惯性辅助的多段重合P码快速直接捕获方法

发布时间：2018-05-01 06:19

  本文选题：P码 + 惯性系统　； 参考：《中国惯性技术学报》2014年04期

【摘要】：为满足复杂环境下快速高精度定位的需求,针对传统P码捕获方法存在信号检测概率与捕获速率低的问题,设计了多段重合折叠的P码处理方法,对本地码序列进行折叠预处理,有效增加了相同长度本地码的信息利用率,提高相关运算处理效率。提出惯性辅助多段重合折叠的P码直接捕获方法,采用惯性辅助信息缩小多普勒频率搜索范围,同时自动调整相关控制参数,实现高动态及弱信号环境下P码的快速捕获。仿真分析表明,此方法能有效提高了P码捕获效率,尤其在高动态状态下能有效提高对卫星信号检测能力,在载噪比为30~40 dB·Hz的环境下,利用惯性辅助P码的方式能使捕获概率可提高10%,捕获时间可减少30%左右。
[Abstract]:In order to meet the need of fast and high precision localization in complex environment, a multi-segment coincident folding P-code processing method is designed to solve the problem of low signal detection probability and acquisition rate in the traditional P-code acquisition method. The folding preprocessing of local code sequences can effectively increase the information utilization rate of local codes of the same length and improve the efficiency of correlation processing. A method of direct acquisition of P-code with inertial auxiliary multi-segment coincidence folding is proposed. The search range of Doppler frequency is reduced by using inertial auxiliary information and the control parameters are adjusted automatically to realize the fast acquisition of P-code in high dynamic and weak signal environment. The simulation results show that this method can effectively improve the efficiency of P-code acquisition, especially in the high dynamic state, the detection ability of satellite signals can be improved effectively, and the carrier to noise ratio is 30 ~ 40 dB Hz. The acquisition probability can be increased by 10% and the acquisition time can be reduced by about 30% by using inertial auxiliary P code.
【作者单位】： 南京航空航天大学导航研究中心;
【基金】：国家自然科学基金(61273057,91016019) 航空科学基金(20100852010)
【分类号】：TN961
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本文编号：1828104