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Honglei Chen


MathWorks

1 332 total contributions since 2011

I am a developer on Phased Array System Toolbox at MathWorks

DISCLAIMER: Any advice or opinions posted here are my own, and in no way reflect that of MathWorks.

Professional Interests: Signal Processing, Array Processing, Radar, and Communication

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Answered
Get Directivity Values From phased.URA
If you want directivity values for all angles, you can just simply do D = pattern(sar_array, F(1), 'PropagationSpeed', PS, 'Typ...

14 jours ago | 1

| accepted

Answered
Spectrum cannot be calculated
From the figure, it seems to suggest that your data is complex but your block is set to compute one sided spectrum. I think you ...

22 jours ago | 0

Answered
Trouble understanding "Lags" for Cross Correlation
1 lag is essentially 1 sample, so how much time it represents depends on your sample rate. In your case, since for 10 sec data y...

22 jours ago | 0

Answered
Multistatic radar simulation in Phased Array Toolbox
Yes Phased Array System Toolbox can model such scene. You can see a bistatic polarimetric radar example at https://www.mathwork...

28 jours ago | 0

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Answered
Simulation of Clutter Affected by Transmitting Weight
Thanks for the post, this is indeed a gap in the toolbox. We'll try to provide this capability in the future. What release are y...

28 jours ago | 0

Answered
Inverse Direction of Arrival Estimation
If you are sure that Range-Azimuth is obtained via a 1-D FFT, then you can just do an inverse FFT, as long as you have the origi...

28 jours ago | 1

Answered
Phased Array Systems Toolbox
X is probably not a matrix. If you can provide more info regarding the data matrix, that will help us understand the problem bet...

29 jours ago | 0

Answered
Max value of each vector in a 3D hyperspectral data matrix
Let's say xc is your datacube, does [z_max,z_ind] = max(xc,[],3) satisfy your needs? HTH

29 jours ago | 0

| accepted

Answered
Using System Objects in complex programs (DSP)
Yes you can do it, there are many shipping System objects that do this. This is essentially done the same as a regular class. H...

environ un mois ago | 0

Answered
Difference between no steering and steervec in 0, 0 ?
Could you share how you invoke the two interfaces? From what you described? The two interfaces is a bit different in array defin...

environ 2 mois ago | 0

Answered
Hi. I have to create an FMCW signal, transmit, receive and mix them to get the IF signal, and inturn get the radar 2D matrix for post processing. But I my 2nd FFT doesnt give the correct value of velocity.
The following example might be helpful to you https://www.mathworks.com/help/phased/examples/automotive-adaptive-cruise-contro...

environ 2 mois ago | 0

Answered
Is there any code for spatial spectrum in ESPRIT algorithm?
ESPRIT does not estimate the direction of arrival from spatial spectrum, thus the function currently does not generate the spati...

environ 2 mois ago | 0

Answered
Is there an alternative for kalman filter
For a linear system, a linear Kalman filter is probably enough. There is also a simpler form of Kalman filter called alpha-beta ...

environ 2 mois ago | 0

Answered
Are there any matlab functions to calculate E,H-plane beamwidths for a rectangular phased array?
You can use polarpattern to plot the pattern in the two planes and measure the beamwidth. HTH

environ 2 mois ago | 0

Answered
Beamsteering With Custom Elements Without Phased Array Toolbox
What you described to me looks like what you will be able to achieve with SteeringVector, or more precisely ArrayResponse. You m...

2 mois ago | 0

Answered
Getting the complex antenna response in the antenna library?
Is this what you mean? https://www.mathworks.com/help/antenna/ref/ehfields.html Or alternatively, if you want it to be in far ...

2 mois ago | 0

Answered
How to update patternCustom plots
Since magE is CData, you can just do h = patternCustom(magE,theta,phi); h.CData = newMagE; HTH

2 mois ago | 0

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Answered
Periodogram of sinusoid: why power is -6 dB instead of -3 dB?
The periodogram shows the power density. The magnitude at those frequency for a sinusoid is 1/2, so the power is 1/4, which corr...

2 mois ago | 0

Answered
How can I know the period of a FMCW?
You may be able to use phased.LinearFMWaveform to achieve this. FMCW waveform is set to be without the idle time. HTH

2 mois ago | 0

Answered
How can I load Phased Array System Toolbox to my trial Matlab?
There is a trial software link on the product home page. https://www.mathworks.com/products/phased-array.html HTH

2 mois ago | 0

| accepted

Answered
Angle of Arrival for UCA
You may want to take a look at root MUSIC algorithm provided in Phased Array System Toolbox https://www.mathworks.com/help/phas...

3 mois ago | 0

Answered
Adaptive beamforming using LMS
Hi Mirza, Thanks for requesting these features, we'll look into it.

3 mois ago | 0

| accepted

Answered
scale factor for constantGammaClutter model in phase array toolbox
The magnitude is determined by many factos, like the power and the value of gamma parameter. In addition, if your altitude is hi...

3 mois ago | 0

Answered
Relationship between noise power in a Band-Limited White Noise block VS Variance in a Random Number block
You may want to look at the Algorithm section of the following doc page https://www.mathworks.com/help/simulink/slref/bandlimit...

3 mois ago | 1

| accepted

Answered
Beamforming with FFT not showing Grating Lobes
This is because when you use FFT, by definition FFT covers only between 0 to 2pi. But when you have an element spacing of severa...

3 mois ago | 0

Answered
Problem in the initFcn callback of model
When you say that you rewrote the init function, did you overwrite it? If so, it should use the same one. You can certainly rena...

3 mois ago | 0

Answered
IMU sensor fusion viewer "HelperOrientationViewer"
You may have to open the example in MATLAB and click the "Open Example" button. That will copy all necessary helper functions in...

3 mois ago | 1

| accepted

Answered
Variable measurement length for trackingEKF
Could you elaborate what kind of system you are trying to model? In general the dimension of the measurement doens't change over...

3 mois ago | 0

Answered
delay and sum beamforming
Have you tried phased.PhaseShiftBeamformer? That would perform delay and sum beamforming for you. HTH

4 mois ago | 0

Answered
Radar simulation: How to apply a precise delay?
The FreeSpace in Phased Array System Toolbox uses fractional delay fitler to approximate the delay between samples. HTH

4 mois ago | 1

| accepted

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