基于延时相乘-相关的JTIDS检测  

JTIDS Signal Detection Based on Delaying Multiplication and Segment Correlation

作　　者：刘武刚[1] 杨建波[1] 刘鹏[1] 

机构地区：[1]空军航空大学,吉林长春130022

出　　处：《通信技术》2010年第5期7-9,共3页Communications Technology

摘　　要：文中在分析延时相乘检测法检测JTIDS信号的基础上,得出该方法可以在检测到信号的两倍载频后,利用MSK的调制特性,可以检测到JTIDS信号的扩频码元带宽,但在信噪比较低时,检测性能明显下降。因此提出延时相乘-相关检测法,利用信号参数的固定性和信号与噪声、噪声与噪声之间不相关的特性,在计算功率谱之前将信号分段,作相关处理后在相关域累加,加强表示信号参数的峰线,相对降低噪声功率谱,从而在低信噪比下得到信号的载频信息。仿真实验表明:此时改进的延时相乘检测法的检测性能至少提高了5dB。因而延时相乘-分段相关检测法能够在更低的信噪比下实现对JTIDS信号的有效检测。This paper first proposes and analyzes the delaying multiplication detection method,which could obtain twice of the carrier frequency and detect the bandwidth of the spread code in JTIDS signals.However,the detection performance would obviously decline when SNR is low.So delaying multiplication and segment correlation method is proposed.By utilizing the fixity of signal and noise,this method divides the signal into segments before calculates the power spectrum,then the signal segments are accumulated in correlation domain in order to enhance the signal line and decline the noise line.So the carrier information is acquired in low SNR condition.The simulation results show that the proposed method has a detection performance improvement of at least 5dB,thus could effectively detect the JTIDS signal in low SNR condition.

关 键 词：JTIDS 延时相乘 分段相关 

分 类 号：TN972.1[电子电信—信号与信息处理]