Community Profile

# Honglei Chen

### MathWorks

Last seen: 3 mois il y a Actif depuis 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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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...

environ un mois il y a | 2

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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...

9 mois il y a | 0

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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...

plus de 2 ans il y a | 0

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

plus de 3 ans il y a | 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 ...

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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...

plus de 3 ans il y a | 1

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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...

plus de 3 ans il y a | 0

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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...

plus de 3 ans il y a | 0

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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...

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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...

plus de 3 ans il y a | 0

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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...

plus de 3 ans il y a | 0

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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 ...

plus de 3 ans il y a | 0

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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...

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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...

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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...

plus de 3 ans il y a | 0

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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...

plus de 3 ans il y a | 0

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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

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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...

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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...

plus de 3 ans il y a | 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...

plus de 3 ans il y a | 0

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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...

plus de 3 ans il y a | 0

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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...

plus de 3 ans il y a | 0

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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...

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MUSIC algorithm ghost target in Matlab Radar Simulation Demo
The range angle image you mentioned in question is not a mirrored target, rather it's just an aliasing to the opposite side due ...

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You may want to take a look at this example to get some idea on how to process real time data. https://www.mathworks.com/help/p...

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Matlab range and angle
I didn't quite understand what you mean by position = d.*t but rangeangle() support vectorization so you should be able to pa...

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MUSIC algorithm for direction of arrival
Generally speaking MUSIC belongs to subspace method. It doesn't really compare amplitude or phase, instead it takes advantage of...

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Radar Doppler Signals for Car dataset!!
What is your requirement? Do you have any specific motion you want to cover? For a generic model, you can consider using many po...

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Collector for array formed of replicated subararrays
They do consider the gain at different angles. As to the input, you may want to check with your setting in array. Did you turn ...

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matlab which filtfilt function handles filter objects
The filtfilt that handles a filter object will be a method on the filter object. For example, you can find filtfilt() method in ...

plus de 3 ans il y a | 1

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