Module: simpleMassProps

Executive Summary

This module simulates a spacecraft mass sensor. It receives the mass properties from a spacecraft object using a simulation type message, and converts it into a FSW type message to be used in flight software modules.

Message Connection Descriptions

The following table lists all the module input and output messages. The module msg connection is set by the user from python.

Module I/O Messages

Msg Variable Name	Msg Type	Description
scMassPropsInMsg	SCMassPropsMsgPayload	Spacecraft mass properties input message. It contains the mass, inertia and center of mass of the spacecraft in a simulation type message.
vehicleConfigOutMsg	VehicleConfigMsgPayload	Vehicle configuration output message. It contains the mass, inertia and center of mass of the spacecraft in a FSW type message.

Detailed Module Description

The module copies the contents from a SCMassPropsMsgPayload to a VehicleConfigMsgPayload message.

Model Assumptions and Limitations

This code makes the following assumptions:

• Sensor is perfect: The sensor measures the exact spacecraft mass properties without noise or any other interference.

User Guide

This section contains conceptual overviews of the code and clear examples for the prospective user.

Module Setup

The module is created in python using:

scMassPropsModule = simpleMassProps.SimpleMassProps()
scMassPropsModule.ModelTag = "scMassPropsModule"

---

class SimpleMassProps : public SysModel

#include <simpleMassProps.h>

FSW mass properties converter module class.

Public Functions

SimpleMassProps()

This is the constructor for the module class.

~SimpleMassProps()

Module Destructor.

void Reset(uint64_t CurrentSimNanos)

This method is used to reset the module.

Returns:

void

void readInputMessages()

This method reads the spacecraft mass properties state input message

void writeOutputMessages(uint64_t CurrentClock)

This method writes the vehicle configuration output message.

Parameters:

CurrentClock – The clock time associated with the model call

Returns:

void

void computeMassProperties()

This method transfers the spacecraft mass propertiies information to a FSW format

void UpdateState(uint64_t CurrentSimNanos)

This is the main method that gets called every time the module is updated. It reads the simulation message, transfers its contents and writes to an output FSW message.

Returns:

void

Public Members

ReadFunctor<SCMassPropsMsgPayload> scMassPropsInMsg

sc mass properties input msg

Message<VehicleConfigMsgPayload> vehicleConfigOutMsg

vehicle configuration output msg

BSKLogger bskLogger

&#8212; BSK Logging

Private Members

SCMassPropsMsgPayload scMassPropsMsgBuffer

VehicleConfigMsgPayload vehicleConfigMsgBuffer

buffer for the mass properties message