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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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mfurman
 Post subject: Doppler Damage
Posted: Sun Nov 05, 2006 5:00 am 
 
Lieutenant

Joined: Mon Sep 12, 2005 4:02 pm

Posts: 4

Location: Washington DC

[color=blue]Hi,

I'm wonderning if I could get some reference material or email on the SNR loss with respect to Doppler losses and, if possible its effect w/r to modulation schemes. Mostly interested in X-to-V band with M-ary FSK, but PSK schemes, QPSK, CDMA would also be of interest.

Also would like to know timing delays for typical doppler compensation rate loops (ie how fast can ompensation loops track back to the reference signal? How many cycles are necessary to determine proper compensation? Is there an upper slew rate that is normally set for max doppler compensation in terms like (delta F/F) ? etc.)

Regards,

Michael.j.furman@mdnt.com


Posted  11/12/2012

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