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uav_integrated_navigation's Introduction

UAV_Integrated_Navigation

Preface

  1. 遵循“先解释,后执行”的原则,注释总是写在对应程序的前面(上方)

  2. 注意:在matlab程序中表示同时具有上标和下标的变量时,严老师书上的程序案例按照“上标在前,下标在后”的原则,我的习惯是按照 “下标在前,上标在后”的原则。eg:书中对于 "从b系到n系的过渡矩阵" Cbn 的写法为Cnb。

  3. 程序中,总是按照如下方式定义变量:

    1. pos : [ 纬度, 经度, 高度 ] 单位为rad, rad, m
    2. vn : [ vE, vN, vU ] 单位为m/s

    若无特地声明,表示角的大小的变量的单位总是rad,其他物理量的单位总是相应的国际单位。

  4. 以_ref结尾的变量,注释中称其为“参考值”,“标准值”。这两种说法均表示“真实值”或“没有误差的值”。其中,本人更愿意把实测数据中的高精度参考称为“参考值”,把仿真程序生成的绝对准确的结果称为“标准值”,但真正写到程序里时也没区分那么细。

  5. 通过仿真程序生成的数据以_SD作为结尾。

  6. k_init 特指初始时刻数据的对应编号

Meaning of some abbreviation

ref: reference msr: measurement sv: save err: error prv: previous opt: optimal sml: simulation crt: current init: initial num: number smpl: sample cmpt: compute Lp: loop idx: index SD: simulation data

导航专用缩写:

avp: attitude、velocity、position pos: positon att: attitude vn: ground velocity acc: accelerometer gyr: gyroscope ang: angle

What's included in this code Repo.?

  • 惯导解算程序
  • 卡尔曼间接滤波算法(导航误差作为状态变量)
    • 输出校正:估计的误差状态仅用来更新导航输出,不对惯导解算进行纠正
    • 反馈校正:利用误差估计对惯导解算过程进行校正

Further work

  • Sage-Husa自适应滤波算法
  • 强跟踪卡尔曼滤波算法
  • ... ...

References

  • [1] 严恭敏, 捷联惯导算法与组合导航原理.
  • [2] 王辰熙, 南航

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