Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [localization]

35 questions
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Multilateration of Sound in 3D Space

TL:DR - How can you find the 3D coordinates of a emitter than transmits an impulse signal? STORY: I'm working on something to improve my bird-watching. I've got a camera that can take pictures of the birds when I'm not around, but currently it has…
David Robie
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Source Localization with the BLUE Estimator

I'm trying to implement BLUE estimator in MATLAB for source localization and after my research I've come up with a theoretical example in Steven Kay's "Fundamentals of Statistical Signal Processing: Estimation Theory" book (Example 6.3). In this…
sfw monster
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GCC-PHAT for Multiple Sound Sources

Can GCC-PHAT be used to detect multiple time-delays (that is, having multiple acoustic sources simultaneously)? The documentation for the gccphat(sig,refsig) function says that it assumes both sig and refsig came from a single source. If it is the…
user262213
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Sound Source Location

I have four microphones which I want to use to locate the direction of an audio source. Is there any Python module that implements an algorithm that, given the recordings of the four microphones, will give me a vector pointing to/angles of the audio…
Samuel
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Line based Extended Kalman Filter for localization : Measurement Jacobian

I have to estimate location w.r.t a given map of the environment. The state is expressed as $ X = \begin{bmatrix} x \\ y \\ \theta \end{bmatrix}$ Given , $ X_{t-1} = \begin{bmatrix} x_{t-1} \\ y_{t-1} \\ \theta_{t-1} \end{bmatrix}$ and it's…
shubham sharma
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Localization by Time Difference of Arrival (TDOA) with Chan's Method

In the paper Hyperbolic Position Location Estimation in the Multipath Propagation Environment (Direct PDF link) at page 2, the Chan's method is presented. But, the presentation is made for a 3 base station system. My question: How to use Chan's…
user60835
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Apple watch measures indoor swim distance despite drift and noise in accelerometer and gyroscope

From my experience and work, I know that getting distance estimates just from accelerometer and gyroscope is an extremely difficult task, especially when you are swimming. I have also seen that even though an apple watch asks you to set pool length…
Pranav Prakash
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Understanding GCC-PHAT as a Feature

I'm working on a sound source localization project and am interested in using GCC-PHAT as a feature. I'm quite new to this transformation and I've been reading a few papers about it and I'm still struggling with understanding what it actually is.…
user25758
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How to Use Time Difference of Arrival (TDOA) for a Transmitter Localization

Does anybody know a source that illustrates the algorithm to use TDOA method to locate a transmitter? Would the equations to solve (x, y, z) of the transmitter location linear or non-linear? How about the iterative algorithm to locate a transmitter…
Cindy
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How accurate is a MPU9250 IMU for direction and velocity measurement?

Pardon the intrusion I've posted this on the Raspberry Pi stack, but I wonder if I might find an answer here more quickly. I'm currently experimenting with a MPU9250 Inertial Measurement Unit (gyroscope, magnetometer & accelerometer) mounted on a…
Nick
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Subtracting audio signal emitted - trying to use spectral subtraction to localize moving objects

I am a Software Engineer without much signal processing background and currently spending and experimenting to get use to it. My scenario: Assume a speaker and a microphone array. A speaker emits an ultrasonic sound and the microphone records at the…
Deep Mind
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sound source localization - finding source vector

This may sound a stupid question - but I am working on some simple microphone array beamforming sound source localization stuff. I think I understand how to use beamforming to find the TOA of the sound source between 2 microphones (positioned, say…
CN railfan
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Delay-and-sum beamforming: implementing steering in C

I am currently trying to understand how delay-and-sum beamforming works. I have found this website which explains the process of this technique very well in which the following C code is provided: #include #include #define…
dll
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Audio localization accuracy with two microphones

I am attempting to find the location of sound using two microphones, using cross-correlation methods. I am not getting very consistent and accurate results, there are instances where there seem to be some kind of noise signals that interfere with…
Samyukta Ramnath
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Understanding the constraint on distance between microphones in microphone array for Direction of Arrival estimation

The distance between microphones in a two-microphone array for direction of arrival estimation, should be at least less than half of the wavelength of the signal that is being detected by the microphone, when the signal is periodic. I am having…
Samyukta Ramnath
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