.. _scenarioDragSensitivity:

scenarioDragSensitivity
=======================

Overview
--------

This script executes a parametric analysis of the control law examined in :ref:`scenarioDragRendezvous`,
considering the performance of that control
law across both increasing initial displacements and variations in atmospheric density.

This script is found in the folder ``src/examples`` and executed by using::

      python3 scenarioDragSensitivity.py

The simulation layout is identical to that used in :ref:`scenarioDragRendezvous`. The simulator used in
that scenario is run using a grid
of true anomaly offsets and atmospheric densities using Python's multiprocessing library, and a
set of surface plots reflecting the controls' terminal performance
and trajectories are produced.

Illustration of Simulation Results
----------------------------------

In this scenario, the differential drag scenario used in :ref:`scenarioDragRendezvous` is examined
across a range of initial along-track orbit offsets and atmospheric densities.
The resulting Hill-frame trajectories corresponding to every fifth simulation run are shown in the following image.

.. image:: /_images/Scenarios/scenarioDragSensitivity_hillTrajectories.svg
   :align: center

To visualize the sensitivity of terminal position and velocity errors to both increasing baseline and
variations in density, the following surface plots - which show the
scale of terminal errors as a function of atmospheric density and maneuver baseline - are shown below:

.. image:: /_images/Scenarios/scenarioDragSensitivity_positionSensitivity.svg
   :align: center

.. image:: /_images/Scenarios/scenarioDragSensitivity_velocitySensitivity.svg
   :align: center