摘要
伽利略系统采用了长扩频码序列以提高扩频码的互相关性能,但同时大大增加了搜索区间,采用单驻留搜索策略的系统平均捕获时间将因此增加数倍.使用双驻留机制对系统性能进行优化,在系统虚警概率和发现概率保持不变的前提下,将典型信噪比下的平均捕获时间减小20%～90%.系统仿真证明了算法的有效性.
Long spread spectrum code is applied in the Galileo system in order to improve the cross-correlation isolation ability. Longer spread spectrum code enlarges the search region which doubles the mean acquisition time when the single dwell strategy is adopted. The double-dwell strategy is proposed in this paper to optimize the system performance and the mean acquisition time is thus reduced up to 20 to 90 percent with given false alarm probability and detection probability. System simulation validates the strategy.
出处
《微电子学与计算机》
CSCD
北大核心
2010年第4期99-102,共4页
Microelectronics & Computer
基金
国家"八六三"计划项目(2007AA12Z344)
关键词
伽利略
长码
双驻留
平均捕获时间
Galileo
long code
double dwell
mean acquisition time
