Range Profile for zero Doppler

Hiroyuki Kanematu

Does the Relative Power (dB) on the vertical axis of the Range Profile for zero Doppler of mmWave Demo visualizer represent the ratio of transmit power to receive power?

over 5 years ago

0 zigang Yang over 5 years ago

TI__Mastermind 45765 points

Hi, there:

No, this is the received power. It is called relative power because it is not in dBm. The value itself is not very meaningful after all the scaling in the process. But you can see the power difference between different range bins.

Best,

Zigang

0 Hiroyuki Kanematu over 5 years ago in reply to zigang Yang

Expert 2975 points

Hi, Zigang

Thank you for your reply. I would like to ask one question, what is the ratio of the received power to the relative power? What does range bin stand for?

Hiroyuki

0 zigang Yang over 5 years ago in reply to Hiroyuki Kanematu

TI__Mastermind 45765 points

HI, Hiroyuki:

The received power at the input of LNA has to go through all the RF/IF gains on the receive side, ADC sampled and then go through all the post processing scaling. I do not have an exact number for this ratio (scaling).

The rangeBin is the index for range FFT output, the range is calculated from range bin by range = rangeIndex * rangeResolution.

Best,

Zigang

0 Hiroyuki Kanematu over 5 years ago in reply to zigang Yang

Expert 2975 points

Thank you for answering your question.

After all, you don't know where and how much power is relative to the received power and what its value is.

Also, I have another question.
What is a range index?

Hiroyuki

0 zigang Yang over 5 years ago in reply to Hiroyuki Kanematu

TI__Mastermind 45765 points

The index of your range FFT output is called range index (it is the FFT index). Range is calculated as range(rangeIndex) = rangeIndex * rangeResolution.

Best,

Zigang

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Range Profile for zero Doppler