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Questions tagged [sonar]

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How a fish sonar is built and signals from sensors processed?

How a fish sonar is built and signals from sensors processed ? There are $50 fish wireless sonars on the market. I would to buy one but need to know how it works, what is a number of sensors and if ...
darius's user avatar
  • 1
3 votes
1 answer
216 views

Crash course on Sonar

I have some experience in Signal processing and a lot more in solving numerically the electromagnetic field integral equations using Matlab and C++. Now I am curious about the Sonar (e.g., underwater) ...
jomegaA's user avatar
  • 659
2 votes
1 answer
375 views

Object Detection using audible sonar

I am currently working on a project of identifying the position and angle of the objects in an environment using sonar (audible) about 1 to 2 m away from a desktop speaker within an angular sector of ...
Gamme40's user avatar
  • 21
0 votes
1 answer
65 views

Is there any modern information about a 12-hour periodicity in sonar noise?

I have a copy of Principles of underwater sound by Urick, 3rd edition. In the chapter on The noise background of the sea: ambient noise level, on pages 215/216, it says "The analysis of data in ...
Dan Pollard's user avatar
0 votes
0 answers
36 views

How can i identify number of return of the ping in the sonar?

I am writing a fake function which is actually doing active pinging (basically SONAR). I am little confuse here about how to identify the number of sonar return i got ? Let's say i am continuously ...
Jay Patel's user avatar
  • 158
1 vote
0 answers
48 views

What is the best technique for underwater imaging?

I am currently researching what the best method to take underwater images/video is. The papers I have read go into several different methods: Lidar, Synthetic Aperture Sonar (SAS), optical camera plus ...
Jake's user avatar
  • 336
1 vote
2 answers
524 views

Doppler Shift and the Pulse Repetition Interval

Suppose that I have a signal $x(t)$ consisting of $N$ pulses at a given frequency $\omega_{c}$. I space them $T$ seconds apart, ie the Pulse Repetition Interval (PRI) for the waveform is $T$. Now ...
The Dude's user avatar
  • 632
0 votes
0 answers
235 views

How to remove echo/reflected-sound caused by stationary objects when building a ultrasound based radar

I am emitting ultrasound with a speaker and am trying to track moving objects with a microphone array by detecting doppler shifts. I have succeeded to detect movement. However, to detect the direction ...
Deep Mind 's user avatar
-1 votes
1 answer
122 views

Scan shallow water

I need to scan a shower tray with & without the water running to assess the puddling at the drain, then export a point cloud or surface. Sonar & Laser dont seem to be able to deliver, can ...
R. Knight's user avatar
2 votes
1 answer
98 views

How to extract a signal received from a given angle by two microphones

Please bear with me, as I'm only a programmer, and have no knowledge of signal processing as a discipline. I have an application which generates a short pulse of 12 kHz frequency sound from a single ...
user3660664's user avatar
1 vote
0 answers
216 views

Interpretation of minimum discernible signal (MDS) in sonar equation

I am working on modelling and simulations of synthetic aperture sonar at component/subsystem level. I have started with standard sonar equations for calculating detection ranges for different ...
naumankalia's user avatar
1 vote
0 answers
323 views

Use of USRP SDR to process sonar?

I have ordered a USRP kit to do radio signal processing in software. Is there a way to use the same device to process sonar data? What would I do upconvert the sonar to 50 MHz?
Tyler Durden's user avatar
1 vote
1 answer
149 views

Echo detection for localization

I was reading about active sonar and couldn't quite understand how the echos are recognized. My doubt is, when the sound signal is reflected back, it is greatly attenuated and distorted due to many ...
BaluRaman's user avatar
  • 689
10 votes
1 answer
1k views

How do I implement an adaptive thresholding algorithm for underwater sonar

I want to implement an adaptive thresholding algorithm in MATLAB for filtering data received by an underwater sonar receiver. The data received has an interactive noise component resulting from ...
Saurabh's user avatar
  • 101