Synthesis of real world drone signals based on lab recordings
Synthesis of real world drone signals based on lab recordings
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DOI：
10.1051/aacus/2020023
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发表时间：
2020-11-11
期刊：
影响因子：
1.4
通讯作者：
Wellig, Peter
中科院分区：
文献类型：
--
作者：
Heutschi, Kurt;Ott, Beat;Wellig, Peter
在各种应用中，例如为了可听化目的或为检测算法汇编训练数据，产生合理的无人机信号引起了极大的兴趣。在这里，提出了一种基于实验室记录和后续信号处理来合成真实发射信号的方法。将实验室无人机信号转换为虚拟场麦克风信号必须考虑恒定的音调漂移以适应操纵特定转速和相应的频率相关发射强度校正、随机音调漂移变化以考虑场中湍流引起的转速变化、多普勒频移以及根据不同的传播效应进行的时间和频率相关的幅度调整。通过室内和现场测量评价，确定了相应的合成器参数。研究发现，对于所研究的一组无人机类型，垂直辐射特性可以成功地用一般的频率相关指向性模式来描述。该方法被应用于不同型号的无人机，总重量在800克到3.4公斤之间，并通过对比实验室和现场的记录，讨论了它的能力和局限性。
There is a great interest in the generation of plausible drone signals in various applications, e.g. for auralization purposes or the compilation of training data for detection algorithms. Here, a methodology is presented which synthesises realistic immission signals based on laboratory recordings and subsequent signal processing. The transformation of a lab drone signal into a virtual field microphone signal has to consider a constant pitch shift to adjust for the manoeuvre specific rotational speed and the corresponding frequency dependent emission strength correction, a random pitch shift variation to account for turbulence induced rotational speed variations in the field, Doppler frequency shift and time and frequency dependent amplitude adjustments according to the different propagation effects. By evaluation of lab and field measurements, the relevant synthesizer parameters were determined. It was found that for the investigated set of drone types, the vertical radiation characteristics can be successfully described by a generic frequency dependent directivity pattern. The proposed method is applied to different drone models with a total weight between 800 g and 3.4 kg and is discussed with respect to its abilities and limitations comparing both, recordings taken in the lab and the field.