Performance and Design of Carrier Tracking Loop Based on Atan Detector in GNSS Receiver

This paper gives the bandwidth under different signal to noise ratios by precisely analyzing the atan phase detector, proved the result by simulation. It is concluded that the bandwidth of the loop under very low signal to noise ratio is triplicate of the bandwidth in high signal to noise ratio, which will make the error caused by short-term stability of the oscillator and the acceleration of Doppler. The signal to noise ratio decreases 10 dB, the thermal phase noise will increase 20 dB. Finally, for the purpose of steady tracking, the threshold of signal to noise ratio and the loop filters coefficients are given. The results of this article can be used to guide the design of the satellite navigation receiver.