Improved Sun Sensors Model

[kylekrol]

Improved Sun Sensors Model

Relates to #143.

Summary of changes

• Added single spherical angle noise model. This model is currently employed by the filter as well but will have to be updated as the model breaks down when the sun vector is near the z axis.
• Added a simple eclipse model. Note, the model must be enable for it to be active (see config file additions).

Testing

Some sample images taken with eclipse and without eclipse are included here.

With eclipse enabled:

Without eclipse enabled:

You can also see the more detailed behavior with a shorter time scale:

The above plots can be generated with the following command:

python -m psim -s 20000 -p sensors/sun_sensors -ps 1 -c sensors/base,truth/base,truth/deployment -v SingleAttitudeOrbitGnc

[kylekrol]

This needs to be rebased once #280 and #287 are merged.