How to do the sensor fusion using the 4 IMU sensors. Here, 4 IMU sensors are used to know the location of every point where the IMUs are placed? I need the location of the every point on a 3D graph where you can see the location of each IMU sensor.
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\$\begingroup\$ Are those 4 identical sensors, or 4 different (e.g. accelerometer, magnetometer, gyro, and GPS receiver)? \$\endgroup\$– anrieffOct 16, 2019 at 12:11
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\$\begingroup\$ I am using a MPU-9250 MEMS IMU sensor for that. \$\endgroup\$– Vivek KarnaOct 16, 2019 at 12:23
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\$\begingroup\$ This isn't sensor fusion for 4 IMUs. This is sensor fusion of the sensors in one IMU and doing it four times (once for each IMU). Look up dead reckoning, particularly its weaknesses. You will probably need extra sensors to reference an absolute position, depending on what you are actually trying to do (VR?) \$\endgroup\$– DKNguyenOct 16, 2019 at 14:00
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Sensor fusion means using the input of multiple (different or similar) sensors to reduce the error compared to using only a single sensor. For MPU-9250, sensor fusion is typically done combining gyroscope, accelerometer and magnetometer data to get to an accurate representation of the orientation of an object in space, rather than its position.
Perhaps - depending on how the 4 IMU are physically related to eachother in space - you could get an approximate idea of their relative positions using different sensor fusion algorithms, but as far as I know, IMU's are typically not used for that.
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\$\begingroup\$ can you tell me which sensors are used to do the positions determination of the things? Like I need to find the positions of the each point in the 3D space. \$\endgroup\$ Oct 17, 2019 at 4:18
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\$\begingroup\$ It really depends on your application and the environment it is in. \$\endgroup\$– GenoilOct 17, 2019 at 13:05