some problems about DCB and sp3

[walkamonster]

Hello, author. May I ask if your program converts the reference frequency B3I of the B2b clock difference to an ionospheric combination of B1I/B3I during the decoding process? Furthermore, when generating the sp3 file in combination with the broadcast ephemeris, is there a transformation of the coordinate system used?

[walkamonster]

你好作者，请问您的程序在解码过程中是否将B2b钟差的基准频率B3I转换为B1I/B3I的无电离层组合？此外，与广播星历结合生成sp3文件时是否使用的坐标系的转换？即BDCS到IGS14的转换？从其他的问题中也了解到解码出的结果是以卫星天线相位为中心的，是否有开源程序能实现APC到卫星质心的转换程序？

[NavSesne]

What the software provides are the raw broadcast correction parameters.
For your own use: after computing the satellite clock from the broadcast ephemeris, you should apply the TGD/DCB correction to make it consistent with the B1I/B3I ionosphere-free combination, and then use it for clock correction in the observation model.

For the satellite orbit computed from the broadcast ephemeris, we do not perform any coordinate-frame transformation—the positions are in the same ECEF frame as the broadcast ephemeris output.

During our accuracy evaluation, we output detailed logs of the corresponding orbit and clock results, and then rewrote these logs into SP3 and CLK files. You can obtain them from the link below. If you have any questions, please contact lwzhao@nuist.edu.cn.
Files shared via Baidu Netdisk: BDS_B2b_SP3_CLK
Link: https://pan.baidu.com/s/14yh62-EAVPcddLMn9s3zQg
Access code (extraction code): gnss