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I feel like this is a duplicate question and I answered something that was pretty much identical recently, but the EKF is combining measurements from two data sources: your IMU and your odometry. You are fusing the absolute yaw value from your IMU, and velocity data from your odometry. So your EKF output poses will have the same "shape" as your raw odometry, but will be at the heading provided by your IMU. If your EKF output was identical to your odometry input, you wouldn't need a filter.