CAJ | 학술논문

针对非合作低信噪比环境下的卫星通信信号检测问题,在信号子空间维数估计的基础上,提出了一种基于奇异值分解的多卫星信号盲检测方法.该方法充分利用奇异值与特征值之间的关系,设计检测统计量将多个信号能量集中起来进行考虑,以适应更低的信噪比,并从理论上对检测性能进行了推导分析.仿真结果表明,该方法简单高效,针对不同的卫星信号,在虚警概率小于1%、信噪比为-11 dB时,盲检测概率均可达90%以上;同时能够在低信噪比环境下适应多信号环境,且其计算量相对特征值方法减少了一个数量级,更适合应用在星载设备上.
침대비합작저신조비배경하적위성통신신호검측문제,재신호자공간유수고계적기출상,제출료일충기우기이치분해적다위성신호맹검측방법.해방법충분이용기이치여특정치지간적관계,설계검측통계량장다개신호능량집중기래진행고필,이괄응경저적신조비,병종이론상대검측성능진행료추도분석.방진결과표명,해방법간단고효,침대불동적위성신호,재허경개솔소우1%、신조비위-11 dB시,맹검측개솔균가체90%이상;동시능구재저신조비배경하괄응다신호배경,차기계산량상대특정치방법감소료일개수량급,경괄합응용재성재설비상.
This paper introduces a method for blind detection of multi-satellite signals based on singular value decomposition(SVD)with low signal-to-noise ratio(SNR)in non-cooperative systems,by estimating the dimen-sion of signal subspace. The proposed method establishes a test statistic by making full use of the relationship between singular value and eigenvalue,which can gather multiple signal energy. This method can be applied to lower SNR,and the detection performance is analyzed theoretically. Simulation results for common satellite sig-nal indicate that the method is efficient and can adapt to multi-satellite signals under lower SNR,when false alarm probability is set to less than 1%,the blind detection probability reaches above 90% at SNR= -11 dB. And the computation complexity is reduced tenfold,which can be used in satellite-borne equipment.