API Application Programmers Interface. CPPUnit The C++ unit testing framework. CVIEW C File View DFT Discrete Fourier Transform GAMIT Global Positioning System At Massachusetts Institute of Technology GDMS Geodetic Data Modelling System GPS Global Positioning System FFT Fast Fourier Transform FFTW Fastest Fourier Transform in the West, a C library to perform Fast Fourier Transforms. IDFT Inverse Discrete Fourier Transform IFFT Inverse Fast Fourier Transform ISIP Institute for Signal and Information Processing, Mississippi State University JUnit The Java unit testing framework. MIT Massachusetts Institute of Technology NTB Normalised Transition Bandwidth, used for tuning the Dolph-Chebyshev window OO Object Oriented. PSD Power Spectral Density SLR Satellite Laser Ranging SQL Structured Query Language TSVIEW Time Series View VCV Variance Co-variance VLBI Very Long Baseline Interferometry