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Questions tagged [sonar]

SONAR stands for SOund Navigation And Ranging, it is a technique that uses sound waves to detect objects or to navigate.

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Convert sonar scans to Lidar scan file

Has anyone tried to map environments using Sonars or 1D ToF sensors? Since it's very difficult to implement such an algorithm from the scratch, I'm planning to use an existing ROS packages such as ...
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3answers
2k views

What's the difference between a sonar and ultrasonic sensor?

After having read the introductions of the Wikipedia articles about "sonar" and "ultrasonic sensor", it is still not clear to me what the differences between the two are. In the context of robotics, ...
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1answer
44 views

Appropriate distance sensing technology for specified conditions [closed]

I have been considering different distance sensing technologies for the following circumstance: Range needs to be about 2.5 meters The surface being measured is a wall that is painted black The ...
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0answers
104 views

Matlab: Simulate received signals of sonar sensors

StackExchange community! I need the guidance what to use for the generation sensor data in Matlab. My purpose is to optimize the exploration process of unknown environment using the multi-robot ...
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1answer
912 views

Quadcopter PID Tuning for Altitude Hold/Position Hold along Z axis

Good day, I have just finished tuning the Pitch and Roll PID's. I did this by setting the throttle such that the quad is weightless. I did the tuning of each axes separately. I would just like to ask ...
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1answer
138 views

Ultrasonic Sensor's Lag (20Hz) effect on PID contol loop rate (150Hz)

Good day, I would like to ask how is it possible to use an ultrasonic sensor for altitude hold in a quadcopter if the sampling rate of the Ultrasonic sensor (HC-SR04) is only 20Hz before incurring any ...
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2answers
105 views

Dynamically detect changing obstacles

So the idea is that there would be one robot acting as overwatch, which would detect all of the obstacles in an area (which are not necessarily static), and then send the data about the obstacles' ...
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3answers
140 views

Tracking Landspeed Underwater

I am hoping someone might be able to nudge me in the right direction (apologies for the long post but wanted to get all the information I have gained so far down. Basically I am after a solution to ...
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3answers
1k views

SLAM without landmarks using sonar [duplicate]

I'm currently programming an app for a robot and I'd like to make him map a zone and then make him move autonomously from one point to another. I have to solve a SLAM problem, but the biggest matter ...
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7answers
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What are some low cost alternatives for lidar? [closed]

It need not be as effective as lidar or it may have some disadvantages when compared with lidar. What are the probable alternatives? Edit: I'm intending to use it outdoors for navigation of ...
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1answer
5k views

How do ultrasonic range finders detect objects at an angle?

As far as I can tell, an ultrasonic rangefinder works by reflecting inaudible soundwaves off of objects and timing their return. But if the object has a flat surface and is angled with respect to the ...
8
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1answer
408 views

Monte-Carlo Localization

I'm implementing Monte-Carlo localization for my robot that is given a map of the enviroment and its starting location and orientation. Mine approach is as follows: Uniformly create 500 particles ...
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1answer
202 views

Image retrieval through a multibeam imaging sonar

I would like to know if anyone here has used the Blueview SDK (Linux) for retrieval of images from the pings obtained by a multibeam sonar (P450, P900, etc.) ? If so, I'd like to know why would anyone ...
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2answers
238 views

Usage of Multibeam 2D Imaging Sonar for AUVs, testing them in the pool environment

I belong to an AUV team at my university. We are planning to have a Multibeam 2D Imaging Sonar (the Blueview P900) for our AUV to detect obstacles underwater. I have the following questions to ask on ...
8
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1answer
1k views

How can I manipulate real-time sonar data from my Arducopter in Arduino?

I have a APM 3DR Quad with a 3DR radio telemetry kit. I would like to send real-time sonar data to my laptop (running Windows 7) in order to manipulate it in an additional Arduino Sketch. The ...
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3answers
2k views

How to deal with sonar crosstalk

Our robot has a circular array of 12 sonar sensors that looks like this: The sonar sensors themselves are pretty good. We use a low-pass filter to deal with noise, and the readings seem pretty ...