遥感卫星多路数据传输系统同频共用方法

为节省频率资源，遥感卫星通常采用扩频体制实现多路数据的同频共用传输，针对通道间容易引起相互干扰的问题进行了研究，通过改进码分多址干扰估算模型，对采用平衡Gold码序列扩频系统抗干扰容限上界进行预测。在满足国际电信联盟（ITU）对卫星辐射功率通量密度约束条件下，提出了一种基于直接序列扩频体制的两路业务数据同频共用传输方法。仿真结果表明：当载波频率2GHz左右，两路辐射源的EIRP之差不大于8～15dBw时可以实现同频共用传输；如对信号扩频带宽进行差异化处理，则其相互兼容性还可进一步提高。

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

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.