Hi,

I am trying to collect baseband ap data from X2M200 using python 2.7. I currently have two X2M200 sensors. One X2M200 is streaming out 52 bins data, but the other one is streaming out only 26 bins data. I have double checked the 'num_bins' in baseband_ap_data. One is showing 52 and the other is showing 26. Is there a way to change 'num_bins' in baseband_ap_data? Thanks.

 

Hi Aksel,

I tried to change the detection zone range using set_detection_zone() function in Python. However, it does not change the number of bins. Below is raw data I have printed from these two sensors. You can see that these two X2M200 sensors also have different carrier_frequency and range_offset. The only difference between these two X2M200 is, one is running the original firmware and the other is running the recovered firmware per https://www.xethru.com/community/threads/x2m200-firmware-upgrade-issue.452/

num_bins 52
bin_length 0.0379774682224
sample_frequency 39497105408.0
carrier_frequency 7336198656.0
range_offset 0.300000011921
num_bins 26
bin_length 0.037683416158
sample_frequency 39805308928.0
carrier_frequency 7190491136.0
range_offset 0.40000000596

 

Hi Yunze,
Please check if the same profile (sleep or respiration) is set on both X2M200 sensors. These profiles have different radar frame length for the same range setting.

B.R

 

Hi B.R,

You are right. It is the profile issue. Sleep profile will set 52 bins and respiration profile will set 26 bins. However, it seems that set_detection_zone() function does not change anything.

 

Hi Yunze,
That is how Novelda X4M200 algorithms works. If you want custom respiration and sleep profiles with different number of bins, you need X4M03 development kit to be able to develop your own sensor from scratch.
Note : You are able to modify detection zone, but you will still have different number of bins according to the selected profile (respiration or sleep).

B.R

 

Hi B.R,

Thanks for the explanation. Then, what does modifying detection zone really change?

 

Hi Yunze,
Modifying detection zone will change the detection zone (boundaries) settings of your radar module accordingly.

Best regards.