SpacecraftEstimation Module

Directory List

AttitudeEstimation	DemoFuns	Demos/AttitudeEstimation
Demos/OpticalNavigation	Demos/OrbitEstimation	Demos/StellarAttDet
Demos/UKF	EstimationData	OpticalNavigation
OrbitEstimation	RelativeState	SensorMeas
StellarAttDet	StellarCatalog	StellarData
StellarEphem	StellarModels

AttitudeEstimation

EKFSSG	A standard discrete Kalman Filter.
KFSunAndEarth2	A Kalman Filter using the sun vector and the earth vector for GEO.
Measurements	Outputs the set of acceptable attitude measurements from vectors.
RMABEst	Estimates gyro bias using a steady state Kalman Filter.
RYGCAttDet	An attitude determination system using roll/yaw gyrocompassing.
RollYawEstimator	Estimates roll and yaw given a roll measurement and body rates.
SunEarthAttDet	An attitude determination system using a sun and earth vector.
SunEarthMagAttDet	Attitude determination using a sun, earth and magnetic field vectors.
SunMagAttDet	An attitude determination system using vector measurements.
YawRollGyroCompassing	Implements yaw/roll gyrocompassing attitude estimation.

DemoFuns

GPressure	Pressure given fuel mass for a blowdown propulsion system.
GUKFOrbit	A linear measurement. Returns y = x.
LatLonToNEU	Transformation matrix from EF to NEU.
RHSEarthOrbitUKF	Point mass gravity model.
RHSIsothermalPState	Model a spacecraft as an isothermal radiator with an input state.
RHSIsothermalUKF	Right-hand-side for an isothermal spacecraft model.
RHSOrbitUKF	Right-hand-side for a cartesian orbit.
RHSPressure	Right-hand-side for a thruster based on the input pulsewidth.
TelescopeUKF	Telescope model for satelite tracking.

Demos/AttitudeEstimation

CovarianceAnalysis	Performs a covariance analysis of different gyros.
KFSunAndEarthTest2	Test a Kalman Filter using a sun vector and the earth vector.
MagSimWithEstimator	Simulate attitude determination for a momentum bias spacecraft.
SunEarthADSim	Test a sun and earth sensor attitude determination system.
SunMagADSim	Test attitude determination with sun, earth and magnetometer.
YRGCDemo	Demonstrate the yaw/roll gyrocompassing system.

Demos/OpticalNavigation

EarthOrbitOpticalNav	Demonstrate optical navigation in earth geosynchronous transfer orbit.
UKFDemoOrbitOpticalNav	Demonstrate orbit estimation using a UKF and optical navigation.
UKFDemoOrbitOpticalNavDeepSpace	Demonstrate orbit estimation using a UKF and planet centroid data.
UKFDemoOrbitOpticalNavLunar	Demonstrate orbit estimation using a UKF and lunar landmark data.

Demos/OrbitEstimation

BatchLSQDemo	Demonstrate batch orbit determination
FImageDemo	Demonstrates the image matching algorithm, FImage.
ImageMatchingDemo	Demonstrates the image matching algorithm.
OrbitDisturbanceEstimator	Demonstrates orbit disturbance estimation using linearized equations.
OrbitKalmanFilter	Test the orbit Kalman Filter with omni and GPS measurements.
SeqBatchLSQDemo	Demonstrate Sequential Batch Least-Squares Orbit Determination
StellarNavigationDemo	Test stellar navigation. Uses a random star catalog.
UKFComparison	Compares UKF.
UKFDemoOrbit	Demonstrate orbit estimation using a UKF with full state measurements.
UKFOrbitEstimation	Demonstrate orbit estimation using UKFPredict and UKFUpdate.
UnscentedKalmanSmootherDemo	UKF/UKS demonstration.

Demos/StellarAttDet

AttDetEKFNoGyroSim	Test a star sensor attitude determination system.
AttDetEKFSim	Test a star sensor attitude determination system with gyros.
AttDetUKFSim	Simulate a star sensor attitude determination system with gyros.
KalmanFilterDemo	Demonstrate a Kalman Filter for a gyro based attitude determination system.
PinholeCameraDemo	Demonstrate the Pinhole camera function
QFromUDemo	Demonstrate QFromU which performs static attitude determination.
StarIDPyramidDemo	Test pyramid star identification with a random catalog

Demos/UKF

IsothermalUKF	A UKF that estimates thermal parameters for an isothermal model.
IsothermalUKFState	Estimate temperature and external flux using a UKF.
PressureKF	Demonstrate a fuel mass Kalman filter for a blowdown system.
UKFOrbitAnglesDemo	UKF orbit angles

EstimationData

1824_ers2_crd_20100719_20_00.frd - 2

OpticalNavigation

NavTargetTrackingLunar	Selects landmark targets for an optical navigation system.
NavTargetTrackingPlanetary	Selects planetary navigation targets for an optical navigation system.
OpticalNavAccuracy	Computes optical navigation accuracy.
OpticalNavLunarLandmarkStar	Computes optical using lunar landmarks and stars.
OpticalNavPlanetStar	Computes optical measurements for planets and stars.
OpticalNavPlanetStarNoiseMatrix	Computes the noise matrix for navigation with stars and planets.
OpticalNavigationMeasurement	Computes three types of optical measurements.
PolarStars	Find polar stars

OrbitEstimation

BatchLSQOD	Perform batch least-squares method for orbit determination.
CDKF45	Continuous discrete iterated Kalman Filter.
FImage	Cost function for image matching.
FOrbKF	Computes the right-hand-side of the orbit equations for OrbitKalmanFilter.
FOrbitKFPointMass	Computes the right-hand-side of the for a point mass gravity model.
GroundStation	Generate the ECI coordinates of an Earth-fixed position at a given time
HRangeMeasurement	Generate the range/range rate measurement matrix and the estimated measurement.
HRangeRangeRate	Measurement matrix for range and range rate
LoadILRSDataFromFRD	Loads information from a CRD formatted file such as those used by the
MeasEarthTarget	Range and range rate to an Earth target.
MeasOrbitState	Full state measurement of an orbit.
OrbitKFRHS	Computes the right-hand-side of the orbit equations about a mass point.
OrbitODGenObs	Generates a set of observations given an initial orbit state
ReshapeCovariance	Reshape a covariance matrix from square to a column and back.
SeqBatchLSQOD	Perform sequential batch least-squares method for orbit determination.
StellarNavigation	Demonstrate stellar navigation.

RelativeState

RelativeStateFromPoints

Finds the transformation matrix and relative position given at least

SensorMeas

MeasCamera	Camera model which returns the centroid locations in the imaging plane.
MeasEarthChord	Earth chord model for use with UKF.
MeasGPS	GPS range and range rate model for use with UKF.
MeasNadirStar	Nadir/star measurement for use with UKF.
MeasRadar	3D radar model for use with Kalman Filters.
MeasRangeGroundStation	Range and range rate to ground station.
MeasurementsSunMagUKF	Outputs the set of acceptable attitude measurements from vectors.

StellarAttDet

AdjustMeasSetForKnownMeas	Remove known measurements and solved for measurement pairs.
AttProp	Propagates a quaternion one step
ComputePixelMapScale	Computes the pixel map conversion factor.
ConvertPairs	Convert pairs from the old format:
CreateKVector	CREATEKVECTOR Create the k vector from an array of data
DSTM	Computes the discrete state transition matrix for a plant.
DSTMQ	Computes the state transition matrix for the delta quaternion only.
GStarUKFLin	Linearized star measurement function for in the UKF.
GStarUKFNL	Nonlinear star measurement function for use in the UKF.
IntGyroQuaternion	Propagates the quaternion assuming constant rate.
Occurences	Finds the number of unique numbers in x and how many times they appear.
PinholeCameraStruct	Default data structure for a pinhole camera.
PinholeStarCamera	Models a pinhole camera for star identification.
PixelMapCentroid	Finds the centroids of bright objects in the pixelMap.
QFromU	Computes an attitude quaternion given a set of measured and cataloged
RHSGyro	RHSGyro models a rate gyro or rate integrating gyro (RIG)
RHSQ	Quaternion derivative.
RateFromDQ	Computes angular rate from the equation mDot = m*Skew(w)
SReduce	Reduction of stellar coordinates to apparent coordinates.
STM	Quaternion state transition matrix
SearchKVector	SEARCHKVECTOR Implement the range searching of data using a k vector.
SelectMeasurementSet	Select a subset of measurements.
Snapshots	Make star ID snapshots and plot in a single figure.
StarCentroidCOM	Finds the centroid given intensities on n pixels and their coordinates.
StarDensity	Generates a star density plot.
StarIDPyramid	STARIDPYRAMID Identifies the best star matchesusing triads.
StarMeas	Generate star measurement matrix
StarMeasLin	Linear star measurement function.
StarMeasNL	Nonlinear star measurement function.
StarMeasurement	Computes the measurement matrix, measurements and noise
StarMeasurementUKF	Computes the measurements for the UKF
StarMovie	Make a star ID movie. Pass a cell array of starDataMeas arrays.
StellarAttDetEKF	A stellar attitude determination system.
StellarAttDetEKFNoGyros	A stellar attitude determination system that does not use gyros.
StellarAttDetUKF	Stellar attitude determination using the Unscented Kalman Filter

StellarCatalog

DisplayCatalog	Display a catalog.
DisplayStars	Models a pinhole camera. Projects the catalog into the camera frame.
GetStarPatch	Generates a star catalog for a patch of sky.
Int2VM	Converts intensity in watts/m^2 to apparent visual magnitude.
LoadCatalog	Load a catalog and reduce it based on visual magnitude.
NASANavCatalog	Generates a text file with stars above the cutoff magnitude.
RandSC	Generates a random star catalog in star matrix format.
StarDataFromStarMatrix	Generates a star data structure from a star matrix.
StarDataGeneration	Generates a star data structure
StarIDTestCatalog	Generates a star catalog for testing the starid functions.
SubCatalog	Create a sub catalog
Swath	Generates a swath catalog in star matrix format.
TelescopeAperture	Computes the number of stars that are visible for a given aperture.
VM2Electrons	Converts apparent visual magnitude to electrons per second per mm^2.

StellarData

FK5Polar.mat - FK5 polar stars.

FK5Short.cat - FK5 short catalog.

FK5X.cat - FK5 based catalog.

Hipparcos.mat - Hipparcos star catalog.

StarFieldDemo.jpg - Demonstrate star field data.

StarPatch.mat - A star patch of polar stars from FK5.

dPTolData.dat - Dot product tolerance data.

test.dat - Test data.

StellarEphem

EarthBc	Compute the barycentric position and velocity of the earth.
LightDef	Compute gravitational light deflection.
Pix2U	Converts a pixel location into a unit vector.
RADecToPix	Convert right ascension and declination to pixels.
SqrFOV	Determines if a unit vector falls within a square FOV
StellAbr	Adjust the vector u for aberration.
SunBc	Compute the barycentric position of the sun.

StellarModels

CCDNoise	Computes the CCD noise structure.
CCDRes	Computes the angular resolution of the CCD.
DeFocus	Spread of a point light source due to defocusing
FRBwRIG	Simulates a spacecraft with rate integrating gyros.
StarSensor	Computes the output of a star sensor.
VM2PSFPeak	Finds the peak of the point spread function from visual magnitude.

SVN Revision: 42425

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