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Added option for constant IMU bias

release/4.3a0
djensen3 2014-04-17 22:21:22 -04:00
parent 26c296603f
commit 5abf0b01ea
2 changed files with 25 additions and 8 deletions
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27
matlab/unstable_examples/+imuSimulator/covarianceAnalysisBetween.m
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@ -19,6 +19,7 @@ options.includeBetweenFactors = 1; % if true, BetweenFactors will be added betwe
options.includeIMUFactors = 1; % if true, IMU factors will be added between consecutive states (biases, poses, velocities)
options.imuFactorType = 1; % Set to 1 or 2 to use IMU type 1 or type 2 factors (will default to type 1)
options.imuNonzeroBias = 0; % if true, a nonzero bias is applied to IMU measurements
options.includeCameraFactors = 0; % not fully implemented yet
numberOfLandmarks = 10; % Total number of visual landmarks, used for camera factors
@ -57,7 +58,8 @@ metadata.imu.g = [0;0;0];
metadata.imu.omegaCoriolis = [0;0;0];
noiseVel = noiseModel.Isotropic.Sigma(3, 1e-2); % was 0.1
noiseBias = noiseModel.Isotropic.Sigma(6, metadata.imu.epsBias); % between on biases
noisePriorBias = noiseModel.Isotropic.Sigma(6, 1e-6);
noisePriorBias = noiseModel.Diagonal.Sigmas([metadata.imu.BiasAccelerometerSigma * ones(3,1); ...
metadata.imu.BiasGyroscopeSigma * ones(3,1)]);
sigma_accel = metadata.imu.AccelerometerSigma;
sigma_gyro = metadata.imu.GyroscopeSigma;
@ -70,7 +72,7 @@ noiseVectorPose = [sigma_ang * ones(3,1); sigma_cart * ones(3,1)];
noisePose = noiseModel.Diagonal.Sigmas(noiseVectorPose);
%% Set log files
testName = sprintf('sa-%1.2g-sc-%1.2g',sigma_ang,sigma_cart)
testName = sprintf('sa-%1.2g-sc-%1.2g-sacc-%1.2g-sg-%1.2g',sigma_ang,sigma_cart,sigma_accel,sigma_gyro)
folderName = 'results/'
%% Create ground truth trajectory and measurements
@ -85,11 +87,15 @@ gtNoiseModels.noisePriorPose = noisePose;
gtNoiseModels.noisePriorBias = noisePriorBias;
% Set measurement noise to 0, because this is ground truth
gtMeasurementNoise.poseNoiseVector = [0; 0; 0; 0; 0; 0;];
gtMeasurementNoise.imu.accelNoiseVector = [0; 0; 0];
gtMeasurementNoise.imu.gyroNoiseVector = [0; 0; 0];
gtMeasurementNoise.cameraPixelNoiseVector = [0; 0];
gtMeasurementNoise.poseNoiseVector = zeros(6,1);
gtMeasurementNoise.imu.accelNoiseVector = zeros(3,1);
gtMeasurementNoise.imu.gyroNoiseVector = zeros(3,1);
gtMeasurementNoise.cameraPixelNoiseVector = zeros(2,1);
% Set IMU biases to zero
metadata.imu.accelConstantBiasVector = zeros(3,1);
metadata.imu.gyroConstantBiasVector = zeros(3,1);
gtGraph = imuSimulator.covarianceAnalysisCreateFactorGraph( ...
gtMeasurements, ... % ground truth measurements
gtValues, ... % ground truth Values
@ -135,6 +141,15 @@ monteCarloMeasurementNoise.cameraPixelNoiseVector = [0; 0];
for k=1:numMonteCarloRuns
fprintf('Monte Carlo Run %d.\n', k');
% Create a random bias for each run
if options.imuNonzeroBias == 1
metadata.imu.accelBiasVector = metadata.imu.BiasAccelerometerSigma .* randn(3,1);
metadata.imu.gyroBiasVector = metadata.imu.BiasGyroscopeSigma .* randn(3,1);
else
metadata.imu.accelConstantBiasVector = zeros(3,1);
metadata.imu.gyroConstantBiasVector = zeros(3,1);
end
% Create a new graph using noisy measurements
graph = imuSimulator.covarianceAnalysisCreateFactorGraph( ...
gtMeasurements, ... % ground truth measurements

6
matlab/unstable_examples/+imuSimulator/covarianceAnalysisCreateFactorGraph.m
View File

@ -70,9 +70,11 @@ for i=0:length(measurements)
% Generate IMU measurements with noise
for j=1:length(measurements(i).imu) % all measurements to preintegrate
imuAccel = measurements(i).imu(j).accel ...
+ (measurementNoise.imu.accelNoiseVector .* randn(3,1)); % added noise
+ (measurementNoise.imu.accelNoiseVector .* randn(3,1))... % added noise
+ metadata.imu.accelConstantBiasVector; % constant bias
imuGyro = measurements(i).imu(j).gyro ...
+ (measurementNoise.imu.gyroNoiseVector .* randn(3,1)); % added noise
+ (measurementNoise.imu.gyroNoiseVector .* randn(3,1))... % added noise
+ metadata.imu.gyroConstantBiasVector; % constant bias
% Preintegrate
imuMeasurement.integrateMeasurement(imuAccel, imuGyro, measurements(i).imu(j).deltaT);