信号失效 meaning in English

sf signal fail

This paper gives a time - synchronization technique bases on gps time service signal which is used in broad band seismic recorder 。 by world coordination time offered by gps - - utc ( usno ) , adjust local clock base on gps signal , gain high nicety clock signal , clock precision reachs 10 - 6 。 this clock is the time source of broad band seismic recorder , bring the whole seismic recorder works in same time base . 1pps time base with high stability can be used as in - phase , spring , time and start - stop of every collection mode , while the scale under second make a precise time mark to receive data of broad band seismic recorder
针对接收机中gps信号的噪声进行kalman滤波软件处理, kalman滤波可以对gps信号与本地晶振时钟的时差数据在大噪声中进行平滑,在较短时间内估计出高精度的时差数据。系统消除了gps秒脉冲信号的ms级随机误差,把晶振秒脉冲的长期稳定度锁定到gps信号的稳定度上;在gps信号失效时给出了可行措施,能够保证在任何情况下产生一个稳定、高精度秒脉冲信号,误差在1 s内。