On 10/5/13 3:57 AM, Magnus Danielson wrote:
On 10/05/2013 01:03 AM, Jim Lux wrote:
On 10/4/13 2:54 PM, Alan Melia wrote:
Jim it may not be helpful but had you thoughtof expanding the
exponential as the first few terms of an infinite series to see if it
simplifies fitting?
I'll try attaching a plot of some sample data.
Oh, I/Q data, in that case recording the state of your tracking loop
helps a lot. Also, the rate of your exponential should be fairly well
known, so you could do a linear least square with that.
It's IQ but not from a tracking loop..
The underlying physics is a turn on transient as it comes to temperature
(with gain/phase variation) superimposed on a longer term linear trend.
And it occurs to me that fitting more polynomial terms (although one can
represent exp(x)+kx with a polynomial) runs the risk of removing the
data (the variations in the I/Q), while constraining the fit to an
exp(-kt) means that the "transient" starts at the beginning.
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