AWR2243: Question about the code of TXBF example in mmwave studio 3.00.00.14

Chris Meng

Part Number: AWR2243

Hi,

In \mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\4chip_cascade_TxBF_example\PostProc\BeamSteerPhaseCalc.m, you can find below code.

slope(t,:)= wrapTo360(sin(b_ang(t)*2*pi*d/180)*D_TX*180);，

I also found below info in comment.

b_ang: steering angles

d = 0.5*centerFrequency/TI_Cascade_Antenna_DesignFreq;

D_TX: TX antenna array position in the unit of half lamda

When d=0.5, the sin(b_ang(t)*2*pi*d/180)*D_TX*180 is same as the formula below.

When centerFrequency is not same as TI_Cascade_Antenna_DesignFreq, I know there should be some adjust to get more correct phase shifter value. But why to multiply the 2*d to the theta (b_ang(t))? Is there any theory for this? Any doc to refer to ?

Thanks,

Chris

over 4 years ago

0 Cesar over 4 years ago

TI__Guru*** 148444 points

Please give us some time to check with systems team and get back to you

thank you

cesar

0 Cesar over 4 years ago in reply to Cesar

TI__Guru*** 148444 points

Thank you for your patience,

Please see following

This slide is part of the mmWave Fundamentals Training Module 5 Angle Estimation

Introduction to mmWave radar sensing: FMCW radars | TI.com Training Series

Thank you

Cesar

0 Chris Meng over 4 years ago in reply to Cesar

TI__Mastermind 37726 points

Cesar,

Thanks for your reply.

What customer is not clear is the 2*d used in the matlab code sin(b_ang(t)*2*pi*d/180). They want to know the theory of this. Would you pls help to check again?

d = 0.5*centerFrequency/TI_Cascade_Antenna_DesignFreq;

Best Regards,

Chris

0 Cesar over 4 years ago in reply to Chris Meng

TI__Guru*** 148444 points

Please give me a few days to check

thank you

Cesar

0 Cesar over 4 years ago in reply to Cesar

TI__Guru*** 148444 points

Hi,

the 2 comes from 2 PI and the d is the distance between antennae

thank you

cesar

0 Chris Meng over 4 years ago in reply to Cesar

TI__Mastermind 37726 points

Cesar,

Based on the comment in the code, d = 0.5*centerFrequency/TI_Cascade_Antenna_DesignFreq;.

It seems the code adds some correction when there is gap between centerFrequency of config and the antenna design frequency. Would you pls kindly explain the theory of this correction？

0 Cesar over 4 years ago in reply to Chris Meng

TI__Guru*** 148444 points

Center frequency is usually used when we define the lambda related distance between the antennae

thank you
Cesar

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AWR2243: Question about the code of TXBF example in mmwave studio 3.00.00.14