混合固定效应敏感依靠规模变量，浮点运算的问题。
MIXED fixed effects sensitive to magnitude of dependent variable, floating point problems.
为解决状态观测器中采用传统浮点数运算时，因自动下溢出产生误差的问题，提出全整数运算算法提高控制精度。
To avoid the cumulative error problem caused by auto-overflow in state observer floating operation, the whole-integer operation was proposed to improve the control precision.
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