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Honglei Chen


MathWorks

1.336 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
How to introduce phase error into phased array
You can do somethign like this to simulate a phase error uniformly distributed within +/- 2.5 degrees in each element. pherr_de...

16 dagen ago | 0

Answered
phased array mag2db
Thanks for the suggestion, we will look into this.

16 dagen ago | 0

Answered
How can i fix this problem "Undefined function 'Taylor' for input arguments of type 'double'."
Looks like you are using a function from the book so you may want to find the function from the disc or download. You should als...

17 dagen ago | 0

Answered
Can I design speaker array and measure the distribution of sound field in the Phased Array System Toolbox?
You can build a round array in Phased Array System Toolbox, but I'm not familiar with acoustic vortices. Do you have a reference...

30 dagen ago | 0

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...

ongeveer 2 maanden ago | 1

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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 ...

ongeveer 2 maanden ago | 0

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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...

ongeveer 2 maanden ago | 0

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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...

ongeveer 2 maanden 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...

ongeveer 2 maanden 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...

ongeveer 2 maanden 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...

2 maanden 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

2 maanden ago | 0

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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...

2 maanden 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...

3 maanden 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...

3 maanden 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...

3 maanden 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 ...

3 maanden 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

3 maanden 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...

3 maanden 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 ...

3 maanden 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

3 maanden 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...

3 maanden 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

3 maanden 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

3 maanden ago | 0

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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...

4 maanden ago | 0

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

4 maanden ago | 0

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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...

4 maanden 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...

4 maanden 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...

4 maanden 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...

4 maanden ago | 0

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