Annie simulator framework

The annie package is a high-fidelity Chandra Aspect Camera Assembly (ACA) star tracking simulator developed with the goal of operational use within ACA load review and weekly planning, and PEA background subtraction patch algorithm development.

The annie package is designed to reproduce the key behavior of OBC Pointing Control and Aspect Determination (PCAD) and ACA subsystems. The package can be used to: simulate hardware (CCD characteristics, CCD dark current background), identify or reject stars, count glitches due to bad flags or lost stars, track stars (predict next image readout window location, and predict state transitions), update attitude based on a combination of star data and simple PCAD attitude law.

Annie requires the Ska runtime environment and at least Python 3.6 to run.

• Design overview
  • Motivation
  • Code overview
  • Subsystem details
  • Workflow of regularly executed tasks
  • Attitude control law
• Tutorial
  • Quickstart
  • Creating spacecraft subsystems
  • Internal clock
  • Scheduling actions
  • Setting up an annie simulation
  • Running an annie simulation
  • Exploring annie’s telemetry
• API docs
  • Model
  • Components
  • Setting up and running a simulation