# Honglei Chen

### MathWorks

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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**Feeds**

How to optimize the antenna weight of a two-dimensional array to generate null in a specific direction

Your script is pretty close, you just need to set up the desired response properly. However, you could take advantage of the pat...

5 månader ago | 0

how get the range from FFT on FMCW radar data

You may want to look at the following example, especially the "Range and Doppler Estimation" section. It shows how to extract th...

5 månader ago | 0

phased array antenna simulation

You can set the ArrayAxis in phased.ULA to 'x' to achieve that. Hope this helps

6 månader ago | 0

How to modify the response of a antenna element with respect to different opearting frequency in the specified frequency range?

As Manikanta mentioned in the comment, you can set up a phased.CustomAntennaElement to specify a pattern that is not constant ac...

6 månader ago | 0

Ti 6843 mmWave sensor - How can I get micro-Doppler?

TI6843 itself does not have capability to output raw data. It only outputs the processed data. Therefore, as is you cannot deriv...

6 månader ago | 0

Relationship of array factor and directivity for an antenna array

I agree with your array factor definition but I don't quite follow your reasoning on normalization. I don't think there should ...

7 månader ago | 0

Anyone has TOPS model in WideBand Signal DOA?

There is no off the shelf TOPS algorithm implementation in MathWorks offering, but there are tools in Phased Array System Toolbo...

7 månader ago | 0

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What is the difference between Signal Processing Toolbox and DSP System Toolbox R2023a?

While Signal Processing Toolbox supports performing signal processing and analysis (resampling, power spectrum estimation, visua...

ungefär ett år ago | 2

| accepted

Getting steered beam gain in Phased Array Toolbox

Hi Peter, Happy new year! The pattern() computation does take into consideration of beam broadening. However, uniform linear ar...

nästan 2 år ago | 0

Trouble in codegen customized antenna pattern

I don't know how x is formed, but here is an example you can take a look, that generates the code. The main idea is to push patt...

mer än 3 år ago | 0

Adding Tapering and Time Delay

Unfortuantely at this point there is no straightforward way to combine the element taper with time steering. At this point, I th...

mer än 4 år ago | 0

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Antenna Pattern plot Phase

Looks like you are using Phased Array System Toolbox and it currently doesn't support 'phase' as a type. We will try to address ...

mer än 4 år ago | 0

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Wideband LOS channel block - propagate to multiple destinations

Could you share how you invoked the block? My guess is your signal is a single column vector while the block is expecting a matr...

mer än 4 år ago | 1

| accepted

What is the maths behind findpeaks function on matlab?

There is no specific name for the algorithm. Essentially it looks for points that is larger than the two adjacent points. Is the...

mer än 4 år ago | 0

Phased Array Toolbox Directivity Calculation

It would be helpful if you could share which textbook theory you are referring too. Directivity is often used interchangeablly w...

mer än 4 år ago | 0

Internal error in phased array toolbox applications.

This bug has been fixed in R2019b Update 2. If you get any update later than that, it should work properly. For more details, yo...

mer än 4 år ago | 0

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epsilon-neighborhood for polar coordinates

I'll explain how clusterDBSCAN works in this situation. In your case, range and angle will be two features so you can specify e...

mer än 4 år ago | 0

Backscatter Bycicle/Pedestrian Sampling Frequency

It seems that you are tring to simulate the radar echo. In that case, I don't think you can lift that constraint. In real applic...

mer än 4 år ago | 0

FMCW 24 GHz automotive Radar mmWaves simulation (Target Range&Speed Detection)

You can just randomly generate some range and speeds based on a trajectory. For example, phased.Platform can help generate some ...

mer än 4 år ago | 0

Angle Doppler response using FFT

I notice that you are using 128th range gate for plotting. Are you sure you have the correct target there? You can try to verif...

mer än 4 år ago | 0

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Electronic steering of clutter using phased.constantgamma clutter model

This is a good enhancement request, unfortunatly at this point the electronic scanning is not supported. We'll see if we can add...

mer än 4 år ago | 0

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Can I use phased.BackscatterPedestrian and phased.FMCWWaveform to simulate wideband echo, like fc=77GHz, BW=4GHz?

There is nothing prevents you to set the bandwidth to 4GHz. The only thing you need to be cautious is that with such a bandwidth...

mer än 4 år ago | 0

Phased Array System Toolbox: DOA with MVDREstimator using output data after Range-Doppler FFTs

To perform DOA estimation, the data input has to be across number of channels, i.e., number of elements in the array. On the oth...

mer än 4 år ago | 0

Simulation of range ambiguous clutter in phased array toolbox

phased.ConstantGammaClutter simulates clutter up to the horizon range. So it already builds the range ambuity in. HTH

mer än 4 år ago | 0

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Undefined function 'helperPolarizationView' for input arguments of type 'double'.

This is a helper function for the example, so you need to open that example from MATLAB. This will copy the supporting files int...

mer än 4 år ago | 0

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Can phased.GSCBeamformer system Object run Frame by frame?

Those beamformers do main states but currently there isn't a way to export those states. Essentially, when you first run it usin...

mer än 4 år ago | 0

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What's the algorithm of the phased.rangeangle response

It depends on the system. In summary, if you use an FMCW waveform, you want to use FFT to do range processing. If you use a puls...

mer än 4 år ago | 0

Is ifft(fft(x).*fft(h)) faster or conv(x,h) ?

Time is not the best way to compare the two approaches. Rather, the best approach to describe is the computation complexity, i.e...

mer än 4 år ago | 0

The value returned from getNumInputsImpl method must be a constant value. But the Value is immutable

You said numInputs is nontunable, did you try to use Nontunable in the property defintion? Like properties (Nontunable) nu...

mer än 4 år ago | 0

Simulating Freespace power in Matlab

You can start with these reference pages https://www.mathworks.com/help/phased/signal-propagation.html? Go to Functions -> Sig...

mer än 4 år ago | 0