摘要
惯性制导设备初始方位角标定通常采用一等天文方位角作为基准。在实际作业中,标定位置常因场地受限而无法直接进行天文观测,需要通过边角测量将实测天文方位角精确传递至标定位置。因此,标定基准方位角的精度受天文方位角测量精度和方位角传递精度的共同影响。对近年实测的多组一等天文方位角成果进行统计分析,通过中误差和正反方位角不符值两个精度指标,估计一等天文方位角测量精度在±0.5″左右。角度传递测量后,按照导线网平差中最弱边方位角精度估计公式,在传递4次的情况下,方位角闭合传递得到的基准方位角精度在±1.2″左右;经纬仪互瞄传递得到的基准方位角精度在±0.8″左右。
The first-order astronomical azimuth usually serves as the datum to calibrate the initial azimuth of the inertial guidance.In practice the astronomical observation often can’ t be directly carried out at the calibrating site limited by the surroundings.Then it is needed to do azimuthal transmission by surveying distances and angles from the near astronomical azimuth.Therefore,both the accuracy of the astronomical azimuth and that of the azimuth transfer influence the accuracy of the azimuth of the calibrating datum.The accuracy of the first-order astronomical azimuth,the former,is of about ±0.5″ by the root mean square error (RMSE) and the discrepancy between the forward and backward azimuths.The latter,if the traverse network is adopted,the datum azimuth accuracy is about ±1.2″ by estimating the closure of the weakest side after 4 transfers,while the accuracy is about ±0.8″ if using the reciprocal observations of the theodolites.
作者
刘新江
郑勇
詹银虎
何东汉
LIU Xinjiang;ZHENG Yong;ZHAN Yinhu;HE Donghan(Information Engineering University,Zhengzhou 450001,China;32021 Troops,Tianjin 300140,China)
出处
《测绘科学技术学报》
北大核心
2019年第1期6-10,共5页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(11673076
41604011
41704006)
关键词
天文方位角
惯性制导
角度平差
互瞄
精度分析
astronomical azimuth
inertial guidance
angle adjustment
reciprocal observations
accuracy analysis
