Work on the Fringe Fitting project at Jive has concentrated on two areas, 1) continued development on the Casa implementation, and 2) development of Python software for research and development to facilitate experimenting and testing of ideas before incorporation into the Casa implementation.

The Casa implementation of a baseline based Delay, Rate solver has been optimized to speeding up the FFT stage of the existing implementation. Work is currently concentration on incorporating the baseline stacking code into Casa. The goal is to implement it independent of the fringe fitting code so it can also be used elsewhere in Casa.

The above mentioned Python software simulates data with user specified delay and rate properties. And provides a platform for testing solver algorithms. It has been used to experiment with using Casacore's solvers in the baseline based solver for increased accuracy and speed. The effects of dispersive delays are also been studied with this software to develop a strategy for the application of Fringe Fitting to wide band data. VLBI instruments around the world are currently undergoing bandwidth upgrades. Wide band delay calibration may also be useful for the instruments in current commissioning and development.