Total measurement time in Radar Equation

Seunghoon Kang

Prodigy 130 points

In TI tranning, I have some quetions about radar equation.

Intro to mmWave Sensing : FMCW Radars - Module 4 : Some System Design Topics | TI.com Video

Total meausrement time (called as integration time or active frame time) is N*Tc.

After range-FFT and Doppler-FFT, the processing gain is N*Tc.

Is the processing gain is Tc if range-FFT is only passed ?

The processing gain means the gain obtained after ADC output.

If target is located at far range and ADC input SNR is very low about ~0dB (inability to distinguish between signal and noise), can the target be detected when processing gain is increased by increase of measurement time?

Is it possible to detect a far range target if the total measurement time is increased?

over 2 years ago

0 Cesar over 2 years ago

TI__Guru*** 141184 points

Please give us some time to review your question with systems team

thank you

Cesar

0 Seunghoon Kang over 2 years ago

Prodigy 130 points

Thank you. i will wait your response.

0 Cesar over 2 years ago in reply to Seunghoon Kang

TI__Guru*** 141184 points

Hi,

Here is some input I have received

The FFT operation provides coherent processing gain . If no FFT is applied across the N chirps (i.e. No Doppler-FFT) then the integration time is simply Tc (Active chirp duration)
Yes, In theory by increasing the measurement time you can detect very low SNR targets. To achieve this, the target/object needs to be in the same range-Doppler bin for the duration of the measurement time. In practice, moving objects would cross range-Doppler bins if the measurement time is too large and hence increasing the measurement time would not increase the detection capability for these targets.

Thank you

Cesar

0 Seunghoon Kang over 2 years ago in reply to Cesar

Prodigy 130 points

Thank you for the clear answer.

RF & microwave

RF & microwave forum

Total measurement time in Radar Equation