====== Chapter 2 Global Navigation Satellite System ======
=====   2.1 GNSS Overview =====

=====   2.2 Ground Based Augmentation System =====


伪距误差源（加粗项可用差分技术消除）：
  *   **星历误差**
  *   **卫星钟差**
  *   **电离层误差**
  *   **对流层误差**
  *   多径误差
  *   接收机误差


=====   2.3 Satellite Based Augmentation System =====

=====   2.4 Aircraft Based Augmentation System =====