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Honglei Chen

MathWorks

Last seen: 6 Tage vor Aktiv seit 2011

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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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Beantwortet
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 ...

8 Tage vor | 0

Beantwortet
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...

14 Tage vor | 0

Beantwortet
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...

8 Monate vor | 2

| akzeptiert

Beantwortet
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...

mehr als ein Jahr vor | 0

Beantwortet
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...

fast 3 Jahre vor | 0

Beantwortet
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...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
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 ...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

fast 4 Jahre vor | 1

| akzeptiert

Beantwortet
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...

fast 4 Jahre vor | 0

Beantwortet
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...

fast 4 Jahre vor | 0

Beantwortet
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...

fast 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

fast 4 Jahre vor | 0

Beantwortet
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...

fast 4 Jahre vor | 0

Beantwortet
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 ...

fast 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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 ...

etwa 4 Jahre vor | 0

Beantwortet
About real time data processing in FMCW RADAR.
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

Beantwortet
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...

etwa 4 Jahre vor | 0

| akzeptiert

Beantwortet
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...

etwa 4 Jahre vor | 0

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