GNSS receivers are required to be capable of receiving weak signals to satisfy indoor Applications.When detecting weak signals

the receiver may falsely acquire or track the cross correlation peaks of strong signals due to the cross correlation interference.Coherent and non-coherent integration are combined to improve the reception sensitivity.Meanwhile

the detection threshold is adjusted automatically by estimating the cross correlation interference power from strong signals to mitigating cross correlation interference.Simulation results show that the receiver can detect weak signal of -160dBm for 20ms coherent and 1s non-coherent integration without the interference of cross correlation.As the power of cross correlation interference increases

the resultant false alarm probability is maintained below the present value by automatically increasing the detection threshold.