ephemDifference

Executive Summary

This module reads in the position and velocity of multiple orbital bodies and outputs position and velocity of each body relative to a single other orbital body position and velocity. Up to 10 input ephemeris messages can be connected.

More information can be found in the PDF Description.

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. The msg type contains a link to the message structure definition, while the description provides information on what this message is used for.

Figure 1: ephemDifference() Module I/O Illustration

Module I/O Messages

Msg Variable Name	Msg Type	Description
ephBaseInMsg	EphemerisMsgPayload	base ephemeris input message name
ephInMsg	EphemerisMsgPayload	ephemeris input message to be converted, stored in changeBodies[i]
ephOutMsg	EphemerisMsgPayload	converted ephemeris output message, stored in changeBodies[i]

Class EphemDifference

class EphemDifference : public SysModel

Container holding ephemDifference module variables.

Public Functions

void updateState(uint64_t callTime) override

This method recomputes the body positions and velocities relative to the base body ephemeris and writes out updated ephemeris position and velocity for each body.

Parameters:

callTime – The clock time at which the function was called (nanoseconds)

Returns:

void

void reset(uint64_t callTime) override

This method resets the module.

Parameters:

callTime – The clock time at which the function was called (nanoseconds)

Returns:

void

Public Members

ReadFunctor<EphemerisMsgPayload> ephBaseInMsg

base ephemeris input message name

EphemChangeConfig changeBodies[MAX_NUM_CHANGE_BODIES]

[-] The list of bodies to change out

uint32_t ephBdyCount

[-] The number of ephemeris bodies we are changing

BSKLogger bskLogger = {}

BSK Logging.