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Honglei Chen


MathWorks

1,329 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
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...

5 days 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...

5 days 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...

6 days 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...

7 days ago | 0

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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

7 days 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...

8 days ago | 0

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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...

23 days 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...

28 days 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...

28 days 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 ...

1 month 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

1 month 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...

1 month ago | 0

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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 ...

1 month 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 months 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 months 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 months 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 months 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...

2 months ago | 0

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

2 months 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...

2 months 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...

2 months ago | 1

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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...

2 months 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...

2 months 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...

2 months ago | 1

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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 months ago | 0

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

3 months 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

3 months ago | 1

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Answered
phased.URA 8 by 1 array
This is a linear array, you can consider using phased.ULA to model it. phased.URA requires multiple elements in both dimensions....

3 months ago | 0

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Answered
PHASED ARRAY TOOLBOX/ SINUSOIDAL VIBRATING TARGET MODELLING
Nothing off the shelf at this point. This being said, the interface of features in Phased Array System Toolbox are numeric vecto...

4 months ago | 0

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