高动态条件下SINS辅助GNSS信号捕获的性能分析  

Performance analysis on high dynamic signal acquisition aided by SINS for GNSS satellites

作　　者：何晓峰[1] 聂祖国[1] 于慧颖[1] 秦海力 

机构地区：[1]国防科技大学机电工程与自动化学院,长沙410073 [2]总装备部装备管理信息办公室,北京100035

出　　处：《中国惯性技术学报》2011年第4期447-451,共5页Journal of Chinese Inertial Technology

基　　金：国家863计划(2006AA12Z319);高等学校博士学科点专项科研基金资助(20069998009)

摘　　要：采用SINS辅助GNSS信号捕获是提高GNSS接收机动态性能的有效方法。针对SINS辅助信号捕获过程中SINS误差本身受动态特性影响的问题,考虑高动态条件下SINS的运动相关性,分析了SINS辅助卫星信号捕获的性能。基于SINS辅助卫星信号捕获原理,利用SINS速度误差方程,推导了SINS性能与信号捕获性能之间的关系。仿真结果表明,在典型高动态轨迹下即使采用低精度SINS辅助信号捕获,也能有效提高捕获的灵敏性。采用100(°)/h精度的陀螺与1 mg精度的加速度计组成的SINS进行辅助,GNSS信号捕获灵敏性至少能够提高4.2 dB?Hz,并且减小了平均捕获时间。考虑SINS运动相关性的辅助信号捕获性能分析方法是有效的且更符合实际,对工程应用具有参考价值。GNSS receiver dynamic performances of signal acquisition can be improved with the aid of SINS.Performance analysis of SINS aided acquisition based on motion dependence of SINS performance is evaluated in the high dynamic situation in order to solve the difficulty of SINS errors influenced by motion characteristic.The equations of performances between SINS and signal acquisition are induced using SINS velocity errors＇ equations based on the principle of SINS aided satellites signal acquisition.Simulation experiments illustrate that the aided acquisition method with SINS composed of 100（°）/h bias drift gyros and 1 mg bias drift accelerometers can enhance the sensitivity of probability of detection to up to 4.2 dB·Hz compared with unaided acquisition.Meanwhile,the average acquisition time is decreased greatly.So the method for performance analysis of SINS aided satellite signal acquisition,considering SINS motion correlation,is effective and more actual and useful for engineering applications.

关 键 词：全球卫星导航系统 捷联惯性导航系统 信号捕获 辅助 高动态 性能分析 

分 类 号：U666.1[交通运输工程—船舶及航道工程]