城市环境GPS/UWB组合系统定位精度研究

GPS可见卫星数量不足使得观测方程抗差性下降,在城市环境下一般难以精确定位。文章通过GPS/UWB组合定位抑制GPS观测粗差对定位精度的影响,提升组合系统的定位性能。实验证明,组合系统较GPS单系统在观测值数量、RDOP值、浮点解精度、双差模糊度浮点解精度和固定解精度方面均得到大幅改善。文章认为,借助UWB优秀的测距性能有效地提高了GPS的生存能力,特别是在城市峡谷等GPS信号遮挡严重的环境下应加设一定数量的UWB基准站,保证用户定位的连续性与准确性。

The Research on Positioning Accuracy of GPS/UWB Integrated System in Urban Environment

The inadequate number of GPS visible satellites reduces the robustness of the observation equation,it is difficult to locate accurately in urban environment.In this paper,GPS/UWB integrated positioning is used to restrain the influence of GPS observation gross errors on positioning accuracy and improve the positioning performance of the integrated system.Experiments show that the combined system has greatly improved the number of observations,RDOP values,floating-point solution accuracy,double-difference ambiguity floating-point solution accuracy and fixed solution accuracy compared with GPS single system.The paper considers that the survivability of GPS is effectively improved by the excellent ranging performance of UWB.Especially,a certain number of UWB reference stations should be set up under the severe occlusion of GPS signals such as urban canyons to ensure the continuity and accuracy of user positioning.