Abstract: Once the Beidou satellite receiving signal is interfered, its receiving performance will be greatly affected, even make it unable to astare signal. Based on equivalent carrier-to-noise ratio, a evaluation method of the signal reception performance of Beidou is presented, the influence of interference on reception performance of Beidou signal is studied, the relation between relevant evaluation parameters and the equivalent carrier-to-noise ratio and its calculation method are analyzed. Finally, through Matlab simulation, relation among the signal reception performance, the equivalent carrier-to-noise ratio and the pre-detection integration time are obtained. Comparison
results show that the greater the interference power is, the closer the center frequency of interference is to the center of the signal band, the smaller the equivalent carrier-to-noise ratio becomes, the poorer the signal is reception performance; under the same interference conditions, increasing the pre-detection integration time of the carrier tracking loop can reduce the influence of interference on the signal reception performance of Beidou.

Key words: BeiDou signal, signal interference, equivalent carrier-to-noise ratio, pre-detection integration time, reception
performance