“…On the basis of the above, the satellite‐induced code bias can be extracted by the code bias combination model, which is expressed as follows [
32]:
where P and ϕ denote the original code and carrier phase observations, respectively; The α is the f 2 b1/ f 2 b2; f b1 and f b2 denote the frequencies of B1 and B2 bands of BDS satellite, which are 1561 and 1207 MHz, respectively; m is the multipath error of carrier phase observation and the maximum is a quarter of the wavelength. For example, the maximum carrier phase multipath of B1 frequency is only approximately 0.0475 m. However, the satellite‐induced code bias mainly fluctuates on the level of metres [
33]. Thus, the carrier phase multipath is far less than the satellite‐induced code bias, and it can be ignored in Equation (13).…”