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Questions tagged [errors]

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1
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1answer
25 views

How does structural/installation errors have to be modelled in a gyroscope IMU?

I have the model for a gyroscope from an IMU given by $$ \omega_{meas} = (I-S)\omega_{true} + \beta + v $$ $S$ is the scaling and misalignment of the sensor, which I understand is a parameter I get ...
0
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1answer
48 views

State of the art trajectory for fine precision robots

Which kind of trajectory would one use for a fine precision robot? I know trapezoidal and cubic trajectories, but errors get very high when stopping at every configuration and when speeding up to ...
1
vote
1answer
412 views

Process noise and Measurement noise in Kalman filter

I am doing the robot localisation project. Now I stuck on the effect of measurement and process noise in Kalman filtering. Could you please explain what impacts they have while estimating the position ...
1
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2answers
3k views

Camera selection for long range stereo vision system (up to 100 meters)

I want to implement a real-time stereo vision system for long range (up to 100m) depth estimation. I know that there are some general considerations as described in this SOV post. I have seen some ...
2
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0answers
383 views

real-time stereo vision system for long range (up to 100m) depth estimation

I want to implement a FPGA-based real-time stereo vision system for long range (up to 100m) depth estimation. Also, I want to use two ip cameras in the system. I have calculated depth error using the ...
1
vote
1answer
163 views

Illegal position data with Mitsubishi Melfa RV-2F-Q robotic arm

I have a project where I have to move a Mitsubishi Melfa RV-2F-Q robot to a position/orientation from an external source, so there are no pre-defined points available. The problem I keep running into ...
0
votes
2answers
84 views

Is there any error analysis of Irobot Create 2?

I am curious about the travelling distance/turning angle accuracy of Irobot Create 2. E.g., if the program let Create 2 go forward for 10 m, will Create 2 go forward exactly 10 m? What is the ...
1
vote
1answer
767 views

How to compute the error function in graph SLAM for 3D poses?

Given a pose $x_i = (t_i, q_i)$ with translation vector $t_i$ and rotation quaternion $q_i$ and a transform between poses $x_i$ and $x_j$ as $z_{ij} = (t_{ij}, q_{ij})$ I want to compute the error ...
11
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1answer
3k views

Ambiguous definition of Error-State (Indirect) Kalman Filter

I am confused by what precisely the term "Indirect Kalman Filter" or "Error-State Kalman Filter" means. The most plausible definition I found is in Maybeck's book [1]: As the name indicates, in ...
4
votes
2answers
1k views

the uncertainty of initializing new landmark in EKF-SLAM

In EKF-SLAM (based-feature map) once the robot senses a new landmark, it is augmented to state vector. As a result, the size of the state vector and the covariance matrix are expanded. My question is ...
3
votes
1answer
244 views

Dynamic tracking precision of UR5/10

I am willing to use a universal robot arm (UR10) in a path following mode. i.e. I have a desired trajectory for the robot's effector and I would like the effector to follow it as close as possible. ...
2
votes
3answers
180 views

Gears in Autodesk Inventor are looking weird

I use Autodesk inventor professional 2014. I design my gears using the design accelerator. However, whenever I create gear trains, parts of certain gears become transparent. This seems completely ...
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 ...
2
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2answers
2k 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 $...
-2
votes
2answers
222 views

What are some common mistakes that robots make? [closed]

Is there a taxonomy of errors that are common in robotics? Things that come to mind but I don't have names for are: Getting stuck in a stable infinite loop Going into an unstable feedback loop (A ...
23
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4answers
13k views

How should emergency stops be wired?

Emergency stops are obviously a good idea on most robots, how should they be wired? What systems should be killed immediately, and what should stay working?