长周期DSSS/BPSK卫星信号载频和功率估计方法  

New method for long-period DSSS/BPSK satellite signal carrier detection and power estimation

作　　者：刘海波[1] 吴德伟[1] 袁银勇[1] 闫占杰[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《系统工程与电子技术》2013年第7期1380-1384,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(61174194)资助课题

摘　　要：针对长周期扩频卫星信号信噪比低、多普勒影响明显、码周期长等特点,提出了一种长周期直接序列扩频卫星信号载频检测和功率估计方法;分析了所提方法中多普勒频率线性近似对载频估计的影响,并进行了仿真验证。以全球卫星导航系统(global positioning system,GPS)星座参数为例,对所提方法进行了仿真,并分析了积分时长对本地频率搜索步长的影响。结果表明,所提方法能够有效抑制多普勒频率的影响,检测下限达到-12dB。Aiming at the problem that the long-period spread spectrum satellite signal is characterized by long cycle,low signal-to-noise ratio and considerable Doppler frequencies,a new frequency detection and power estimation method is proposed.The Doppler frequency linear approximation effects are analyzed and verified by simulations.Then,the capability of the proposed method is tested by using global positioning system（GPS） satellite parameters,and the impacts of the integration time length on the local frequency search step are analyzed.Simulations indicate the proposed method can well counteract Doppler frequency effects,and its capability reaches-12 dB.

关 键 词：直接序列扩频 长周期 相关累积 多普勒频率 

分 类 号：TN911.23[电子电信—通信与信息系统]