Ionospheric phase- and group-path

Physics

Scientific paper

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Scientific paper

For a 5 MHz continuous-wave transmission from WWV, Beltsville, Maryland, to Air Force Cambridge Research Laboratories (AFCRL), Bedford, Massachusetts, carrier- and modulation phase-measurements are discussed. Carrier phase perturbations due to mode interference are examined and the method used for obtaining relative phase path variations is described. For slightly different frequencies the modulation phase is used to determine the total group path. Phase- and group-path variations are illustrated for a night-time traveling ionospheric disturbance. The relationship between and the group path offers the possibility of measuring the transmission time of certain radio signals if transmitter and receiver are separated.

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