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# Honglei Chen

### MathWorks

1,303 total contributions since 2011

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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

8 days ago | 1

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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....

8 days ago | 0

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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...

18 days ago | 0

How can i use global2localcoord function with axes?
From what you describe, your x axis is [1 1 0] and your y axis is [-1 1 0]. When yo specify the axes matrix, each colum represen...

19 days ago | 0

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How can I use the constantGammaClutter function to generate the clutter with no ULA
You can set the Sensor property to something like phased.IsotropicAntennaElement and it will generate clutter accordingly. HTH

19 days ago | 0

How to add zero infront of number
I don't think you can pad zero for a numeric number but you can do it when printing. For example fprintf('num = %02d\n',2) Is ...

22 days ago | 0

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How can I use a matrix to be a loop variable
If you have somethign like mat = {mat1,mat2,mat3,mat4} You can do for m = 1:numel(mat) imshow(mat{m}) end HTH

22 days ago | 0

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sine wave shifted 90 degree
If it's really just a sine wave, you can consider hook it up with a integrator. HTH

24 days ago | 0

How to determine the rotation matrix for rotating one vector to align with another ?
There is no special meaning of rotvv other than it's one of the implementation to rotate one vector to be parallel to another on...

25 days ago | 0

Replace two-way propagation channel with two one-way propagation channels
This may have to do with your target location. The channel delays signal based on the distance. However, when the travel time is...

25 days ago | 0

XCORR function to find the lag time between two signals
We probably need a bit more info to understand why the lag is always the same. But by default xcorr returns the delay in lags, t...

1 month ago | 0

Error with the "Design an Internally Matched Ultra-wideband Vivaldi Antenna" example
You will need to open the example in MATLAB. In there you should have a button labled as "Open Example" or something close. When...

1 month ago | 1

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the element in radarObjects mean in Forward Collision Warning Using Sensor Fusion
The radarObject output is a detection, therefore it contains the information from the detected signal. If you have data from the...

2 months ago | 0

Frost beamformer internal calculations
Yes, the code is available to see if you do edit phased.FrostBeamformer The constraint is simply to return a distortion less ...

2 months ago | 2

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simulating RWR in R2016a
If you open the example in MATLAB and click "Open Example" button, all files assoicated with the example will appear in the temp...

2 months ago | 0

Possible to obtain ultra wide band monostatic radar model?

2 months ago | 1

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Why would you say taht at least one antenna should not receive the signal? You are using isotropic element in the array so every...

2 months ago | 0

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phased.RangeDopplerResponse axis scaling
The input of RangeDopplerResponse is a matrix reprsents fast time and pulses. Therefore, if you have a TDM MIMO radar, you can e...

2 months ago | 0

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Have you looked at the following example? Would that be at the level you are interested? https://www.mathworks.com/help/phased/...

2 months ago | 0

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constantGammaClutter function usage?
These are high level steps but they look ok. I don't quite understand the last step though. What do you mean by "output of the c...

2 months ago | 0

Replicated.subarrays with taper
If you want to apply taper on the entire aperture, it might be easier to use the phased.PartitionedArray interface. You can then...

2 months ago | 0

The sequence to call beamforming and receiver ?
In Phased Array System Toolbox, receiver models thermal noise at the receiving elements so beamformer should happen afterwards. ...

2 months ago | 0

I want to learn the phased array antenna with Matlab

3 months ago | 0

Linear 45 degrees polarized antenna element
In R2018b, there is no easy way to specify a 45-degree short dipole. The easier way to achieve that is probably combine the fiel...

3 months ago | 0

[Phased Array Toolbox] Modelling an unmodulated continuous wave radar
A radar system is probably modulated. Since the modeling is done in baseband, for a single frequency continuous wave, that will ...

3 months ago | 0

Do I need a receiver channel when I using ULA?
The receiver also models the thermal noise in the receiver. If you need to include that effect, then you should not skip the rec...

3 months ago | 0

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How to use Signal Analyzer App inside of a script
Signal analyzer is capable of generating MATLAB script so you can run the script to accomplish what you did in the app. Maybe th...

3 months ago | 0

Plot RangeAngleResponse of ACC Example
It looks like you are using the first part of your code to generate xr and then the second part to do range-angle processing? If...

3 months ago | 0