The issue about Mobile Location Systems have been studied for a long time.At first, it was circumscribed to the militar area, but nowadays it has been spread along civil society needs. Due to the boom of the cellular mobile technology, location system may become necessary for the cellular mobile company. Location based services may vary. However, the emergency calls service have been discussed by international companies. This has happened because, last decade, the United States has obliged the wireless carriers to locate accurately emergency calls accurately, called E911. But, for this do happen, there are several ways and techniques to get accuracy location,among which we can highlight time diference of arrival -TDOA-. These techniques are based on hiperbolic equations solutions that offer the location of a mobile. This is why the systems based on TDOA are called Hiperbolic Systems. This dissertation has tried develop new analysis for the hiperbolic system of location. This dissertation is marked by optimization of the TDOA measures, which may offer accuracy location of the station mobile.