The System for Keeping Records of Radio and TV Receivers based on the Java J2ME Platform

摘要

The core of a basic system for monitoring unknown frequency signals is a group of aerials for the entire frequency spectrum to be monitored, which is connected to a receiver or spectrum analyzer with an aerial switcher selector. The entire hardware is controlled by a system controller (PC or laptop), with a software for monitoring station signals. Measuring stations can be fixed, portable and mobile. Flexibility of the monitoring software provides that mobile or portable systems are equipped with the same software as fixed stations. A mobile station for monitoring signals is mostly used for locating fixed receivers or, more precisely, for guidance (detection of mobile transmitters). These stations are used in case that the receiving range of a fixed monitoring station is not adequate for the target transmitters, or in case that large areas cannot be covered with sufficient number of fixed monitoring stations due to high costs.