FREQUENCY HOPPING RADIO EQUIPMENT

摘要

PURPOSE:To quickly and accurately perform synchronous acquisition of frequency hopping even when an interference wave coexists by applying such a control that the correlative detection of output from a reception side mixer is performed by an inverse spreader at the timing of the output, signal of a pseudo noise generator for direct spread and the synchronous acquisition of the frequency hopping of the pseudo noise generator on the reception side is performed at that timing by an acquisition controller. CONSTITUTION:The carrier of several hops at the beginning of transmission start is modulated by a signal from the pseudo noise generator 14a for direct diffusion according to a code series instead of input data from a data input terminal 1. The switching it is performed by a change-over switch 15. The reception side awaits the signal, and performs the correlative detection by the inverse spreader 16 at the timing of a pseudo noise signal from the pseudo noise generator 14b for direct spread and acquires the timing by a timing detector 17, and inputs it to the acquisition controller 13, thereby, the frequency hopping can be acquired. In other words, when the coincidence between frequencies of transmission and reception is obtained and also, correlation for direct spreading is taken, acquisition is completed, and processing is shifted to tracking.