CCS/AWR1843: Rx Antenna physical separation

Hi

Let me double check the code and get back to you in a few days.

Thank you

Cesar

Hi Cesar,
My question is: if I want to develop a proprietary board with different antenna separations (Tx_n, Rx_n, where the assumed distances are in the algorithms so I could modify them.

Thanks

Claudio

HI,

Please give me a few days to review this with the systems team

thank you

Cesar

Hi Cesar,

Any news about my question?

Thanks,

Claudio

Sorry for the delay

Here is some information. The MRR demo is based on an early version of the mmwave SDK demo. Information below is taken from the SDK demo information

It is just at end of the chain, when we calculate the angle. Instead of hard coded ratio between d and lambda,(d being distance between the antennas) d/Lambda = 1/2. The actual value should be used.

So we need to replace:

Wz=pi*sin(phi) with  Wz=2*pi*d/lambda*sin(phi) and

Wx=pi*sin(theta)*cos(phi), with Wx=2*pi*d/lambda*sin(theta)*cos(phi)

This is referred in AOA , see in yellow below. So the equations should be appropriately corrected for x,y,z calculation.

Hi Cesar,

In my "mrr_18xx_dss project", browsing "dss_data_path.c" file:

"void MmwDemo_interFrameProcessing(....)" calls "uint32_t aziEleProcessing(....)" and it call one of the functions below, that I suppose I should modify for my own Rx antenna separation.

While the variables Wx and Wz are over there, the equations for their calculation differs from the one you sent me.

void MmwDemo_XYcalc (.....)

{

..............................................

   Wx = 2 * sMaxIdxFlt *obj->invNumAngleBins;
   x = range * Wx;

.............................................

}

void MmwDemo_XYZcalc (.....)

{

..............................................

   Wx = 2 * sMaxIdxFlt *obj->invNumAngleBins;
   x = range * Wx;

  Wz = (float) atan2sp(tempIm, tempRe) * (1.0f/PI_) ;

.............................................

}

Thanks,

Claudio

Hi Claudio,

The MRR demo was originally based on SRR demo, which was based on an early version of the SDK.

Here is what I have found in the SDK 1.05 documentation

C:\ti\mmwave_sdk_01_00_00_05\packages\ti\demo\xwr16xx\mmw\docs\doxygen\html

Does this help?

If not I would have to check with original developer if available

thank you

Cesar

It looks like the other graphs were added in the documentation for the following SDK release

C:/ti/mmwave_sdk_01_01_00_02/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

Hi Cesar, 

Theory is fine, but if you can check with original developer (if available), where in the code this parameter is applied,  pointing to a specific function or a set of them, it will help me more.

Thanks,

Claudio

Thank you

Let me check with developer and get back to you

Cesar

Hi,

Please see updated code

Thank you

Cesar