4 Conclusion

A phase calibration scheme applicable to a "T'' array is presented using closure and redundancy techniques. When combined with self-calibration, this method is particularly suitable for obtaining radio maps of the Sun with good positional accuracy and signal-to-noise ratio, since it is generally difficult to obtain an adequate initial model for self-calibrating a source like Sun which can be highly complex at times.

Acknowledgements

The authors acknowledge helpful discussions with Masanori Nishio of Kagoshima University, Japan and R. Sridhar. One of the authors (R.R.) would like to thank Mark Wieringa of ATNF, Australia for useful suggestions, and Ketan Desai of NRAO, Socorro for help in self-calibration of the GRH data using AIPS.