Honglei Chen

MathWorks

Last seen: 1 day ago | Active since 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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Answered
Pulse Doppler radar system simulation using MATLAB
You will have to be careful about your parameters. You have a pulse width of 5e-4, which means your radar is off during this per...

1 day ago | 0

Answered
Implementing Doppler Shift in FMCW Radar simulation
The Doppler shift is taken care of within the signal propagation, on the line of [xrxIradar,angIradar ]= step(channelIradar, x...

1 day ago | 0

Answered
Smearing in Range-Doppler plots
These are the sidelobes of the FFT. I don't think this is due to the range-Doppler coupling. You can consider windowing to reduc...

1 day ago | 0

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How do I generate micro Doppler data and graph (stft) from the given data?
You could consider reference the following example Introduction to Micro-Doppler Effects - MATLAB & Simulink The example cover...

1 day ago | 0

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Dwell and Switch PRI sequence of a radar signal
There are several examples related to this in MATLAB. The following example talks about PRF staggering itself Waveforms with St...

1 day ago | 0

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Phase spoiling for beam broadening
The following example provides an introduction to beam spoiling, those codes can be used with phased array objects. These are ce...

1 day ago | 0

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Beamforming algorithms with null steering
This can be achieved using the nullweights function in Phased Array System Toolbox. You can refer to the following example which...

1 day ago | 0

Answered
Phased Array Simulation script
Here is a script to reproduce the animation %% Parameters fc = 300e6; c = 3e8; lambda = c / fc; d = lambda / 2; %% Create ...

10 days ago | 0

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Sonar range and speed/doppler output using phased.RangeDopplerResponse with match filtering
Hi Joe, phased.RangeDopplerResponse uses muliple pulses to estimate the speed, so the maximum unambiguous speed it can measur...

7 months ago | 0

Answered
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...

2 years ago | 0

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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...

2 years ago | 0

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

2 years ago | 0

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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...

2 years ago | 0

Answered
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...

2 years ago | 0

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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 ...

2 years ago | 0

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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...

2 years ago | 0

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Answered
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...

3 years ago | 2

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Answered
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...

3 years ago | 0

Answered
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...

5 years ago | 0

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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...

6 years ago | 0

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Answered
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 ...

6 years ago | 0

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Answered
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...

6 years ago | 1

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Answered
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...

6 years ago | 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...

6 years ago | 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...

6 years ago | 0

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Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 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 ...

6 years ago | 0

Answered
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...

6 years ago | 0

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Answered
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...

6 years ago | 0

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