tobin

% State-Space Simple Harmonic Oscillator
%
% This script simulates a damped simple harmonic oscillator (i.e. mass on a
% spring) using a state-space description, and also implements a linear
% observer.
%
% Tobin Fricke
% 2012-04-13

% Parameters

tobin

Show the effect of ADC/DAC quantization noise.

tobin

# FILTERS FOR ONLINE SYSTEM
#
# Computer generated file: DO NOT EDIT
#
# MODULES FeCoeff32x
#
# SAMPLING RATE 65536
#
################################################################################
### FeCoeff32x                                                               ###

tobin

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

/*
  Custom atan2 function calling the FPU directly, for use when the
  math library isn't available.

  Tobin Fricke <[email protected]> 2012-03-13
  

tobin

How to calculate an exponential running average.

tobin

Analysis of the twin-T notch filter

tobin

function y = applysos(soscoef, x)
% Apply a matrix of SOS cofficients to some time series.
%
% Tobin Fricke
% 2012-02-07

if size(soscoef,2) ~= 6
  error('soscoef is not the right size');
end

tobin

# Description: AAFILTERNEW
# File: AAFilterNew
# Revision: 2011-10-25

r r6 5.11k nin na1
r r7 5.11k na1 nb1
c c12 2.2n nb1 gnd 
c c16 6.8n na1 nout1
op n4a lt1124 nb1 nout1 nout1

tobin

% Here's an attempt to sketch the filter toplogy:
%
% in      R1A       C1            R2A       C2
% >----+--/\/\/\----||---+--+--+--/\/\/\----||---+---+----> out
%      |                 |  |  |                 |   |
%      +------/\/\/\-----+  |  +------/\/\/\-----+   |
%             R1B           |         R2B            |
%                           +--|-\                   |
%                              |  \__________________|
%             R_BIAS           |  /

tobin

Download from my GPS from these two trips.  Part of the first leg of the airplane trip
is missing.

For a quick visualization, extract the coordinates:
> grep '^T' trackOct2011.txt | awk '{print $5 " " $4}' > foo.txt

Then you can open up gnuplot and simply do:
> plot "foo.txt"