Implementation Of Real-Time Test System For Inertial Measurement Units Based On LabVIEW

Inertial navigation technology has always been playing an important role in the modernization of national defense; furthermore, it gradually becomes essential in the national economy areas. Based on Inertial navigation technology, this thesis implements the test system for inertial measurement units of a missile. This system takes the PXI bus and FPGA devices as the hardware foundation; by using advanced virtual instruments technology, the real-time test system is developed in LabVIEW Real-Time system. It has the advantages of automation, good reliability and strong expansibility, which makes the test system has important practical application and military significance.In this thesis, first we present the overall design plan of the test system for inertial measurement units on the basis of the analysis of technical and performance requirements.Then we describe both hardware and software designs of the test system in details. In the hardware design, the PXI bus specification and the FPGA selection are discussed. The software design, as the key part of the system implementation, is divided into two parts: FPGA and LabVIEW. On the part of FPGA software design, the four modules: PXI-bus communication module, signal detection module, temperature and correction constant reading module, acceleration and angular velocity counting module are designed and implemented by VHDL. On the part of LabVIEW software design, the PXI bus driver and the serial control for power supply are designed and implemented using VISA technology; the file storage is implemented using streaming technology; the real-time capacity is achieved by using parallel VIs and shared variables in LabVIEW Real-Time system.The test results and performences show that this system meets the technical and performance requirements, and it can accomplish the accurate pulse counting of 12 channels in 1.25ms(4ms). The implemented system is convenient to use, maintain, and expand.