Implementation Of Strapdown Inertial Navigation System Based On The Architecture Of DSP/FPGA

With the further development of inertial technology, strapdown inertial navigation system (SINS) becomes a major trend of inertial navigation system (INS) because it has the characteristics of small size, low cost and excellent performance. The design based on the architecture of DSP/FPGA is proposed and implemented in this paper.Firstly, the design based on the architecture of DSP/FPGA is introduced and the principle of INS is described. The circuit which is composed of inertial signal detection circuit, inertial signal acquisition circuit, digital signal processor (DSP), field programmable gate array (FPGA) and external power supply circuit is introduced and ayalyzed in the paper.Secondly, the core functional units of navigation system is developed based on the design of the system and it is constituted the hardware platform of SINS with inertial data acquisition device, PC and power device. In the navigation system, high-speed DSP completes navigation solution and logic control. What's more, as DSP's auxiliary equipment, FPGA is responsible for expanding interface, cushioning data and implementing the function of ADC. Hence the feasibility of the design can be verified by testing the functions of data collection and data communication of navigation system.Then, the reason for producing the error is analyzed by observing the results of inertial signal acquisition. An design for acceleration signal acquisition is proposed to highly improve the accuracy of the whole system, to increase the processing speed and to reduce the interference.Finally, based on the principle of 1553B bus,1553B bus protocol is designed and implemented with the remaining resources of DSP and FPGA. On one hand, FPGA is used to design and implement 1553B bus controller and remote terminals; on the other hand, DSP is responsible for words and messages processing. Then the basic communication between bus controller and remote terminal is tested by using the hardware platform. And the accuracy of the data transmitted on the bus is verified by observing the input and output waveform of the oscilloscope. Therefore, the design can provide a reliable, high-speed data communication capabilities for the system.The function of data acquisition and data communication in navigation system based on the architecture of DSP/FPGA is designed in this paper. The hardware platform is built to verify the feasibility of the design by testing each function module. The result shows that the design based on the architecture of DSP/FPGA not only meets the basic requirements of SINS, but also is valuable in practise.