Coordinate Systems
Nova supports two coordinate systems: North-East-Down (NED) and East-North-Up (ENU). By default the system is configured to use the ENU Cartesian coordinate system since Nova’s underlying architecture is ENU based. CIGI standard dictates that the NED coodinate system be supported so that can be easily configured.
North East Down (NED) Coordinate System
To enable the NED coodinate system for incoming and outgoing CIGI messages, the user needs to add the following token to the config_host_if_cigi.cfg file
Token Name | Default Value | Range and Description |
|---|---|---|
CoordinateSystem | ENU | ENU, NED Specifies the coordinate system used by the CIGI dll |
East North Up (ENU) Coordinate System
No configuration is necessary to use this coordinate system. The CoordinateSystem token defaults to ENU if it is not explicitly defined.
Ownship Heading Orientation
In Nova, the heading angle of the ownship is oriented as shown in the following diagram, with positive changes in the heading angle moving the eyepoint to the left.
To enable positive counterclockwise orientation, the TrueHeading token should be added to the config_host_if_cigi.cfg file.
TrueHeading ONAdding this token will support incoming and outgoing heading values where the clockwise direction is positive.