This project studies the usefulness of GPS technology for the development of personal location applications. It is focused on the system and technical features study. On the other hand, it proposes how to improve current system applications trying to enhance its overall performance. From a technical point of view, it shows the signal features of the system, like the wave form or the modulation, together with the required system extra devices, access protocols and implementation issues. Moreover, computer simulations of representative scenarios have been carried out in order to assess the potential achievable benefits. The parts of this project are, first of all, the study of the system itself (understanding the current state of the art, all its features and protocols), the proposal of some improvements (based on the system study) and the implementation of computer simulation to validate this improvements.

The final work that is shown below has such a final purpose to offer a system, that could be easily implemented, for kids location using a GPS locator and a GPRS device cell phone device. This sort of devices are currently in a good moment to be sold. This document shows the current situation of these devices and the demand and offer of these products (in Spain). It also shows the GPRS coverage map in Spain because this system tought, mainly, to be implemented in Spain. Although currently, as has been said before, these kind of devices already exist, in this document the technical specifications explained are only thought for the system explained in this document and they differ from the other specifications from the other similar products/systems. This document offers the necessary information and specifications to enable the system creation and production. Using the created program for this final work, we can obtain information about the utility that this system can offer depending on the kid ususal environment. The program, created in JAVA language and using the Netbeans platform (explained below in this document), allows to create any scenario showing the GPRS communication quality whenever the communication can be possible and this is how the program shows the utility of the system for the kid environment. Finally, in the end of this document, are shown the difficulties that have been appearing during the creation of this final work and the job done every month to create this system that allows to locate kids ans its simulation program.