We have been involved in aircraft noise measurement in the field and product development for unattended monitoring. We have been proposing a monitoring system by integrating a wide range of original technologies, such as an aircraft noise discriminator, flight path monitoring device, up-to-date aircraft noise source discriminator and automated measurement system for takeoff/landing time and for runways. In addition, we have been offering a variety of services such as maintenance support, measurement of aircraft noise or flight paths, and making noise contour using our simulation technology.