magneticFieldBase¶

General magnetic field base class used to calculate the magnetic field above a planet using multiple models. The MagneticField class is used to calculate the magnetic field vector above a body using multiple models. This base class is used to hold relevant planetary magnetic field properties to compute answers for a given set of spacecraft locations relative to a specified planet. Specific magnetic field models are implemented as classes that inherit from this base class. Planetary parameters, including position and input message, are settable by the user. In a given simulation, each planet of interest should have only one magnetic field model associated with it linked to the spacecraft in orbit about that body.

class MagneticFieldBase : public SysModel ¶

Public Functions

MagneticFieldBase()¶

This method initializes some basic parameters for the module.

Return: void

~MagneticFieldBase()¶

Destructor.

Return: void

void SelfInit()¶

SelfInit for this method creates a seperate magnetic field message for each of the spacecraft that were added using AddSpacecraftToModel. Additional model outputs are also initialized per-spacecraft.

Return: void

void CrossInit()¶

This method is used to connect the input position message from the spacecraft. Additonal model-specific cross inits are also conducted.

Return: void

void Reset(uint64_t CurrentSimNanos)¶

This method is used to reset the module.

Return: void

void addSpacecraftToModel(std::string tmpScMsgName)¶

Adds the spacecraft message name to a vector of sc message names and automatically creates an output message name.

Return

void

Parameters

tmpScMsgName: A spacecraft state message name.

void UpdateState(uint64_t CurrentSimNanos)¶

Computes the current local magnetic field for each spacecraft and writes their respective messages.

Return

void

Parameters

CurrentSimNanos: The current simulation time in nanoseconds

Public Members

std::vector<std::string> scStateInMsgNames¶: Vector of the spacecraft position/velocity message names.

std::vector<std::string> envOutMsgNames¶: Vector of message names to be written out by the environment.

std::string planetPosInMsgName¶: Message name for the planet’s SPICE position message.

double envMinReach¶: [m] Minimum planet-relative position needed for the environment to work, default is off (neg. value)

double envMaxReach¶: [m] Maximum distance at which the environment will be calculated, default is off (neg. value)

double planetRadius¶: [m] Radius of the planet

Protected Functions

void writeMessages(uint64_t CurrentClock)¶

This method is used to write the output magnetic field messages whose names are established in AddSpacecraftToModel.

Return

void

Parameters

CurrentClock: The current time used for time-stamping the message

bool readMessages()¶

This method is used to read the incoming command message and set the associated spacecraft positions for computing the atmosphere.

Return: void

void updateLocalMagField(double currentTime)¶

This method is used to update the local magnetic field based on each spacecraft’s position.

Return: void

void updateRelativePos(SpicePlanetStateSimMsg *planetState, SCPlusStatesSimMsg *scState)¶

This method is used to determine the spacecraft position vector relative to the planet.

Return

void

Parameters

planetState: A space planetstate message struct.
scState: A spacecraftPlusStates message struct.

void evaluateMagneticFieldModel(MagneticFieldSimMsg *msg, double currentTime) = 0¶

void customSelfInit()¶

Custom SelfInit() method. This allows a child class to add additional functionality to the SelfInit() method

Return: void

void customCrossInit()¶

Custom CrossInit() method. This allows a child class to add additional functionality to the CrossInit() method

Return: void

void customReset(uint64_t CurrentClock)¶

Custom Reset() method. This allows a child class to add additional functionality to the Reset() method

Return: void

void customWriteMessages(uint64_t CurrentClock)¶

Custom output message writing method. This allows a child class to add additional functionality.

Return: void

bool customReadMessages()¶

Custom output input reading method. This allows a child class to add additional functionality.

Return: void

void customSetEpochFromVariable()¶

Custom customSetEpochFromVariable() method. This allows a child class to specify how the module epoch information is set by a module variable.

Return: void

Protected Attributes

Eigen::Vector3d r_BP_N¶: [m] sc position vector relative to planet in inertial N frame components

Eigen::Vector3d r_BP_P¶: [m] sc position vector relative to planet in planet-fixed frame components

double orbitRadius¶: [m] sc orbit radius about planet

uint64_t OutputBufferCount¶: number of output buffers for messaging system

std::vector<MagneticFieldSimMsg> magFieldOutBuffer¶: Message buffer for magnetic field messages

std::vector<int64_t> envOutMsgIds¶: vector of module output message IDs

std::vector<int64_t> scStateInMsgIds¶: vector of spacecraft state message IDs

int64_t planetPosInMsgId¶: ID of the planet state message.

std::vector<SCPlusStatesSimMsg> scStates¶: vector of the spacecraft state messages

SpicePlanetStateSimMsg planetState¶: planet state message

struct tm epochDateTime¶: time/date structure containing the epoch information using a Gregorian calendar

int64_t epochInMsgId¶: ID of the epoch message.