sl-perception
c76d5b0dd7
New package saltybot_pose_fusion — EKF fusing UWB+IMU absolute pose,
visual odometry velocity, and raw IMU into a single authoritative pose.
pose_fusion_ekf.py (pure Python, no ROS2 deps):
PoseFusionEKF — state [x, y, θ, vx, vy, ω], 6-state EKF.
- predict_imu(ax_body, ay_body, omega, dt): body-frame IMU predict step
with Jacobian F, bias-compensated accel, process noise Q.
- update_uwb_position(x, y, sigma_m): absolute position measurement
(H=[1,0,0,0,0,0; 0,1,0,0,0,0]) from UWB+IMU fused stream.
- update_uwb_heading(heading_rad, sigma_rad): heading measurement.
- update_vo_velocity(vx_body, omega, ...): VO velocity measurement —
body-frame vx rotated to world via cos/sin(θ), updates [vx,vy,ω] state.
- Joseph-form covariance update for numerical stability.
- Dual dropout clocks: uwb_dropout_s, vo_dropout_s (reset on each update).
- Velocity damping when uwb_dropout_s > 2s.
- Sensor weight parameters: sigma_uwb_pos_m, sigma_uwb_head_rad,
sigma_vo_vel_m_s, sigma_vo_omega_r_s, sigma_imu_accel/gyro,
sigma_vel_drift, dropout_vel_damp.
pose_fusion_node.py (ROS2 node 'pose_fusion'):
- Subscribes: /imu/data (Imu, 200Hz → predict), /saltybot/pose/fused_cov
(PoseWithCovarianceStamped, 10Hz → position+heading update, σ extracted
from message covariance when use_uwb_covariance=true), /saltybot/visual_odom
(Odometry, 30Hz → velocity update, σ from twist covariance).
- Publishes: /saltybot/pose/authoritative (PoseWithCovarianceStamped),
/saltybot/pose/status (String JSON, 10Hz).
- TF2: map→base_link broadcast at IMU rate.
- Suppresses output when uwb_dropout_s > uwb_dropout_max_s (10s).
- Warns (throttled) on UWB/VO dropout.
config/pose_fusion_params.yaml: sensor weights + dropout thresholds.
launch/pose_fusion.launch.py: single node launch with params_file arg.
test/test_pose_fusion_ekf.py: 13 unit tests — init, predict, UWB/VO
updates, dropout reset, covariance shape/convergence, sigma override.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
36 lines
1.2 KiB
XML
36 lines
1.2 KiB
XML
<?xml version="1.0"?>
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<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
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<package format="3">
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<name>saltybot_pose_fusion</name>
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<version>0.1.0</version>
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<description>
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Multi-sensor EKF pose fusion node (Issue #595).
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Fuses UWB+IMU absolute pose (/saltybot/pose/fused_cov), visual odometry
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(/saltybot/visual_odom), and raw IMU (/imu/data) into a single authoritative
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map-frame PoseWithCovarianceStamped on /saltybot/pose/authoritative with
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TF2 map→base_link broadcast.
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</description>
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<maintainer email="sl-perception@saltylab.local">sl-perception</maintainer>
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<license>MIT</license>
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<buildtool_depend>ament_python</buildtool_depend>
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<depend>rclpy</depend>
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<depend>std_msgs</depend>
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<depend>sensor_msgs</depend>
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<depend>nav_msgs</depend>
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<depend>geometry_msgs</depend>
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<depend>tf2_ros</depend>
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<exec_depend>python3-numpy</exec_depend>
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<test_depend>ament_copyright</test_depend>
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<test_depend>ament_flake8</test_depend>
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<test_depend>ament_pep257</test_depend>
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<test_depend>python3-pytest</test_depend>
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<export>
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<build_type>ament_python</build_type>
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</export>
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</package>
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