基于横向地球坐标的惯性导航方法

针对极区经线迅速收敛于极点造成的传统惯导机械编排在极区不适用问题,提出了CGCS2000地球椭球体模型下基于横向地球坐标的惯性导航方法。在构建横向坐标系及伪经纬网的基础上,给出了横向惯导与传统惯导间导航参数的转换关系,推导了横向地理坐标系机械编排,建立了系统误差模型,并以某型船舶为例,通过系统性能的静基座、动基座仿真分析,研究了基于横向地球坐标的惯性导航方法在极区的适用性。仿真分析表明,基于横向地球坐标的惯性导航方法可以克服传统惯导在极区存在的问题,在极点处不存在计算溢出,并可为载体穿越极点时提供高精度的姿态、位置信息,适用于极区。

Inertial navigation algorithm for polar region based on transverse terrestrial coordinate

Conventional inertial navigation system (INS) mechanization is not applicable in the polar region due to the polar meridians' quickly converging to the poles.To solve this problem,an inertial navigation algorithm with CGCS2000 earth ellipsoid model is proposed based on transverse terrestrial coordinate.Firstly,by constructing the transverse coordinate system and the false graticules,the navigation parameters' transfor-mational relation between transverse INS and conventional INS was presented.Then,the mechanization based on the transverse geographic coordinate system was deduced,and the error model of the system was established.Finally,by taking a certain type of ship as an example,the applicability of the inertial navigation algorithm based on the transverse terrestrial coordinate in polar region was studied by simulating and analyzing the system performances under the conditions of static base and dynamic base respectively.Simulation and analysis results show that the algorithm can overcome the above problem,and there is no calculation overflow at the poles.It can also provide high-precision attitude and position information for carriers passing through the poles.