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HXT-Style Modulation Patterns

The HXT style of operation is to use individual modulation patterns for each and every every time bin. This is the approach we have used in the HESSI back-projection and CLEAN programs. The main advantage of the method is simplicity, since there is no need to go into the complex plane or to compute complex exponentials. One disadvantage of this method is that it requires a large amount of intermediate storage, since there must be as many modulation patterns (maps) as there are visibilities (bins). As we show below, however, the HXT-style representation requires an almost unmanageably large amount of storage if all the modulation patterns must be in memory.

An example of some HESSI modulation patterns:

And so on....



Ed Schmahl
2/8/1999