azimuth elevation tables.

Default linear

state <state-name>

Indicates that the following table definition will be used when the platform is in the signature state <state-name>. If <state-name> is default then the subsequent table will be used if the platform is in a signature state that does not match any of the states defined in the signature.

If a state command is not specified then the signature has one signature table that applies to all signature states.

band [ short | medium | long | very_long | default ]

Indicates that the following table will be used when the sensing infrared sensor is operating with the specified band. Where:

short:

1 to 3 microns

medium:

3 to 8 microns (3 to 5 nominally)

long:

8 to 14 microns

very_long:

14 microns and beyond

Every state must define every band or must define a default band.

Examples

Use a constant signature named cueball for all states and bands:

infrared_signature cueball
   constant 10 w/sr
end_infrared_signature

Use a band-dependent signature by default and a fixed signature if the bay doors are open:

infrared_signature dummy
   state default
      band medium
         constant 10 w/sr
      band default
         constant 20 w/sr
   state bays_open
      constant 30 w/sr
end_infrared_signature