Research On Computer Detection Technology For Inertial Navigation Components

This paper designs the detection system which using MCU and FPGA as the core, it is used to real-time data acquisition and processing inertial components outputs pulse, using a serial port with controlling computer for data transmission, use VHDL language to design internal circuit for FPGA,With programming flexible,high-speed wide frequency measurement and stability good characteristic.This paper introduces the ALTERA company FLEX 1 OK series FPGA device and the ATMEL company Atmega128 MCU, as well as introduces the MCU internal US ART bus protocols and communication mode, Then explores this design scheme which contains hardware and software design contents.the hardware circuit is introduced, the logic control module and pulse counter module are designed in FPGA.the program of the AVR is designed,the interface of the control computer and the storage are designed,and the accuracy of test data is analyzed and summed up in this paper.Hardware circuit design focuses on MCU and FPGA interface design, power modules, FPGA internal counting and logic control unit design, the interface design between MCU and controlling computer. Altera's FPGA chip EPF10K20TC144-4 is selected as the core of pulse count devices to collect the inertial components outputs pulse; AVR Atmega128-16AU MCU is adoptted as the master chip for data processing and transmission. Maxim's MAX series chip MAX232 is used as the control chip between MCU and controlling computer. In software programming aspect, VHDL language in MAXPLUSII platform and C language are respective applied to FPGA and MCU for programming; VC++6.0 is used to design monitor and control computer applications program.The designed detection system can be able to achieve a dynamic test the output pulse with 12 channals of the inertial navigation components, frequency measure of the scope reaches lHz～1.6MHz, measurement error is less than 10-4.Meet the dynamic test requirements.