Questions tagged [gps]

GPS (Global Positioning System) is an outdoor localization system that measures time of flight of a radio signal from a number of satellites in earth orbit.

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Convert Vehicle coordinates to World coordinates for positioning

I'm tracking the position of a vehicle along a certain trajectory using the Kalman filter and the idea is to check for improvements in position estimation through fusion of data from multiple sensors (...
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How does sensor fusion help in robot localization

Good day... Sorry for bigner quesion, but really I need some friendly explanation rather than long reference I have 9 dof mpu9250 imu and gps. I found some source that calculate euler angle in ardunio ...
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How to synchronise data for fusion in Kalman from multiple sensors with different timestamp information?

I'm using Kalman filter to track the position of a vehicle and receive position data from 2 sensors: A GPS sensor and an Ultrasonic sensor for which I want to implement sensor fusion into the Kalman. ...
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why we need both vel and acc contribution for actual position?

I was trying to understand multiwii quadcopter code. I started with understanding GPS code. Here is a section of the code where I have doubt. Why actual position = pos + velocity contribution + ...
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Can drone fly in predefined fixed trajectory without GPS

Is it possible to make a drone to fly in fixed altitude and move in fixed trajectory without GPS. (Drone has to move in fixed path which is already defined). I am saying without GPS because drone has ...
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1answer
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A Delivery Drone

I'm building a delivery drone as my final year project. A drone that can deliver a package to offices around my small town autonomously, for my final year project. I would like to know how this drone ...
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Integreation Method In Dr with 3 Sources

I'm searching a navigation method to find my location while dead reckogning (gps signals jammed) with an imu and gsm based navigation results. In short i have 3 sources: Gsm Based Navigation ( gives ...
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1answer
25 views

Library for GPS

Is there any difference between "tinyGPS++.h","tinyGPS.h", and "Adafruit_GPS.h"? Can I use the same code to extract the current GPS location for all these libraries?
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1answer
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Autonomous Navigation Bot [duplicate]

I'm trying to build an Autonomous parcel delivering rover using GPS.So after giving destination coordinates, I don't know how to make the robot understand to which direction it should move. Basically, ...
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Navigation - GPS + IMU; how to make it more accurate?

Currently, I am trying to navigate a small robot car to point A from my current position. The car has a GPS sensor and a BNO055 IMU(Gyro + Mag + Acc). I know the GPS co-ordinates of point A. Using the ...
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1answer
85 views

How is the GPS fused with IMU in a kalman filter?

I've been trying to understand how a Kalman filter used in navigation without much success, my questions are: The gps outputs latitude, longitude and velocity. While the IMU outputs acceleration and ...
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Sending RTCM corrections from u-center NTRIP Server (Windows) to ROS NTRIP client (Linux)

I'm trying to set up an RTK GPS (NEO-M8P) but I need to send corrections using NTRIP. For my initial tests, I installed the u-center application on a Windows computer as my base station and then I ...
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1answer
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How to accurately navigate from one GPS coordinate to another using just GPS & IMU? [duplicate]

I'm looking for ways to accurately navigate from one GPS location to another. I have a GPS sensor and an IMU. I can calculate the distance with the help of GPS I believe and with the help of ...
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1answer
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Drones classification based on flying mechanism and communication link

I am confused about autonomous drone flight. Thats why I am asking the question here so that a drone expert can help me to understand. I have heard about tow kinds of drone drones that work through ...
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70 views

Easy cm accurate GNSS / GPS for rover with base station? [closed]

I am trying to design a system to measure snow depth during snow production on a tiny ski resort in Denmark. My idea is simple: Drive a rover over the ground during the summer, and obtain height ...
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Kalman filter for slow ground vehicle with RTK

I have been using dual RTK receivers for my tractor projects. This gives me reliable position, heading, and tilt at low rates (10 Hz). I recently began working with an INS (an Advanced Navigation ...
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2answers
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What are good options for modifying drones?

I'm apart of a group at my University where we would like to build a drone/UAV and constantly add and modify parts on it. We were thinking of using an Arduino or raspberry pi, but we really don't ...
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1answer
142 views

GPS/ 1GYRO - 2D + ACCEL+GPSEKF

I am trying to integrate GPS and IMU but as a first step I am trying to use just 1d gyro and 2d accelerometer to work. Below is my model - State model and propagation So, my question is .. after ...
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Create a dummy GPS

Im currently working on a small robot that uses an ardupilot for its control. As Im working indoor, I can't use a real GPS so I'm making a dummy GPS based on UWB. From UWB I get a position at +/- ...
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Robotic vessel navigation using GIS datasets

I am trying to build an autonomous vessel able to plan the best route to a certain waypoint or to follow a pre-defined route. Currently, I have imported Esri GIS files containing elevation data (...
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1answer
346 views

I fused a GPS and IMU and I am wondering if my results make sense

I am trying to fuse a ublox M8 (https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_(UBX-13003221)_Public.pdf) with a MicroStrain IMU (http://www.microstrain....
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1answer
446 views

How to build an autonomous navigation system for robots?

I like to know can we make a web site or application(or using something free like google map) to routing a way and our robot can follow the line exactly? For example I like to build a quad-copter and ...
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1answer
2k views

Kalman filter GPS + IMU fusion get accurate velocity with low cost sensors

I'm new to all this robotics stuff. Especially to Kalman filter. My initial goal is to have velocity as accurate as possible Here is my case: I have a phone which is mounted, for example in the ...
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1answer
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Differential GPS

I want to use DGPS on a robot. I understand how DGPS works but I am having trouble figuring out what specific hardware I need. Is there a good resource for how to actually setup DGPS? Thanks for your ...
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1answer
4k views

Ardupilot on Raspberry Pi

I'm making a quadcopter for the first time and want to be as low cost as possible, and when it comes to flight controllers APM is the best open-source project, and is compatible with Raspberry Pi. My ...
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3answers
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Does multiple IMU increase accuracy

I'm just starting up with IMU's and I really want to work on my own flight controller, but a question always hits my mind and I am not able to find answer anywhere, so I'm here. Will multiple IMUs ...
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1answer
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Confused about time systems in ephemeris computation (from GPS subframes)

I am using the gnss-sdr library to compute ephemeris from the GPS message, and to try to make sense of things, I am reading the well-known IS-GPS-200E specification. To compute ephemeris, the time ...
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2answers
372 views

GPS message: compute ephemeris data and pseudo-ranges from subframes

I have raw GPS data (see end of the question for details if you think the protocols are relevant), and I need to extract/compute ephemeris and pseudoranges (my goal is to replace the recursive least ...
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1answer
30 views

Recording GPS position [closed]

I build 3d models using Agisoft and need to record the position of the Ground Control Points as accurately as possible, latitude , longitude and altitude. What is the best way of doing this?
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1answer
199 views

Cheapest GPS that is accurate to ca. 30cm in woodland

As part of my PhD field work it would be useful to have latitude/longitude measurements for the locations of ant nests that I am working on. These ant nests can be as close as 50cm together so the ...
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2answers
6k views

Kalman Filter GPS + IMU

I know this probably has been asked a thousand times but I'm trying to integrate a GPS + Imu (which has a gyro, acc, and magnetometer) with an Extended kalman filter to get a better localization in my ...
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3answers
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Integrating GPS into Graph SLAM (how orientation fixed?)

I'm working on Graph SLAM to estimate robot poses (x, y, z, roll, pitch, yaw). Now I want to integrate GPS measurement (x, y, z, of course no angles). I implemented GPS as pose's prior. But I have a ...
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2answers
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Differential GPS or Simple GPS for Robot navigation and odometry?

I am building a rover which can navigate autonomously. I do not want to use wheel encoders for generating robot odometry since it causes drifts due to slippage etc. I want to use GPS for generating ...
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3answers
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Conversion GPS (longitude,latitude) to (x,y) of local reference frame?

I would like to use GPS data as measurement input for an extended kalman filter. Therefore I need to convert from GPS longitude and lattitude to x and y coordinate. I found information about the ...
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1answer
78 views

All-in-one GNSS localization solution (hardware+software) [closed]

Is there something like an all-in-one satellite based localization solution that would contain both hardware and software to do GNSS localization for robotics? I mean a package that would also contain ...
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1answer
485 views

Measuring vehicle's forward and lateral acceleration using a smartphone [closed]

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
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2answers
516 views

Quadcopter heading calculation

I'm working on an autonomous quad copter, I have two GPS co-ordinates (source and destination co-ordinates). I need to move my quad from the source to the destination, for this I need to calculate the ...
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3answers
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imu position without GPS or camera

I have a IMU that has 3-axis accelerator, 3-axis magnetometer, 3-axis gyroscope and row, yaw, pitch value. I want to get the location of the IMU coordinate(the beginning point is (0,0,0)) but I know ...
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2answers
317 views

Path following with precise positioning system (RTK) [closed]

Is there any general problem in using precise positioning (centimeter-accurate GNSS RTK system meant) for autonomous car guidance given I have a predefined path the car should follow? I mean, ...
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3answers
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How to have a 'Auto Go Home' feature, like the DJI Phantom 3, on a project built quadcopter?

What should a quadcopter have, or have access to, in order to make this 'return home' feature work? Is GPS enough? What is the approach needed to make this happen? I used a Arduino Mega 2560 with IMU ...
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PixHawk or Naza M V2 for Aerial Imaging of Small Study Area with Hexacopter [closed]

I have a project that is going to involve capturing ~80 images of a 35m x 50m agricultural study area for image processing. I am wondering whether to use a NAZA v2 or PixHawk controller to outfit my ...
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2answers
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Open source implementations for GPS+IMU sensor fusion?

Are there any Open source implementations of GPS+IMU sensor fusion (loosely coupled; i.e. using GPS module output and 9 degree of freedom IMU sensors)? -- kalman filtering based or otherwise. I did ...
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1answer
618 views

Solution for INS and GPS integration

I have a GPS module and an IMU (gyro, accelerometer and magnetometer) and I need to build an autonomous navigation system for a quadcopter. It must know its position at any time so that it can track a ...
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1answer
633 views

Are there off the shelf solutions for GPS+INS (accelerometer,gyro,magneto) sensor fusion for getting filtered/fused location and speed output?

I am working on a project that needs tracking location and speed of pedestrians/runners/athletes (so not really robotics, but I see a lot of related usage and posts in the robotics domain, and an ...
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1answer
139 views

How would I implement a following drone with a camera using GPS?

As the title states, is there any way to make a following drone that tracks a GPS unit, and follows/orients camera to that? Similar to this
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1answer
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What is the difference between Positioning and Localization Systems

I would like to know what are the differences between Positioning and Localization Systems. In most review papers they are used interchangeably. Are they the same? For example: GPS(Global Positioning ...
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Datalogging from Arduino Mega to Dropbox

I have an Arduino Mega board and the Adafruit Ultimate GPS Logger + GPS module shield. I have these two connected together using headers and have the entire thing mounted on my drone. Currently, I ...
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463 views

Fusion of GNSS position data and prefused 9-dof AHRS data

Bosch, FreeScale, InvenSense, ST and maybe others are releasing 9-dof AHRS platforms containing their own fusion software and outputting filtered/sane/fused data (attitude as quaternion and linear ...
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1answer
41 views

Sending a smartphone's GPS wireless

I'm building camera device which is able to take pictures of paragliders in mid air. To let the camera know where the glider is I thought about using GPS data from the pilot's smartphone. My ...
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Correcting GPS track with visual odometry (sensor fusion)

I am trying to build low cost and precise outdoor positioning. I explored NS-RAW with RTKLIB - this would be doable but probably will need either a base station to get the correction data for rover or ...