The Unet simulator supports various ways of simulating the motion of the simulated nodes, from simple dynamics models to completely custom functions that can generate motion updates. Let’s look at how one can go about simulating the motion of nodes in the Unet Simulator.

Acoustic modems transmit physical sound waves via a transducer, typically a piezoelectric device. Such sound emitters have an ideal resonance frequency F and a Q factor of the order of 0.3. This means that the efficient region of the frequencies it can transmit centers around the resonance frequency with a bandwidth of about 0.3 x F. Q may be higher or lower depending on the exact transducer.

It is April again, and that means it is time for the next release of UnetStack! We are excited to bring several new features to you – a new JSON event logging framework for automated analysis of multi-agent protocols, support for signal strength and ambient noise level reporting in the Unet simulator, and experimental support for Julia agents! In addition, UnetStack 3.3 also incorporates numerous enhancements, bug fixes and performance improvements.

Imagine you are developing an application for an underwater use case such as messaging or file transfer and you intend to eventually deploy the app on a network of JANUS compliant modems in the field. Or you may be developing a new routing protocol that is intended to work on a network of JANUS compliant modems. Or you might be a university Professor designing an exercise for your students to learn about underwater communications and networking.

In my previous article on developing your own acoustic PHY, I showed you how to develop your own acoustic PHY in Groovy or Java. However, Groovy and Java are not well suited to writing complex mathematical algorithms. Wouldn’t it be nice if we could write the algorithms in Julia instead? In this article, we take the custom PHY we developed previously, and replace the signal processing methods with the Julia equivalents. The technique applies not just to PHY agents, and so this article should get you started on leveraging Julia in any UnetStack agents (or for that matter in any Java or Groovy code).