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chill_notes/专业领域/GNSS/闭合差.md
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闭合差的定义
闭合环路检验是检测基线质量的有力方法。
闭合环可分为同步环、异步环和重复基线。
闭合环的闭合差在理论上应为0在实际测量中允许偏离一定的值
闭合环的限差请参见有关文献。
环的闭和差有以下几类:
1、分量闭合差
![Exported image](Exported%20image%2020260407225348-0.png)
2、全长相对闭合差
![Exported image](Exported%20image%2020260407225350-1.png)