Questions tagged [uav]

Unmanned aerial vehicle. See also the tags ugv & auv.

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36 views

Why do we connect pins 2 and 3 on APM to enable PPM

Why is it necessary to connect signal pins 2 and 3 via jumper on an APM2.8 board to enable PPM. I am using flysky fs-ia6b receiver with the APM mentioned above. Pins 2 and 3 control pitch and ...
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0answers
16 views

Checking for external compass in mission planner

How can I check whether the external compass is really selected for my APM 2.8 using mission planner. The primary purpose of using the external compass is to have less electro magnetic interference ...
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0answers
26 views

Battery weight in quadcopter

We all know that the fly time of a quadcopter is proportional to its weight (and the propellers size, etc), and a high capacity battery is heavy, but also a high capacity battery would make the fly ...
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9 views

Will disconnecting the external compass enable internal compass in APM

Will disconnecting the external compass from an APM 2.8 enable internal compass automatically, if the compass jumper is not disturbed while setting up the external compass, i.e. the external compass ...
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7 views

Data from Optitrack Motive is not getting streamed properly

i'm currently using optitrack motive 1.10.1 version for tracking 3 UAVs. i'm using vrpn streaming to stream the data. im connecting the host pc (on which motive is running) to router using lan and ...
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1answer
17 views

Will a 2.4ghz controller work with a 5.8ghz video transmitter?

I’m building an fpv racing drone and I accidentally ordered a 2.4ghz controller and a 5.8ghz video transmitter. Will they work together? I have 5.8ghz fpv goggles so I assume they will work.
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1answer
19 views

Why 3DR Power Module has two 5v and GND output

Why are there two 5V and GND output in 3DR Power module (https://www.instructables.com/id/Safetly-use-CLONE-APM-Power-Modules/) (https://www.youtube.com/watch?v=M6OSp05Y5b8). Can we power up an APM 2....
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23 views

Best practices for quad-copter designing

What are the some of the best practices for placing the components (including battery, GPS, flight-controller, wires, receiver etc.) on the air-frame of an 'X' quad-copter to ensure the minimum power ...
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1answer
107 views

How is the IMU used in the PixHawk?

Looking at 3DR's Pixhawk hardware on GitHub the FMU and IMU are treated as different pieces of hardware. On the schematics for the FMUs (example) there is limited reference to the IMU. So, is the IMU ...
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2answers
64 views

Are all drone propellers compatible with all brushless motors?

I want to build a drone using these motors SunnySky X2212 KV1400 Brushless Motor For RC Drone FPV Racing Multi Rotor and these propellers DYNAM 2X RC Model Airplanes 9x5 Inch Nylon Propellers ...
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1answer
26 views

Autonomous quadcopter: How to transform setpoint into motor inputs?

I would like to know how to transform a setpoint to inputs for the motors of a quadcopter. I would like a function like that: ...
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15 views

Calculation of quad-copter

Vector rotation around X-axis can be represented as: Rx = \begin{bmatrix}1&0&0\\0&cos(\alpha)&sin(\alpha)\\0&-sin(\alpha)&cos(\alpha)\end{bmatrix} Vector rotation around ...
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34 views

How to identificate uav's roll and pitch model and control to track object?

I'm building a drone distance controller for parrot mambo. I need to track a colored page with given distance and given heigth. I can get the yaw information from parrot mambo with 0.5 sec. Since I ...
2
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1answer
689 views

what is the algorithm to get position (Linear displacement and linear velocity ) using IMU (Like MPU6050)?

So I have been working on a drone project for a very long time, now I decided to work on Kalman filter which is used widely nowadays like Ardupilot. I looked at the source code so basically understand ...
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3answers
310 views

How many independent control inputs does a hexarotor have?

6, because a rigid body has six degrees of freedom 4, since it is similar to a quadrotor, except with more motors 6, because there are six motors I was taking an online quiz, and I thought option 3 ...
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2answers
511 views

If you can create pure yaw motion with a quadcoptor then why won't this work with a tricoptor?

An answer to the question Why are quadcopters more common in robotics than other configurations? said: You need 4 degrees of freedom to control yaw, pitch, roll and thrust. Four props is ...
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2answers
901 views

Guiding a Quadrotor Towards a Target

I am working on a quadrotor. I know its position -- $a$, where I would like to go -- target position $b$, and from that I calculate a vector $c$ -- a unit vector that will take me to my target: <...
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2answers
144 views

How to implement a novel control algorithm for a drone

I and my research team are working on a novel drone design based on trirotor. The difference between this design and a trirotor is that it has an extra propeller to generate additional thrust, ...
4
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1answer
171 views

Compatibilty of my setup?

I'm building my first quadcopter, and these are the components I intend to buy: Motor: EMAX BL2212 1400 KV Brushless Outrunner Motor around 0.9 kg thrust: Flight Controller: Multiwii V2.5 Flight ...
1
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1answer
212 views

Generate a coverage path given a polygon region

I'm making an app which controls a drone (DJI) and takes photos. In one particular feature, the user can draw a polygon (let's keep it a convex quadrilateral for now) and the app should generate a ...
2
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0answers
89 views

Position-Attitude Kalman filter with Quaternions

I want to design an EKF to estimate the position of a UAV. If I were doing this with Euler angles then I would have a state vector that would look like \begin{bmatrix}north&east&down&...
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1answer
948 views

CC3D PWM control signal characteristic (to be simulated by Raspberry PI)

My goal is to control drone by Raspberry PI. The Raspberry PI uses camera and OpenCV, sends control commands to AVR microcontroller which will generate the PWM control signal. Meaning that it will ...
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1answer
56 views

how to write a uav teleop code?

I'm currently working on a teleoperation code for crazyflie. I'm not using a joystick, but I'm using leapmotion and I'm trying to understand how they code for a joystick in order to implement the same ...
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2answers
1k views

How to convert raw Pitot tube readings to air speed in m/s?

I'm building a kite flying robot, for which I want to measure air speed. So I combined a Pitot tube with an ADC and connected it to my Raspberry Pi using this tutorial. It seems to work perfect, in ...
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1answer
2k views

CC3D - Replacing RC emitter with an RPi

I am trying to control a quadcopter using te OpenPilot CC3D board and a RaspberryPi. The main idea was first replace the signals from the RC emitter to the CC3D RC receiver for an RPi connected ...
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1answer
161 views

Generation of a trajectory (position,velocity,acceleration) from velocity

I would like to generate a trajectory for a quadrotor UAV and I am using an architecture which allows to do so only by specifying position, velocity and acceleration. I only know that I want to do a ...
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1answer
246 views

Is MoveIt! suitable for fixed-wing aircraft path planning and obstacle avoidance?

I have seen that it is possible to use MoveIt! for path planning and obstacle avoidance for quadcopters/quadrotors. For example: https://www.youtube.com/watch?v=NRzeQD_Etog https://www.youtube.com/...
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2answers
505 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.
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2answers
334 views

How to measure pull force on a (kite) rope?

I'm building a kite flying robot, in which I've already got some sensors built in. I now also want to measure the pulling force on the rope which is attached to the kite. So I thought of attaching a ...
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2answers
821 views

Possible stabilize Crazyflie 2.0 drone autonomous flight without additional sensors?

I just bought the Crazyflie 2.0 drone. This is my first drone, and it is my first time programming a drone. My first goal is simple: Make the drone hover in place stably for 10 seconds. I found a ...
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1answer
212 views

Utilizing the inertial sensors in an AR Drone

I'm trying to figure out how to use the inertial sensors in an AR Drone to perform a rough version of dead reckoning. I want to move the drone around a room (without flying it) and using the velocity ...
1
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1answer
83 views

How does Amazon ensure its drones are not shot down or captured when in service [closed]

If Amazon plans to deliver packages using drones, how does it ensure the drones reach their destination safely and come back? Won't thieves be able to easily steal packages and drones by shooting them ...
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0answers
69 views

How to precisely land a copter in a defined place? [closed]

Say, I have a flat square landing place for a copter, made of e.g. aluminium or plastic, with marks on it making a square, looking like this from the top: ...
5
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1answer
300 views

Will this pseudocode work as a basis for a flight controller?

I'm programming a flight controller on an Arduino. I've researched how other people have written theirs but without notes it's often so obfuscated that I've decided it will be easier and better to ...
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2answers
155 views

Estimating the displacement of a drone in three dimensions

Assuming a drone is in two dimension, it has to predict its future position by calculating its future displacement: For a real quad-rotor, why should we not only estimate the displacement of a robot ...
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1answer
987 views

Holonomic and Non-holonomic UAV's: Gliders vs Quadcopters

Good day I would just like to ask if a fixed wing aircraft such as a glider(without thrust capability therefore needs external forces such as air flow to move constraining its movement) can be ...
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2answers
101 views

Fixed Wing UAV: Do inherently unstable systems desire to be stable for all cases when a closed loop control is implemented on them?

As we all know fixed wing vehicles are designed to have inherent instability which is what enables all fixed wing vehicles to fly. However does this apply to all cases? Do inherently unstable ...
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4answers
4k views

Why does the Pixhawk have 2 IMUs

I was looking at the Pixhawk specs and noticed that it has 2 different IMUs- Invensense and STM. Is it for redundancy or does it have any other higher purpose?
2
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3answers
128 views

Vision-based Position Estimation for a quadrotor

As a subtask inside a main project I need to compute the position (x,y,z) of a quadrotor using an homography. To do this I will use a camera (attached to the quadrotor) pointing down to an ...
3
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1answer
120 views

How to estimate the position of multiple static ground targets captured from a down facing camera?

An aerial vehicle captures images of the ground using its down facing camera. From the images, multiple targets are converted from their pixel position to the camera reference frame using the pinhole ...
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0answers
60 views

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 ...
2
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1answer
185 views

Implementing a position control for UAV through a flight controller. Plant model is unknown

We are using Naza-M-Lite for our flight controller without GPS. The localization is obtained through our RGB-D camera sensor. We are able to teleoperate and even implement PID controllers for Roll, ...
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1answer
406 views

Are there any aerodynamics modeling/simulation software that is capable to consume a SolidWorks model and to interface with MATLAB/Simulink?

Currently I am developing a control system for an aircraft of a unique design (something in between a helicopter and a dirigible). At this moment I can model only the dynamics of this vehicle without ...
4
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1answer
2k views

The aerial refueling problem: sketch of a feedback controller

At first happy new 2015!!! I'm looking for my next simulator development: a Tanker is flying at constant speed (350 Knots) (no acceleration, no change of altitude or direction). The Tanker is ...
9
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2answers
5k views

Our quadcopter goes forward instead of hovering in place. How to correct it?

I'm trying to do a quadcopter with some friends and we have a problem. It goes forward instead of hovering in place. We made a video to explain it, you can see it here. As you can see, the quadcopter ...
5
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6answers
347 views

Spatial tracking between two UAVs

I have two Unmanned Aerial Vehicles (planes) which work well. They can fly to various waypoints automatically using GPS. Now I would like them to fly together in formation. I would like them to fly ...
3
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2answers
226 views

Do I need an accurate flight model for a UAV?

As I understand it, a Kalman filter uses a mathematical model of the robot to predict the robot's state at t+1. It then combines that prediction with information from sensors to get a better sense of ...
63
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5answers
9k views

Why do I need a Kalman filter?

I am designing an unmanned aerial vehicle, which will include several types of sensors: 3-axis accelerometer 3-axis gyroscope 3-axis magnetometer horizon sensor GPS downward facing ultrasound. A ...
21
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4answers
4k views

Why are quadcopters more common in robotics than other configurations?

I've noticed that almost all research being done with helicopter robots is done using quadcopters (four propellers). Why is there so little work done using tricopters in comparison? Or a different ...
2
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1answer
2k views

What autopilot to purchase APM 2.6 or PixHawk? [closed]

I'm a newbie in UAV stuff, your advice would be very helpful, i want to start mapping using fixed wing UAV, but my main choice was APM 2.6, but after some researches, i found that APM 2.6 won't be ...