关键词: 多通道, 导航, 高隔离度

Abstract: In this paper,a multi-channel transmitting and receiving module used in BeiDou and GLONASS navigation system is designed and implemented.The module is consisted by four down converter receiving channels and two up converter transmitting channels.The receiving channels receive BD and GLONASS signals at same time,and output the high isolated navigation signals for both modes by filtering,mixing,amplifying,and limiting.The up converter channels convert two IF signals to BD and GLONASS frequencies,and output at same port.The isolation index of each channels achieves 70 dB,and at-5 dBm output power,the third-order intermodulation is above -60 dBc, which shows the good linearity index of thismodule.

Key words: multi-channel, navigation, high-isolation