Yuan-Chu Tai

PrecLand: support LANDING_TARGET ext field

3

This PR add support for LANDING_TARGET mavlink2 position extension field. For companion computer using fiducial markers, it makes FC integration easier. I will do more tests once weather condition is...

Copter: use 3d vector from plnd to slow down

5

This PR allows `distance` field in [LANDING_TARGET](https://mavlink.io/en/messages/common.html#LANDING_TARGET) been used to slow down descend speed. It is tested with CubeBlack in RTL [2022-08-25 10-24-58.zip](https://github.com/ArduPilot/ardupilot/files/9542345/2022-08-25.10-24-58.zip) Hi @kapacheuski , would you mind taking...

http://uav.ust.hk/storage/opencv2.framework.zip I did not come from mainland china, so I think it is not about wall? 

add 3x3 rotation matrix to quaternion function

2

In https://github.com/AprilRobotics/apriltag/issues/90#issuecomment-656802651, @mkrogius suggests using `doubles_mat_to_quat` to get a quaternion from the matrix. However, rotation matrix in `apriltag_pose_t` is a 3x3 matrix and `doubles_mat_to_quat` expects a 4x4 matrix. It would...