Frequency hopping communication system

摘要

A signal modulated with information is hopped to discrete frequencies and its phase is selected to be 0 DEG or 180 DEG in each frequency hop interval under control of a pseudo noise binary code signal produced by a code generator. The discrete frequencies are generated in a binary frequency synthesizer and the phase is selected by a balanced modulator. One embodiment is a transceiver employing a single code generator for both transmission and reception. In another embodiment, a code generator is employed at the transmitter and another code generator is employed at the receiver of a communication system. In each embodiment, acquisition circuitry is employed to synchronize the code signal to the received frequency hopped and phase selected signal for synchronous detection of the information.