Questions tagged [position]

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EKF not providing good position estimation

I am working on a robotics project and I am using the package robot_localization in ROS2. I am trying to fuse the wheel odometry and IMU data, but I am struggling a lot to make it work. I've read a ...
João Victor Aguiar's user avatar
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How do I send a new position to my 5 dof robot arm?

I am a newbie with ros2 control. I am using ros2 iron on Ubunto 22.04 (Linux Mint). I made a copy of the ros2_control demo example #7. This is the one that is launched with the command ...
Jeffrey Edward Messikian's user avatar
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VRX wamv position using ROS2

I need information about the instant position of the wamv (osrf/vrx). Using ROS1 + Gazebo11 it works in general properly: ...
sendilkelm's user avatar
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Confusion in how to start solving such problems

A coordinate frame (2) is attached to a body with origin 02 at the position [x(t) y(t) z(t)] transpose from the base frame (1). Apart from translation. the frame is rotating about the x1 axis by an ...
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The tf transform between base_footprint of robot1 and base_footprint of robot1 have little errors on multi-robot systems?

Hello,everyone!Right now I'm doing some some simulations about multi-robot systems on Gazebo and what I have achieved are: (1)I can launch multiple robots(for instance,2 robots) on Gazebo (2)I can use ...
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Getting odom transform same as RVIZ (Python)

Hi, I'm trying to get the XYZ position of the odom frame. In particular I just want the xy position, not fussed about height change (z). As you can see in the picture, only one of the values is close, ...
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Navigation of robot to goal point/Turning until robot faces goal-direction

SOLVED See Solution at the end of post Problem: Hey there, I'm currently working on a project about navigating a robot to a goal point. I already wrote some code to tackle this task. The code uses the ...
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Calculate position of robot

Hi, I would like to know if there is a method to calculate the position of a robot based on angular velocity and accelerations. I would like, from a start position, to move my robot and, based on ...
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2 answers
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How can I find the index of the cell from map coordinates?

Hi I have the (x,y,z) position of the map. From that information, how can I find the cell index and also costmap value(free, obstacle ...) related to this coordinates ? thanks Originally posted by ...
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2 answers
5 views

ardrone2.0s coordinate system

Hy community! I am writing my thesis at the university about Localization and navigation of ARDrone 2.0. I have read all of the available topics and documentations for the ros support of ardrone, but ...
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Canopen Position Control Without Mode 7

I tried to control my own robot arm using moveit by canopen protocol, but my driver is not supported to use interpolate position mode, which is mode 7. It only has profiled position mode, profiled ...
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Get Modelstate Information for Turlebot

Hello Guys, I run ros Kinetic with gazebo 7.0. My project is a turtlebot who should drive to several objects and try to push them away after a try he should drive to the middle of the room again and ...
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1 answer
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roscanopen + cyclic position mode + nanotec controller

Hello all, I have a nanotec integrated servo controller (the PD6-CB87S048030-E-09), with support for CanOpen in DS402 profile. I am wondering about the cyclic synchronous position mode, which is ...
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using JointState.position in transformations

Hi all, Can I directly use the joinstate.position[i] for rotation or should there be some processing when rotating successive joints other than the first one? This is with reference to forward ...
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move baxter end effector position regardless of orientation

I downloaded these codes from the link https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwi21LXAvJzTAhUBLcAKHfRNAOgQFggcMAA&...
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How can I get a certern link's position not in rviz?

I want write a certern link position(x,y,z) to a txt file.Which function do i need? Where does the date of link's position store?THX!! Originally posted by Ddj on ROS Answers with karma: 1 on 2017-03-...
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How to get joint position(x,y,z) of a robotic arm

I know that I can get joint angles of each joint from /joint_state topic of a urdf robotics arm. How to get a joint position(x,y,z) of each joint.Whether there is any other topic publishing it? ...
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sensor position amcl

Hey everyone, how i can tell AMCL the position of my laserscanner? the sensor is not in the centre of the robot. so everytime the robot turns, the amcl loses the orientation. Thank you very much! Link ...
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1 answer
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How to plot position(x y z) and velocity of fixed frames(end-effector) in rqt?

hi . i need answer to complete my Master's thesis. i want plot position and velocity of end effector that have fixed joint using rqt. How to plot position(x y z) and velocity of fixed frames(end-...
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1 answer
5 views

How to get laser data in gazebo?

Hi everyone I have created my diff drive robot and also mounted laser on the robot using Hokuyo model. Now I need to move my robot from start position to the goal position. I can't understand how to ...
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Why joint position controller is not sensitive to changing PID gains?

Dear Ros Users I'm going to use ziegler-nichols method to tune PID gains of an simple inverted pendulum model. I'm wondering why my controller whom type is "position_controllers/...
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1 answer
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How to get robot position in gazebo?

I want get the robot position(something like the coordinate x,y,z) , I know that hector_gazebo_plugins can do this,but I don't know how to use the API,did something more simple to get the robot ...
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1 answer
29 views

SLAM - detect initial position

Hello there, I just performed SLAM with navigation_stack and V-REP simulator. As I know for know, we should give initial position of the robot so that AMCL performs localization and costmaps are ...
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1 answer
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How to get gazebo topic using c++ and ros?

Hi, I am using ROS, gazebo and c++ together to perform some tasks. In gazebo I launched "turtlebot_world.launch. It published " /gazebo/default/pose/info " which gives the information ...
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Turtlebot 2 map postition

Hi Everyone, is there a way to make turtlebot move autonomously to its exact position in the map given? I am working with multiple turtlebots but I need to make them calculate its postion so that way ...
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1 answer
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Obstacle Position

Hi there, Is it possible to obtain the co-ordinates of an obstacle that we manually add in Gazebo ? I want to write a ros node such that the user adds the obstacle initially and then the node obtains ...
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1 answer
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Robot_Localization: IMU doesn't update position

Hi, I'm using the robot_localization package with my phidgetspatial 3/3/3. I know I need more sensors than just an IMU for localization, but as I wait for those to be shipped to me I decided to play ...
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2 answers
9 views

ROS compatibility for accurate UWB positioning sensor [discussion]

Hello, my name is Samuel and I am one of the creators of Pozyx, an indoor positioning system that I would like to make ROS compatible. Our system is currently running on kickstarter. We are using ...
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1 answer
30 views

IMU linear acceleration to position

Hey guys, I have IMU 3dm_GX2 and I want to get position from it. I know that there will be accumulated error and will not be accurate but I need to get the best out of it. I excluded the gravity ...
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1 answer
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robot_localization

I am trying to use robot_localization package to stimate the position of my robot. First I am going to explain what I have. Sensors: IMU publishing sensor_msgs::Imu publishing in /imu_rectificada ...
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schunk_svh_driver : How I can read current position?

Hi, I want to read current position and the value of current at every instant to control the grasps online. Can you help me? Thank you! Originally posted by Alba on ROS Answers with karma: 20 on 2015-...
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2 answers
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Moving a box using tf

Hi to all, I try to move a box in my planning scene using a tf-frame. But it's not working at the moment. I insert the box as shown in the moveit-tutorial and giving it a tf-frame additionally like ...
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1 answer
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turtlebot position fluctuates

Dear All, Please have look on this video: http://youtu.be/MiTcy0rHY78 I'm running turtlebot gazebo simulator, but as you see the pose of robot has lots of error and fluctuates I have run the following:...
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1 answer
12 views

Rviz urdf robot update position

I have been trying to set the position and orientation of my table in Rviz after launch. The table is represented by a URDF model (as can be seen in the picture bellow). The reason for choosing a URDF ...
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1 answer
3 views

StampedTransform getting Position instead of Relative Position

HI, I am trying to log some data. The code works like intended except I am receiving the Relative Position instead of the Position. ...
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1 answer
10 views

Robot global position

I want to get the global position of the robot by using rostopic echo /odom/pose/pose after reading through this page https://www.packtpub.com/books/content/navigation-stack-robot-setups. However, I ...
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1 answer
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Position recognition with Kinect

Hi, I’m working on body position recognition using Kinect and openni_tracker, specifically the origin points (x, y and z) of the transformations (head, torso, elbow, hand…) given by the tracker. I ...
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1 answer
4 views

Position of a point on expanding map of GMapping

Hi, I am trying something and I need some help. I have two robots which are mapping the same environment by using separate GMapping algorithms and building separate maps. During the mapping process, I ...
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1 answer
38 views

How do i use ros TF to capture object position based on colour and calculate relative distance?

Hi im currently doing position detection. By using Opencv color(red) detection i detect the red object and now i want to publish it in the tf and show where and the distance between the object and ...
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1 answer
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Conversion Position to float

I got in a variable Position (which I get from transform.getOrigin) and I want to convert it in a pair of float. How can I do that? I'm in Hydro, Ubuntu 12.04 and programming in c++ Originally posted ...
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1 answer
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Positioning multi-robot on static map

Hi, I make a package with two Turtlebots and share a static map on Gazebo. My problem is that I can positionning Turtlebots where I want on a static global map. I use GMapping and MoveBase and I try ...
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1 answer
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ar_pose : interprete output of 'ar_pose_marker' && transform

Hello. I want to track a object that is moving inside a room and color the pixel in the cam-image, where the object has moved to. Instead of detect colors etc. I want to do this with markers from ...
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1 answer
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Calculate covariance matrix from x,y,z data of /odom

I've recorded a bag file from a custom robot (in real world) that does not provide covariane matrix and I want to use /odom to feed an ...
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1 answer
2 views

amcl does not need odometry data?

I'm reading amcl document on ROS Wiki. In its subscribed topics there is not odometry topic, why? It works only with laser? ...
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1 answer
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Any pkg which computes position from IMU

Hi I was wondering if anyone can point me to ros package which can compute position from IMU. I guess by integrating the linear acceleration, one could get that, but wanted to know if there is a ...
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2 answers
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move_base start position is off the global costmap

Hi all, after following this tutorial http://www.ros.org/wiki/navigation/Tutorials/RobotSetup#Global_Configuration and run rviz when I try to give a 2d nav goal in the map the shell output this error: ...
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[Navigation] problem: how to go to a specific location?

Hello all My goal is to move my robot in gazebo to a specific location {x,y,z} coordinate. I have already investigated the navigation stack. Are there any easier way to archeive this goal? Thank you ...
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1 answer
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Can't get correct position of ARMarkers

Hi everyone! I'm using ar_pose to identify some markers. It identifies the markers correctly (pattern 1, 2, etc.), but their positions are not very good. The distance is not being correctly assigned. ...
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1 answer
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remote rviz does not set pose or goal

I am testing navigation stack on my robot using rviz remotely. Rviz shows all the data from the robot without errors. But when I try to set robot position or goal position nothing happens. If I use ...
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1 answer
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position and orientation of the vector

Hello I went through tf tutorial and some questions here http://answers.ros.org/question/39250/getting-the-position-and-the-pose-of-robot-using-tf_listener/) . I assume that my robot is an rectangle ...
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