Coherence loss and delay observation error in very-long-baseline interferometry

Details Coherence loss and delay observation error in very-long-baseline interferometry Coherence loss and delay observation error in very-long-baseline interferometry

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rarlj..30...59k&link_type=abstract

Radio Research Laboratories, Journal (ISSN 0033-8001), vol. 30, March 1983, p. 59-87.

Physics

5

Error Analysis, Losses, Phase Coherence, Signal To Noise Ratios, Very Long Base Interferometry, Signal Processing, Signal Reception, Time Lag, Video Data

Scientific paper

Signal-to-noise ratio (SNR) in very long baseline interferometry (VLBI) is reviewed. A VLBI observation is first summarized from the viewpoint of signal processing, and the SNR of one observation channel is defined by a function of system parameters. Delay observation error is given in terms of the SNR and an improvement factor of bandwidth synthesis by taking coherence loss into account. Almost all loss factors found in an imperfect VLBI system are considered, and an estimate of the loss for one system is presented. Coherence loss due to phase fluctuations in the atmosphere is estimated by using models for the worst, best, and typical weather conditions. Estimations of delay observation error are given for concrete cases of VLBI experiments.

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