Beidou third-generation satellite signal simulation system and analog signal generation method

Abstract

The invention discloses a beidou third-generation satellite signal simulation system and an analog signal generation method. Real-time information interaction between an upper computer and an FPGA iscompleted through an RS232 serial port, the upper computer sends data defined by a user to the FPGA, and meanwhile, the FPGA transmits the information stored by the FPGA back to the upper computer fordisplaying. Real-time information interaction between the FPGA and a DSP is completed through an EMIF address line, when interrupt arrives, the DSP transmits calculated various parameters to the FPGA, and meanwhile, the FPGA transmits stored specific data back to the DSP for checking. Then, a generated signal is transmitted by the FPGA to an up-conversion module after passing through a DA conversion module, and finally is emitted by a transmitting antenna or a radio-frequency cable out. A program module sharing method is adopted, and a baseband board completes processing of baseband signals in a DSP + FPGA combination mode, so that the research and development period is effectively shortened, the hardware cost of a simulator is reduced, and the test environment is convenient to construct.

Description

technical field [0001] The invention relates to satellite navigation and positioning technology, in particular to a Beidou three-generation satellite signal simulation system and a simulation signal generation method. Background technique [0002] GNSS (Global Navigation Satellite System) is a general term for satellite navigation systems, including GPS in the United States, GLONASS in Russia, BDS in China, and Galileo in the European Union. So far, there are only two global navigation and positioning systems that can achieve global coverage, one is the GPS global satellite positioning system of the United States, and the other is the GLONASS system of Russia. At present, the establishment of the second-generation Beidou satellite navigation system is not perfect enough to achieve global coverage, and the service area is limited to the Asia-Pacific region. In order to make the Beidou satellite navigation system better serve the world, my country will eventually launch 35 Be...

AI Technical Summary

Problems solved by technology

[0003] The frequency of the Beidou third-generation satellite signal simulator BIC is adjusted to 1575.42MHz, the signal is added with BOC modulation, and the code rate and message format have been greatly adjusted. At the same time, it involves a lot of sophisticated technologies, and the technology is very difficult.

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