IWR1443: mmWave Radar Sensors: Object Versus Range

Hi,

user6356280 said:

1. This is true for all graphs, but why is the reception strength of about 60 dB occurring even in locations where there is no target object?

This scale is relative, so that 60 dB is not really meaningful. It just means 60 dB above an arbitrary noise floor.

user6356280 said:

2. This is true for all graphs, but why is there a peak around 0-10m?

This may be due to near-field effects, antenna coupling, or reflections from the ground.

Best,

Nate

user6356280 said:

・60 dB higher than the noise floor, but both the noise and range profiles on the graph appear to indicate about 60 dB. What exactly do you mean by 60 dB higher than the noise floor?

There is a minimum signal strength that corresponds to the LSB of the ADC in the signal chain of the radar. All this graph is saying is that the noise power measured is 60 dB above that LSB. When viewing this plot, I would recommend looking at the difference between the peak value and the noise floor, which appear to be about 80 dB and 60 dB respectively, for an SNR of 20 dB (which is quite a lot!).

user6356280 said:

・What exactly does the noise profile indicate? Is it the received intensity during the time the transmitting antenna is not transmitting?

See documentation here.

Hi,

You can add more chirps to increase the SNR, or decrease your sampling rate. When you decrease your sampling rate, you reduce the noise bandwidth. See the SNR equation here for some inspiration.

https://www.ll.mit.edu/sites/default/files/outreach/doc/2018-07/lecture%202.pdf

Best,

Nate