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

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。

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 resolu- tion, technical indicators can fulfil systems which need high accuracy acceleration measurements.