Citation
Abstract
An approach toward choosing optimal sets of frequency channels for bandwidth synthesis in radio interferometry is presented and applied to 14-channel 2.2-/8.4-GHz (S-/X-band) very long baseline interferometry (VLBI) observations. It is shown that arrays with nonredundant autocorrelations in general have a higher ratio of the delay resolution function central maximum to the nearby side lobes than do arrays with partially or fully redundant channel spacings. Results from an algorithm that selects such arrays are presented, and delay resolution functions for a variety of channel sequences are documented. A proposed near-optimal sequence for mode-A S-/X-band VLBI observations (which use both upper and lower side bands as compared with the single-side-band mode-C observations) is presented and shown to give significantly improved side-lobe behavior as compared with a commonly used mode-C sequence adapted to mode A.
Keywords
Details
- Volume
- 42-133
- Published
- May 15, 1998
- Pages
- 1–27
- File Size
- 842.3 KB