Aiming at the difficulties of complex design of traditional pseudo-satellite hardware circuits and data redundancy and asynchrony in the process of navigation message transmission

a design method for pseudo-satellite baseband signal based on field programmable gate array（FPGA）+ advanced RISC machine(ARM)architecture is proposed.The design method includes a preprocessing module for message communication

an asynchronous first-in first-out(FIFO)queue module and a signal generation module.Firstly

functional simulation verification and analysis of each module are carried out.Then

the carrier

message

clock

and coarse/acquisition(C/A) code are tested and verified by using equipment such as an oscilloscope

a spectrum analyzer.Experimental results show that the carrier signal generated by this method is stable at 20.4529MHz

the carrier quality is stable

the transmission data of the message communication is accurate and non-redundant

and the C/A code and each clock source signal of the system are stable.The accuracy of the carrier center frequency test reaches 99.96%

and the design achieves the expected effect.