为了在保证寻北精度的基础上缩短寻北时间，根据捷联寻北系统的工作原理及工程实践，在传统的固定采样周期的基础上，设计了一种变周期采样方法。该方法以每个测量位置的动调陀螺的采样方差为基准，设定采样周期，在保证每个测量位置采样精度的同时，缩短采样周期，进而缩短整个寻北时间，避免了定周期采样时寻北时间和寻北精度之间的矛盾。实验结果表明，在保证寻北精度（小于30"）的前提下，寻北时间从4.5min缩短到3.5min以内，有效地提高了寻北效率。%In order to ensure the accuracy for the north-seeking on the basis of shortening the time of seeking north, according to the working principle of strap-down north-seeking system and engineering practice,a variable sampling pe-riod method is designed based on the traditional fixed sampling period. In this method, each measure position dynamic tuning gyro sample variance is taken as a benchmark,and sampling period is set to ensure each measuring location ac-curacy of sampling at the same time in order to shorten the sampling period and thus shorten the entire north-seeking time. The contradiction of north-seeking time and precision in the fixed sampling period are avoided. The experimental results show that the premise of seeking north time is shortened from 4.5 min to 3.5 min under the guarantee accuracy of north (less than 30"). The north-seeking efficiency is improved effectively.
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