Source code for scenario_OpNavODLimb

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r"""
Overview
--------

This scenario only performs the orbit determination component of the FSW stack.
It uses the Limb based method for image processing.
More details can be found in Chapter 4 of `Thibaud Teil's PhD thesis <http://hanspeterschaub.info/Papers/grads/ThibaudTeil.pdf>`_.

The script can be run at full length by calling::

    python3 scenario_OpNavODLimb.py

"""

# Get current file path
import inspect
import os
import sys
import time

from Basilisk.utilities import RigidBodyKinematics as rbk
# Import utilities
from Basilisk.utilities import orbitalMotion, macros, unitTestSupport

filename = inspect.getframeinfo(inspect.currentframe()).filename
path = os.path.dirname(os.path.abspath(filename))

# Import master classes: simulation base class and scenario base class
sys.path.append(path + '/..')
from BSK_OpNav import BSKSim, BSKScenario
import BSK_OpNavDynamics, BSK_OpNavFsw
import numpy as np

# Import plotting file for your scenario
sys.path.append(path + '/../plottingOpNav')
import OpNav_Plotting as BSK_plt

# Create your own scenario child class
[docs] class scenario_OpNav(BSKScenario): """Main Simulation Class""" def __init__(self, masterSim, showPlots=False): super(scenario_OpNav, self).__init__(masterSim, showPlots) self.name = 'scenario_opnav' self.masterSim = masterSim # declare additional class variables self.opNavRec = None self.limbRec = None self.scRec = None self.filtRec = None
[docs] def configure_initial_conditions(self): # Configure Dynamics initial conditions oe = orbitalMotion.ClassicElements() oe.a = 18000 * 1E3 # meters oe.e = 0.2 oe.i = 10 * macros.D2R oe.Omega = 25. * macros.D2R oe.omega = 190. * macros.D2R oe.f = 0. * macros.D2R # 90 good mu = self.masterSim.get_DynModel().gravFactory.gravBodies['mars barycenter'].mu rN, vN = orbitalMotion.elem2rv(mu, oe) orbitalMotion.rv2elem(mu, rN, vN) bias = [0, 0, -2] MRP= [0,-0.3,0] self.masterSim.get_FswModel().relativeOD.stateInit = rN.tolist() + vN.tolist() self.masterSim.get_DynModel().scObject.hub.r_CN_NInit = rN self.masterSim.get_DynModel().scObject.hub.v_CN_NInit = vN self.masterSim.get_DynModel().scObject.hub.sigma_BNInit = [[MRP[0]], [MRP[1]], [MRP[2]]] # sigma_BN_B self.masterSim.get_DynModel().scObject.hub.omega_BN_BInit = [[0.0], [0.0], [0.0]] # rad/s - omega_BN_B qNoiseIn = np.identity(6) qNoiseIn[0:3, 0:3] = qNoiseIn[0:3, 0:3] * 1E-3 * 1E-3 qNoiseIn[3:6, 3:6] = qNoiseIn[3:6, 3:6] * 1E-4 * 1E-4 self.masterSim.get_FswModel().relativeOD.qNoise = qNoiseIn.reshape(36).tolist() self.masterSim.get_FswModel().horizonNav.noiseSF = 20
[docs] def log_outputs(self): # Dynamics process outputs: log messages below if desired. FswModel = self.masterSim.get_FswModel() DynModel = self.masterSim.get_DynModel() # FSW process outputs samplingTimeFsw = self.masterSim.get_FswModel().processTasksTimeStep samplingTimeDyn = self.masterSim.get_DynModel().processTasksTimeStep self.filtRec = FswModel.relativeOD.filtDataOutMsg.recorder(samplingTimeFsw) self.opNavRec = FswModel.opnavMsg.recorder(samplingTimeFsw) self.limbRec = FswModel.limbFinding.opnavLimbOutMsg.recorder(samplingTimeFsw) self.scRec = DynModel.scObject.scStateOutMsg.recorder(samplingTimeDyn) self.masterSim.AddModelToTask(DynModel.taskName, self.filtRec) self.masterSim.AddModelToTask(DynModel.taskName, self.opNavRec) self.masterSim.AddModelToTask(DynModel.taskName, self.limbRec) self.masterSim.AddModelToTask(DynModel.taskName, self.scRec) return
[docs] def pull_outputs(self, showPlots): # Dynamics process outputs: pull log messages below if any ## Spacecraft true states position_N = unitTestSupport.addTimeColumn(self.scRec.times(), self.scRec.r_BN_N) velocity_N = unitTestSupport.addTimeColumn(self.scRec.times(), self.scRec.v_BN_N) ## Attitude sigma_BN = unitTestSupport.addTimeColumn(self.scRec.times(), self.scRec.sigma_BN) ## Image processing limb = unitTestSupport.addTimeColumn(self.limbRec.times(), self.limbRec.limbPoints) numLimbPoints = unitTestSupport.addTimeColumn(self.limbRec.times(), self.limbRec.numLimbPoints) validLimb = unitTestSupport.addTimeColumn(self.limbRec.times(), self.limbRec.valid) ## OpNav Out measPos = unitTestSupport.addTimeColumn(self.opNavRec.times(), self.opNavRec.r_BN_N) r_C = unitTestSupport.addTimeColumn(self.opNavRec.times(), self.opNavRec.r_BN_C) measCovar = unitTestSupport.addTimeColumn(self.opNavRec.times(), self.opNavRec.covar_N) covar_C = unitTestSupport.addTimeColumn(self.opNavRec.times(), self.opNavRec.covar_C) NUM_STATES = 6 ## Navigation results navState = unitTestSupport.addTimeColumn(self.filtRec.times(), self.filtRec.state) navCovar = unitTestSupport.addTimeColumn(self.filtRec.times(), self.filtRec.covar) navPostFits = unitTestSupport.addTimeColumn(self.filtRec.times(), self.filtRec.postFitRes) sigma_CB = self.masterSim.get_DynModel().cameraMRP_CB sizeMM = self.masterSim.get_DynModel().cameraSize sizeOfCam = self.masterSim.get_DynModel().cameraRez focal = self.masterSim.get_DynModel().cameraFocal #in m pixelSize = [] pixelSize.append(sizeMM[0] / sizeOfCam[0]) pixelSize.append(sizeMM[1] / sizeOfCam[1]) dcm_CB = rbk.MRP2C(sigma_CB) # Plot results BSK_plt.clear_all_plots() stateError = np.zeros([len(position_N[:,0]), NUM_STATES+1]) navCovarLong = np.full([len(position_N[:,0]), 1+NUM_STATES*NUM_STATES], np.nan) navCovarLong[:,0] = np.copy(position_N[:,0]) stateError[:, 0:4] = np.copy(position_N) stateError[:,4:7] = np.copy(velocity_N[:,1:]) measError = np.full([len(measPos[:,0]), 4], np.nan) measError[:,0] = measPos[:,0] measError_C = np.full([len(measPos[:,0]), 5], np.nan) measError_C[:,0] = measPos[:,0] trueRhat_C = np.full([len(numLimbPoints[:,0]), 4], np.nan) trueR_C = np.full([len(numLimbPoints[:,0]), 4], np.nan) trueCircles = np.full([len(numLimbPoints[:,0]), 4], np.nan) trueCircles[:,0] = numLimbPoints[:,0] trueRhat_C[:,0] = numLimbPoints[:,0] trueR_C[:,0] = numLimbPoints[:,0] switchIdx = 0 Rmars = 3396.19*1E3 for j in range(len(stateError[:, 0])): if stateError[j, 0] in navState[:, 0]: stateError[j, 1:4] -= navState[j - switchIdx, 1:4] stateError[j, 4:] -= navState[j - switchIdx, 4:] else: stateError[j, 1:] = np.full(NUM_STATES, np.nan) switchIdx += 1 for i in range(len(numLimbPoints[:,0])): if numLimbPoints[i,1] > 1E-8: measError[i, 1:4] = position_N[i +switchIdx, 1:4] - measPos[i, 1:4] measError_C[i, 4] = np.linalg.norm(position_N[i +switchIdx, 1:4]) - np.linalg.norm(r_C[i, 1:4]) measError_C[i, 1:4] = trueRhat_C[i,1:] - r_C[i, 1:4]/np.linalg.norm(r_C[i, 1:4]) trueR_C[i,1:] = np.dot(np.dot(dcm_CB, rbk.MRP2C(sigma_BN[i +switchIdx, 1:4])) , position_N[i +switchIdx, 1:4]) trueRhat_C[i,1:] = np.dot(np.dot(dcm_CB, rbk.MRP2C(sigma_BN[i +switchIdx, 1:4])) ,position_N[i +switchIdx, 1:4])/np.linalg.norm(position_N[i +switchIdx, 1:4]) trueCircles[i,3] = focal*np.tan(np.arcsin(Rmars/np.linalg.norm(position_N[i,1:4])))/pixelSize[0] trueRhat_C[i,1:] *= focal/trueRhat_C[i,3] trueCircles[i, 1] = trueRhat_C[i, 1] / pixelSize[0] + sizeOfCam[0]/2 - 0.5 trueCircles[i, 2] = trueRhat_C[i, 2] / pixelSize[1] + sizeOfCam[1]/2 - 0.5 else: measCovar[i,1:] = np.full(3*3, np.nan) covar_C[i, 1:] = np.full(3 * 3, np.nan) navCovarLong[switchIdx:,:] = np.copy(navCovar) timeData = position_N[:, 0] * macros.NANO2MIN BSK_plt.plot_TwoOrbits(position_N, measPos) BSK_plt.diff_vectors(trueR_C, r_C, validLimb, "Limb") BSK_plt.plot_limb(limb, numLimbPoints, validLimb, sizeOfCam) # BSK_plt.AnimatedScatter(sizeOfCam, circleCenters, circleRadii, validCircle) # BSK_plt.plot_cirlces(timeData[switchIdx:], circleCenters, circleRadii, validCircle, sizeOfCam) BSK_plt.plotStateCovarPlot(stateError, navCovarLong) # BSK_plt.imgProcVsExp(trueCircles, circleCenters, circleRadii, np.array(sizeOfCam)) BSK_plt.plotPostFitResiduals(navPostFits, measCovar) figureList = {} if showPlots: BSK_plt.show_all_plots() else: fileName = os.path.basename(os.path.splitext(__file__)[0]) figureNames = ["attitudeErrorNorm", "rwMotorTorque", "rateError", "rwSpeed"] figureList = BSK_plt.save_all_plots(fileName, figureNames) return figureList
def run(showPlots, simTime = None): # Instantiate base simulation TheBSKSim = BSKSim(fswRate=0.5, dynRate=0.5) TheBSKSim.set_DynModel(BSK_OpNavDynamics) TheBSKSim.set_FswModel(BSK_OpNavFsw) # Configure a scenario in the base simulation TheScenario = scenario_OpNav(TheBSKSim, showPlots) TheScenario.log_outputs() TheScenario.configure_initial_conditions() TheBSKSim.get_DynModel().cameraMod.saveImages = 0 # liveStream is used for viewing the spacecraft as it navigates, noDisplay is for headless camera simulation TheBSKSim.get_DynModel().vizInterface.noDisplay = True # The following code spawns the Vizard application from python # Modes: "None", "-directComm", "-noDisplay" TheScenario.run_vizard("-noDisplay") # Configure FSW mode TheScenario.masterSim.modeRequest = 'prepOpNav' # Initialize simulation TheBSKSim.InitializeSimulation() # Configure run time and execute simulation simulationTime = macros.min2nano(3.) TheBSKSim.ConfigureStopTime(simulationTime) print('Starting Execution') t1 = time.time() TheBSKSim.ExecuteSimulation() TheScenario.masterSim.modeRequest = 'OpNavODLimb' if simTime != None: simulationTime = macros.min2nano(simTime) else: simulationTime = macros.min2nano(600) TheBSKSim.ConfigureStopTime(simulationTime) TheBSKSim.ExecuteSimulation() t2 = time.time() print('Finished Execution in ', t2-t1, ' seconds. Post-processing results') # Terminate vizard and show plots figureList = TheScenario.end_scenario() return figureList if __name__ == "__main__": run(True)