Questions tagged [accelerometer]

Accelerometer is a sensor that measures acceleration.

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8
votes
4answers
2k views

Why do 3-axis accelerometers seemingly have a left-handed coordinate system?

Careful inspection of page 35 (figure 58) of the ADXL345 datasheet shows that under gravitational loading only, the chip uses a left-handed coordinate system. My own experiments with this chip ...
5
votes
1answer
8k views

calculating position based on accelerometer data

Please help me with the following task. I have MPU 9150 from which I get acceleration/gyro and magnetometer data. What I'm currently interested in is to get the orientation and position of the robot. ...
6
votes
3answers
37k views

How to estimate yaw angle from tri-axis accelerometer and gyroscope

I would like to estimate the yaw angle from accelerometer and gyroscope data. For roll and pitch estimate I've used the following trigonometric equations: ...
5
votes
2answers
2k views

How much accuracy could I get position tracking with a 3-axis accelerometer and gyro sensor, and compass, and how would I do it?

Given a 12' x 12' field (4m x 4m), a reasonably cheap 3-axis gyro sensor and accelerometer, and compass, I plan to design a device capable of tracking its position to sub-centimeter accuracy for a ...
3
votes
2answers
102 views

How reliable are IMUs for a long usage (6 hours) rotation (only) tracking?

I know they are bad for positional tracking and drift from actual position over time but would like to know what is the situation with rotation only. I know Oculus DK1 used ordinary off-the-shelf ...
-2
votes
2answers
521 views

Displacement with accelerometer [duplicate]

I want to use a sensor to find displacement with accelerometer. How can I use accelerometer to find displacement? I want to use this for a quadcopter.
5
votes
3answers
14k views

Quadcopter Position Measurement (Accelerometer, GPS or Both)?

I previously thought that an accelerometer on a quadcopter is used to find the position by integrating the data got from it. After I read a lot and watched this Youtube video (specifically at time 23:...
5
votes
2answers
2k views

Accelerometer calibration - how to get cross-axis sensitivities

I've already asked a related question (accelerometer bias removal) here on robotics and got a bit better results on corrected accelerometer output. To get even better results I found the calibration ...
7
votes
1answer
7k views

How are units of noise measurement related to units of a sensor's data measurement?

I'm trying to understand how noise is represented for accelerometers, gyroscopes, and magnetometers so that I can match the requirements of my project with the standard specs of these sensors. I ...
2
votes
3answers
395 views

Localising a robot placed at an unknown position in a known environment

I am a third-year electrical engineering student and am working on an intelligent autonomous robot in my summer vacations. The robot I am trying to make is supposed to be used in rescue operations. ...
0
votes
1answer
398 views

How to transform raw accelerometer data into the Earth fixed frame to determine position

I have data from a TeleMega and do not understand how to apply the rotation matrix for the accelerometer data so that I can get the more accurate position estimate from my accelerometer. My data comes ...
2
votes
2answers
3k views

Accelerometer bias removal

I found a good explanation on how to remove accelerometer bias (when on flat table only one axis should show values, the other two should be 0). I've calculated S and B factors (page 3): Record $...