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作 者:褚梓樾 王雪[1,2,3] 赵航 商鹏[1,2,3] CHU Ziyue;WANG Xue;ZHAO Hang;SHANG Peng(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 101408,China;Key Laboratory of Precision Navigation and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China)
机构地区:[1]中国科学院国家授时中心,陕西西安710600 [2]中国科学院大学,北京101408 [3]中国科学院精密导航定位与定时技术重点实验室,陕西西安710600
出 处:《系统工程与电子技术》2021年第2期285-293,共9页Systems Engineering and Electronics
基 金:国家自然科学基金(11873009)资助课题。
摘 要:测控信号的调制指数可作为非合作卫星辐射源识别的一个稳定特征参数,针对非合作统一S频段测控信号,提出一种基于频域谱分析的调制指数估计算法。根据该信号的频谱特性构造调制指数估计算法,并对该算法的估计误差进行理论分析。通过蒙特卡罗仿真给出估计误差随信噪比变化的情况,并利用实测信号从频域和时域两个方面对该算法的性能进行验证。结果表明,实测信号与恢复信号的频谱幅度误差较小、时域基带信号波形的一致性较高、归一化互相关函数最大值接近于1。进一步说明该算法的精度较高,可为非合作卫星辐射源识别提供高精度的参数支撑。Modulation index for telemetry tracking and command(TT&C)signals can be used as a stable characteristic parameter for non-cooperative satellite emitter identification.Aiming at the non-cooperative unified S band(USB)TT&C signals,a modulation index estimation algorithm based on frequency domain spectrum analysis is proposed.According to the spectrum characteristics of the signal,the modulation index estimation algorithm is constructed,and the estimation error of the algorithm is analyzed theoretically.Monte Carlo simulation shows the variation of estimation error with the signal to noise ratio,and the performance of the algorithm is verified by the measured signal in both frequency and time domains.The results show that the spectrum amplitude error between the measured signal and the recovered signal is small,the time domain baseband signal waveform has high consistency,and the maximum value of normalized cross-correlation function is close to 1,which further shows that the proposed algorithm has high precision and can provide high precision parameter support for non-cooperative satellite emitter identification.
分 类 号:TN911.6[电子电信—通信与信息系统]
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