[teqc] decimating data w/ sampling rates > 2 Hz

Lou Estey lou at unavco.org
Thu Mar 3 10:03:13 MST 2005


Yesterday I noticed that the current development code for
teqc would not correctly decimate data with original sampling
rates greater than 2 Hz, e.g. decimation of data with sample
intervals of 0.5 sec would work correctly, but decimation of
data with sample intervals of 0.2 s or 0.1 s would not.

I'm not sure how far back in the teqc releases this problem
goes.  Anyway, I have a fix for the problem which has been
tested on 1-, 2-, 5-, and 10-Hz data.  If anyone needs an executable
to decimate data at rates > 2 Hz, please let me know.

Also, I was wondering if anyone has any data sampled at rates
greater than 10 Hz.  (E.g. the JNS100 can sample L1 at 100 Hz.)
If you could send me one or two seconds worth of data (something
teqc can read or RINEX), I'd like to test the fixed decimation
algorithm at rates greater than 10 Hz.

(The reason this gets tricky is having a decimation algorithm that
also deals with millisecond resets -- e.g. time tags in unsteered
receiver time -- and data at rates < 1 Hz not sampled on the
integer second.)

cheers,
--lou

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Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
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