Hardware Design Of Beidou Double Antenna Transceiver System

Beidou satellite navigation is a global satellite navigation and communication system developed by China,Establishment and use of the Beidou satellite navigation system has got rid of China's dependence on GPS positioning and broke the monopoly of satellite navigation and positioning technology in developed countries.It is of great significance to China.The Beidou navigation terminal is an important part of the development of the Beidou satellite navigation system.The Beidou transceiver module can send and receive information from the Beidou satellite navigation system and complete the filtering,demodulation,modulation and signal amplification of the Beidou signal.Making communication and location information available to users is an important part of user equipment.Based on the specific requirements of design and development,the system integrates RDSS communication positioning function,RNSS positioning function,and is compatible with passive antenna and active antenna,and can achieve the same communication positioning function under any antenna mode.The system hardware design mainly by consist of low noise amplifier circuit,signal transceiver circuit,base band signal processing circuit,power amplifier circuit,switch circuit,etc...Combining active and passive antennas to form a complete transceiver system.The hardware is designed to support both passive and active antenna,passive antenna and active antenna receiving antenna transmitting Shared frequency conversion circuit and base-band signal processing circuit,the hardware design using RF switch,diplexer,power divider and so on.Realization of RF signal switching and in order to meet under the condition of using different antenna to realize communication positioning function satisfy the design index first need good RF switch logic control,to ensure the correctness of the gated signal;Secondly,in the case of selecting one antenna,the interference of receiving signals of another antenna needs to be done well.The hardware design can be realized by controlling the corresponding power supply to ensure sufficiently isolation degree.This design is a customized product of a research institute in Beijing.It aims to carry out platform management of transportation vehicles through the positioning communication function of this product.Through the single board debugging,testing and verification of the entire product,to meet the requirements of the design specifications,has obtained the user's approval and used in bulk.