Yes, you could do so by navigating to your StationWare installation directory and replace the logo.svg file located inside WebImpl.HtmlUI/psms/Images.

There you will also find the StationWare logo that is used inside of the user interface. The StationWare logo can also be replaced with an user defined scalable vector graphic file.

In case that your browser does not automatically recognize the changes you have to delete the browser cache.