摘要
对卫星转发器的信号模型进行分析,根据正常卫星业务信号和盗用扩频信号的特点,对接收信号进行了带阻滤波,削弱了卫星业务信号能量,并对滤波后信号进行循环自相关检测。通过循环自相关谱峰特征,即可判断出是否含有直扩信号,并能检测出直扩信号的伪码速率。在此基础上,通过搜索二维循环自相关矩阵每个循环频率上对应的最大相关值,形成新的一维矩阵,可以显著提高检测准确性。
The signal model of satellite transponder is analyzed. Based on the features of received signal, the normal satellite service signal can be eliminated effectively by filtering. By the features of cyclic-autocorrelation spectrum, it could be decided whether it contains DSSS and its pseudo random code rate. Searching the maximum of each cyclic frequency in the two - dimension cyclic-autocorrelation matrix, a new one-dimension vector would be created, which increases the detection accuracy greatly.
出处
《电子信息对抗技术》
2010年第1期1-4,14,共5页
Electronic Information Warfare Technology
基金
国家自然科学基金资助项目(60872122)
关键词
卫星转发器
直接序列扩频
循环自相关
带阻滤波
satellite transponder
direct sequence spread spectrum （DSSS）
cyclic-autocorrelation
band-stop filtering
