ionoModel.hpp File Reference

Functions
void	obsIonoData (Trace &trace, Receiver &rec)
void	obsIonoDataFromFilter (Trace &trace, ReceiverMap &receiverMap, KFState &measKFstate)
void	filterIonosphere (Trace &trace, KFState &kfState, ReceiverMap &receiverMap, GTime time)
	Updating the ionosphere model parameters The ionosphere model should be initialized by calling 'config_ionosph_model' Ionosphere measurments from stations should be loaded using 'update_station_measr'.
void	ionosphereSsrUpdate (Trace &trace, KFState &kfState)
bool	queryBiasDCB (Trace &trace, KFState &kfState, SatSys Sat, string Rec, E_ObsCode code, double &bias, double &var)
	Estimate biases from Ionosphere modelling DCBs.
void	ionexFileWrite (Trace &trace, string filename, GTime time, KFState &kfState)
void	writeIonStec (string filename, KFState &kFstate)
bool	configIonModel (Trace &trace)
int	configIonModelSphhar (Trace &trace)
	configures the spherical harmonics model.
int	configIonModelSphcap (Trace &trace)
	Initializes Spherical caps Ionosphere model The following configursation parameters are used.
int	configIonModelBsplin (Trace &trace)
	Initializes grid map model The following configursation parameters are used.
int	configIonModelLocal_ (Trace &trace)
bool	ippCheckSphhar (GTime time, VectorPos &Ion_pp)
	rotates the Ionosphere piercing point time: I time of observations (to update the rotation matrix) IPP: I Ionospheric piercing point to be updated
bool	ippCheckSphcap (GTime time, VectorPos &Ion_pp)
	transforms the Ionosphere Piercing Point and checks if it falls in area of coverage time: I time of observations (not used) IPP: I Ionospheric piercing point to be updated returns 1 if the IPP is within the area of coverage
bool	ippCheckBsplin (GTime time, VectorPos &Ion_pp)
	checks if the Ionosphere Piercing Point falls in area of coverage time: I time of observations (not used) IPP: I Ionospheric piercing point to be updated
bool	ippCheckLocal (GTime time, VectorPos &Ion_pp)
	Checks if the Ionosphere Piercing Point falls in area of coverage.
double	ionModelCoef (Trace &trace, int ind, IonoObs &obs, bool slant=true)
double	ionCoefSphhar (Trace &trace, int ind, IonoObs &obs, bool slant=true)
	Evaluates spherical harmonics basis functions int ind I obs I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point.
double	ionCoefSphcap (Trace &trace, int ind, IonoObs &obs, bool slant=true)
	Evaluates spherical cap harmonics basis functions int ind I Basis function number obs I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point.
double	ionCoefBsplin (Trace &trace, int ind, IonoObs &obs, bool slant=true)
	Evaluates B-splines basis functions int ind I Basis function number meas I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point bool slant I state to delay gain; false: state to VTEC gain.
double	ionCoefLocal (Trace &trace, int ind, IonoObs &obs)
	calcuates the partials of observations with respect to basis functions
double	ionVtecSphhar (Trace &trace, GTime time, VectorPos &ionPP, int layer, double &var, KFState &kfState)
	Estimate Ionosphere VTEC using Spherical Cap Harmonic models gtime_t time I time of solutions (not useful for this one Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC.
double	ionVtecSphcap (Trace &trace, GTime time, VectorPos &ionPP, int layer, double &var, KFState &kfState)
	Estimate Ionosphere VTEC using Spherical Cap Harmonic models gtime_t time I time of solutions (not useful for this one Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC.
double	ionVtecBsplin (Trace &trace, GTime time, VectorPos &ionPP, int layer, double &var, KFState &kfState)
	Estimate Ionosphere VTEC using Ionospheric gridmaps Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC returns: VETC at piercing point.
int	checkSSRRegion (VectorPos &pos)
void	ionOutputSphcal (Trace &trace, KFState &kfState)
void	ionOutputLocal (Trace &trace, KFState &kfState)
double	getSSRIono (Trace &trace, GTime time, Vector3d &rRec, AzEl &azel, double &var, SatSys &Sat)
bool	getIGSSSRIono (Trace &trace, GTime time, SSRAtm &ssrAtm, Vector3d &rRec, AzEl &azel, double &iono, double &var)
bool	getCmpSSRIono (Trace &trace, GTime time, SSRAtm &ssrAtm, Vector3d &rRec, double &iono, double &var, SatSys Sat)
bool	configAtmosRegions (Trace &trace, ReceiverMap &receiverMap)

Function Documentation

checkSSRRegion()

int checkSSRRegion

(

VectorPos &

pos

)

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configAtmosRegions()

bool configAtmosRegions	(	Trace &	trace,
		ReceiverMap &	receiverMap )

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configIonModel()

bool configIonModel

(

Trace &

trace

)

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configIonModelBsplin()

int configIonModelBsplin

(

Trace &

trace

)

Initializes grid map model The following configursation parameters are used.

• acsConfig.ionFilterOpts.lat_center: latitude of map centre
• acsConfig.ionFilterOpts.lon_center: longitude of map centre
• acsConfig.ionFilterOpts.lat_width: latitude width of maps
• acsConfig.ionFilterOpts.lon_width: longitude width of maps
• acsConfig.ionFilterOpts.lat_res: latitude resolution of gridmap
• acsConfig.ionFilterOpts.lon_res: longitude resolution of gridmap

- acsConfig.ionFilterOpts.layer_heights: Ionosphere layer Heights

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configIonModelLocal_()

int configIonModelLocal_

(

Trace &

trace

)

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configIonModelSphcap()

int configIonModelSphcap

(

Trace &

trace

)

Initializes Spherical caps Ionosphere model The following configursation parameters are used.

• acsConfig.ionoOpts.lat_center: latitude of map centre
• acsConfig.ionoOpts.lon_center: longitude of map centre
• acsConfig.ionoOpts.lat_width: latitude width of maps
• acsConfig.ionoOpts.lon_width: longitude width of maps
• acsConfig.ionoOpts.func_order: Legendre function order

- acsConfig.ionoOpts.layer_heights: Ionosphere layer Heights

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configIonModelSphhar()

int configIonModelSphhar

(

Trace &

trace

)

configures the spherical harmonics model.

Specifically it initializes: shar_valid time validity of a rotation matrix (the rotation matrix will chase the sun position) Sph_Basis_list List of ionosphere basis time: I time of observations (to update the rotation matrix) IPP: I Ionospheric piercing point to be

updated Since the spherical harmonic model has global validity, the check always return 1

Author: Ken Harima @ RMIT 29 July 2020

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filterIonosphere()

void filterIonosphere	(	Trace &	trace,
		KFState &	kfState,
		ReceiverMap &	receiverMap,
		GTime	time )

Updating the ionosphere model parameters The ionosphere model should be initialized by calling 'config_ionosph_model' Ionosphere measurments from stations should be loaded using 'update_station_measr'.

todo aaron, ew..

Parameters

trace	Trace to output to
kfState	Filter state
receiverMap	List of pointers to stations to use
time	Time of this epoch

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getCmpSSRIono()

bool getCmpSSRIono	(	Trace &	trace,
		GTime	time,
		SSRAtm &	ssrAtm,
		Vector3d &	rRec,
		double &	iono,
		double &	var,
		SatSys	Sat )

Parameters

trace	Debug trace
time	GPS time
ssrAtm	SSR Atmospheric corrections
rRec	receiver position
iono	ionoapheric delay (in TECu)
var	ionoapheric delay (in TECu^2)
Sat	Satellite

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getIGSSSRIono()

bool getIGSSSRIono	(	Trace &	trace,
		GTime	time,
		SSRAtm &	ssrAtm,
		Vector3d &	rRec,
		AzEl &	azel,
		double &	iono,
		double &	var )

Parameters

trace	Debug trace
time	time of ionosphere correction
ssrAtm	SSR atmospheric correction
rRec	receiver position
azel	receiver position
iono	Ionosphere delay (in TECu)
var	Ionosphere variance

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getSSRIono()

double getSSRIono	(	Trace &	trace,
		GTime	time,
		Vector3d &	rRec,
		AzEl &	azel,
		double &	var,
		SatSys &	Sat )

Parameters

trace	Debug trace
time	time of ionosphere correction
rRec	receiver position
azel	satellite azimut/elevation
var	Ionosphere variance
Sat	Satellite

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ionCoefBsplin()

double ionCoefBsplin	(	Trace &	trace,
		int	ind,
		IonoObs &	obs,
		bool	slant )

Evaluates B-splines basis functions int ind I Basis function number meas I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point bool slant I state to delay gain; false: state to VTEC gain.

BSPLINE_LATINT and BSPLINE_LONINT needs to be set before calling this function

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ionCoefLocal()

double ionCoefLocal	(	Trace &	trace,
		int	ind,
		IonoObs &	obs )

calcuates the partials of observations with respect to basis functions

Parameters

ind	Basis function number
obs	Metadata containing piercing points

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ionCoefSphcap()

double ionCoefSphcap	(	Trace &	trace,
		int	ind,
		IonoObs &	obs,
		bool	slant )

Evaluates spherical cap harmonics basis functions int ind I Basis function number obs I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point.

bool slant I false: output coefficient for Vtec, true: output coefficient for delay

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ionCoefSphhar()

double ionCoefSphhar	(	Trace &	trace,
		int	ind,
		IonoObs &	obs,
		bool	slant )

Evaluates spherical harmonics basis functions int ind I obs I Ionosphere measurement struct latIPP - Latitude of Ionosphere Piercing Point lonIPP - Longitude of Ionosphere Piercing Point angIPP - Angular gain for Ionosphere Piercing Point.

int slant I 0: coefficient for VTEC, 1: coefficient for STEC

Parameters

ind	Basis function number
obs	Ionospheric observation metadata
slant	apply slant factor, false: coefficient for VTEC, true: coefficient for STEC

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ionexFileWrite()

void ionexFileWrite	(	Trace &	trace,
		string	filename,
		GTime	time,
		KFState &	kfState )

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ionModelCoef()

double ionModelCoef	(	Trace &	trace,
		int	ind,
		IonoObs &	obs,
		bool	slant = true )

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ionosphereSsrUpdate()

void ionosphereSsrUpdate	(	Trace &	trace,
		KFState &	kfState )

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ionOutputLocal()

void ionOutputLocal	(	Trace &	trace,
		KFState &	kfState )

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ionOutputSphcal()

void ionOutputSphcal	(	Trace &	trace,
		KFState &	kfState )

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ionVtecBsplin()

double ionVtecBsplin	(	Trace &	trace,
		GTime	time,
		VectorPos &	ionPP,
		int	layer,
		double &	var,
		KFState &	kfState )

Estimate Ionosphere VTEC using Ionospheric gridmaps Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC returns: VETC at piercing point.

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ionVtecSphcap()

double ionVtecSphcap	(	Trace &	trace,
		GTime	time,
		VectorPos &	ionPP,
		int	layer,
		double &	var,
		KFState &	kfState )

Estimate Ionosphere VTEC using Spherical Cap Harmonic models gtime_t time I time of solutions (not useful for this one Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC.

returns: VETC at piercing point

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ionVtecSphhar()

double ionVtecSphhar	(	Trace &	trace,
		GTime	time,
		VectorPos &	ionPP,
		int	layer,
		double &	var,
		KFState &	kfState )

Estimate Ionosphere VTEC using Spherical Cap Harmonic models gtime_t time I time of solutions (not useful for this one Ion_pp I Ionosphere Piercing Point layer I Layer number vari O variance of VTEC.

returns: VETC at piercing point

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ippCheckBsplin()

bool ippCheckBsplin	(	GTime	time,
		VectorPos &	Ion_pp )

checks if the Ionosphere Piercing Point falls in area of coverage time: I time of observations (not used) IPP: I Ionospheric piercing point to be updated

returns 1 if the IPP is within the area of coverage

Author: Ken Harima @ RMIT 04 August 2020

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ippCheckLocal()

bool ippCheckLocal	(	GTime	time,
		VectorPos &	ionPP )

Checks if the Ionosphere Piercing Point falls in area of coverage.

Return true if there is a region containing the IPP, false if out of coverage

Parameters

time	time of observations (not used)
ionPP	Ionospheric piercing point to be updated

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ippCheckSphcap()

bool ippCheckSphcap	(	GTime	time,
		VectorPos &	Ion_pp )

transforms the Ionosphere Piercing Point and checks if it falls in area of coverage time: I time of observations (not used) IPP: I Ionospheric piercing point to be updated returns 1 if the IPP is within the area of coverage

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ippCheckSphhar()

bool ippCheckSphhar	(	GTime	time,
		VectorPos &	ionPP )

rotates the Ionosphere piercing point time: I time of observations (to update the rotation matrix) IPP: I Ionospheric piercing point to be updated

Since the spherical harmonic model has global validity, the check always return 1

Author: Ken Harima @ RMIT 29 July 2020

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obsIonoData()

void obsIonoData	(	Trace &	trace,
		Receiver &	rec )

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obsIonoDataFromFilter()

void obsIonoDataFromFilter	(	Trace &	trace,
		ReceiverMap &	receiverMap,
		KFState &	measKFstate )

Parameters

trace	debug trace
receiverMap	List of stations containing observations for this epoch
measKFstate	Kalman filter object containing the ionosphere estimates

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queryBiasDCB()

bool queryBiasDCB	(	Trace &	trace,
		KFState &	kfState,
		SatSys	Sat,
		string	Rec,
		E_ObsCode	code,
		double &	bias,
		double &	var )

Estimate biases from Ionosphere modelling DCBs.

Parameters

trace	debug trace
kfState	Kalman filter to take biases from
Sat	GNSS Satellite
Rec	Receiver id
code	GNSS signal code
bias	Output bias value
var	Output bias variance

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writeIonStec()

void writeIonStec	(	string	filename,
		KFState &	kFstate )

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