N4HY’s web page
Bob McGwier, N4HY
In my natural state, at the keyboard.
Left to Right: Gerald Youngblood (K5SDR), me (N4HY), Frank Brickle (AB2KT), and Phil Covington (N8VB) at AMSAT 2007 Symposium
The Family says I need a mid-life crisis so I got a Honda S2000 surprise on Christmas.
Please visit my picture site: http://n4hy.smugmug.com
is the most important
formula in signal processing.
My doctoral thesis, on nonlinear filtering, was concerned with dynamical systems of the form:
This is a stochastic differential equation and the last term
is a Gaussian or Brownian motion stochastic process. Nonlinear filtering concerns itself predicting
the probabilistic behavior of the dynamical system when given an incomplete
and/or noisy look at the “signal” 
where the look takes
this form:
Here h is a nonlinear function and again, v is a Gaussian or Brownian motion. This stochastic differential system and its nonlinear observation equation are the theoretical underpinnings for the study of fully nonlinear phase locked loops. In a numerical treatment of the nonlinear phase locked loops contained in my thesis, I was allowed to apply this to the Venus Halley Balloon probe signals. The first few transmissions from the two balloon probes into the Venusian atmosphere were noisy, with high Doppler residual because of the probes penetration deep into the atmosphere of Venus. This was one of the most thrilling things I have ever been involved in.
I have compiled Erlang/OTP5.5.5 for cygwin. You must be running the cygserver (see the cygwin documentation for installation of the service) and run this under cygwin. The otp5_5_5.tbz contains both the executables and the documentation. Install it in /usr/lib/. The source may be downloaded from here http://www.erlang.org .
LASTLY: You spammers have abused my guest book so it is gone.