Community Profile

# 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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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 Tage ago | 0

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

16 Tage ago | 0

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...

18 Tage ago | 0

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...

etwa ein Monat ago | 0

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...

etwa 2 Monate ago | 1

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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 ...

etwa 2 Monate ago | 0

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...

etwa 2 Monate ago | 0

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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...

etwa 2 Monate ago | 0

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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...

etwa 2 Monate ago | 0

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...

2 Monate ago | 1

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 Monate ago | 0

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 Monate ago | 0

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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 Monate ago | 0

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 Monate ago | 0

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.

3 Monate ago | 0

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 Monate ago | 0

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 Monate ago | 0

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 Monate ago | 0

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 Monate ago | 0

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 Monate ago | 0

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

3 Monate ago | 0

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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 Monate ago | 0

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 Monate ago | 0

How can I load Phased Array System Toolbox to my trial Matlab?

3 Monate ago | 0

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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 Monate ago | 0

Hi Mirza, Thanks for requesting these features, we'll look into it.

4 Monate ago | 0

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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 Monate ago | 0

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 Monate ago | 1

| accepted