惯性辅助的多段重合P码快速直接捕获方法  

INS-aided fast direct P-code acquisition method using multiple replica coincidence operation

作　　者：李荣冰[1] 徐昭[1] 曹进[1] 刘建业[1] 

机构地区：[1]南京航空航天大学导航研究中心,南京210016

出　　处：《中国惯性技术学报》2014年第4期504-509,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(61273057;91016019);航空科学基金(20100852010)

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。In order to solve the problem of low detection probability and low acquisition efficiency and meet the requirements of rapid high-precision positioning in complex environment, a multi-segment overlap folding P-code acquisition algorithm was designed, which can increase the amount of information contained in the same length of local code and improve the efficiency of code correlation processing as a result of the folding preprocessing of local code. An INS-aided fast direct P-Code acquisition method using multiple replica coincidence folding operation was proposed, which narrows the Doppler range with the navigation parameters from INS and adjust the local control parameters automatically, therefore it can realizes the P code fast acquisition in high dynamics and weak signal environments. Simulation results show that this method can effectively improve the acquisition efficiency of P code, i.e., the acquisition probability can be increased by 10% and the calculation time consuming can be reduced by 30% in environments with carrier-to-noise ratio of 30-40 dB·Hz.

关 键 词：P码 惯性系统 直接捕获 组合导航 

分 类 号：TN911.8[电子电信—通信与信息系统]