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Coherence bandwidth loss in transionospheric radio propagation
Author(s) -
Rino C. L.,
Gonzalez V. H.,
Hessing A. R.
Publication year - 1981
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs016i002p00245
Subject(s) - physics , jitter , wideband , ultra high frequency , bandwidth (computing) , coherence bandwidth , coherence (philosophical gambling strategy) , mutual coherence , optics , group delay and phase delay , computational physics , mathematical analysis , delay spread , mathematics , telecommunications , fading , computer science , algorithm , decoding methods , quantum mechanics
In this paper a theoretical model that predicts the single‐point, two‐frequency coherence function for transionospheric radio waves is developed. By using an asymptotic approximation a single parameter was isolated, which gives the functional dependence on perturbation strength, propagation distance, and fractional frequency separation. The model is compared to the measured complex frequency correlation function by using data from the seven equispaced, phase‐coherent UHF signals transmitted by the Wideband satellite. The model and data agreement is very good when allowance is made for a varying spectral index. The pulse delay jitter induced by the coherence bandwidth loss is also computed and compared with the actual delay jitter observed on synthesized pulses obtained from the Wideband UHF comb. Again, the data are in good agreement with the theory. The ramifications of the asymptotic approximation vis a vis the more commonly used quadratic approximation are also discussed.