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五、计时误差激光测距所用的标准历元参考时间是UTC(BIH)(国际时间局播发的协调世界时)或其近似值UTC(USNO)(美国海军天文台播送的协调世界时)。历元的保持精度取决于测站,并应由每个工作的测站提供。实际上,所有的站钟都定期地同可携带钟校准,并且每天至少用LORAN、GPS、电视接收机、甚低频或其它广播源监视一次。对于LAGEOS卫星,每圈1μs的历元误差约引人站位置误差4mm。1.用可携钟样准用可携钟校准的典型值是0.1～1.Oμs,其质量取决于可携钟、钟的旅途长度和站钟的质
V. Timing Errors The standard epoch reference time used for laser ranging is UTC (BIH) or its approximate UTC (USNO) (Coordinated Universal Time broadcast by the U.S. Navy’s Observatory). The retention accuracy of epochs depends on the station and should be provided by the stations at each site of work. In fact, all station clocks are regularly calibrated with a portable clock and monitored at least once daily using LORAN, GPS, TV receiver, very low frequency or other broadcast sources. For the LAGEOS satellite, an epoch error of 1 μs per revolution leads to a station position error of 4 mm. 1. The standard portable clock with a portable calibration standard is 0.1 ~ 1.Oμs, the quality depends on the portable clock, the clock length of the journey and clock quality