Sediment echosounder raw data (Atlas Parasound P70 echosounder working area dataset) of RV METEOR cruise M74/4, Maldivian carbonate platform@en

Parasound profiles are acquired witth the hull mounted echosounder device P70 (Atlas Elektronik GmbH), witch uses the parametric effect in which a secondary low-frequency signal is generated from the emission of two high-frequency primary signals. The simultaneously emitted frequencies were 18 kHz and 22 kHz, which constructively interfere resulting in a narrow beam cone of 4°.参数声剖面（Parasound profiles）由船载回声测深仪设备P70（阿特拉斯电子有限公司，Atlas Elektronik GmbH）采集获取，该设备利用参量效应，即通过发射两路高频原始信号生成次级低频信号。同时发射的频率为18 kHz与22 kHz，二者经相长干涉后形成夹角为4°的窄波束锥。