Design And Realization Of LSINS Data Acquisition

INS (Inertial Navigation System) detects acceleration of moving objectives by means of inertial components, integral calculating to get parameter and deduce position of objectives. Gyro is an important part in this system, which affects the precision of navigation and position directly.Laser gyro has lots of advantages, such as rapid response speed, wide dynamic detecting range, good linearity and little dynamic error, high precision, high reliability and so on. SINS mainly composed of laser gyro and acceleration can avoid the disadvantages of general SINS, meet the requirement of wide dynamic detecting range, and improve the precision and reliability obviously, when it is applied in plane, missile and Rocket as navigation device. Some advanced countries have developed LSINS with high precision and applied it in the fields of aviation and navigation popularly, such as America, Germany, French and British. So it becomes an important system of modern planes, warships and nuclear submarines. It is very pertinent for national defence and civil purpose to develop the data acquisition of LSINS.In this paper, digital signal process is carried out to improve its performance oriented to LOG's characteristic. General procedure and method of designing LSINS with DSP and FPGA are expatiated based on the analysis of LOG principle, LSINS and DSP. In the end, software and hardware design for data acquisition are put forward. For hardware design, selecting appropriate chip and designing schematic, functions and notices of all parts are described in detail, especially for A/D and filtering technologies.For software design, programming ADS1256, DSP, ST16C550 with c and assembly, realizing FIR filtering based on DSP and developing FPGA are discussed Improving the precision and real-time of the algorithm of the SINS, This paper focuses on the software and hardware design method that the data real-time processes of the strap-down INS, using the DSP and the FPGA as the digital hardware platform. The test result demonstrates that the design method can satisfy the request of high precision, rapid speed, and high reliability of the SINS.