Evaluation and Analysis of BDS Instrumental Biases
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摘要: 差分码偏差(differential code bias,DCB)又称硬件延迟,是影响用户导航定位授时(pointing navigation timing,PNT)服务的主要误差源之一。GPS卫星的硬件延迟通常是在电离层建模过程中和电离层模型系数一起解得的,但是北斗系统目前仅是一个区域导航定位系统,无法通过单系统获得高精度的硬件延迟解。提出通过联合GPS和北斗卫星观测数据用低阶球谐模型建模的方式确定北斗卫星和接收机的DCB。实验数据表明在现有条件下采用该方式解算北斗卫星的DCB的精度在0.3 ns左右,稳定性较好,且北斗地球静止轨道卫星(GEO)、倾斜同步轨道(IGSO)卫星DCB稳定性好于中轨道(MEO)卫星,北斗卫星DCB的稳定性要优于接收机。Abstract: Differential Code Bias is also called instrumental bias,and is one of the main error sources affecting PNT services. GPS instrumental bias is usually solved with ionospheric model coefficients. However, BDS method is now a regional satellite navigation system, which is difficult to obtain precise instrumental bias results using only BDS itself. In this paper, we propose a means to estimate BDS satellite and receiver instrumental biases using combined GPS/BDS observations in spherical harmonics modeling. The precision of BDS satellite instrumental bias was about 0.3 ns using this method, and the GEO/IGSO satellite instrumental bias precision was more stable than the MEO satellites. Besides, the precision of the satellite instrumental bias is better than receiver instrumental bias.
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Keywords:
- DCB /
- TEC /
- ionospheric modeling /
- spherical harmonics /
- polynomial model
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