The effect of satellite code bias on GPS PPP time transfer

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%.