Launching Vehicle Acoustic Data Compression Study Using Lossy Audio Formats

ABSTRACT: The field of data compression has evolved over the last decades. In this way, several techniques to reduce the amount of acquired data from the sensor required to be transmitted have been developed. Those techniques are usually classified by lossless or lossy, where, for the lossless techniques, all acquired data is recovered, while the lossy techniques introduce errors to these data. Each of these techniques presents advantages and drawbacks, being the analyst responsible for choosing the appropriate technique for a specific application. This work presents a comparative study using lossy audio formats to be applied on a launch vehicle on-board acoustic data. The Opus format achieved a higher compression rate in comparison with standard compression techniques by saving up to 254 times the required amount of data to be transmitted through a telemetry link on launcher vehicle, and the lowest discrepancy from original data measured by the mean square error metric.摘要：数据压缩领域在过去数十年间经历了显著发展。为此，诸多用于缩减传感器采集所得待传输数据量的技术被相继研发。此类技术通常按无损与有损两类划分：无损技术可完整恢复全部采集数据，而有损技术则会向数据引入误差。两类技术各有优劣，分析师需根据具体应用场景选择合适的技术方案。本研究针对运载火箭机载声学数据，开展了基于有损音频格式的对比研究。相较于标准压缩技术，Opus格式可实现更高压缩率，在运载器遥测链路传输场景中，最多可将待传输数据量缩减至原有的1/254，且基于均方误差（mean square error）指标衡量的与原始数据的偏差最低。