Exclusion of Spacecraft Internal Multipath among Pseudorange Variation Reasons

For the code pseudorange variations in the satellite's visible range, ranging bias variation of navigation signal is studied from the point of view of signal quality monitoring, and it's consistency with the code pseudorange variations is confirmed. By using of large antenna to track COMPASS satellite, multiple high CNR B1 signal are collected by two data acquisition platforms. The collected data are processed separately according to ranging bias estimation method based on reference waveform, and ranging biases in different elevation angles are obtained. For one elevation angle, when filter bandwidth is much larger than signal bandwidth, the ranging biases are same for the two data acquisition platforms with different sampling rate and down converter. The ranging biases are both related with correlator spacing and filter bandwidth. However, the difference of ranging bias can be omitted when filter bandwidth is larger than 15MHz. Furthermore, ranging biases of different elevation angle is compared, and the results show that the difference of ranging biases is tiny. Therefore, signal quality changes in satellite's visible range induced by spacecraft internal multipath is excluded from pseudorange variations.