Assessment and research on the Self-Interference of GPS weak signal acquisition in indoor location environment

In GPS signal indoor positioning system, the signal intensity received by the different channels of receiver are diverse when GPS signal penetrate buildings. In the process of weak signal acquisition, the cross correlation interference between the strong and weak signal will lead to the decrease of the signal to noise ratio of weak signal. However, it is difficult to assess the attenuation degree. According to the crosscorrelation between characteristics of GPS satellite signals, the equivalent carrier to noise ratio analysis method based on the spectral separation coefficient is proposed, The attenuation degree of signal carrier to noise ratio caused by the strong interferential signals with the changing Doppler shift is derived, which provides theoretical basis for assessing the influence of strong interferential signal on weak signal. Analysis of theoretical value and simulation results verify the accuracy of the proposed method.