Design Of The Integrated Gyroscope Pulse Output Testing System

Integrated Gyroscope, an aggregation of single Gyroscopes with features of small volume, strong anti-interference performance, excellent linearity and high measuring accuracy, is able to measure variable quantities of angular velocity in3Degrees of freedom and6directions on space coordinates at one time, which can be widely used in Navigation and localization. The Pulse output performance testing before use is an significant way to judge characteristics of Gyroscope.This paper presents a Integrated Gyroscope pulse testing system scheme based on FPGA and USB2.0communication, aiming to improve the shortness existing in current Integrated Gyroscope Pulse Output Testing System such as narrow pulse frequency band range, low measuring accuracy, inefficient data transmission and high equipment cost. The scheme uses HDL as the description language for each functional module and implemented by FPGA after synthesize. In terms of Pulse counting, a32bit width counter latch is used to achieve synchronous seamless counting for multiplex input pulse with latched transmission of counting data per1.25ms, which expand the testing frequency band range in pulse testing system, therefore testing data overflow can be taken no consideration of. Then date will be transferred to host computer in real-time by the combination of USB2.0interface chip and control module in FPGA. For the ordinary architecture PC development USB device driver after the driver installation is complete, the device can power on the bootstrap, plug and play, easy to use. Application programs of host computer developed in VC++6.0environment as the User Interface for real-time data processing, displaying and storing, and the programs in host computer can also be modified according to the actual demand to meet the pulse testing needs in other fields. In terms of testing accuracy, normal accuracy crystal oscillator is combined with software compensation method to modify testing results for improving testing accuracy, which lower the cost by avoiding to use military-level crystal oscillator for certain accuracy among same type devices. Subordinate computers in pulse testing system can also be powered by host computer through USB bus interface, no longer needing external power, the device connection is convenient and easy to carry.The testing system designed in this paper can test6pulses outputted by Integrated Gyroscope with testing accuracy of1×10-6within high frequency range, which can meet actual testing needs.