RECOVERY OF INFORMATION TRANSFERRED INTO PHASE MODULATION IN IONOSPHERIC WAVE PATHS
Abstract
Recovery of the information which though originally impressed onto a signal as amplitude modulation, has been changed to phase modulation by travelling through the ionosphere, was studied. The possibility of an at least partial recovery of the information changed to phase modulation, by means of a double homodyne detector was studied. On the basis of theory, an experimental device which was developed is described, and some of the results obtained are given. With a view to checking its performance, an ionospheric simulator was constructed. This is capable of supplying altered waves, similar to those subject to multiple paths or to sideband rotations. The working principle and circuit diagrams are given, as well as a block diagram of a new device for the recovery of information, which seems to have some advantages over the one already constructed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1962
- Accession Number
- AD0282960
Entities
People
- Giovanni Marchetti
- Mario Mancianti
Organizations
- University of Pisa