Baseline2-6 shows the operation on the longest baseline of the array. In this case there is interference between the complex spectrum of the interference and the source, evidenced in the rapid phase ramping in spectral region occupied by the interferece. A variant of the previous technique can be applied to the problem of the navigation satellite signals in this case the copy of the interference spectrum is obtained from the a priori published code for the satellite. A summary of these techniques was presented at a recent Jodrell bank meeting. Progress A recent 12 hour synthesis observation shows the promise of the technique.
Raw data shows the typical data - very strong interference in the centre of the band.
Cleaned spectrum shows the same visibility after automatic removal of the interference. The cleaned image shows the sources standing well clear of the background. The FWHP is 31 arcmin. This map was processed in the standard way - a phase calibrator was observed at regular intervals, and then used to provide the phase and gain corrections for the synthesis. The image was produced automatically - no hand editing was applied.