Questions tagged [localization]

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What are the differences between L2C, L5, L1C in GPS systems for civil use? [closed]

I am trying to better understand the functioning of the GPS data transmission, in the civil field, of three of these three different categories: L2C L5 L1C One of the main goals of the GPS ...
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What are the differences between GPS and GLONASS?

I'm studying the localization systems, especially the GPS one. I inquired about other systems and wanted to understand what are the main differences between GPS and GLONASS, why has the first type ...
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What difference AoA algorithm between 4x4 URA and 12 elements square shaped?

I'm reading a paper from Lund University. They show the measurement and compare the accuracy of 3 types of arrays. The interest and question I got are two types, 4x4 URA and 12 elements square-shaped. ...
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2 votes
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Advantages of Chan's method over the Kalman filter

For a 3-receiver tracking system. Chan's positioning method gives an exact solution to the location problem. However in the literature, I saw that one could use the extended Kalman filter which is ...
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Combining position estimates to enhance user localization

I have several estimated positions for an object. These positions come from several sensors. I would like to know if it is possible to combine these different positions into a single position. If yes ...
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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 ...
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1 answer
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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 ...
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-1 votes
1 answer
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localization with TDOA under Doppler shift

In a localization system, I use the TDOA (Time Difference of arrival) method. The transmitter is moving at a speed v and its communication signal is received on 3 receivers at different times. For a ...
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Multiple Transmitter Localization - Channel Modelling

I read in this paper about to localize multiple transmitter in a wireless scenario. I know from other source that this hypothesis is completely false. What do you think? Is there in the literature ...
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Doing ICA analysis on MEG data with 248 channels

I am trying to localize sources of brain activity using MEG data. I first want to compute ICA and then localize independent components of interest. However, I sometimes have trouble making a decision ...
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1 vote
1 answer
764 views

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 ...
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1 answer
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sound source localization - calculation of sound intensity vector angles

I'm working on an acoustic source separation problem where I want to separate the voices of a choir based on intensity vector statistics. I'm currently implementing a paper by Günel called “Acoustic ...
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Frequency specific GCC-PHAT

Background Python GCC-PHAT works for me really well in a quiet environment. However, in a noisy environment, the results are no good. I want to locate a source of the sound of a known frequency range ...
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Are there standards/references for determining spatial scale in photographic images?

EDIT, 12/12/20: Images below are of the radial sinusoid pattern. Left side is the "unrotated" version. Right side is what the a photograph of the pattern would look like if the disc was ...
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Finding time of arrival of signal using GNU radio

I am sending a repeating BPSK modulated PN sequence signal from a USRP x310 transmitter. I am receiving the sequence with another USRP x310. Both are attached to an octoclock. Is there a way to get ...
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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 ...
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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: ...
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Is it possible to detect or localize movement of objects using LPWA (or LPWAN) such as LoRa, DASH7, NB-FI?

Assume that there is a moving human in the room without any device (or receiver). Is it possible to detect or localize movement of objects using LPWA (or LPWAN) such as LoRa, DASH7, NB-FI by analyzing ...
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Looking for WiFi Phase and RSSI data

I'm not sure if this is right platform to post . I am researching on WiFi Localization algorithms using Machine learning and was wondering if anyone knows any dataset which is publicly available. ...
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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 (...
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Phase difference measurement of a signal sampled with two different sampling frequencies

I am working on phase interferometry for locating a transmitter. The direction of arrival of an incident wave can be estimated from the phase difference caused by the antenna separation as shown ...
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2 votes
1 answer
393 views

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) ...
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1 answer
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Particle filter localization with different types of measures

I want to implement a localization system using particle filter or other bayesian filter. I have a motion model based on odometry and different types of sensors for measurement. During the navigation, ...
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Cone of Confusion

In sound perception, humans adapt by tilting the head or relying on other location cues such as visual input when the source of the sound lies on the cone of confusion. On this cone, no time and level ...
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1 answer
143 views

Range Estimation Based on Distance Differences

It is a range estimation problem, as shown in the figure. The blue circles are the anchor node' positions, which are produced by one moving anchor (the moving direction is shown with black arrow). ...
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Cramér-Rao lower bound

I have been trying to implement the Cramér-Rao lower bound from the paper - A reference-free time difference of arrival source localization using a passive sensor array (eq. 6 and eq. 7). $$ \...
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2 votes
1 answer
2k views

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 ...
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What are the most robust implementations of passive/self-localization assuming high noise and reverberation?

I am doing research on a related subject that requires the use of TDOA estimation of two signals in an environment with a great deal of noise and reverberation. If anyone had any expertise on (or ...
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1 vote
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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 ...
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2 votes
2 answers
551 views

DOA - 1D Music Algorithm

I am currently working on a MUSIC algorithm for DOA of RF emitters in 3D. At the first stage, interested to apply the 1D MUSIC using a linear array of 4 antennas, and estimate only the azimuth of the ...
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3 votes
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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 ...
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1 vote
1 answer
216 views

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 ...
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2 votes
1 answer
152 views

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_{...
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1 vote
2 answers
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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: <...
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1 vote
1 answer
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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 ...
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1 vote
2 answers
784 views

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 ...
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1 vote
0 answers
249 views

How to convert magnetometer readings into orientation?

I have a magnetometer sensor, obtaining the reading with $50$Hz rate. Unfortunately, the data is not labeled: I just know that these are $x$,$y$,$z$ axes, and that the reading are in $\mu$T (micro ...
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Object localization down to the pixel

I am somewhat confused on the terminology used in Computer Vision. Suppose I wanted to detect (localize) an object (say, a human) in an image. However, a box around the human is not sufficient, what I ...
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0 votes
1 answer
699 views

Cross-Correlation Signal Delay Estimation Variance

I am working on a project which intends to use Time Difference of Arrival (TDoA) for localization. Firstly, my understanding is that a matched filter is the most common method for estimating signal-...
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