thrustRWDesat

Executive Summary

This algorithm is used to control both the RCS and DV thrusters when executing a trajectory adjustment.

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.

Module I/O Messages

Msg Variable Name	Msg Type	Description
rwSpeedInMsg	RWSpeedMsgPayload	RW speed input message
rwConfigInMsg	RWConstellationMsgPayload	RW configuration input message
thrConfigInMsg	THRArrayConfigMsgPayload	Thruster configuration input message
vecConfigInMsg	VehicleConfigMsgPayload	spacecraft configuration input message
thrCmdOutMsg	THRArrayOnTimeCmdMsgPayload	thruster array commanded on time output message

Class ThrustRWDesat

class ThrustRWDesat : public SysModel

module configuration message

Public Functions

void updateState(uint64_t callTime) override

This method takes in the current oberved reaction wheel angular velocities.

Parameters:

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

Returns:

void

Public Members

ReadFunctor<RWSpeedMsgPayload> rwSpeedInMsg

(-) The name of the input RW speeds message

ReadFunctor<RWConstellationMsgPayload> rwConfigInMsg

[-] The name of the RWA configuration message

ReadFunctor<THRArrayConfigMsgPayload> thrConfigInMsg

[-] The name of the thruster configuration message

ReadFunctor<VehicleConfigMsgPayload> vecConfigInMsg

[-] The name of the input spacecraft mass properties message

Message<THRArrayOnTimeCmdMsgPayload> thrCmdOutMsg

(-) The name of the output thrust command block

double rwAlignMap[3 * MAX_EFF_CNT]

(-) Alignment of the reaction wheel spin axes

double thrAlignMap[3 * MAX_EFF_CNT]

(-) Alignment of the vehicle thrusters

double thrTorqueMap[3 * MAX_EFF_CNT]

(-) Alignment of the vehicle thruster torques

double maxFiring

(s) Maximum time to fire a jet for

double thrFiringPeriod

(s) The amount of time to rest between thruster firings

int numRWAs

(-) Number of reaction wheels being desaturated

int numThrusters

(-) Number of thrusters available in the align map

double accumulatedImp[3]

(s) The accumulated firing in the body frame

double currDMDir[3]

(-) The current direction of momentum reduction

double totalAccumFiring

(s) The total thruster duration we’ve commanded

double DMThresh

(r/s) The point at which to stop decrementing momentum

uint64_t previousFiring

(ns) Time that the last firing command was given

BSKLogger bskLogger = {}

BSK Logging.