spec_sun_sensor.md

Specification for SunSensor class

1. Overview

1. functions

• The SunSensor class simulates a sun sensor.
• The SunSensor class calculates and returns the observed sun vector with noise.

2. files

• sun_sensor.cpp, sun_sensor.hpp: Definitions and declarations of the class
• sun_sensor.ini: Initialization file
• plot_sun_sensor.py: An example of a Python script to plot sun sensor output

3. how to use

• Set the parameters in sun_sensor.ini.

  • quaternion_b2c: Frame conversion quaternion from body to component frame.

  • field_of_view_deg: Field of view of the sun sensor

  • white_noise_standard_deviation_deg: White noise standard deviation

  • bias_standard_deviation_deg: Bias noise standard deviation

  • intensity_lower_threshold_percent: Lower threshold of intensity to generate observation result

  • Other parameters

    • Parameters for the Component class
    • Parameters for the PowerPort class
• Create an instance by using the initialization function InitSunSensor
• Use the Get* function to get angular velocity information.

2. Explanation of Algorithm

1. MainRoutine

1. Overview

• The sun direction vector is converted to the component frame.
• Judge the sun is inside the field of view of the sun sensor.
• Add observation noises.

2. Inputs and Outputs

• NA

3. Algorithm

• NA

3. Results of verifications

• The output result obtained by the default initial settings.
  • The figure is generated by the Python script.