precession period estimation
precession period estimation
岁差周期估计
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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However, the lower bound of the precession period provided may be far less than the true precession period, which will seriously degrade the estimation performance.
进动周期下限可能远小于真实进动周期，此时自相关法的估计性能将严重下降。
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