Lecture Notes

LEC # TOPICS NOTES, SUPPORTING FILES AND LINKS
1 Overview of the aims of the class (PDF)

Class introduction and content

2 Coordinate and time systems (PDF) Introduction to coordinate system definition and realization concentrating on geometric definitions
SCO Web: Control Networks
National Geodetic Survey
3 Potential fields and coordinate systems (PDF) Potential fields and coordinate systems. We also used some Matlab scripts in this lecture. The two programs are Harmonics.m (M), which plots low order harmonics and Sectorials.m (M), which plots high order sectorial harmonics. Surface harmonic figure and code: SurfaceHarmonic.fig (FIG) and SurfaceHarmonic.m (M)
Legendre Polynomial
4 Coordinate types (PDF - 1.7MB) Coordinate systems, rotation of the Earth, Geoid, Spherical trigonometry
International Earth Rotation and Reference Systems Service
Modeling of Nutation-Precession: Very long baseline interferometry results (PDF)
Computation of Geoid99 Geoid Height
Spherical Trigonometry
5 GPS satellite orbits (PDF) GPS satellite orbits. The MATLAB program to compute eccentic and true anomalies is truea.m (M)
The GPS interface control document (PDF)
Unclassified (PDF - 1.3MB)
6 GPS observables (PDF) Start analysis of GPS observables in form of carrier phase
7 Specifics of GPS signal (PDF) GPS codes on signals
8 Pseudorange measurements (PDF) Pseudorange and phase measurements. The data file displayed in class is etab.plt.dat (DAT)
TEQC—The Toolkit for GPS/GLONASS/Galileo/SBAS Data
RINEX: The Receiver Independent Exchange Format Version 2 (TXT)
9 Range and phase data (PDF - 1.3MB) The data files displayed in class are ASCII tab delimited files: etab.02tab (TXT) etab.07tab (TXT) etab.11tab (TXT) etab.26tab (TXT) etab.28tab (TXT)
The following files are based on 2008 homework: data from base station with approximate XYZ coordinates
-2197259.2644 -4811601.7696 3552341.4441 (m)
Each file has a header line with column titles. All range and phase units are meters except as noted where range differences have been converted to L1 cycles
base.02 (TXT) base.04 (TXT) base.05 (TXT) base.09 (TXT) base.12 (TXT) base.17 (TXT) base.28 (TXT) base.29 (TXT)
The site coordinates are in the rinex header shown in Lec #8
Sources of GPS data (main archives)
SOPAC
CDDIS
NGS/CORS
UNAVCO
10 Estimation: introduction (PDF) Start estimation looking a parametric estimation methods
Data Analysis for Process Modeling
Least Squares Parameter Estimation (Regression Analysis)

histograms.m (M) generates histogram plots

11 Statistical approach to estimation (PDF) Continue estimation now examining it from a statistical point of view
12 Estimation: correlations (PDF) Statistical description of process noise in parameter values. The MATLAB program fogm.m (M) generates first-order Gauss Markov processes. (Note since the random number generator is not initialized, your results will differ from those in the class notes (Signal processing tool box is needed for the PSD calculation). FlickerNoise.m (M) implements flckernoise model through PSD->Covarinace Matrix->eigenvectors and values
13 Estimation (PDF) Kalman filter approach to estimation
14 Propagation medium: propagation Timing in GPS. Examine clock estimation
IGS Clock Products Working Group
IGS Time Scale
15 Propagation medium: neutral atmosphere (PDF) Tropospheric delay estimation
The Height of the Tropopause
Effects of the Troposheric Mapping Function on Space Geodetic Data (PDF - 1.0MB)
Index of /DELAY
16 Propagation: ionospheric delay (PDF - 1MB) Ionospheric delays
National Geophysical Data Center
Data file (Year Month Day SunSpot number)
RIDAILY (1811-2012/04)
17 Basic antenna operation Antennas and calibrations
NGS/Antenna Calibrations
Absolute PCV of AOAD/M_T Choke Ring GPS Antenna
18 Mathematical models in GPS (PDF) Class starts development of mathematical models needed for precise GPS positioning. In this class we look at solid-Earth tides, ocean-tidal loading and other types of loading effects. The following Fortran source code was discussed in the lecture earth_tide.f (F) and gst_jd.f (F)
19 GPS models and processing Models: Rank deficiencies, ambiguity resolution and differencing methods
20 Processing software (PDF) Processing software:
GAMIT/GLOBK Web Tutorial
21 GPS groups/IGS (PDF)

GPS data availability and site locations
UNAVCO
International GNSS Service
International GNSS Service—All world map (PNG)

22 Kinematic GPS (PDF) Kinematic GPS processing and results from experiment earlier in semester
Help File for GAMIT Track Program
Results from MIT survey
track_LC.out (TXT)
track.NEU.rovr.LC (TXT)
track.NEU.rovr.L1+L2 (TXT)

Results from the 2010 MIT survey

TR02.sum (TXT) TR02.out (TXT) TR02.NEU.rovr.L1+L2 (TXT) TR02.NEU.rovr.LC (TXT)
TR0p.sum (TXT) TR0p.NEU.rovr.P1+P2 (TXT)
23 Applications, High-rate GPS results, and Tools (PDF - 6.4MB) Applications to tectonic problems
Tools used to generate some of the figures
GAMIT/GLOBK MATLAB Tools