高精度A/D转换技术在惯导系统中的应用研究

Research on High Accuracy Analog-to-digital Convert for Inertial Navigation Systems

关键词:  高精度A/D转换  零位  采样率

Key words:  High accuracy analog-to-digital convert  Zero  Sampling rate

摘要:

针对惯导系统对模数转换电路的使用要求，明确了制约A/D转换电路在惯导系统中应用的瓶颈是零位稳定性，分析了A/D转换电路零位的影响因素，提出了解决方法。并设计出一款A/D转换电路，该电路的测试结果表明解决方法有效，可将零位提高2个数量级，与传统V/F转换电路相当。证明采用A/D转换芯片的模数转换电路能够满足惯导系统的精度要求，同时相比V/F、I/F具有高采样率和高分辨率的优势，技术指标可以满足高精度加速度测量系统等实际工程需求。

Abstract:

This article found that the zero stability is the bottleneck of application of analog-to-digital convert circuits on inertial navigation systems based on application requirements, analyzed the influencing factors of the zero stability, then proposed solutions.Designed an analog-to-digital convert circuit whose test results prove the solutions,the zero turns out two orders of magnitude higher than old designs,and is as good as traditional V/F convert circuits.This result shows that analog-to-digital convert circuits which use analog-to-digital converters can satisfy the accuracy requirements of inertial navigation systems,and it has advantages than V/F、I/F convert circuits on high sampling rate and high resolution,technical indicators can fulfil systems which need high accuracy acceleration measurements.