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Doppler radar accuracy - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Doppler radar accuracy
Posted: Sun Jun 25, 2006 9:30 am 
 
Captain

Joined: Tue Jun 13, 2006 4:22 am
Posts: 10
Location: 25.9S 28.1E
If speeds in space one day get up to a significant fraction of the speed of light, the relativistic Doppler radar solution becomes:

(Delta lambda)/lambda = (1+v/c)/(1-v/c) - 1, which reduces to ~2v/c if v is very much smaller than c and v is an 'opening velocity'.

Will someone please tell me the velocity accuracy of good present day Doppler radars? I would like to work out how fast relative velocities in space must become before the error of the radar equals the error of the low-speed approximation (2v/c).







Posted  11/12/2012

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