scenarioGroundLocationImaging

Overview

This scenario demonstrates imaging a target on the surface of the Earth based on access and attitude error requirements. Simulated data generated from this image is stored in an on-board storage device and then downlinked to a ground station.

The script is found in the folder xmera/examples and executed by using:

python3 scenarioGroundLocationImaging.py

The simulation uses groundLocation to create an output message with the desired ground target’s inertial position. This is fed to the 2D pointing module locationPointing which directs the 3rd body axis to point towards the target. Once the target is accessible per the groundLocation class’ accessOutMsg and below the prescribed attitude error from the locationPointing class’ attGuidOutMsg, the simpleInstrumentController sends a deviceStatusOutMsg to the simpleInstrument to turn the imager on for a single time step. The simpleInstrument sends this data to a partitionedStorageUnit. The data is then downlinked using a spaceToGroundTransmitter once a ground station represented by another groundLocation class is accessible.

A reset of the groundLocation and simpleInstrumentController for the purposes of switching to a new target after the first one is imaged is also demonstrated.

Illustration of Simulation Results

show_plots = True

The following plots illustrate the 2D pointing error, access data, image commands, and level of the storage unit.