We chose Songhua river as our testing place. As our first outdoor test, we experienced many difficulties. In the end, we found some fatal problems. So we came back and fix them.
We discuss the rules with the organizers and it is really helpful. It is a pity that we do not speak English fluently, and I am really sure we will be much better next time!
Now the whole project has been restarted. The hydrophone equipments has been bought, and we are going to finish the LIDAR system procurement soon.