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# Doppler radar accuracy - RF Cafe Forums

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Jorrie
 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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