基于GPS和里程计的快速行进间粗对准方法

Rapid coarse alignment for marching vehicle based on GPS and odometer

针对车载捷联惯导系统(SINS),提出一种快速行进间粗对准方法。将捷联矩阵分解为3个矩阵相乘,利用GPS提供的载体在导航坐标系的速度和里程计提供的载体在载体坐标系的速度构建不共线向量,求解初始载体坐标系相对惯性坐标系的常值转换矩阵,进而求得初始姿态矩阵。该对准方法对载车的唯一要求是在对准过程中做一个转弯机动。与现有对准方法相比,该方法没有用到加速度计信息。仿真结果表明,该方法能在1 min之内完成粗对准,采用零偏为0.1(°)/h的低精度陀螺,对准误差小于0.3°。

Aimed at vehicle-mounted strap-down inertial navigation system（ SINS）,a rapid coarse alignment method for marching vehicle is proposed. The matrix between navigation frame and body frame is decomposed into three parts. The problem to solve the matrix between navigation frame and body frame is attributed to solving the matrix between initial body frame and inertial frame,which can be obtained by the non-colinear vectors constructed with the vehicle＇s velocity from GPS in navigation frame and that from odometer in body frame. The only requirement of this alignment method for marching vehicle is a turning movement in the alignment stage. Compared with the existing alignment methods,this method does not use the measurement information of accelerometers. The simulation results show that the coarse alignment can be fulfilled in 1 minute,and the alignment error is less than 0. 3° with low accuracy gyros whose zero bias is 0. 1（ °） / h.