车速飞快时信号不稳定，在地下则根本没信号，但是总体质量是在不断上升的。
The reception isn't great while travelling at speed and doesn't work at all underground. But the quality is improving all the time.
在实际应用中提出了解决现场信号不稳定的两种测量方法，即周期计数和定时截取的测量方法。
Two measuring methods of period-counting and timing break forward in order to practically solve the unsteadiness of the site signal.
针对微惯性测量组合无法长时间单独工作、GPS卫星信号不稳定的问题，提出MIMU/GPS组合导航的方法。
MIMU/GPS integrated method is proposed for solving the problem that MIMU can not work alone for long time and the signal of GPS is not stable.
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