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AWR1642: distance accuracy and PoH

Part Number: AWR1642

Team,

My customer has the following questions: 

1.  what kind of distance accuracy can we get from chirp mode in the 1-5 feet range?  We are looking for near zero altitude performance.  

2. I questioned the near distance performance because there is mention of lower cutoff frequencies in the IF of 150kHz and 350kHz in the datasheet.  What is the lowest 150kHz or 350kHz and can the low cutoff be disabled?

3. Another item of interest on the datasheet was the POH rating of a cumulative 10000 hours.  Is that really what the expected service life is of these parts?  That falls well below most other chips reliability ratings.  Can you add more clarification?

Regards,

Aaron