惯导速度辅助下GNSS高精度定位

传统的卫星导航接收机无法同时适应高动态和高精度要求。对于10g以上的加速度,高精度接收机很难达到高精度的指标,甚至基带环路失锁无法正常导航定位。针对GNSS动态条件下高精度定位需求,引入惯性/卫星深组合导航技术,在应用惯性信息辅助接收机减小基带跟踪环路带宽基础上,采用码片窄相关方法降低伪距抖动误差,提高动态条件下GNSS伪距定位精度。仿真结果表明:通过惯性信息辅助跟踪环路可实现较小跟踪环路带宽下的稳定跟踪;在此基础上,通过码片窄相关方法并提高射频前端带宽可实现定位精度的提高。对比传统的伪距定位方法,定位精度(1?)从6 m提高到3 m左右。

High-accuracy positioning of INS velocity-aided GNSS

Traditional satellite navigation system cannot simultaneously meet high-dynamic and high- accuracy requirements. When the acceleration is >10g, the high-accuracy receiver is hard to meet its high- accuracy requirement, and the base-band loop may even lose tracking, leading to abnormal positioning. To solve this problem, a deep-integrated GNSS/SINS navigation system is introduced to meet the high-accuracy positioning demand with high dynamic receiver. Based on decreasing the bandwidth loop bandwidth with INS velocity-aided receiver, the narrow correlation spacing is used to decrease the pseudo-positioning error. Test results show that the inertial information aided tracking loop can realize the stable tracking with narrow bandwidth of tracking loop, and then by using the proposed narrow correlation spacing method and increa- sing the RF front-end bandwidth, the positioning accuracy can be improved. Compared with traditional pseudo-positioning method, the positioning error (1σ) by the proposed method is decreased to about 3m from 6m.