For different signal structures

the degradation of tracking performance caused by CWI (continuous wave interference) is different.The traditional analyses and the corresponding results are obtained with the assumption that the CWI complies with the Gaussian distribution and the effect of PRN (Pseudo-Random Noise) on performance is ignored.With the consideration of the effect of discrete spectrum line of PRN code

the expression of the maximum code tracking error of the non-coherent early-minus-late power discriminator for infinite front-end bandwidth case under CWI is provided and the validation of the expression by computer simulation is performed.The maximum tracking error

average tracking error

and relative tracking error are used to evaluate the anti CWI performance of the GNSS (global navigation satellite system) signal.The comparison of the tracking performance between the coherent early-minus-late and the non-coherent early-minus-late power discriminators under CWI shows that their performance difference is obvious under low signal-to-interference ratio and the performance difference depends on the modulation types.At last

the evaluation of the anti CWI performance among all GPS C/A codes and the comparison of the performance among BPSK(1)

BOC(1

1)

and MBOC(6

1

1/11) under CWI are performed

respectively.