AWR1642: the relation between the azimuth and signal intensity

Hello Rata,

Looks like you tried to attach some pic. Not able to see the pic. Can you try and attach it again?

-Raghu

Hi Raghu,

  If there are two objects at different angles(one is 0°，the other is 30 °) with the same range in the following:

Is the signal intensity that the radar receives from the two objects  identical?My understanding is that the object with higher azimuth has weaker signal intensity, is that right?

Regards,

Rata

Hi Anil,
As you said "the object at 30 degrees (in the horizontal plane) would have a 3dB drop in antenna gain, and consequently a 3 dB decrease in SNR (or signal intensity)",then does the configration of dataPathObj->SNRThresholds int the TIDEP-0092 demo depend on the angle? That is to say，if there are two objects at different angles(one is 0°，the other is 30 °) with the same range from the radar, the SNRThreshold value at angle 30 degrees will be half of the object that is at angle 0 degree.

Hi,

In theory, yes, the received signal strength would fall by about 3 dB. (Note that the 'SNR Threshold' is in (scaled) dB, not in linear scale)

In practice, though, the RCS of a real target (like a car), varies significantly based on its type and orientation. Changes in received signal strength is likely to be dominated by changes in the RCS, and not by azimuth position.

Regards

Anil

Hi Anil,
Thanks for your reply, but I still have some questions as below:
1.In the SRR demo, the CFAR thresholds are varied as a function of range in the following：
obj->SNRThresholds[0].rangelim = (uint16_t) (6.0f * (float)(1U << obj->xyzOutputQFormat));
obj->SNRThresholds[0].threshold = convertSNRdBtoThreshold(1, 15.0f, CFARTHRESHOLD_N_BIT_FRAC);

obj->SNRThresholds[1].rangelim = (uint16_t) (10.0f * (float)(1U << obj->xyzOutputQFormat));
obj->SNRThresholds[1].threshold = convertSNRdBtoThreshold(1U, 13.0f, CFARTHRESHOLD_N_BIT_FRAC);

obj->SNRThresholds[2].rangelim = 65535;
obj->SNRThresholds[2].threshold = convertSNRdBtoThreshold(1U, 12.0f, CFARTHRESHOLD_N_BIT_FRAC);
What is the theory the configration of the SNR values in dB 15.0f,13.0f,12.0f ?
2.In the above configration, the range selections are 6.0m and 10.0m, if I want to configrate the range as 20m,30m, 50m, 70m, 80m, how to choose the SNR values?Whether it makes sense to do that.
3. The peakVal thresholds are varied as a function of range (meant to remove cases of clutter being detected too when we drive the car.) Thresholds were derived from experiments.
obj->peakValThresholds[0].rangelim = (uint16_t) (3.0f * (float) (1U << obj->xyzOutputQFormat));
obj->peakValThresholds[0].threshold = (35000 >> obj->log2numVirtAnt);

obj->peakValThresholds[1].rangelim = 65535;
obj->peakValThresholds[1].threshold = 0;

obj->peakValThresholds[2].rangelim = 65535;
obj->peakValThresholds[2].threshold = 0;
The peakVal thresholds only satisfy the situation of the range less than 3m, if the range is more than 3m,how to choose the peakVal thresholds? Does that make sense?

Regards,
Rata

Hi,

We apologize that no answer was provided for some time.

Please let us know an answer is still required for these questions or if you were able to answer them based on the code

thank you

Cesar

Hi Cesar,

Yes, I still require the answer,can anybody give some support?

Thanks in advanced,

Regards

Rata