Since the bandwidth of modernized navigation signal is increasing, the advantages of complex signal sampling have a raising benefit by substantially reducing the sampling rate. Because of the I/Q amplitude and phase response imbalance, the complex signal sampling may introduce error to the pseudo range measurement in the navigation receivers. The analysis model explaining the influence of the non-ideal characteristic of signal channel, I/Q amplitude and phase response imbalance on the zero value measurement in BPSK/QPSK navigation receivers were improved. Based on the model, the pseudo range zero value of BOC signal affected by I/Q imbalance and the nonideal characteristic of signal channel was derived. The zero value shift caused by the two factors in the frequency domain anti-jamming processing was discussed. The proposed theoretical analysis is highly close to the simulation result in software receivers, where the error is within 1.5×10^-4 chip. This result proves the accuracy of the analysis model. The proposed analysis method can be used to provide prior constraint for features of analog channel in high performance navigation receivers, which can meet the requirement of the zero value change in the jamming scenario.