GNSS流动观测水平速度精度评估

ACCURACY EVALUATION OF HORIZONTAL VELOCITY MEASURED BY GNSS MOBILE OBSERVATION

利用GNSS连续观测数据评估了GNSS流动观测水平速度精度,并分析了相邻两期观测时间差、每期观测时长、观测周期对水平速度精度的影响。结果表明:按照目前的观测模式,流动观测与连续观测得到的水平速度值之差的绝对值在3 mm/a以内;相邻两期观测时间不一致会影响流动观测水平速度的精度,如果绝对值在3 mm/a以内的速度差为可接受值,那么建议相邻两期观测时期差应控制在25天之内;延长每期观测时间和缩短观测周期能提高流动观测水平速度精度。

The accuracy of horizontal velocity measured by GNSS mobile observation was evaluated by continuous observation,and the effects of difference of observation time period between two adjacent observations,observation time and observation cycle on the accuracy were also analyzed.The results show that,according to the current observation style,the absolute value of difference of horizontal velocity between mobile and continuous observation is less than 3mm/a.The difference of observation time period between two adjacent observations can affect the accuracy of horizontal velocity.If the difference which is less than 3 mm/a can be accepted,it is suggested that the difference of observation time period in the two years should be less than 25 days.The accuracy can be improved by prolonging observation period and shortening observation cycle.