AWR1243: How to implement coherent integration in AWR1243 device?

user6223132

Part Number: AWR1243
Other Parts Discussed in Thread: AWR1642

How to implement coherent integration in AWR1243 device?

Vivek mentioned the following message.

"Hello ,

Lets take an example. The thermal noise is -174dBm/Hz . If we take a noise figure of 14dB the noise level on the receiver is -160 dBm/hz.

If you have a 512 samples per chirp and 5Mhz IF bandwidth , the bin size of each FFT bin is 5Mhz/512 = 9.765Khz. So the noise level per FFT bin in a chirp is = -160+10log10(9765) = -120 dBm.

If you do coherent integration across 512 chirps in a frame that gives you a noise reduction of 27 dB (10log512). So across a frame the noise level is -120-27 = -147dbm.

If you set a detection SNR of 15dB then you can detect an object at -122dBm input level.

Regards,

Vivek

Thanks in advance.

over 4 years ago

0 Anil Mani over 4 years ago

TI__Expert 4720 points

Coherent integration for FMCW radars are done using FFTs (range FFT and doppler FFT). These would need an external processor like the TDA (if you are using AWR1243) or an integrated DSP like the AWR1642.

Regards

Anil

0 user6223132 over 4 years ago in reply to Anil Mani

Prodigy 60 points

Hi,Anil:

Thans for your relpy.I do want to know how to implement it. I think that coherent integration is based on coherent sampling.However, coherent sampling requires expensive instruments, such as high performance signal generators and frequency synthesizers. Once coherent sampling is not satisfied, spectral leakage will occur in ADC spectrum.

0 user6223132 over 4 years ago in reply to Anil Mani

Prodigy 60 points

Can you do me a favor to answer the question.Thanks in advance.

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AWR1243: How to implement coherent integration in AWR1243 device?