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Honglei Chen


MathWorks

1.309 total contributions since 2011

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Answered
Relationship between noise power in a Band-Limited White Noise block VS Variance in a Random Number block
You may want to look at the Algorithm section of the following doc page https://www.mathworks.com/help/simulink/slref/bandlimit...

ongeveer 18 uur ago | 0

Answered
Beamforming with FFT not showing Grating Lobes
This is because when you use FFT, by definition FFT covers only between 0 to 2pi. But when you have an element spacing of severa...

1 dag ago | 0

Answered
Problem in the initFcn callback of model
When you say that you rewrote the init function, did you overwrite it? If so, it should use the same one. You can certainly rena...

1 dag ago | 0

Answered
IMU sensor fusion viewer "HelperOrientationViewer"
You may have to open the example in MATLAB and click the "Open Example" button. That will copy all necessary helper functions in...

4 dagen ago | 1

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Answered
Variable measurement length for trackingEKF
Could you elaborate what kind of system you are trying to model? In general the dimension of the measurement doens't change over...

9 dagen ago | 0

Answered
delay and sum beamforming
Have you tried phased.PhaseShiftBeamformer? That would perform delay and sum beamforming for you. HTH

22 dagen ago | 0

Answered
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

ongeveer een maand ago | 1

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Answered
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....

ongeveer een maand ago | 0

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Answered
what does this error error mean? "Array formation and parentheses-style indexing with objects of class 'phased.PhaseShiftBeamformer' is not allowed. Use objects of class 'phased.PhaseShiftBeamformer' only as scalars or use a cell array."
Let's say you have two objects bf1 = phased.PhaseShiftBeamformer; bf2 = phased.PhaseShiftBeamformer; The message indicates th...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

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Answered
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

ongeveer 2 maanden ago | 0

Answered
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 ...

ongeveer 2 maanden ago | 0

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Answered
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

ongeveer 2 maanden ago | 0

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

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

2 maanden ago | 1

| accepted

Answered
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...

3 maanden ago | 0

Answered
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 ...

3 maanden ago | 2

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Answered
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...

3 maanden ago | 0

Answered
Possible to obtain ultra wide band monostatic radar model?
There is a wideband radar example at https://www.mathworks.com/help/phased/examples/modeling-a-wideband-monostatic-radar-in-a-m...

3 maanden ago | 1

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

3 maanden ago | 0

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Answered
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...

3 maanden ago | 0

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Answered
How to simulate automotive radar?
Have you looked at the following example? Would that be at the level you are interested? https://www.mathworks.com/help/phased/...

3 maanden ago | 0

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Answered
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...

3 maanden ago | 0

Answered
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...

3 maanden ago | 0

Answered
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. ...

3 maanden ago | 0

Answered
I want to learn the phased array antenna with Matlab
I would start with the following page https://www.mathworks.com/academia/student_version.html HTH

4 maanden ago | 0

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