Design Of Strapdown Inertial Navigation System Based On DSP/FPGA

In the inertial navigation system (INS), strapdown inertial navigation system (SINS) is gradually replacing the platform inertial navigation system for its small size, low cost and high reliability, and becomes the development trend of INS.To meet miniaturization, low cost and high-performance development direction of SINS, this paper designs a system scheme in which DSP combines with FPGA: MEMS devices and high-performance A/D converter construct the inertial signal detection unit, FPGA accomplishes I/O control, DSP completes navigation solution. The design comprehensively considers the system cost, computing speed, accuracy, size etc, and improves the navigation accuracy further by the information fusion of GPS and magnetic heading.Data acquisition is the key of the SINS design. In this paper, the data acquisition is composed of signal conditioning, A/D conversion, FPGA and so on. Where, FPGA is the core part of the entire data collection, its main functions include: achieves the ADC control logic and timing generation, configures the FIFO register to buffer the conversion data between ADC and DSP, extends UART serial port in order to achieve the external information interface of system. On the basis of completing the system circuit design, this paper carries out comprehensive semi-physical simulation, verifies the feasibility of system scheme and main function modules.This paper describes briefly the application and development of INS, introduces the basic principles of SINS, designs a strapdown inertial navigation system solution based on DSP / FPGA, implements the hardware circuits and FPGA functional blocks of the system, and makes comprehensive verification and simulation to the performance of the sensor as well as FPGA functional modules through building the hardware verification platforms and using third-party simulation software. The results showed that: the strapdown inertial navigation system based on DSP / FPGA can meet the application requirements, and has certain advantages on the small size, low cost and high-performance.