Deterministic transfer function for transionospheric propagation
Recent interest in ground-to-satellite propagation of broadband signals has prompted investigation into the development of a transfer function for the ionosphere that includes effects such as dispersion, refraction, changes in polarization, reflection, absorption, and scattering. Depending on the application (e.g. geolocation), it may be necessary to incorporate all of these processes in order to extract the information of interest from the measured transionospheric signal. A transfer function for midlatitudes at VBF from 25--175 MHz is one of the goals of the BLACKBEARD program in characterizing propagation distortion. In support of this program we discuss in this paper an analytic model for the deterministic transfer function of the ionosphere that includes the effects of dispersion, refraction, and changes in polarization to second order in the parameter X = {omega}{sub pe}{sup 2}/{omega}{sup 2} where X is assumed to be small compared to one, {omega}{sub pe} is the peak plasma frequency of the ionosphere, and {omega} is the wave frequency. Analytic expressions for the total phase change, group delay, and polarization change in a spherical geometry assuming a radial, electron density profile are presented. A computer code ITF (Ionospheric Transfer Function) that makes use of the ICED (Ionospheric Conductivity and Electron Density) model to ,venerate electron density profiles was developed to calculate the ionospheric transfer function along a specified transmitter-to-receiver path. Details of this code will be presented as well as comparisons made between ITF analytic results and ray-tracing calculations.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7158495
- Report Number(s):
- LA-UR-92-2607; CONF-9207118--2; ON: DE92040327
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTER CODES
DISPERSION RELATIONS
EARTH ATMOSPHERE
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
FREQUENCY DEPENDENCE
FREQUENCY RANGE
FUNCTIONS
IONOSPHERE
MHZ RANGE
PLANETARY IONOSPHERES
PULSES
RADIATIONS
SATELLITES
SIGNAL DISTORTION
T CODES
TRANSFER FUNCTIONS
WAVE PROPAGATION