Questions tagged [sensor]
The sensor tag has no usage guidance.
81
questions
1
vote
1answer
69 views
Kalman filter with multiple sensors
I have been reading more about EKF and I am a bit confused on how you handle predictions with multiple sensors.
Ex, I have IMU, GPS, Odom and Stereo Camera.
Each can be used to predict location, how ...
1
vote
0answers
25 views
How to get a depth map from a Kinect 360 depth sensor?
I'm trying to understand how Kinect 360 depth sensor works. At the moment, I know that this sensor is composed by an infrared pattern generator and a infrared camera. IR camera gets the pattern ...
0
votes
0answers
14 views
Accelerometer drift: What hardware-level signal conditioning operations are being performed under the hood of a MEMS accelerometer chip?
I'm in a debate with a peer who says that filtering accelerometer signals at the chip-level has nothing to do with mitigating the problem of drift
Often, additional software-level filtering is ...
3
votes
2answers
70 views
Speed from Depth/Pressure sensors
I have a pressure based Depth sensor. For reference, MS5837-02BA.
All depth measurements I've been able to read are very accurate (±1cm)
I tried experimenting to find out the speed of the body by ...
0
votes
0answers
26 views
Measuring the frequency of the Analog input signal of an ADC, which is operated by Raspberry PI
I'm building a monitoring package for a sensor via a raspberry PI and an ADC, which reads the analog signal (for the moment from a DC power supply instead the real sensor) and transfer it to my ...
1
vote
3answers
144 views
Averaging data from 2 sensors
Suppose we take a reading of a single rotating axis using 2 identical sensors. Intuitively, I think that averaging the outputs of both sensors will yield a less noisy result. But what if sensor A has ...
1
vote
0answers
40 views
Using a Kalman filter to clean acceleration data
I am collecting acceleration, gyroscope and magnetometer data in all 3 directions. I would like to filter noise from the accelerometer using a Kalman filter. I am not trying to esimate orientatoin or ...
3
votes
1answer
43 views
How significant is the time lag between inertial IMU data in a inertial analisys?
I'm working on a MCU system that use an IMU (ICM-20948) which has two different chip inside: one provides accelerometer and gyroscope data at $1125$ Hz (configurable at $125$ Hz), the other one ...
1
vote
1answer
118 views
Finding Minimum SNR or Minimum Detectable Signal Based on Noise Spectral Density
Imagine I have an $n$-bit sensor, whose noise spectral density is $V/\sqrt{Hz}$. $V$ is an exemplary measurement unit. The desired measurement bandwidth is also known. Is there a mathematical way to ...
1
vote
1answer
41 views
Accelerometer Inference from power spectrum
I have 3d accelerometer data sampled as 60hz. When I am looking at the power spectrum in all three accelerations (x,y,z). I am noticing a trend with a negative slope. I trying to figure a few things ...
0
votes
1answer
56 views
What is the driving Voltage?
While I was looking into ultrasonic transducer in order to transmit and receive a beam, I came across specification of a transducer stating driving voltage as 20Vrms. I am not sure what actually does ...
0
votes
0answers
19 views
Equalization of ultrasonic transducer [duplicate]
I am working with ultrasonic transducers with frequencies 100 kHz, one for transmission one for reception. The transmitted signals are chirps. I would like to measure the time of flight between ...
0
votes
1answer
21 views
I want to get tilt sensor value for a given time t_0, but the tilt sensor data points are discrete. How do I interpolate between the discrete points?
I have 3-dimensional readings from a tilt sensor (specifically these are rotational angles about X, Y, and Z axes) over time. Let's call these angles S. I want to infer S at a specific time t_0, but ...
0
votes
0answers
24 views
Extracting time-tagged pulses from Geiger audio recording
I am doing some tests with SmartGeiger detector designed for smartphones. The sensor unit sends pulses via phone microphone jack input and the app does the counting and calculates the values.
However,...
0
votes
3answers
116 views
Is it better to use sampling rates which are a power of 2? 32-64-128-256-512Hz? instead of using for example 30- 60-100-250-500Hz?
I am recently working with a sensor that I its sampling frequency can only be configured to either 32hz- 64hz- 128hz-256hz... and I was wondering whether using such sampling frequencies have any ...
0
votes
1answer
40 views
Estimating Real-Time Vehicle Velocity from low-frequency GPS, accelerometer, gyro and magnetometer in Smartphone
I am trying to write a system that would be able to estimate the velocity of a traveling vehicle (usually a car) using a smartphone. Most smartphones have the next sensors:
1Hz Low-Frequency GPS
10-...
0
votes
0answers
48 views
What does Allan variance really means? [duplicate]
Let a sensor (e.g. accelerometer) with a combination of white gaussian noise and random walk noise.
The loglog plot that is usually shown as function of a time parameter, affine decreasing for a ...
0
votes
1answer
94 views
How to understand the sum of all “fourier frequencies”?
I got the data of an acceleration sensor to analyze. It consists of special terms of 30 Hz, 60 Hz and 120 Hz. In the following you can see in the first plot the 60 Hz data and in the second one the ...
0
votes
2answers
38 views
Can amplitudes be used to differentiate one signal from another?
I have use case, where there are lot of sensors placed under ground.The sensors give amplitudes each second.So my aim is to detect if some anomalous activity takes place at that point.
IF an activity ...
0
votes
2answers
393 views
Fourier transform of a noisy signal
Let's suppose i have a sensor that measures the output of a process and this cause a not negligible noise that affects my signal. My goal is to analyze the process signal in order to find faults. How ...
1
vote
0answers
33 views
SciPy - Distinguish between two group of periodic samples [closed]
First of all, I'm sorry for my bad English writing, plus, I'm new to DSP.
Background
We have got motion data of 20 cows. 10 cows are healthy and 10 cows are slightly lame.
Lameness is an abnormal ...
0
votes
1answer
38 views
How to get discrete values from a nosiy data set that have a trend?
I have a sensor that produces values over time (appr. 50/sec). I visualized these values (X axis is the time), this can be seen on the picture, measurement A and B - these are two independent ...
0
votes
0answers
46 views
pressure decay filtering
So, I've been dealing with a series of pressure decay curves from a pressure transducer. Each one has a waterhammer effect as a consequence of shutting down pumps. Here are examples of 3 curves:
I'm ...
0
votes
1answer
250 views
Getting Vario (m/s) from a bmp180
I am building a variometer as a hobbie, this could be a duplicate from an existing question: How to use Kalman filter for altitude prediction based on barometer data? .
Details follow:
I have a ...
2
votes
1answer
141 views
Reduce noise of sensor by combining two
I've had the basics of signal in university but little real-life practice. I've got an acceleration sensor with a digital output signal (signed 16 bit value). This signal is a little noisy. The ...
0
votes
1answer
96 views
Inverting Sensor Transfer Functions?
When you see software packages that read in data from sensing equipment, does the software do something to inverse the transfer function?
Correct me if I'm wrong in my understanding, but this is how ...
0
votes
1answer
425 views
Kalman Filter - How to combine data from sensors with different measurement rates?
I'm trying to implement a Kalman filter for tracking the position of a vehicle with the help of position data from GPS and Odometry measurements. The GPS data (WGS84 format collected from an app on an ...
0
votes
2answers
852 views
Minimum sample frequency of IMU accelerometer and gyroscope
I was wondering how I would justify a sampling rate of 125 Hz for accelerometer and gyroscope data from wearable sensors. This is a rate used in a lot of biomechanics literature, but I can't seem to ...
1
vote
0answers
67 views
How to draw a smooth spectrum from a discrete array of measurements at selected frequencies?
I have a AS7265x triad spectroscopy sensor from SparkFun (link) which gives me measurements at 18 individual light wavelengths between 410nm and 940nm. The datasheet says that the FWHM of each sensor ...
0
votes
0answers
27 views
Signal ECG , collecte & visualize data
I am currently working on a sensor that visualizes an ECG signal and visualizes its data. Its principle is that it has 3 electrodes that must be placed in specific parts of the body .... I would like ...
5
votes
1answer
1k views
What type of low-pass filter to use for gyroscope filtering in control application?
I am using a gyroscope to generate a feedback signal that drives a motor to resist rotation, just as in a camera gimbal.
The gyroscope is sampling at 32 KHz with a bandwidth of 8 KHz, and my control ...
0
votes
0answers
36 views
Is my Kalman Filter model reasonable? Using for a 3 wheels rover platform
Background: I'm building a 3 omniwheel rover platform that looks something like this:
It has 1 IMU sensors on each of the wheels (3 in total). So in theory, I can get gyroscope and accelerometer data ...
0
votes
1answer
255 views
Bias instability in Gyroscopes : AVER / ADEV
I am attempting to implement allan variance to determine the amount of bias that is shown in my IMU's gyroscope ( BMI160 ). I am doing this with the following formula, that was captured in the ...
4
votes
1answer
1k views
How to interpret Allan Deviation plot for gyroscope?
Regions with different slopes correspond to different types of noises in Allan Deviation plot of a steady gyroscope at steady temperature.
My doubts are:
What is significance of x axis in this plot, ...
1
vote
0answers
79 views
Rocketry : Combine two accelerometers to reduce noise?
I am designing an IMU for an experimental rocket. I'll be using the BN055 9DOF that has sensor fusion - orientation quaternion - and gravity compensation.
My main goal is speed computation, and I was ...
0
votes
1answer
104 views
Handling a number of simultaneous measurements in Extended Kalman Filter?
If I have a number of sensors whose measurements arrive at the same time - how can I handle them properly in the Kalman filter?
P.S.
The measurements are not necessarily taken at the same time but I ...
2
votes
3answers
237 views
Kalman Filter Sensor Processing
Kalman filter achieves convergence of state vector by using sensor observations.
Assuming a sensor such like velocity sensor, giving two axis velocity information in X-axis as well as Y-axis(see edit ...
1
vote
1answer
36 views
Is there a closed form solution for a temporal calibration of two different signals?
Given two signals $f_1(t),f_2(t+dt)$ where $t$ is time and $dt$ is the time delay between the two signals,
is there any closed-form solution with respect to $dt$?
what are the efficient global ...
3
votes
1answer
218 views
FFT of resultant of signals
If one has two signals (say, two acceleromters mounted perpendicularly) and a piece-wise resultant acceleration signal is determined, it appears that frequency content information cannot be determined ...
1
vote
1answer
105 views
Signal recovery from multiple noisy sensors
I'm working on detecting signals buried under the sensor noise using a multiple sensor system and using some technique (correlation?) to take what is common to all the sensors and cancel out the ...
2
votes
0answers
334 views
Software based synchronizing of multiple data streams/sensors with slightly differing sampling rates
Situation:
I try to synchronize the data streams of multiple sensors (ADXL372) of the same type but with different data output rates. The data sheet states all sensors should have the same sampling ...
1
vote
0answers
45 views
Interpretation of steady state sensor signal
I try to understand some measurement results of an accelerometer MEMS sensor. I used a mikrocontroller which is sampling an accelerometer's analog signal with the built in analog-digital-converter. ...
1
vote
0answers
49 views
Source localization in 3d
Let's say I have a 4-sensor square-shaped array in 3d space, with sensors at
$$ s_1 = [1 \ 0 \ 1] \\
s_2 = [2 \ 0 \ 1] \\
s_3 = [1 \ 0 \ 2] \\
s_4 = [2 \ 0 \ 2] \\ $$
And a single source somewhere ...
1
vote
3answers
753 views
Digital filter selection for sensor
I am having a LM35 sensor which gives $10\textrm{ mV}$ signal per degree rise of temperature. Now I have one question, which digital filter will be the best for this ?
This sensor will be use in very ...
0
votes
0answers
82 views
Digital filter: selection
I am going through digital filter design. But I really get confused with so many
Digital filters :
IIR
FIR
Moving Average
Linear phase filter
Allpass filter
Comb filter
Analog filter:
...
4
votes
2answers
240 views
Detecting Pattern from Signal Data by Gaussian Mixture Model?
I'm a machine learning newbie.
I have sensor data which is generated by several sensors.
The data is a series of 'time's. (it is not labeled, in other words, I cannot know which sensor generates ...
0
votes
1answer
6k views
What is sensor drift?
From Wikipedia:
If the output signal slowly changes independent of the measured property, this is defined as drift
So my question is, if I have a gyroscope with sensor drift does that mean that $E\...
1
vote
1answer
1k views
Filtering an acceleration signal
I have a triaxial accelerometer giving me acceleration along x, y, and z. I then combine the 3 axes by calculating magnitude of acceleration over all time points (details in my question here)
I'm ...
2
votes
1answer
2k views
Triaxial accelerometer to single signal
I have some smartphone recorded accelerometer data, so I have acceleration along 3 axes: $$a_{x}, a_{y}, a_{z}$$
The accelerometer data was collected by securing a phone to a walking subject. I'm ...
0
votes
1answer
84 views
Spectrum Sensing HW
I am interested to use an existing hardware to perform a spectrum sensing/monitoring in the frequency range of 2.2–2.6 GHz.
Taking into account that the 802.11ac channels are in the range of 2.4–2.5 ...
