CCS/MMWAVE-SDK: Need help in understanding angle FFT

user5197472

Part Number: MMWAVE-SDK

Tool/software: Code Composer Studio

Hi there,

From the TI training and the mmw Demo introduction, I learned that the angle FFT gives the azimuth result. However, there is no detail in how to do this azimuth FFT(angle FFT). Could you please explain a little bit in the method? Is it a Digital beam forming (DBF) process in order to find the coherence peak?

By the way, may I know the reason why the two transmit antennas Tx1 and Tx3 are horizontally spaced at d = 2 Lambda? It seems not intuitive to make it an integer, right?

Thanks in advance for you answer.

Best,

Zhu

over 7 years ago

0 Akash Gondalia over 7 years ago

TI__Guru 50240 points

Hello Zhu,

This is discussed in the Doxygen which can be found in the latest version (1.1) of the mmWave SDK. It is located at C:/ti/mmwave_sdk_01_01_00_02/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

The angle FFT is discussed in the section called "Data Path - Direction of Arrival FFT Calculation."

Cheers,
Akash

0 user5197472 over 7 years ago in reply to Akash Gondalia

Prodigy 130 points

Hi Akash,

Thanks for your apply. However I believe those few words in that paragraph are far from enough. Again I wish to know is angle FFT actually doingg a Digital beam forming (DBF) process?

Also I wish to know what does the peakVal in the detObj2D mean? What does it stand for?

Best,
Zhu

0 Akash Gondalia over 7 years ago in reply to user5197472

TI__Guru 50240 points

Hi Zhu,

I can confirm no beam forming is being performed here.

PeakVal is a relative value representing returned signal strength. Is there a specific document you are looking at that is talking about peakVal?

Cheers,
Akash

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CCS/MMWAVE-SDK: Need help in understanding angle FFT