Common frequency sharing method for multi channel mission data transmission system of remote sensing satellites

doi:10.16708/j.cnki.1000-758X.2022.0052

Abstract

Abstract: In order to save frequency resources，spread spectrum communication is usually used to realize multi-channel mission data transmission sharing the common frequency in remote sensing satellite.Regarding to the mutual interference caused by multi-channel transmission signals，a new common frequency sharing method for two-channel mission data transmission based on direct sequence spread spectrum was proposed.This method calculates the tight jamming margin for balanced Gold sequence spread spectrum system through improved interference estimation model of CDMA.Meanwhile，it also satisfies the ITU′s constraints of emitter power flux density.Simulation results show that the common frequency can be shared in the two signals when the difference of two emitter signals EIRP is less than 8-15dBw in carrier frequency 2GHz.The performance compatibility could be improved if the measures of spread spectrum bandwidth differentiation processing are taken.

Key words: remote sensing satellite, multi-channel mission data transmission, direct sequence spread spectrum, jamming margin, power flux density

GAO Weibin, ZHANG Hanqing, SHI Yunchi. Common frequency sharing method for multi channel mission data transmission system of remote sensing satellites[J]. Chinese Space Science and Technology, 2022, 42(4): 54-60.

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URL: https://journal26.magtechjournal.com/kjkxjs/EN/10.16708/j.cnki.1000-758X.2022.0052

https://journal26.magtechjournal.com/kjkxjs/EN/Y2022/V42/I4/54

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Common frequency sharing method for multi channel mission data transmission system of remote sensing satellites

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