feat: radar object fusion

perception/radar_fusion_to_detected_object/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+project(radar_fusion_to_detected_object)
+
+## Compile options
+if(NOT CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+  set(CMAKE_CXX_EXTENSIONS OFF)
+endif()
+
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+
+## Dependencies
+find_package(autoware_cmake REQUIRED)
+autoware_package()
+
+## Targets
+ament_auto_add_library(radar_object_fusion_to_detected_object_node_component SHARED
+  src/radar_object_fusion_to_detected_object_node/radar_object_fusion_to_detected_object_node.cpp
+  src/radar_fusion_to_detected_object.cpp
+)
+
+rclcpp_components_register_node(radar_object_fusion_to_detected_object_node_component
+  PLUGIN "radar_fusion_to_detected_object::RadarObjectFusionToDetectedObjectNode"
+  EXECUTABLE radar_object_fusion_to_detected_object_node
+)
+
+## Tests
+if(BUILD_TESTING)
+  list(APPEND AMENT_LINT_AUTO_EXCLUDE ament_cmake_uncrustify)
+
+  find_package(ament_lint_auto REQUIRED)
+  ament_lint_auto_find_test_dependencies()
+endif()
+
+## Package
+ament_auto_package(
+  INSTALL_TO_SHARE
+    config
+    launch
+)

perception/radar_fusion_to_detected_object/README.md

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+# radar_fusion_to_detected_object
+
+This package contains a sensor fusion module for radar-detected objects and 3D detected objects. The fusion node can:
+
+- Attach velocity to 3D detections when successfully matching radar data. The tracking modules use the velocity information to enhance the tracking results while planning modules use it to execute actions like adaptive cruise control.
+- Improve the low confidence 3D detections when corresponding radar detections are found.
+
+![process_low_confidence](docs/radar_fusion_to_detected_object_6.drawio.svg)
+
+## Core algorithm
+
+The document of core algorithm is [here](docs/algorithm.md)
+
+### Parameters for sensor fusion
+
+| Name                     | Type   | Description                                                                                                                                                                | Default value |
+| :----------------------- | :----- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------------ |
+| bounding_box_margin      | double | The distance to extend the 2D bird's-eye view Bounding Box on each side. This distance is used as a threshold to find radar centroids falling inside the extended box. [m] | 2.0           |
+| split_threshold_velocity | double | The object's velocity threshold to decide to split for two objects from radar information (currently not implemented) [m/s]                                                | 5.0           |
+
+### Weight parameters for velocity estimation
+
+To tune these weight parameters, please see [docs/algorithm.md](document) in detail.
+
+| Name                                 | Type   | Description                                                                                                                                                                             | Default value |
+| :----------------------------------- | :----- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------------ |
+| velocity_weight_average              | double | The twist coefficient of average twist of radar data in velocity estimation.                                                                                                            | 0.0           |
+| velocity_weight_median               | double | The twist coefficient of median twist of radar data in velocity estimation.                                                                                                             | 0.0           |
+| velocity_weight_min_distance         | double | The twist coefficient of radar data nearest to the center of bounding box in velocity estimation.                                                                                       | 1.0           |
+| velocity_weight_target_value_average | double | The twist coefficient of target value weighted average in velocity estimation. Target value is amplitude if using radar pointcloud. Target value is probability if using radar objects. |
+| 0.0                                  |
+| velocity_weight_target_value_top     | double | The twist coefficient of top target value radar data in velocity estimation. Target value is amplitude if using radar pointcloud. Target value is probability if using radar objects.   | 0.0           |
+
+### Parameters for fixed object information
+
+| Name                     | Type  | Description                                                                                                                                             | Default value |
+| :----------------------- | :---- | :------------------------------------------------------------------------------------------------------------------------------------------------------ | :------------ |
+| convert_doppler_to_twist | bool  | Convert doppler velocity to twist using the yaw information of a detected object.                                                                       | false         |
+| threshold_probability    | float | If the probability of an output object is lower than this parameter, and the output object doesn not have radar points/objects, then delete the object. | 0.4           |
+
+## radar_object_fusion_to_detected_object
+
+Sensor fusion with radar objects and a detected object.
+
+- Calculation cost is O(nm).
+  - n: the number of radar objects.
+  - m: the number of objects from 3d detection.
+
+### How to launch
+
+```sh
+ros2 launch radar_fusion_to_detected_object radar_object_to_detected_object.launch.xml
+```
+
+### Input
+
+| Name                    | Type                                                 | Description                                                            |
+| ----------------------- | ---------------------------------------------------- | ---------------------------------------------------------------------- |
+| `~/input/objects`       | autoware_auto_perception_msgs/msg/DetectedObject.msg | 3D detected objects.                                                   |
+| `~/input/radar_objects` | autoware_auto_perception_msgs/msg/TrackedObjects.msg | Radar objects. Note that frame_id need to be same as `~/input/objects` |
+
+### Output
+
+| Name               | Type                                                  | Description                    |
+| ------------------ | ----------------------------------------------------- | ------------------------------ |
+| `~/output/objects` | autoware_auto_perception_msgs/msg/DetectedObjects.msg | 3D detected object with twist. |
+
+### Parameters
+
+| Name           | Type   | Description           | Default value |
+| :------------- | :----- | :-------------------- | :------------ |
+| update_rate_hz | double | The update rate [hz]. | 20.0          |
+
+## radar_scan_fusion_to_detected_object (TBD)
+
+TBD

perception/radar_fusion_to_detected_object/config/radar_object_fusion_to_detected_object.param.yaml

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+/**:
+  ros__parameters:
+    node_params:
+      update_rate_hz: 10.0
+
+    core_params:
+      bounding_box_margin: 2.0
+      split_threshold_velocity: 5.0
+      velocity_weight_average: 0.0
+      velocity_weight_median: 0.0
+      velocity_weight_min_distance: 1.0
+      velocity_weight_target_value_average: 0.0
+      velocity_weight_target_value_top: 0.0
+      convert_doppler_to_twist: false
+      threshold_probability: 0.4

perception/radar_fusion_to_detected_object/docs/algorithm.md

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+## Common Algorithm
+
+### 1. Link between 3d bounding box and radar data
+
+Choose radar pointcloud/objects within 3D bounding box from lidar-base detection with margin space from bird's-eye view.
+
+![choose_radar](radar_fusion_to_detected_object_1.drawio.svg)
+
+### 2. [Feature support] Split the object going in a different direction
+
+- Split two object for the low confidence object that can be estimated to derive two object.
+
+![process_low_confidence](radar_fusion_to_detected_object_4.drawio.svg)
+
+### 3. Estimate twist of object
+
+Estimate twist from chosen radar pointcloud/objects using twist and target value (Target value is amplitude if using radar pointcloud. Target value is probability if using radar objects).
+First, the estimation function calculate
+
+- Average twist for radar pointcloud/objects.
+- Median twist for radar pointcloud/objects.
+- Twist for radar pointcloud/objects nearest of the center of bounding box in velocity.
+- Weighted average twist with target value of radar pointcloud/objects.
+- Twist with max target value of radar pointcloud/objects.
+
+Second, the estimation function calculate weighted average of these list.
+Third, twist information of estimated twist is attached to an object.
+
+![estimate_doppler_velocity](radar_fusion_to_detected_object_2.drawio.svg)
+
+### 4. [Feature support] [Option] Convert doppler velocity to twist
+
+If the twist information of radars is doppler velocity, convert from doppler velocity to twist using yaw angle of DetectedObject.
+Because radar pointcloud has only doppler velocity information, radar pointcloud fusion should use this feature.
+On the other hand, because radar objects have twist information, radar object fusion should not use this feature.
+
+![process_high_confidence](radar_fusion_to_detected_object_3.drawio.svg)
+
+### 5. Delete objects with low probability
+
+- Delete low confidence objects that do not have some radar points/objects.
+
+![process_low_confidence](radar_fusion_to_detected_object_5.drawio.svg)