METHOD AND SYSTEM FOR ENSURING INTERCOMMUNICATION OF TWO RADIO-RELAY STATIONS Russian patent published in 1999 - IPC

FIELD: communications engineering. SUBSTANCE: method provides for communication between two radio-relay stations each one radiating microwave information-transfer signal to adjacent station and receiving it from the latter at same carrier frequency with time shared radiation and reception of signal at given station by time-division multiplexed channels. Provision is made at first station for time shift of initiation of received-signal sampling period relative to that of radiated signal which is a multiple of channel interval length. This is attained by measuring delay t_з1.2 of signal radiated by first station, received and re-radiated by second station towards first station, and by changing sampling period Tog

of signal radiated by first station to T_g1 so as to make it satisfy one of conditions or , where n is number of channel intervals in sampling period and usually n = 2^l; l = 5 through 9; k is integer number of channel intervals in remainder ; m = 2 through 4; is integer part of quotient. t_з1.2 can be found a priori by any known method, including that used in radio engineering. We propose measuring t_з1.2 prior to starting communications while radiating during certain period single channel interval frame sync signal within every four sampling periods using known method of pulsed range finding. System implementing this method is built up of two radio-relay stations each incorporating series-connected multiplexing equipment, AND gate, separating band filter, transmitter, TRANSMIT-RECEIVE switch with TR tube, and antenna; inserted between antenna output and input of multiplexing equipment synchronizing unit are series-connected second separating band filter and receiver. Series-connected modulating pulse shaper whose second input is connected to output of multiplexing equipment synchronizing unit and inverter whose input is combined with second input of AND gate are inserted between sync pulse generator output of multiplexing equipment and control input of TRANSMIT-RECEIVE switch with TR tube. In addition, series- connected sync pulse selector, delay measuring device whose second input is combined with input of modulating pulse shaper, and sampling period control device are inserted between receiver output and second input of multiplexing equipment synchronizing unit in first station. Second output of delay measuring device is connected to second input of modulating pulse shaper. EFFECT: reduced difference in carrier frequencies of simultaneously received adjacent symbols, simplified design of microwave receiving equipment, improved suppression of radiated signal at microwave receiver input. 4 cl, 2 dwg