SpacecraftEstimation Module

Directory List

AttitudeEstimation

EKFSSG	A standard discrete Kalman Filter.
GyroKalmanFilter	Gyro 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.
UKFUpdateAtt	Unscented Kalman Filter measurement update step.
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/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.
UKFOrbitEstimationDoris	Demonstrate orbit estimation using UKFPredict and UKFUpdate.
UnscentedKalmanSmootherDemo	UKF/UKS demonstration.

Demos/StarSimulation

SampleCentroidImage

Sample Image Generation script

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.
StarIDFromImage	Pyramid Star ID from a camera image
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
Asteroid.jpg	Asteroid image for centroiding.
GibbousMoon.jpg	Gibbous moon image for centroiding.

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
MeasDoris	Range rate to an Earth target.
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
WorldToCamera	Finds the camera focal plane locations of world points.

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.

StarCentroiding

Blobify	Group adjacent pixels together into blobs.
CentroidCOM	Center of mass centroiding algorithm.
CoarseCentroids	Finds the centroids given a pixelmap.
PostProcessCOM	Post process center-of-mass data
ProcessStarImage	Load a star image and process it for centroids.
StarPrediction	Finds stars in the field of view

StarProcessing

ApplyThreshold	APPLYTHRESHOLD Apply a threshold to a pixelmap
FitHist	Calculate a histogram of the pixels and fit a Gaussian to the mode.
FitStarHist	Fit a 2D gaussian to a star image
FitStarMoffat	Fit a 2D Moffat PSF to a star image
LoadStarImage	Load a star image with imread and generate metadata.

StarSimulation

IntegratePSFs

Finds the output of each pixel through numerical integration.

StarVisualization

DrawBlobs	Draw the blobs on top of the pixelmap using imagesc.
DrawPixelmap	Draw a pixelmap using imagesc
DrawStarImageCentroids	Create a figure with two subplots, for the pixels and the centroids.
PixelsHist	Plot the distribution of pixels values assuming integer bits.
PlotCentroids	PLOTCENTROIDS Plot star centroids on the image using pcolor
StarImageHistogram	Generate a figure with two subplots of the histogram

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 to the new format
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 matches using triads.
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

AssessCatalog	Assess the global and local uniformity of a star catalog
DisplayCatalog	Display a star 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.
ProcessCatalog	Load the Hipparcos catalog and create the near matrix
RandSC	Generates a random star catalog in star matrix format.
RearrangeCatalog	Convert the catalog data structure to a structure array.
ReduceCatalog	REDUCECATALOG Reduce the catalog based on the angular resolution.
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

FK5.txt	FK4 data.
FK5Polar.mat	FK5 polar stars.
FK5Short.cat	FK5 short catalog.
FK5X.cat	FK5 based catalog.
Hipparcos.mat	Hipparcos star catalog.
Plejades.tif	Sample star camera image
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.

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