# Questions tagged [position]

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### Find the position of a short music track in a longer track

I have a long music track (2 hours) which consists of many smaller tracks (1 min each in avg). How to programmatically or using a service to determine the time position of a particular small track in ...
• 121
267 views

### Getting position data from 9-axis IMU

I want to track the movement of a person in a 2D plane using a 9-axis IMU. The size of the plane in which the movement is not bigger than 6 by 6 meter. The IMU is mounted on the head of the person and ...
48 views

### UWB Indoor Positioning

I am trying to understand the UWB technology and how it can be used for localization. Are there any resources where I can study about the algorithms it uses to calculate the direction? Also why does ...
• 43
41 views

### A-GPS frequency (fd) search ranges

A-GPS is able to reduce the fd search range from several kHz (GPS search range) to several hundred Hz (a-GPS search range). I know the GPS search range has a center at 0 Hz. What is the center ...
• 13
1 vote
201 views

### GPS timing and computational complexity

I have been using Garmin GPS device for years. Just curious which algorithm is used in the device: Navigation equations that can calculate both GPS device's position and its clock bias. In this way, ...
• 13
40 views

### how to get the location long and lat out of the raw measurements?

I'am making a research about GNSS I used GNSS logger to collect measurements but couldn't understand how these measurements turn into location of long and lat? the picture below of the measurements ...
208 views

### How to compute position by FFT?

I have FFT data of x, y, z - axis, Now I'm trying to find the position through FFT data. Step 1 : For that, applied corresponds to an ordinary frequency i.e rad·s−1, ...
455 views

### Kalman Filter Parameter Definition for Vehicle Position Estimation in Python

I'm relatively new to Kalman filter concepts and I would like to use it for estimating and tracking the accuracy of the position of a vehicle with GPS measurements (As a first step). However, I am not ...
• 53
1 vote
77 views

### Optimal sensor placement for 3D TDoA positioning

Suppose there is a rectangle indoor area, we want to locate different positions within this area using TDoA estimations. 5 sensors are placed to obtain optimal 3D positions with TDoA errors, we only ...
• 59
474 views

### How to triangulate 2 sources on a 2d plane formed by 4 sensors?

I have 4 sensors capturing signal data. Signal distribution speed is constant and known. I have sensors positions in 3d space. Also, I have an amplitude/frequency decomposition for data received by ...
• 51
100 views

### Rollercoaster: determining subject position from inertial data?

I have inertial data (accelerometer, gyroscope, magnetometer) from phones of human subjects riding a single rollercoaster repeatedly. The ride has temporal variance (ex. sometimes getting from A to B ...
• 123
3k views

### Kalman Filter for estimating position with nonconstant velocity & acceleration

I am trying to estimate the position & head direction of a rodent going through a 2D environment (a circular surface of 1m radius). Above his head is an overhead camera which records 4 LEDs ...
2k views

### Slow Data rate of GPS data

GPS satellites send 50 BPS of info apart from 1 MBPS PRN. What is the basis for choosing 50 BPS. Why can it not be 100 or 1500? The reason I am asking this is Almanac download time is 12.5 mins which ...
• 103
1 vote
121 views

### Sensor Data Fusion with Orientation Sensors in 3D Euclidian Space

Preconditions For measuring the position of a mobile device in 3D space, I utilize two sensors with different characteristics that measure device orientation. Sensor A (a combined sensor of ...
• 226
1 vote
466 views

### One of the best ways to numerically integrate a signal?

I need to get position $x$ (integration) from velocity $v$. One could use 1st order Euler integration as $x_{t+1} = x_t + \Delta v_t$ However, doing so leads to errors proportional to sampling time ...
• 111
918 views

### Is step detection the correct approach to this problem? what if not?

I'm looking for some advice on where and what to start reading for learning to solve this. I've the time series of the position coordinates (x,y) of an animal in an open field (just a cage). I want ...
• 123
618 views

### Tracking 2D positioning with IMU Sensor

I am using a miniature car and I want to estimate the position. We can not use GPS modules and most of the tracking systems that I saw, are using IMU sensor with the GPS module. In our car we are able ...
• 121
339 views

### obtain the position of an object in an image [closed]

I would like to compare the positions of the same object in 2 different pictures and get the difference between the positions in in terms of x and y coordinates.Suppose I have a picture with a square ...