| 摘要 |
<p>PURPOSE:To attain the data communication between optional terminal equipments by the CSMA/CD system by using a terminal equipment having a function sending a data to a satellite resending a reception data in a carrier frequency different from a carrier of the reception data, demodulating the present data and comparing it with an original data. CONSTITUTION:A transmission data and a destination identification data of a data transmission/reception section 1 are sent from an antenna 5 as a high frequency radio wave signal while being superimposed on a carrier signal of a transmitter 2 in case any terminal equipment has no transmission from other terminal equipments. The radio wave signal is received by an antenna 10 of a satellite 100 and formed into a reception high frequency signal by a receiver 6. After the signal is converted into a signal having a frequency different from that of the received high frequency signal by a mixer 7 next, the result is amplified by an amplifier 9 and resent from the antenna 10. The resent high frequency radio signal is received and demodulated by a receiver 3. Moreover, the terminal equipment side sending data and the received data are compared by a comparator 4 at the base band level, and as a result, if the transmission data differs from the received data, the original data is sent again after a prescribed time.</p> |
