The effect of satellite code bias on GPS PPP time transfer

ABSTRACT

Time transfer technology using PPP relies onhigh-precision clockproducts of GPS satellites. When the observation we use is different that of the clock products, a SCB will be incorporated into the calculation of clock.For analyze the effect of SCB, we first derive the principles of correcting SCB. Thenthe effect of SCB on GPS PPP time transfer under three different conditionsis analyzed. The results indicate that the SCB can significantly improve the frequency stability, precision and PPP time transfer convergence speed.The precision of time transfer is improved by approximately 7% and the 5000s-200000s frequency stabilityis improved significantly, up to 20%.

KEYWORDS:

• GPS
• precise point positioning
• satellite code bias
• differential code bias
• Time transfer

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

In this paper, we use IGS station observations provided by IGS, the broadcast ephemeris provided by CDDIS (https://cddis.nasa.gov/archive/gps/data/daily/), the precise orbit and clock product pro-vided by IGS (https://cddis.nasa.gov/archive/gps/products/), the DCB products provided by CAS and DLR (https://cddis.nasa.gov/archive/gps/products/mgex/dcb/) and CODE(ftp.aiub.unibe.ch/CODE/2019/).

Additional information

Funding

This work was supported by National Natural Science Foundations of China [42174222]; Knowledge Innovation Program of Wuhan-Shuguang Project [2023010201010082]; the Open Fund of Hubei Luojia Laboratory [220100062].