THEORY OF THE MULTIPATH PROPAGATION OF FREQUENCY MODULATED WAVES

摘要

This report develops a general theory of the propagation and reception of multitone frequency-modulated electromagnetic waves which are received both directly without reflection and also indirectly after reflection from an arbitrarily located and oriented surface. The transmitting and receiv¬ing antennas are assumed to be arbitrarily oriented. They are also assumed to have properties as general as are consistent with the following behavior: with reception of the direct ray alone, the instantaneous frequency of the receiver voltage follows faithfully the instantaneous frequency of the transmitter voltage.