Ranging Bias of COMPASS Satellite Signals

摘要

Quantitative evaluation of signal quality of navigation satellites in orbit is one of the difficulties in satellite navigation signal quality monitoring research, so a quantitative evaluation method based on theoretic ranging bias is proposed. Based on Vernier sampling principle and a large diameter parabolic antenna is used for in-orbit satellite signal collection, and a clear waveform of code epoch is achieved after data processing. Based on the clear waveform, it's starting point is estimated, and leading signal and delay signal are produced, then the E-L discriminator curve is got, finally zero crossing bias is achieved, which is the ranging bias of the signal. A large diameter parabolic antenna is used for COMPASS satellite tracking, and signal collection and data processing is made, then theoretic ranging bias of I channel at B1 band of several COMPASS satellites are obtained, so the estimation method is verified.